Date   

Re: 600 WSJS Winston-Salem NC heard at Noordhoek, South Africa

bbwrwy
 

Gary:

Congrats on hearing WSJS in South Africa. I doubt it will be heard here. The frequency is too crowded; however, two days ago I logged CJWW, Saskatoon, Saskatchewan, 600 kHz, for the first time.

Good DX.

Richard.

Richard Allen
36°22'51"N / 97°26'35"W
[near Perry OK USA]
Sony SRF-T615, Tecsun PL-310 & PL-380


possible dx test

Carl DeWhitt
 

This was posted on the IRCA mail list.I am forwarding it along for those who may want to try for it.If i can wake up for this or stay awake for it,it would be a great ulr catch here.
Carl DeWhitt
Maryville,Tn.


Message: 8
Date: Tue, 12 Jan 2010 20:49:48 -0800
From: mwdxer@... (Patrick Martin)
To: irca@...
Subject: Re: [IRCA] 1210 test
Message-ID: <11312-4B4D50EC-814@...>
Content-Type: Text/Plain; Charset=ISO-8859-1

Looks like KEVT-1210 will be testing early on Thursday morning with 10
kw non-directional starting at about 12:30 a.m.? Pacific time or 1:30
a.m. Mountain Time.? Programming is mostly Mexican Music but there
could be some English IDs.??? You might pass this on to anyone who
might be interested

Paul Losoff
Tucson AZ

* I don't know anymore about this, as Pul just sent the e mail.

Patrick Martin
KGED QSL Manager
From Carl:
Wikipedia has the following KEVT information:

KEVT Sahuarita, Arizona 1210 Slogan La Raza 1210 AM 10k/1k
format:Regional Mexican


Re: Tecsun PL-310/380 Inductive Coupling to External Anten...

Gary DeBock
 

Hi Kevin,
 
Thanks for the interesting question about the performance of stock and modified Ultralight radios with large loops.
 
Many DXers have been puzzled why their sensitive AM portables (like the Sony ICF-S5W, ICF-EX5 or Panasonic RF-2200) don't receive much of a signal boost from their smaller tuned passive loops (Select-a-Tenna, Terk Advantage, Q-stick etc.) while their smaller Ultralight radios (like the SRF-59, DT-400W etc.) get a very serious signal enhancement from the same external antennas. Probably the best explanation is that the external loop's weak-signal reception capability must be much greater than that of the portable's stock loopstick, in order to make much of a difference in DXing performance.
 
The 7.5" loopstick-modified Ultralights ( "Amidon PL-380," Slider E100, Slider SWP, etc.) behave exactly like the most sensitive AM portables in this regard, receiving almost no signal boost from the smaller tuned passive loops. The stand-alone DXing performance of these modified Ultralights often equals or exceeds that of the stock model inductively coupled to the same loops, so that's probably no big surprise.
 
The DXing performance difference between stock and modified Ultralights (and the very sensitive AM portables) disappears as the loops get larger, however. From my experience, the tuned passive loops about 6' and larger (per side) provide the same huge signal enhancement to any portable brought within inductive coupling range, whether it is a stock PL-380, Amidon PL-380, ICF-S5W or even the 30" loopstick ICF-2010. All of these portables simply get "swamped" by the RF boost provided by the large loops, so there really is no difference in the strength of the DX signal received (although there is a big difference in how well the portables can handle the massive RF, depending upon their selectivity, and "crunch resistance").
 
After discovering this fact, I had a blast using one of the smallest Ultralights on the planet (the lighter-sized Sony SRF-S84) inductively coupled to the 9' PVC loop, and discovering it could easily receive multiple exotic TP's (as soon as I could figure out what frequency I was on :-)
 
73, Gary       
 
      
 

In a message dated 1/13/2010 7:00:04 A.M. Pacific Standard Time, satya@... writes:
 

Hi Gary/all:

Thanks for giving us the blow-by-blow on this! This is a good guide to the procedure.

This is similar to what I did when I was out at the beach with my little active-passive loop, the tuning of which is very precise and so it's easy to miss where I am actually trying to be. Using the Sony 7600GR and its fairly useless tuning LCD indicator as a spotter, I would set it to SSB in order to get a het on a TP/TA, then tune the loop aurally to the het - this actually works pretty well since the het really jumps out, and is about as tough to miss as the Christmas tree lights on the 2010 :-). I would then do as Gary suggests - move the spotter aside and put the Ultralight in its place (or simply retune the Ultralight if coupling it to the loop with a little ferrite coupler, which is more convenient and provides better signal transfer).

Gary - with a large loop, do you notice any difference in the resultant signal strength between a stock PL-380 and an Amidon PL-380? It seems that if the loop is big enough, it would more or less completely dictate the signal level, making the stock PL-380 viable as a TA/TP receiver if one has a big loop in the mix.

Kevin S
Bainbridge Island, WA

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hello All,
>
> Ralph Pollock asked a very interesting question about peaking external
> antennas for use with the Tecsun DSP models-- a subject which has also
> interested me from the beginning, due to my use of the radios with large tuned
> passive loops during DXpeditions. The correspondence below may be of interest
> to those with similar questions.
>
> 73, Gary
>
> From: d1028gary@... ..>
> To: Pollock,Raphael E
> Sent: Tue Jan 12 20:10:10 2010
> Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models
>
> Hello Ralph,
>
> Thanks for your comments on the PL-310/380 experimentation, which are
> appreciated.
>
> Since these Tecsun DSP models have a somewhat delayed response to sudden
> boosts in RF signal power from external antennnas, they typically don't have
> the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6
> when external antennas are peaked on their tuned frequency. The digital
> signal strength readings on the PL-310/380 displays are also of little help,
> since both models use an averaging system which causes a delay in changes
> to the digital display reading. For this reason, even I have found it
> counter-productive to try peaking external antennas by listening to the
> PL-310/380 audio, or watching the RSSI or S/N readings change on the digital
> display.
>
> After receiving your email, I did attempt to use a Q-stick+ for peaking a
> PL-380, and while inconvenient, it did provide a significant signal boost
> according to the S/N digital display reading (after a wait of about 5
> seconds). The problem is that the PL-380 has no immediate response (either audio
> or visual) to the peaking of the external Q-stick on its tuned frequency,
> making it tough to determine when you have hit the peak. You need to wait
> about 5 seconds to find out.
>
> After developing a series of huge loop antennas (with the related
> technical article linked at _http://www.mediafire.com/?igw1zjwfzmw_
> (http://www.mediafire.com/?igw1zjwfzmw) ) and using them exclusively during DXpeditions
> with the Tecsun models, I have found that the best way to adjust these
> monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's
> red LED display to peak the loops, then simply bring the PL-310/380's into
> the inductive coupling field of the loops. The ICF-2010 is ideal for this
> purpose, especially on dark ocean beaches where the LED signal strength
> display will light up like a Christmas tree when the loops are matched in
> frequency.
>
> For the external antenna systems you have described, Ralph, they actually
> will give a fairly decent boost to the Tecsun models' AM reception once the
> frequencies are peaked, as described above. I wish I could build you a
> booster bar that would give you an immediate peaking response from the Tecsun
> models, but this is probably one congenital quirk that we will need to live
> with.
>
> 73 and Good DX, Gary
>
>
>
>
>
> In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time,
> rpollock@... writes:
>
> Dear Gary: I have been following your experiemnts with the 310/380 radios
> with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite
> could be adapted as an inductively connected booster for these radios. If that
> design would not work i am wondering if you would have any suggestions for
> such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27"
> Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and
> a tunable 2' x 2' home brew box loop do not seem to add any improvement in
> S/N over the entire varicap tuning range; however, all of these work well
> inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in
> particular.
>
> I would like to make an outboard inductively coupled booster for these
> little 310/380 wonders but am not sure how to proceed. A Spring trip to the
> Pacific Coast of Costa Rica is planned--would like to do some TP dxing from
> there, and like all the rest of us radio nuts, I'm a little greedy for more
> RF!!! Any thoughts you might be able to share would be deeply appreciated!
>
>
>
> Raph Pollock
>
>
>
> y
>


Re: 600 WSJS Winston-Salem NC heard at Noordhoek, South Africa

robert ross
 

freetodx wrote:
 

Hi guys

The mid summer months can provide some interesting TA reception here in South Africa.

WSJS Winston Salem NC on 600 kHz

During a recent family holiday/dxpedition to Noordhoek (approximately 20 kilometres south of Cape Town) I was fortunate to receive some early TA openings from the U.S.  Included was the surprise recepton of WSJS,  Winston Salem NC on 600 kHz for the first time via the Sony SRF M37V and 220 metre BOG  ( The 5 kw signal made it through over a distance of 12 830 km).


Gary:

   Hey I was listening to them just the other night around Midnight........at the honking big distance of about 500 Miles!!! Your reception sorta kicks the hell out of mine eh!!

Way to go....another GREAT piece of DX from South Africa!!! You are so lucky to be in a PRIMO DX Location!!!

Congratulations........and keep chalking them up with the Ultralights!! WOW!!!

73...ROB VA3SW

Robert S. Ross
London, Ontario CANADA


600 WSJS Winston-Salem NC heard at Noordhoek, South Africa

freetodx
 

Hi guys

The mid summer months can provide some interesting TA reception here in South Africa.

WSJS Winston Salem NC on 600 kHz

During a recent family holiday/dxpedition to Noordhoek (approximately 20 kilometres south of Cape Town) I was fortunate to receive some early TA openings from the U.S.  Included was the surprise recepton of WSJS,  Winston Salem NC on 600 kHz for the first time via the Sony SRF M37V and 220 metre BOG  ( The 5 kw signal made it through over a distance of 12 830 km).

QSL

Morning Show News Director Smith Patterson was quite surprised to receive my email reception report and sent the following reply a few hours ago :

" Confirmed most assuredly - Wow ! Really though thanks for sharing ! Everyone in the station, including the engineers are amazed. Glad to have corresponded with you. This made my day ! "

Smith also kindly promised to send something in the mail. The kind response sure made my day too ! 

AUDIO AND PICS

For those interested,  I've uploaded a brief audio clip of the reception and a panoramic image of the dx location to www.capedx.blogspot.com 

NOSTALGIA

The early years from a South African dxer's point of view at www.capedx.blogspot.com may also be also be of interest - inlcudes a few pics and some Trans Atlantic audio  from the 1970's.  

73's and wishing you all a happy, healthy and prosperous 2010 !

Gary Deacon

Fish Hoek

Cape Peninsula 

South Africa

www.capedx.blogspot.com


Re: Congratulations to Byron Johnson and Kirk Allen!!!

bbwrwy
 

Byron and Kirk;

Congratulations on your accomplishments. My best wishes to you for achieving further goals.

Good DX.

Richard.

Richard Allen
36°22'51"N / 97°26'35"W
[near Perry OK USA]
Sony SRF-T615, Tecsun PL-310 & PL-380 [barefoot]


Re: Tecsun PL-310/380 Inductive Coupling to External Antennas

dhsatyadhana <satya@...>
 

Hi Gary/all:

Thanks for giving us the blow-by-blow on this! This is a good guide to the procedure.

This is similar to what I did when I was out at the beach with my little active-passive loop, the tuning of which is very precise and so it's easy to miss where I am actually trying to be. Using the Sony 7600GR and its fairly useless tuning LCD indicator as a spotter, I would set it to SSB in order to get a het on a TP/TA, then tune the loop aurally to the het - this actually works pretty well since the het really jumps out, and is about as tough to miss as the Christmas tree lights on the 2010 :-). I would then do as Gary suggests - move the spotter aside and put the Ultralight in its place (or simply retune the Ultralight if coupling it to the loop with a little ferrite coupler, which is more convenient and provides better signal transfer).

Gary - with a large loop, do you notice any difference in the resultant signal strength between a stock PL-380 and an Amidon PL-380? It seems that if the loop is big enough, it would more or less completely dictate the signal level, making the stock PL-380 viable as a TA/TP receiver if one has a big loop in the mix.

Kevin S
Bainbridge Island, WA

--- In ultralightdx@..., D1028Gary@... wrote:

Hello All,

Ralph Pollock asked a very interesting question about peaking external
antennas for use with the Tecsun DSP models-- a subject which has also
interested me from the beginning, due to my use of the radios with large tuned
passive loops during DXpeditions. The correspondence below may be of interest
to those with similar questions.

73, Gary

From: d1028gary@... <d1028gary@...>
To: Pollock,Raphael E
Sent: Tue Jan 12 20:10:10 2010
Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models

Hello Ralph,

Thanks for your comments on the PL-310/380 experimentation, which are
appreciated.

Since these Tecsun DSP models have a somewhat delayed response to sudden
boosts in RF signal power from external antennnas, they typically don't have
the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6
when external antennas are peaked on their tuned frequency. The digital
signal strength readings on the PL-310/380 displays are also of little help,
since both models use an averaging system which causes a delay in changes
to the digital display reading. For this reason, even I have found it
counter-productive to try peaking external antennas by listening to the
PL-310/380 audio, or watching the RSSI or S/N readings change on the digital
display.

After receiving your email, I did attempt to use a Q-stick+ for peaking a
PL-380, and while inconvenient, it did provide a significant signal boost
according to the S/N digital display reading (after a wait of about 5
seconds). The problem is that the PL-380 has no immediate response (either audio
or visual) to the peaking of the external Q-stick on its tuned frequency,
making it tough to determine when you have hit the peak. You need to wait
about 5 seconds to find out.

After developing a series of huge loop antennas (with the related
technical article linked at _http://www.mediafire.com/?igw1zjwfzmw_
(http://www.mediafire.com/?igw1zjwfzmw) ) and using them exclusively during DXpeditions
with the Tecsun models, I have found that the best way to adjust these
monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's
red LED display to peak the loops, then simply bring the PL-310/380's into
the inductive coupling field of the loops. The ICF-2010 is ideal for this
purpose, especially on dark ocean beaches where the LED signal strength
display will light up like a Christmas tree when the loops are matched in
frequency.

For the external antenna systems you have described, Ralph, they actually
will give a fairly decent boost to the Tecsun models' AM reception once the
frequencies are peaked, as described above. I wish I could build you a
booster bar that would give you an immediate peaking response from the Tecsun
models, but this is probably one congenital quirk that we will need to live
with.

73 and Good DX, Gary





In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time,
rpollock@... writes:

Dear Gary: I have been following your experiemnts with the 310/380 radios
with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite
could be adapted as an inductively connected booster for these radios. If that
design would not work i am wondering if you would have any suggestions for
such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27"
Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and
a tunable 2' x 2' home brew box loop do not seem to add any improvement in
S/N over the entire varicap tuning range; however, all of these work well
inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in
particular.

I would like to make an outboard inductively coupled booster for these
little 310/380 wonders but am not sure how to proceed. A Spring trip to the
Pacific Coast of Costa Rica is planned--would like to do some TP dxing from
there, and like all the rest of us radio nuts, I'm a little greedy for more
RF!!! Any thoughts you might be able to share would be deeply appreciated!



Raph Pollock



y


Re: Ensuring I Order NEW Version Of PL-380

jim_kr1s <jkearman@...>
 

Michael,

When you order, you can specify in the PayPal comments. You have to pick a color, too (black, gray or silver). Joyce is very communicative and will get the message, and verify that she got your request.

As for the weather, I live 100 miles north of Miami, and my pipes were frozen Monday morning! I used to live on Grand Island, but I never expected Niagara Frontier temps in South Florida.

73,

Jim, KR1S


Ensuring I Order NEW Version Of PL-380

Michael <cglynn321@...>
 

I see a number of people ordering the "New" version of the Tecsun PL-380 by apparently talking directly to someone at Anon-co to ensure they get the newer version. My question is how do you contact Anon-co directly when ordering to ensure you get the newer version? I would like to order one using EBAY Canada but cannot see where/how I can order one ensuring I will get the newest version. I have been sitting on the fence watching the new posts and was going to get the PL-310( since I am mostly interested in North American AM dxing) but I am now leaning towards the Pl-380, and since I can only afford one right now I would like to be sure I get the newer version.
This seems like a great hobby to while away time after my operation and this cold winter here in Niagara Falls Canada.
Thanks again for the help


Re: Tecsun PL-310/380 Inductive Coupling to External Antennas

sdwillingham
 

Gary,

I've also found the Q-stick+ difficult to use with the Tecsun radios (and often with my ICF-SW7600GR which doesn't have a good tuning indicator). In my opinion, there are three reasons for this.

Number one is that coupling to the Tecsun loopstick is very poor, so positioning of the Q-stick+ is very sensitive. Some of my recent experiments indicate that the loopstick in my PL-300 has very low Q, on the order of 15-20.

A second problem is the slow update of the digital RSSI meter. A fast analog meter is much easier to adjust by. This is not so much a limitation of the radio chip, but simply a practical tradeoff in radio design. For general usage, the slow update saves battery power and minimizes digital interference. I think the radio's main controller "sleeps" for most of the time between updates. I just tried an experiment where I connected to my PL-300 via USB and "grabbed" RSSI updates at 5 per second. This made adjustment of the Q-stick+ fairly easy, achieving an 8-10 dB boost on a strong station.

On my other radios, I tend to adjust the Q-stick+ aurally by dithering the knob rapidily in small motions about the peak. Quick motions make the audio change more obvious because the AGC can't keep up and smooth them out. On the Tecsuns, the AGC is generally very effective and makes even this dithering technique hard to hear.

Your suggestion of using another radio to pre-peak the Q-stick+ is a good one. I would add that one should experiment carefully with Q-stick+ positioning. The loopstick winding on the Tecsuns is toward the left-end of the radio and moving the Q-Stick+ more to the left improves coupling dramatically. I've found that having the knob-end of the Q-stick aligned with the right edge of the PL-300 is a good alignment for my radio (and my Tecsun's coil is slid rightward of the stock position!). Also, I am seeing that coupling is better near the back of the radio than at the top. Hooking the flip-stand of the radio over the Q-Stick+ works well.

Cheers,
Scott

--- In ultralightdx@..., D1028Gary@... wrote:

Hello All,

Ralph Pollock asked a very interesting question about peaking external
antennas for use with the Tecsun DSP models-- a subject which has also
interested me from the beginning, due to my use of the radios with large tuned
passive loops during DXpeditions. The correspondence below may be of interest
to those with similar questions.

73, Gary

From: d1028gary@... <d1028gary@...>
To: Pollock,Raphael E
Sent: Tue Jan 12 20:10:10 2010
Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models

Hello Ralph,

Thanks for your comments on the PL-310/380 experimentation, which are
appreciated.

Since these Tecsun DSP models have a somewhat delayed response to sudden
boosts in RF signal power from external antennnas, they typically don't have
the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6
when external antennas are peaked on their tuned frequency. The digital
signal strength readings on the PL-310/380 displays are also of little help,
since both models use an averaging system which causes a delay in changes
to the digital display reading. For this reason, even I have found it
counter-productive to try peaking external antennas by listening to the
PL-310/380 audio, or watching the RSSI or S/N readings change on the digital
display.

After receiving your email, I did attempt to use a Q-stick+ for peaking a
PL-380, and while inconvenient, it did provide a significant signal boost
according to the S/N digital display reading (after a wait of about 5
seconds). The problem is that the PL-380 has no immediate response (either audio
or visual) to the peaking of the external Q-stick on its tuned frequency,
making it tough to determine when you have hit the peak. You need to wait
about 5 seconds to find out.

After developing a series of huge loop antennas (with the related
technical article linked at _http://www.mediafire.com/?igw1zjwfzmw_
(http://www.mediafire.com/?igw1zjwfzmw) ) and using them exclusively during DXpeditions
with the Tecsun models, I have found that the best way to adjust these
monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's
red LED display to peak the loops, then simply bring the PL-310/380's into
the inductive coupling field of the loops. The ICF-2010 is ideal for this
purpose, especially on dark ocean beaches where the LED signal strength
display will light up like a Christmas tree when the loops are matched in
frequency.

For the external antenna systems you have described, Ralph, they actually
will give a fairly decent boost to the Tecsun models' AM reception once the
frequencies are peaked, as described above. I wish I could build you a
booster bar that would give you an immediate peaking response from the Tecsun
models, but this is probably one congenital quirk that we will need to live
with.

73 and Good DX, Gary





In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time,
rpollock@... writes:

Dear Gary: I have been following your experiemnts with the 310/380 radios
with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite
could be adapted as an inductively connected booster for these radios. If that
design would not work i am wondering if you would have any suggestions for
such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27"
Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and
a tunable 2' x 2' home brew box loop do not seem to add any improvement in
S/N over the entire varicap tuning range; however, all of these work well
inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in
particular.

I would like to make an outboard inductively coupled booster for these
little 310/380 wonders but am not sure how to proceed. A Spring trip to the
Pacific Coast of Costa Rica is planned--would like to do some TP dxing from
there, and like all the rest of us radio nuts, I'm a little greedy for more
RF!!! Any thoughts you might be able to share would be deeply appreciated!



Raph Pollock


Re: Tecsun PL-310/380 Inductive Coupling to External Antennas

Roy <roy.dyball@...>
 

Hi Gary

I can imagine what is being explained would be frustrating.

I was not aware of any delay of audio reception due to the RF being boosted by the loop. I don't have a large loop though. I do have a small Degen AM/SW amplified loop and there is no delay in audio when the small ferrite coil is placed in the vicinity of the internal loopstick.

With my own software I tried to speed up the readings of the RSSI and S/N displaying them faster to their text boxes than the standard radio. It just does not work, the human brain cannot make sense of it. In the end after many different speeds I settled on 1.5 seconds between updates which is about the same as the Tecsun. An analogue meter is so intuitive and would be great but I don't think it is going to happen. I am finding that the more I use the standard display that I am sort of getting used to it and that is all we can do.

Cheers Roy. 

 

--- In ultralightdx@..., D1028Gary@... wrote:
>
> Hello All,
>
> Ralph Pollock asked a very interesting question about peaking external
> antennas for use with the Tecsun DSP models-- a subject which has also
> interested me from the beginning, due to my use of the radios with large tuned
> passive loops during DXpeditions. The correspondence below may be of interest
> to those with similar questions.
>
> 73, Gary
>
> From: d1028gary@... d1028gary@...
> To: Pollock,Raphael E
> Sent: Tue Jan 12 20:10:10 2010
> Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models
>
> Hello Ralph,
>
> Thanks for your comments on the PL-310/380 experimentation, which are
> appreciated.
>
> Since these Tecsun DSP models have a somewhat delayed response to sudden
> boosts in RF signal power from external antennnas, they typically don't have
> the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6
> when external antennas are peaked on their tuned frequency. The digital
> signal strength readings on the PL-310/380 displays are also of little help,
> since both models use an averaging system which causes a delay in changes
> to the digital display reading. For this reason, even I have found it
> counter-productive to try peaking external antennas by listening to the
> PL-310/380 audio, or watching the RSSI or S/N readings change on the digital
> display.
>
> After receiving your email, I did attempt to use a Q-stick+ for peaking a
> PL-380, and while inconvenient, it did provide a significant signal boost
> according to the S/N digital display reading (after a wait of about 5
> seconds). The problem is that the PL-380 has no immediate response (either audio
> or visual) to the peaking of the external Q-stick on its tuned frequency,
> making it tough to determine when you have hit the peak. You need to wait
> about 5 seconds to find out.
>
> After developing a series of huge loop antennas (with the related
> technical article linked at _http://www.mediafire.com/?igw1zjwfzmw_
> (http://www.mediafire.com/?igw1zjwfzmw) ) and using them exclusively during DXpeditions
> with the Tecsun models, I have found that the best way to adjust these
> monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's
> red LED display to peak the loops, then simply bring the PL-310/380's into
> the inductive coupling field of the loops. The ICF-2010 is ideal for this
> purpose, especially on dark ocean beaches where the LED signal strength
> display will light up like a Christmas tree when the loops are matched in
> frequency.
>
> For the external antenna systems you have described, Ralph, they actually
> will give a fairly decent boost to the Tecsun models' AM reception once the
> frequencies are peaked, as described above. I wish I could build you a
> booster bar that would give you an immediate peaking response from the Tecsun
> models, but this is probably one congenital quirk that we will need to live
> with.
>
> 73 and Good DX, Gary
>
>
>
>
>
> In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time,
> rpollock@... writes:
>
> Dear Gary: I have been following your experiemnts with the 310/380 radios
> with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite
> could be adapted as an inductively connected booster for these radios. If that
> design would not work i am wondering if you would have any suggestions for
> such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27"
> Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and
> a tunable 2' x 2' home brew box loop do not seem to add any improvement in
> S/N over the entire varicap tuning range; however, all of these work well
> inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in
> particular.
>
> I would like to make an outboard inductively coupled booster for these
> little 310/380 wonders but am not sure how to proceed. A Spring trip to the
> Pacific Coast of Costa Rica is planned--would like to do some TP dxing from
> there, and like all the rest of us radio nuts, I'm a little greedy for more
> RF!!! Any thoughts you might be able to share would be deeply appreciated!
>
>
>
> Raph Pollock
>
>
>
> y
>


Re: Tecsun PL-310/380 Inductive Coupling to External Anten...

Gary DeBock
 

Hello Roy and Scott,
 
Thank you both for very helpful comments regarding inductive coupling to the Tecsun models.
 
Roy, I suppose my own experiences with the Tecsun PL-310/380 trying to peak the tuning on the larger loops is not quite typical of what most DXers face, since the sudden rush of powerful RF tended to cause the Tecsuns' audio to pump in and out at differing levels, making it tough to know exactly when I matched the frequency. This issue was worse with the PL-310 than the PL-380, but neither model really made the process very easy. When using the loops larger than about 5', just listening for an audio peak as the loops were tuned rarely worked very well, so I needed to switch to the ICF-2010 to use as a loop peaking receiver (which was easy, since I always had one on hand as a spotting receiver for the Ultralights). When the Tecsun models were brought under the influence of the pre-peaked loops, it was amazing to hear the TP's dramatically stronger (after a slight one-second delay to settle down, after the sudden rush of RF). 
 
As Scott has confirmed, the digital RSSI and S/N displays are not really practical to use as loop tuning aids because of the delay involved, although they are useful to check the performance boost provided by the loops after the readings settle down.
 
Scott, thanks for the detailed explanation of the reasons for the limitations in Q-stick+ performance with the Tecsun models. You mentioned the poor inductive coupling of the Q-stick+ to the Tecsun models-- a problem that seems partially related to the flat design of the stock loopstick (which was also a problem in another Tecsun-manufactured model, the non-DSP Eton E100 series). Before the superlative achievement of your team's Si4734 DSP chip design, the E100 was probably the most effective Ultralight radio for general DXing-- but the small, flat stock loopstick never coupled up very well to external loops, leading to some disappointment. The Ultralight radios with larger, cylindrical loopsticks (DT-400 etc.) really performed very well with the external loops, including the Q-sticks, Quantum Loops, tuned passive loops, etc.
 
Thanks again for helping to explain the Si4734 chip functions to us, Scott-- it's a tremendous benefit to have you in our Ultralight radio group.
 
73, Gary DeBock (in Puyallup, WA)             
 

In a message dated 1/12/2010 10:20:45 P.M. Pacific Standard Time, sdwillingham@... writes:
 



Gary,

I've also found the Q-stick+ difficult to use with the Tecsun radios (and often with my ICF-SW7600GR which doesn't have a good tuning indicator). In my opinion, there are three reasons for this.

Number one is that coupling to the Tecsun loopstick is very poor, so positioning of the Q-stick+ is very sensitive. Some of my recent experiments indicate that the loopstick in my PL-300 has very low Q, on the order of 15-20.

A second problem is the slow update of the digital RSSI meter. A fast analog meter is much easier to adjust by. This is not so much a limitation of the radio chip, but simply a practical tradeoff in radio design. For general usage, the slow update saves battery power and minimizes digital interference. I think the radio's main controller "sleeps" for most of the time between updates. I just tried an experiment where I connected to my PL-300 via USB and "grabbed" RSSI updates at 5 per second. This made adjustment of the Q-stick+ fairly easy, achieving an 8-10 dB boost on a strong station.

On my other radios, I tend to adjust the Q-stick+ aurally by dithering the knob rapidily in small motions about the peak. Quick motions make the audio change more obvious because the AGC can't keep up and smooth them out. On the Tecsuns, the AGC is generally very effective and makes even this dithering technique hard to hear.

Your suggestion of using another radio to pre-peak the Q-stick+ is a good one. I would add that one should experiment carefully with Q-stick+ positioning. The loopstick winding on the Tecsuns is toward the left-end of the radio and moving the Q-Stick+ more to the left improves coupling dramatically. I've found that having the knob-end of the Q-stick aligned with the right edge of the PL-300 is a good alignment for my radio (and my Tecsun's coil is slid rightward of the stock position!). Also, I am seeing that coupling is better near the back of the radio than at the top. Hooking the flip-stand of the radio over the Q-Stick+ works well.

Cheers,
Scott

--- In ultralightdx@yahoogroups.com, D1028Gary@... wrote:
>
> Hello All,
>
> Ralph Pollock asked a very interesting question about peaking external
> antennas for use with the Tecsun DSP models-- a subject which has also
> interested me from the beginning, due to my use of the radios with large tuned
> passive loops during DXpeditions. The correspondence below may be of interest
> to those with similar questions.
>
> 73, Gary
>
> From: d1028gary@... ..>
> To: Pollock,Raphael E
> Sent: Tue Jan 12 20:10:10 2010
> Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models
>
> Hello Ralph,
>
> Thanks for your comments on the PL-310/380 experimentation, which are
> appreciated.
>
> Since these Tecsun DSP models have a somewhat delayed response to sudden
> boosts in RF signal power from external antennnas, they typically don't have
> the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6
> when external antennas are peaked on their tuned frequency. The digital
> signal strength readings on the PL-310/380 displays are also of little help,
> since both models use an averaging system which causes a delay in changes
> to the digital display reading. For this reason, even I have found it
> counter-productive to try peaking external antennas by listening to the
> PL-310/380 audio, or watching the RSSI or S/N readings change on the digital
> display.
>
> After receiving your email, I did attempt to use a Q-stick+ for peaking a
> PL-380, and while inconvenient, it did provide a significant signal boost
> according to the S/N digital display reading (after a wait of about 5
> seconds). The problem is that the PL-380 has no immediate response (either audio
> or visual) to the peaking of the external Q-stick on its tuned frequency,
> making it tough to determine when you have hit the peak. You need to wait
> about 5 seconds to find out.
>
> After developing a series of huge loop antennas (with the related
> technical article linked at _http://www.mediafire.com/?igw1zjwfzmw_
> (http://www.mediafire.com/?igw1zjwfzmw) ) and using them exclusively during DXpeditions
> with the Tecsun models, I have found that the best way to adjust these
> monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's
> red LED display to peak the loops, then simply bring the PL-310/380's into
> the inductive coupling field of the loops. The ICF-2010 is ideal for this
> purpose, especially on dark ocean beaches where the LED signal strength
> display will light up like a Christmas tree when the loops are matched in
> frequency.
>
> For the external antenna systems you have described, Ralph, they actually
> will give a fairly decent boost to the Tecsun models' AM reception once the
> frequencies are peaked, as described above. I wish I could build you a
> booster bar that would give you an immediate peaking response from the Tecsun
> models, but this is probably one congenital quirk that we will need to live
> with.
>
> 73 and Good DX, Gary
>
>
>
>
>
> In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time,
> rpollock@... writes:
>
> Dear Gary: I have been following your experiemnts with the 310/380 radios
> with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite
> could be adapted as an inductively connected booster for these radios. If that
> design would not work i am wondering if you would have any suggestions for
> such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27"
> Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and
> a tunable 2' x 2' home brew box loop do not seem to add any improvement in
> S/N over the entire varicap tuning range; however, all of these work well
> inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in
> particular.
>
> I would like to make an outboard inductively coupled booster for these
> little 310/380 wonders but am not sure how to proceed. A Spring trip to the
> Pacific Coast of Costa Rica is planned--would like to do some TP dxing from
> there, and like all the rest of us radio nuts, I'm a little greedy for more
> RF!!! Any thoughts you might be able to share would be deeply appreciated!
>
>
>
> Raph Pollock


Tecsun PL-310/380 Inductive Coupling to External Antennas

Gary DeBock
 

Hello All,
 
Ralph Pollock asked a very interesting question about peaking external antennas for use with the Tecsun DSP models-- a subject which has also interested me from the beginning, due to my use of the radios with large tuned passive loops during DXpeditions. The correspondence below may be of interest to those with similar questions.
 
73, Gary
 

From: d1028gary@...
To: Pollock,Raphael E
Sent: Tue Jan 12 20:10:10 2010
Subject: Re: LTG450GW Filter Modification to the SRF-M37V/W Models

Hello Ralph,
 
Thanks for your comments on the PL-310/380 experimentation, which are appreciated.
 
Since these Tecsun DSP models have a somewhat delayed response to sudden boosts in RF signal power from external antennnas, they typically don't have the sharp audio peaks normally found on radios like the ICF-2010, E5 and G6 when external antennas are peaked on their tuned frequency. The digital signal strength readings on the PL-310/380 displays are also of little help, since both models use an averaging system which causes a delay in changes to the digital display reading. For this reason, even I have found it counter-productive to try peaking external antennas by listening to the PL-310/380 audio, or watching the RSSI or S/N readings change on the digital display.
 
After receiving your email, I did attempt to use a Q-stick+ for peaking a PL-380, and while inconvenient, it did provide a significant signal boost according to the S/N digital display reading (after a wait of about 5 seconds). The problem is that the PL-380 has no immediate response (either audio or visual) to the peaking of the external Q-stick on its tuned frequency, making it tough to determine when you have hit the peak. You need to wait about 5 seconds to find out.
 
After developing a series of huge loop antennas (with the related technical article linked at http://www.mediafire.com/?igw1zjwfzmw ) and using them exclusively during DXpeditions with the Tecsun models, I have found that the best way to adjust these monster loops to the PL-310/380's tuned frequency is to first use the ICF-2010's red LED display to peak the loops, then simply bring the PL-310/380's into the inductive coupling field of the loops. The ICF-2010 is ideal for this purpose, especially on dark ocean beaches where the LED signal strength display will light up like a Christmas tree when the loops are matched in frequency.
 
For the external antenna systems you have described, Ralph, they actually will give a fairly decent boost to the Tecsun models' AM reception once the frequencies are peaked, as described above. I wish I could build you a booster bar that would give you an immediate peaking response from the Tecsun models, but this is probably one congenital quirk that we will need to live with.
 
73 and Good DX, Gary    
     
 
 
 
In a message dated 1/12/2010 8:55:23 A.M. Pacific Standard Time, rpollock@... writes:
Dear Gary:  I have been following your experiemnts with the 310/380 radios with keen interest. I am wondering if the 81 turn Amidon 7.5" ferrite could be adapted as an inductively connected booster for these radios. If that design would not work i am wondering if you would have any suggestions for such an external devise. My Selectatenna, a Q-Stick +, a homebrew 27" Stormwise ferrite antenna (40 turns of Schmarder Litz; tunable w/ varicap), and a tunable 2' x 2' home brew box loop do not seem to add any improvement in S/N over the entire varicap tuning range; however, all of these work well inductively with my E5, Sony 2010, or Grundig G6--the big ferrite in particular.
 
I would like to make an outboard inductively coupled booster for these little 310/380 wonders but am not sure how to proceed. A Spring trip to the Pacific Coast of Costa Rica is planned--would like to do some TP dxing from there, and like all the rest of us radio nuts, I'm a little greedy for more RF!!! Any thoughts you might be able to share would be deeply appreciated!
 


R
aph Pollock
y


Re: Congratulations to Byron Johnson and Kirk Allen!!!

john445 <john445@...>
 

Congratulations Byron and Kirk!


On Tue, Jan 12, 2010 at 2:49 PM, John H. Bryant <bjohnorcas@...> wrote:
 

Friends,

Byron Brown of Roseville, MI just nailed two more awards: 25 US States Heard - Barefoot and 4 Canadian Provinces Heard - Barefoot and has now receioved the Awards certificates from the Committee... Bravo, Byron! 

I almost break my two typing fingers when I try to type "Byron."  For almost 70 years, I've typed BRY rather than BYR.... BRY as in "Bryant" is just grooved in my brain!

Our other award certificate goes to Kirk Allen of Pasadena, Texas (suburban Houston.) He is now at or above the 150 Latin Stations Heard - Unlimited level and I'm like the rest of you, pretty-much speechless. Who could have EVER guessed that any DXer could ever hear 150 MW stations from Latin America on one of these little radios.... wow!

Congratulations to both Randy and Kirk on passing these milestones!

John Bryant
for The Awards Committee


An extensive group of awards certificates is available from the Ultralight MW DXing Awards Committee. Each recipient receives a digital file which may be used for electronic display or is suitable for framing when printed at 8 12" x 11" on good quality paper. Information on the Awards Program and the simple application procedures are found in the Downloads>Ultralight Files>General Information area of dxer.ca and our own file area here at ultralightdx. Applications go directly to Rob Ross <va3sw@...>
 


_




--
John Mosman
847-350-9566


Byron JOHNSON

John H. Bryant <bjohnorcas@...>
 

Geez, I just posted congratulations for 25 States and 4 Canadian Provinces to Byron "Brown"  Well, I don't know where that came from, except I was concentrating on his f irst name because of the BYR....

One of the nicest things about being well beyond 65 is that people kinda cut you some slack, especially for mental lapses.  I went back and checked the awards and who they went to.... both answers are Byron JOHNSON!

Sorry Bryon.... erh, ah, Byron!

John Byrant


Congratulations to Byron Johnson and Kirk Allen!!!

John H. Bryant <bjohnorcas@...>
 

Friends,

Byron Brown of Roseville, MI just nailed two more awards: 25 US States Heard - Barefoot and 4 Canadian Provinces Heard - Barefoot and has now receioved the Awards certificates from the Committee... Bravo, Byron! 

I almost break my two typing fingers when I try to type "Byron."  For almost 70 years, I've typed BRY rather than BYR.... BRY as in "Bryant" is just grooved in my brain!

Our other award certificate goes to Kirk Allen of Pasadena, Texas (suburban Houston.) He is now at or above the 150 Latin Stations Heard - Unlimited level and I'm like the rest of you, pretty-much speechless. Who could have EVER guessed that any DXer could ever hear 150 MW stations from Latin America on one of these little radios.... wow!

Congratulations to both Randy and Kirk on passing these milestones!

John Bryant
for The Awards Committee


An extensive group of awards certificates is available from the Ultralight MW DXing Awards Committee. Each recipient receives a digital file which may be used for electronic display or is suitable for framing when printed at 8 12" x 11" on good quality paper. Information on the Awards Program and the simple application procedures are found in the Downloads>Ultralight Files>General Information area of dxer.ca and our own file area here at ultralightdx. Applications go directly to Rob Ross
 


_


Re: New version of Tecsun PL-380

Gary DeBock
 

Hello Jm392c,
 
Thanks for your initial report on the "new version" PL-380, which is helpful to the group.
 
My own "new version" PL-380 arrived today by EMS shipment from Joyce of "Anon-co," and was manufactured in December with a serial number very similar to yours (36920091201007). After a thorough initial checkout in comparison to the previous PL-380 models, there is no apparent difference in any of the AM-related functions, including the "soft mute" level (which still seems significantly reduced from the PL-310's irritating level).
 
Those with new PL-380's should be aware that changes in the DSP filtering selection can have major effects on AM sensitivity, so that switching to the 2 or 1 kHz setting can increase AM sensitivity (and the S/N ratio reading in the display) significantly. Consequently, when comparing the live signal AM reception of two identical PL-380's, it is essential that both radios have the same DSP filter setting to ensure accurate results.
 
From the standpoint of an AM-DXer, it certainly seems that Tecsun has not many any negative changes in these "new version" PL-380 models, so interested hobbyists are advised to order with confidence.
 
73, Gary DeBock (in Puyallup, WA, USA) 
 
   
 

In a message dated 1/11/2010 10:50:26 A.M. Pacific Standard Time, jm392c@... writes:
 



--- In ultralightdx@yahoogroups.com, Mark Roberts .> wrote:
>
> At the end of the year just concluded, I purchased a Tecsun PL-380
> from anon-co. Joyce responded and asked if I wanted the old version or
> the new version! She indicated that, on the last day of the year,
> Tecsun released a new version. So I've asked for the new version and
> it is on its way.
>
> Thought folks on the list would be interested in this news ....
>
In response to requests for info on the "new" vs."old" PL-380 I would like to report that I recieved a PL-380 on 11 Jan 2010 here on the east coast of the U.S. The date on it is 12/2009, the s/n is 36920091201033, and it has two screws in the battery compartment. I can't compare it to the PL-310, having never seen one, but it seems that there is not much of a soft mute problem. I will report on this more after I have done further investigation.

jm392c


One New One Last Night- WARE-1250

John Cereghin <jcereghin@...>
 

It's been a while since I've had a new station for the UL log. I did
great up in Nova Scotia, logging 8 countries on the PL-310 barefoot,
but back to my Delaware drought that I've been in since mid-December.
But I did add a new station last night- finally!

1250 WARE, Ware MA, Jan 11, 2300, caught partial TOH ID "...your
hometown station...WARE, Ware, Sturbridge..." Also heard them last
Sunday on the car radio with standards music. UL station 661. Caught
on the PL-310 barefoot.

John Cereghin
Smyrna DE


MI LOG

wa8lcz
 

0790 WLSV NY Wellsville, 11Jan10 1840 EST, 1k 41w New
1290 WFBG PA Altoona, 11Jan10 1905 EST, 5k New
1290 WNBF NY Binghamton, 11Jan10 1906 EST, 9k New
1290 CFRW Manitoba, Winnipeg, 11Jan10 1915 EST, 10k New
1170 WINA VA Charlottsville, 11Jan10 1940 EST, 5k 5k New
1470 WMBD IL Peoria 11Jan10 2051 EST, 5K 5K New

from 1900 to 1920 EST, the frequency was wide open. I could just rotate the radio a few degrees and hear a new station. stations i havent heard yet in 8 months. heard many of the old favorites: WBAP TX, WSB GA, WWL LA, KOA CO. heard my 2nd Manitoba, after getting a Saskatchewan this morning. you don't have many days like this one.

Byron wa8lcz ULR Sony SRF-M40W


Re: LTG450GW Filter Modification to the SRF-M37V/W Models

Gil Stacy
 

Gary,
I'll forward you emails that I've sent out to several folks regarding the procedure. In the photo section of our group, I have a couple of photos that should help.
73 Gil