Date   

New Log- WWCB-1370

John Cereghin <jcereghin@...>
 

Sat on 1370 for a while tonight and was surprised by 1370-WWCB in
Corry PA with two call IDs at 2245. Couldn't discern the programming
as it was mixing badly with WSPD and WXXI, but two good IDs for UL
station #663., also a new one for my master log, station number 881.
Heard on the PL-310 barefoot.

John Cereghin
Smyrna DE


FM DX Tonight?

Scott <scottmac1120@...>
 

Hey all:

Anybody else tried the FM band out tonight? I'm getting very unusually strong reception on many stations I've never heard before!

Scott
Hobbs, New Mexico


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

Gary Kinsman
 

Hi Scott,

When I use the Q-Stick with my 7600GR, I reduce the signal strength using the attenuator, peak the Q-Stick, and then increase the signal strength using the attenuator. I find that using this technique makes it easier to optimize the tuning on the Q-Stick.

Regards,
Gary

--- In ultralightdx@..., "sdwillingham" <sdwillingham@...> wrote:

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.


Cheers,
Scott


TECH: PL310 stock loopstick tested

Steve Ratzlaff <steveratz@...>
 

I removed the Tecsun PL310 stock loopstick today and checked it on the HP4342A Q meter. Since this model ULR is about the only one that will receive anything on LF (my closest LF NDB is 20 miles away, on 296 kHz), I was curious how the loopstick measured. Bottom line is this loopstick works has very low Q at MW above about 1000 kHz and is optimized more for LF reception!
I will have to check the loopstick in my PL380 next and see if it's similar, though that model doesn't hear anything on LF even though the loopsticks look the same visually.

The PL310 loopstick measured 322 uH at 796 kHz, with a Q of 86. (The Q meter uses certain fixed frequencies on various ranges when measuring inductance; a range is chosen to peak the Q for a given inductance being tested, then the inductance is read off the dial.)

1500 kHz Q 20 (that's the highest frequency I could check Q at since the Q meter's variable cap was at its minimum setting)
1300 kHz Q 31
900 kHz Q 71
700 kHz Q 106
530 kHz Q 160
500 kHz Q 172
400 kHz Q 203
300 kHz Q 228
200 kHz Q 229

73,
Steve


Re: Early results of 7.5" Amidion rod

neil.findlay52
 

Hi all
And a question to Roy
 
Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae as my spotter reciever
 
Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do have a flat rod of unknown
ferrite type ( probably bought from local electronics supplier years ago ) it is 7&7/8 inch long by
3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal but at that size would it
be worth a try. I am off work / working from home at around 40% for two weeks after a minor
operation so will have some time and the Amidon rods wont arrive in that time. 
 
Roy
I am interested in what ypu have been able to hear from the East and North East also have you
ever heard a Western Australian station. I live at Rothwell ( on the edge of Deception Bay) just
going off the Redcliffe Peninsular. I have heard Fiji and many New Zealanders. I can hear a lot
of asians but not good at recognising the languages. My son knows some japanese and can rcognise
so will try for some of the powerhouses that Gary hears ie 747 etc. I have never heard a West Aust
yet. My other project is to get the Vactrol connected to the 3 Kaz antenna and wind a coupling on to
the 380 - I have some wire wrap from years ago computer projects.
 
This is the best group that I have part of in Medium Wave - a most co-operative group covering
listening and technical even part of the design team of our prime chip. Thank you for everyones effort
and for making the information available
 
Neil    


From: Roy
To: ultralightdx@...
Sent: Thu, 14 January, 2010 10:50:38 AM
Subject: [ultralightdx] Early results of 7.5" Amidion rod

 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 



See what's on at the movies in your area. Find out now.


Early results of 7.5" Amidion rod

Roy <roy.dyball@...>
 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 


Re: update on KEVT

Carl DeWhitt
 

oops! Excuse my boo boo !I did not notice the 2007 date before i posted this.

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


Re: TECH: PL310 stock loopstick tested

Gary DeBock
 

Hi Steve,
 
Thanks very much for investigating the PL-310 stock loopstick Q readings, and it's great to have you back in ULR tinkering. Those are very interesting results on the LW frequencies, and may help to explain why the PL-310's LW performance is so much better than that of the PL-380.
 
I have ordered some type 33 Amidon 7.5" ferrite bars and 165/46 Litz wire for some experiments to create an LW-optimized 7.5" loopstick PL-380, and will be interested to find out the optimum coil inductance for maximum LW sensitivity. I'll probably need to construct a longer Slider coil than the 81-turn model used for the peak AM sensitivity tests, to allow shifting the coil inductance up past 1000 uh (judging from your PL-300WT optimum LW inductance tests).
 
The SWP 7.5" Slider models that you helped create (by designing the CFJ455K5 filter mod) have been outstanding DXpedition performers throughout the past year, but they may finally have some serious competition from the new 7.5" Amidon PL-380's (Kevin's term :-)
 
Welcome back, and have fun.
 
73, Gary
 
  
 

In a message dated 1/13/2010 7:08:37 P.M. Pacific Standard Time, steveratz@... writes:
 

I removed the Tecsun PL310 stock loopstick today and checked it on the
HP4342A Q meter. Since this model ULR is about the only one that will
receive anything on LF (my closest LF NDB is 20 miles away, on 296 kHz), I
was curious how the loopstick measured. Bottom line is this loopstick works
has very low Q at MW above about 1000 kHz and is optimized more for LF
reception!
I will have to check the loopstick in my PL380 next and see if it's similar,
though that model doesn't hear anything on LF even though the loopsticks
look the same visually.

The PL310 loopstick measured 322 uH at 796 kHz, with a Q of 86. (The Q meter
uses certain fixed frequencies on various ranges when measuring inductance;
a range is chosen to peak the Q for a given inductance being tested, then
the inductance is read off the dial.)

1500 kHz Q 20 (that's the highest frequency I could check Q at since the Q
meter's variable cap was at its minimum setting)
1300 kHz Q 31
900 kHz Q 71
700 kHz Q 106
530 kHz Q 160
500 kHz Q 172
400 kHz Q 203
300 kHz Q 228
200 kHz Q 229

73,
Steve


Re: update on KEVT

Carl DeWhitt
 

dxtests.info is still listing a possible test from KEVT at 0030 PST this Thursday with 10 kW non-directional.No e mail answer yet from Sr.Zamora,CEO.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


update on KEVT

Carl DeWhitt
 

This is from dxtests.info. It differs from what i read in that e mail .But i intend to check the frequency Thursday morning anyway.
Carl DeWhitt
Maryville,Tn.

KEVT 1210 kHz Sahuarita (Tucson), Arizona DX Test

Date: Monday morning (late Sunday night), Dec. 17, 2007.
Time: Midnight - 3:00 a.m. Mountain Standard Time, 0700 - 1000 UTC.
Modes of Operation: 10,000 watts using non-directional antenna pattern.
Programming: Station will be running regular Spanish-language programming with frequent use of their "La Raza" slogan, and English IDs at top of the hour.

QSL Information: The Broadcast Test Committee will be handling all reception reports and verifications for this test. Both eQSL service and traditional paper QSLs will be offered. Recordings on disk in .mp3 or .wav format, audio files via e-mail or cassette recordings will be accepted as proof of reception. Send reception reports and recordings to:

IRCA/NRC Joint BTC,
Attn: KEVT DX Test,
P.O. Box 3777,
Memphis, TN 38173-0777 USA.

E-mail reports and audio files may be sent to: KH2AR[at]comcast.net.

NOTE: All requests for paper verifications must be accompanied by return postage in order to receive a reply.


Re: Early results of 7.5" Amidion rod

Gary DeBock
 

Hello Roy and Neil,
 
Thanks for your comments on our group, Neil.
 
Roy, in my previous post there was a description of the method that Steve Ratzlaff and I used to optimize AM reception in the Tecsun PL-300WT and G8 models, and to determine the optimum loopstick coil inductance for peak AM sensitivity in the stock models (and in the 7.5" Amidon loopstick transplant models). That procedure is actually described in a file posted in our Ultralightdx site (under modifications), and is also directly linked at http://www.mediafire.com/?jyjg5hmkyqm .
 
Once we determined the optimum loopstick coil inductance for peak AM sensitivity in the models, we simply wound a fixed 40/44 Litz wire coil of the same inductance on the 7.5" Amidon ferrite bar, and obtained great results every time. Although their AM sensitivity was equal to the best of the modified Ultralights, unfortunately the fixed 3 kHz DSP selectivity in the 7.5" loopstick PL-300WT/ G8 models made them uncompetitive in transoceanic DXing when compared to the CFJ455K5 filter-modified E100 Slider and SWP Slider 7.5" loopstick models, so we didn't make too many of the modified PL-300WT/ G8 models last spring.
 
73 and Good DX, Gary
 
 
 
                                                                
 

In a message dated 1/13/2010 5:51:24 P.M. Pacific Standard Time, neil.findlay52@... writes:
 

Hi all
And a question to Roy
 
Currently using a 310 and a 380 with my Palstar R30a with 3 Kaz antennae as my spotter reciever
 
Just got my order of 40/44 litz wire, not yet got the Amidon rods. I do have a flat rod of unknown
ferrite type ( probably bought from local electronics supplier years ago ) it is 7&7/8 inch long by
3/4inch by 3/16 inch - The comment seem to indicate that flat is not ideal but at that size would it
be worth a try. I am off work / working from home at around 40% for two weeks after a minor
operation so will have some time and the Amidon rods wont arrive in that time. 
 
Roy
I am interested in what ypu have been able to hear from the East and North East also have you
ever heard a Western Australian station. I live at Rothwell ( on the edge of Deception Bay) just
going off the Redcliffe Peninsular. I have heard Fiji and many New Zealanders. I can hear a lot
of asians but not good at recognising the languages. My son knows some japanese and can rcognise
so will try for some of the powerhouses that Gary hears ie 747 etc. I have never heard a West Aust
yet. My other project is to get the Vactrol connected to the 3 Kaz antenna and wind a coupling on to
the 380 - I have some wire wrap from years ago computer projects.
 
This is the best group that I have part of in Medium Wave - a most co-operative group covering
listening and technical even part of the design team of our prime chip. Thank you for everyones effort
and for making the information available
 
Neil    


From: Roy com>
To: ultralightdx@yahoogroups.com
Sent: Thu, 14 January, 2010 10:50:38 AM
Subject: [ultralightdx] Early results of 7.5" Amidion rod

 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 



See what's on at the movies in your area. Find out now.


Re: possible dx test

Carl DeWhitt
 

I just sent a query to Sr.Armando Zamora,CEO, about the test.I am awaiting his reply.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

I just heard their slogan on the online stream."La Raza Doce Diez"(1210).I listening to the online stream now in hopes of hearing the legal i.d. on the hour.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@> wrote:

Here is KEVT website and the CEO's name and e mail address.They do have live web audio also.

http://www.laraza1210.com/esp/


Armando Zamora
President / CEO
azamora@
The CEO maybe the one to send QSL requests to according to a report i saw elsewhere online.

Carl DeWhitt
Maryville,Tn.
--- In ultralightdx@..., "carl_elissa" <carl_elissa@> wrote:

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: possible dx test

Carl DeWhitt
 

I just heard their slogan on the online stream."La Raza Doce Diez"(1210).I listening to the online stream now in hopes of hearing the legal i.d. on the hour.
Carl

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

Here is KEVT website and the CEO's name and e mail address.They do have live web audio also.

http://www.laraza1210.com/esp/


Armando Zamora
President / CEO
azamora@...
The CEO maybe the one to send QSL requests to according to a report i saw elsewhere online.

Carl DeWhitt
Maryville,Tn.
--- In ultralightdx@..., "carl_elissa" <carl_elissa@> wrote:

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: possible dx test

Carl DeWhitt
 

Here is KEVT website and the CEO's name and e mail address.They do have live web audio also.

http://www.laraza1210.com/esp/


Armando Zamora
President / CEO
azamora@...
The CEO maybe the one to send QSL requests to according to a report i saw elsewhere online.

Carl DeWhitt
Maryville,Tn.

--- In ultralightdx@..., "carl_elissa" <carl_elissa@...> wrote:

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: Early results of 7.5" Amidion rod

Gary DeBock
 

Hi Roy,
 
Thanks for the excellent report of your coil winding results with the 7.5" Amidon rod.
 
Concerning the modification of the Tecsun PL-300WT/ Grundig G8 models, Steve Ratzlaff and I did multiple AM "alignments" of the radios by loosening the stock loopstick coils, and shifting them slightly, while listening for increasing or decreasing AM signal levels. Most of the PL-300WT/ G8 models had some AM signal improvement by this procedure, which we used to optimize reception for various DXers.
 
After aligning the coils for maximum AM sensitivity, we would always check the final inductance of the coils after shifting them. In the case of the PL-300WT/ G8 models, this final coil inductance was always within the 180- 450 uh specification called for in the Si473x spec sheet. Once the optimum coil inductance was found (most of them were around 300 uh, or fairly close to the stock coil position), the same coil position provided maximum AM sensitivity throughout the AM spectrum. Steve and I did about 15 of these alignments, for ourselves and others. In this regard, the optimum loopstick coil inductances observed in the PL-300WT/ G8 models never deviated from the 180- 450 uh specification.
 
Of course, there were multiple requests for 7.5" Amidon loopstick-modified PL-300WT/ G8 models at the time, and I made several of these up for myself, and others. The procedure was to first "align" the stock coil to determine the optimum inductance value for maximum AM sensitivity (as described above), then to remove the stock loopstick from the radio, replacing it with an Amidon 7.5" type 61 ferrite bar wound with a fixed 40/44 Litz wire coil of the same optimal inductance value. The procedure always provided a maximum level of AM sensitivity from 530- 1700 kHz, with no Si4734 varactor issues on the high band. About five of these 7.5" loopstick PL-300WT/ G8 models were constructed here (two going to the Massachusetts DXers Mark Connelly and Chris Black), and Steve also made several of them-- all of which worked very well in DXing. The issue was that because the DSP selectivity was fixed at the 3 kHz setting in these models, these 7.5" loopstick PL-300WT/ G8 models never were competitive with the CFJ455K5 filter-modified E100 7.5" Slider models in transoceanic DXing. The fanatical ULR hot-rodders (like me) then decided to hold off on more modifications, until we could receive some new Si4734 radios offering the desired 1 kHz DSP selectivity.
 
I hope this information will be useful.
 
73 and Good DX,
Gary DeBock
      
 

In a message dated 1/13/2010 4:50:53 P.M. Pacific Standard Time, roy.dyball@... writes:
 

Hi All

The first coil was wound on the 7.5 inch rod with 165/46 spaced using 0.7mm solder as the spacer which is about the same size as the Litz, wound over 110mm centred on the rod. The capacitance reported by the G8 showed it had bottomed out at 1710Khz. I removed 2mm from each end and the capacitance showed 18 Pf at 1710Khz (7pf is the lowest). This resulted in aprox 15dbu increase on the G8 when compared to a stock PL-310 set a 3Khz bandwidth, holding this to the end of the band.

I was able to hear a station in another state on 1323Mhz (Cruise AM in Adelaide) last night that I have tried on and off and have never been able to receive at a distance of over 1600 KM (great circle) while listening with the radio on my bed side table.

I then decided to emulate Gary's 81 turn 40/44 coil starting at 43mm. The G8 reported it was bottoming out of capacitance at 1540Khz. I ran my standard tests and found this configuration was performing the same as the 165/46 coil at the bottom of the band but was dropping off by around 1200Khz (2-3 dbu).

I had to unwind 18 turns to get the G8 to report a value of 12pf at 1710Khz. This only dropped the very end of the (low) band by 2 dbu but had started to pick up by 1200Khz. I won't know  how well it performs until tonight when the high end of the band opens.  For now it is performing aprox 13dbu better than the stock PL-310.

Gary has reported that his coil shows a better improvement when fitted to the 380 than the 310. Probably this coil would perform better in the PL-380 than the G8. I will try that later. I am also going to rewind the first coil but use 0.5mm spacing.

Roy.

 


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