Date   

Not Beach Loggings, But...

Kirk
 

Hi Gang,

Gary, I really enjoyed the posting about MW DXing from the North American ocean beaches! That's just a pipe-dream for us landlocked DXers of Oklahoma. Of course I don't have any TA or TP loggings to report this morning, but I did luck into TWO new stations in less than an hour this morning after work, both on the productive frequency of 1340 khz!

1340, KRHC, Burnet, Texas, 1101 UTC, 7/1/11, tuned in to one of the Texas News Newtworks w/ nx headlines. Hrd a quick call letter ID and some talk, but soon lost to the station below. I called the station, and they confirmed I was hearing them. ULR Sta #764.

1340, KDTD, Kansas City, KS, 1111 UTC, 7/1/11, Suddenly covered KRHC w/ back to back ranchera mx. All SS pgm'g w/ call ltr ID and "La Gran D" slogans hrd (which sounds just like "La Grande" of course.) Been trying for this one for around a year now. ULR Sta #765.

Wow, this was a nice surprise this morning for sure. My 4 day weekend has certainly started on a positive note! Logged these stations on my Sony T-615 rcvr w/ a SAT antenna. Incidentally, these stations were the 17th and 18th stations hrd on 1340 khz! I believe that's my most productive freq out of them all.

Wishing good DX to all and 73!

Kirk Allen
Ponca City, OK


A Midsummer AM-DXing Dream

Gary DeBock
 

Hello All,

If you are looking for Good Vibrations while DXing in the middle of
summer, why not consider becoming one of the Beach Boys? (the ocean
beach boys, that is). Wouldn't It Be Nice to forget about summer
static, and enjoy the Fun, Fun, Fun of long-range DX again?

Because of an AM-band propagation quirk in the middle of summer, North
American DXers who head for the ocean beaches during sunrise (on the
West Coast) or sunset (on the East Coast) have unusually good chances
of logging Trans-Equatorial DX from very long distances. Despite the
fact that the Northern Hemisphere is generally in the middle of its AM
propagation doldrums, the Southern Hemisphere is now in its peak winter
season-- and DXers on ocean coasts can tap into a great propagation
pipeline if they know where and when to listen.

DXers on the West Coast should head for the ocean beach well prior to
sunrise, and be completely set up prior to any trace of daylight (in
Washington or Oregon during July, this means being ready for action at
0430 local time). Bring your Ultralight radio with 1 kHz DSP
selectivity (PL-310, PL-380, PL-606 or D96L), or else bring a Murata
CFJ455K5 filter-modified E100 or SWP. Your odds of success will be
further enhanced if you can also bring any type of gain antenna (simple
air-core tuned passive loop, Quantum Loop or other modest gain
antenna), and/ or set up your listening station on a cliff-side
location with the beach directly below. Don't worry about needing huge
gain antennas-- the ocean beach propagation will usually provide more
than enough gain for simple Ultralight radios with modest loops to
receive strong signals from Australia, New Zealand and Tahiti.

What can you hope to receive during one of these mid-summer,
half-asleep beach runs? Well, on the West Coast you may feel like you
are in a dream as booming signals from the South Pacific show up on
your Ultralight radio for over an hour. You may have great signals from
the Pacific Islands (Tahiti, Fiji, Tonga), New Zealand, Australia or
any combination of these areas. Signal strengths can be astonishing--
last year in Lincoln City (OR) my modified PL-380 and 3' loop received
a startling combination of 738-Tahiti and 738-2NR (Grafton, Australia)
that maxed out my PL-380's S/N readout at 25
(http://www.mediafire.com/?eea954j14dmzalm ). Obscure 2.5 kw or 5 kw
stations from New Zealand or Australia may show up, or you may receive
a rare Pacific Island station. Or you may come away with practically
nothing, if propagation is poor-- it's all part of the challenge. Your
odds of great South Pacific DXing success increase if you can schedule
a beach trip for a few days, instead of trying your luck on just one
(early) morning.

Unlike Asiatic TP-DXing, you had better be extremely close to the salt
water (within about 500 feet) to have much chance of success, since for
some unknown reason the DU signals drop out very quickly over land
paths. Mark Connelly has enjoyed the East Coast version of
Trans-Equatorial DXing during summer sunsets on East Coast beaches
(with superior gain antennas), and has noticed the same salt water
beach effect. You need to be near the surf for the best odds. In
general, a few days of exciting T/E DXing will give you a head start on
the upcoming DX season, and may well provide your biggest DXing thrills
for the entire year!

73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)

References
July 2010 Oregon Beach Ultralight DXpedition
http://www.mediafire.com/?we4r6gh50gaa4i6
August 2010 Lincoln City DXpedition
http://www.mediafire.com/?9tjd0pqpa4ld2f0


Re: Mexican Stations

ginger_92@rocketmail.com
 

Richard, thanks a lot, that's a huge help, saved and printed!! Hopefully a lot of it's still relevant.

Ginger OKC

--- In ultralightdx@..., "Richard Allen" <richarda@...> wrote:

Ginger:

I'm sending you a list directly. Sadly there is no satisfactory up-to-date listing of Mexican AM stations.

Good listening.

Richard.

Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)


Re: Third Party SDR Software for Alinco DX-R8T Receiver

Jeffrey Fritz <jnfritz07@...>
 

Thanks to various members of the Ultralightdx group for responding to my post about SDR software for the new Alinco DX-R8T communications receiver. I am pleased to share that we have received several positive responses to the post. As a result, Carl Moreschi, N4PY, has indicated that he is willing to implement support for the DX-R8T in his popular Pegasus Plus SDR control software.

Stay tuned for more details and thanks to all who responded.

73,

Jeff WB1AAL


Re: 1710 kc last night

Steve KT5H
 

Hi Mark, thanks for the reply.

No, I'm not sure at all! :-)

It was a clear KLIF ID, so if KKLF is simulcasting, that is probably what I was hearing.

That sure makes more sense than hearing the 3rd harmonic of KLIF!

Thanks for the information!

Now to see if I can catch their KKLF ID!

Steve


Now I'll have to

--- In ultralightdx@..., "airchecklover" <mdh@...> wrote:

Hi Steve;
Are you sure you were not hearing KKLF at 1700 (10KW-D/1KW-N)- a relay or mirror as of last year for KLIF?

Info found at radio-locator here:
http://radio-locator.com/cgi-bin/finder?call=kklf&x=14&y=10&sr=Y&s=C

-Mark

++++++++++++++++++++++


--- In ultralightdx@..., "ae5sp" <srporter@> wrote:

Listened again last night with surprising results.

I heard the 3rd harmonic of KLIF 570 on 1710 (and even stronger on 1700). It was a stronger signal on 1700 than it was on 570!

The previous reference to networkradio.com remains puzzling to me.

Steve


--- In ultralightdx@..., Steve Porter <srporter@> wrote:

1710 kc, 0221 UT, 28 June 2011

EE male, mention of networkradio.com, east/west orientation from
central Arkansas

heard on SRF-M37W, stock & barefoot

Was it a ghost, or did I really hear it?!

I'll tune in again tonight to hear

72 es gud dx,
Steve


Re: 1710 kc last night

Mark/airchecklover
 

Hi Steve;
Are you sure you were not hearing KKLF at 1700 (10KW-D/1KW-N)- a relay or mirror as of last year for KLIF?

Info found at radio-locator here:
http://radio-locator.com/cgi-bin/finder?call=kklf&x=14&y=10&sr=Y&s=C

-Mark

++++++++++++++++++++++

--- In ultralightdx@..., "ae5sp" <srporter@...> wrote:

Listened again last night with surprising results.

I heard the 3rd harmonic of KLIF 570 on 1710 (and even stronger on 1700). It was a stronger signal on 1700 than it was on 570!

The previous reference to networkradio.com remains puzzling to me.

Steve


--- In ultralightdx@..., Steve Porter <srporter@> wrote:

1710 kc, 0221 UT, 28 June 2011

EE male, mention of networkradio.com, east/west orientation from
central Arkansas

heard on SRF-M37W, stock & barefoot

Was it a ghost, or did I really hear it?!

I'll tune in again tonight to hear

72 es gud dx,
Steve


Re: Mexican Stations

bbwrwy
 

Ginger:
 
I'm sending you a list directly.  Sadly there is no satisfactory up-to-date listing of Mexican AM stations.
 
Good listening.
 
Richard.
 
Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)


Links to Mexican Stations

ginger_92@rocketmail.com
 

Thank you for all the link's guys, that helps out a lot!

Ginger OKC


Re: Inductance Meter(s) to measure 7.5 Longwave Loopstick Inductance - Where to get?

jerry_popiel
 

--- In ultralightdx@..., <ve7sl@...> wrote:

Found the DM 4070 on ebay, but unfortunately it looks like it only ships to
USA but Not to Canada where I reside.
Jerry - read his description page further down. He ships to Canada for $8.

Steve



WEB - "The VE7SL Radio Notebook": http://members.shaw.ca/ve7sl
Thanks Steve, found it. Hope it measures to 1700 uh. Local Fluke meters here are about $156.00.


Re: PL-390 FM DX

just_rtfm
 

howdy!

you're welcome. i, unfortunately, did not record the RSSI values.

My tests show that Stereo switch off not only
due to SNR<11dB, but RSSI<16dBu also.
awesome work! Tecsun has been informed so it would be interesting to test future versions.

regards,
phil :)


Re: Third Party SDR Software for Alinco DX-R8T Receiver

w4asz@bellsouth.net
 

That sounds like a fine idea. I do not (yet) own one of the Alincos, but I have a venerable Ten Tec Omni V that has the N4PY chip, so I know Carl can shake and bake with the best. He's a nice guy, too !

Steve, W4ASZ

--- In ultralightdx@..., "jnfritz07" <jnfritz07@...> wrote:

Since the Alinco DX-R8T/E receiver has been discussed previously on the ultralightdx Yahoo group, I thought that the following might be of interest to the group.

********************************************************************************

Alinco offers third party Software Defined Radio (SDR) software for their new communications receiver, the DX-R8T/E. This software is called KG-SDR. It looks nice and is free, but it is also somewhat limited. There are other SDR applications out there that are more full featured, but few, if any, currently support the DX-R8T/E. This is in part, because the rig is quite new and also, in part, because Alinco isn't one of the "big three" thus making its addition to SDR software far from automatic.

Still, there are indications that the Alinco DX-R8T will be a popular receiver for hams and SWLers alike. Therefore, I've asked Carl Moreschi, N4PY, if he would be willing to implement support for the DX-R8T in his popular N4PY SDR control software. (See: www.n4py.com)

Happily, Carl has indicated that if someone besides me is interested in DX-R8T/E SDR support in his N4PY SDR control software, he will program support into his application. If this is something that you feel would be worthwhile to you, please respond to this post. I will relay this on to Carl.

A couple of cavaets:

1. I have no connection what-so-ever with Carl Moreschi or the N4PY SDR control software other than as an interested DX-R8T owner who would like his SDR software to support the radio.

2. Although I generally avoid doing so, to get the word out in this case, I am going to cross post this thread in a couple of other Yahoo related groups. Please excuse this if you come across the same posting elsewhere. i can assure you that I don't make a habit of doing this.

3. You are not making a commitment to buy. This is only to gauge if the interest is strong enough for Carl to invest one to two weeks work to add the DX-R8 to his software.

Jeff WB1AAL


Re: Tuned loop antenna

Gary DeBock
 

Hi Farmerik,

Yes, the PL-360's LW switching system seems designed by Rube Goldberg
himself, and it's probably best to have it all set up and running on
Longwave before heading for the beach.

Once in the middle of summer our ULR Co-founder, John Bryant, sent me
an urgent email from his ocean beach location, asking how to switch the
Sony SRF-T615 Ultralight from 10 kHz steps to 9 KHz steps for TP-DXing.
He had apparently arrived at Grayland all set to chase TP's, then
discovered that the tiny, $100 radio was stuck on 10 kHz steps, and
that he hadn't brought the manual to figure out how to switch it over
:-)

73, Gary

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Wed, Jun 29, 2011 12:00 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I am planning on spending a few days right on the beach in Maine again
this Fall, and will bring it with me. Last year for some unknown reason
the '360 would not switch to receive LW while I was there, although I
have not had that problem at any other time before or after that
vacation.

- FARMERIK

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

<<< I have pretty much given up trying for TA LW on a
ULR without an
amplified antenna. >>>

Hello Farmerik,
&gt;
For receiving Longwave TA's on an Ultralight radio, you might want
to
consider using your 7.5" LW plug-in loopstick with your PL-360
next
winter. Both Richard Allen (in Oklahoma) and Rob Ross (in Ontario)
have
received multiple Longwave TA's from Europe and Africa using such
an
antenna, and they are both a lot farther from the TA's (and the
Atlantic Ocean) than you.

73, Gary DeBock (in Puyallup, WA)

-----Original Message-----
From: farmerik <farmerik@...&gt;
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as
the
wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of
10-12
inches on both AM and LW. Mostly I was hoping for TA LW, but it
never
happened. Each coil acted differently, that is for sure. I have
pretty
much given up trying for TA LW on a ULR without an amplified
antenna.
Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380
regarding
soft mute? I thought it was the other way around, but I can easily
be
confused.

--- In ultralightdx@..., Rick Robinson w4dst@
wrote:

Hi Nick,

If you are handy with a soldering iron, the PL-310 is very
simple
to
modify for external antennas. See the group files section
for the
&gt; "Laurie" mod to the PL-310. The PL-380 mod is more involved
but
is a
better radio due to its lack of extreme soft mute and AGC
issues
that
the '310 has. I have modified my '310 and 2 '380s for use
with
external
antennas. The Si4734 will tune any antenna in the 180uH to
400uH
range
with its built-in 500pf - 20pF varactor. No need to purchase
bulky
tuning capacitors, it's all in the radio. I used 1/8" stereo
jacks on
my PL-380s, and depending on the type of jack you use,you can
keep
the
&gt; > internal ferrite bar in place and usable when the external
antenna
is
not being used.

I use a 24 inch spiral wound loop antenna with an inductance
of
260uH
with my ULRs. BTW, a spiral wound loop has much sharper
peaks and
nulls
than ferrite bar and "box wound" loops and is much quieter
than
ferrite
bar antennas. However it is somewhat more difficult to
construct
than a
"box wound" loop and is not as easily transported as a
ferrite bar.

I've been using these modified ULRs for almost a year with no
problems
at all. The Si4734 is a robust chip and does an excellent
job of
tuning
external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:
Hi,
&gt; > I've looked at some of the amazing ferrite rod antennas
for
ultralights.

Has anybody tried a tuned loop antenna in place of the
ferrite rod, letting the si4734 do the tuning rather than a
capacitor
on the loop? I have a large hexagonal loop and I'm considering
mounting
the PL-380 on the loop frame itself, disconnecting the internal
ferrite.

Nick.
&gt; >


Re: Tuned loop antenna

Rik
 

I am planning on spending a few days right on the beach in Maine again this Fall, and will bring it with me. Last year for some unknown reason the '360 would not switch to receive LW while I was there, although I have not had that problem at any other time before or after that vacation.


- FARMERIK

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

<<< I have pretty much given up trying for TA LW on a ULR without an
amplified antenna. >>>

Hello Farmerik,

For receiving Longwave TA's on an Ultralight radio, you might want to
consider using your 7.5" LW plug-in loopstick with your PL-360 next
winter. Both Richard Allen (in Oklahoma) and Rob Ross (in Ontario) have
received multiple Longwave TA's from Europe and Africa using such an
antenna, and they are both a lot farther from the TA's (and the
Atlantic Ocean) than you.

73, Gary DeBock (in Puyallup, WA)

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as the
wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of 10-12
inches on both AM and LW. Mostly I was hoping for TA LW, but it never
happened. Each coil acted differently, that is for sure. I have pretty
much given up trying for TA LW on a ULR without an amplified antenna.
Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380 regarding
soft mute? I thought it was the other way around, but I can easily be
confused.

--- In ultralightdx@..., Rick Robinson w4dst@
wrote:

Hi Nick,

If you are handy with a soldering iron, the PL-310 is very simple
to
modify for external antennas. See the group files section for the
"Laurie" mod to the PL-310. The PL-380 mod is more involved but
is a
better radio due to its lack of extreme soft mute and AGC issues
that
the '310 has. I have modified my '310 and 2 '380s for use with
external
antennas. The Si4734 will tune any antenna in the 180uH to 400uH
range
with its built-in 500pf - 20pF varactor. No need to purchase
bulky
tuning capacitors, it's all in the radio. I used 1/8" stereo
jacks on
my PL-380s, and depending on the type of jack you use,you can keep
the
internal ferrite bar in place and usable when the external antenna
is
not being used.

I use a 24 inch spiral wound loop antenna with an inductance of
260uH
with my ULRs. BTW, a spiral wound loop has much sharper peaks and
nulls
than ferrite bar and "box wound" loops and is much quieter than
ferrite
bar antennas. However it is somewhat more difficult to construct
than a
"box wound" loop and is not as easily transported as a ferrite bar.

I've been using these modified ULRs for almost a year with no
problems
at all. The Si4734 is a robust chip and does an excellent job of
tuning
external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:
Hi,

I've looked at some of the amazing ferrite rod antennas for
ultralights.

Has anybody tried a tuned loop antenna in place of the
ferrite rod, letting the si4734 do the tuning rather than a capacitor
on the loop? I have a large hexagonal loop and I'm considering mounting
the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.


SiLabs Chip Add-on for Arduino Boards

Guy Atkins
 

Saw this on a YG I belong to, and thought it may be of interest to some:


radio on a chip

Posted by: "Ralph Brandi" dxplorer@...   ralph.brandi

Wed Jun 29, 2011 3:43 am (PDT)



I've been playing with Arduino microprocessing boards lately, making 
LEDs blink, that sort of thing. One thing I've been trying (and failing) 
to do is to use an Arduino to build a radio around the Si4735 
radio-on-a-chip from Silicon Labs. I was on the site of Sparkfun 
Electronics last night and noticed that they've created a shield (in 
Arduino language, that's an add-on board that piggybacks on top of the 
Arduino board) with an Si4735 on it. So I ordered one.

http://www.sparkfun.com/products/10342

The chip is roughly the same one used in some of the most recent 
ultralight radios from companies like Degen and Tecsun. It has a 
surprising number of features, like multiple filters from 1kHz to 6kHz.

I hope to have the board sometime next week. I'll let you know what I 
think of it once I get it running.

---------------------------------------------

Guy Atkins
Puyallup, WA USA


Re: Mexican Stations

Stephen Ponder <stephen_ponder@...>
 

Ginger,

I really like Fred Cantu's website ...

http://mexicoradiotv.com/frec_am.htm

He's located in San Antonio, Texas, and has a pretty good edge on Mexican AM stations.  You'll see the underlined links to advance to the other sections of his list - AM 800-1090, AM 1100-1390, and AM 1400-1700.

Dig around some on his website - he also has FM and TV stations by "estado" (state).  It's a super-easy way to familiarize youself with the 32 separate states (including the Distrito Federal) that comprise the country of Mexico!

You can also use the FCC's AM Query page, but it takes a little more time and patience, especially in determining the style of output and then interpreting the output!

http://transition.fcc.gov/mb/audio/amq.html

Hope this helps!

73,
 
Stephen H. Ponder, N5WBI
Houston, Texas, USA - EL29kn
E-Mail:
stephen_ponder@...






From: "ginger_92@..."
To: ultralightdx@...
Sent: Wed, June 29, 2011 12:53:39 PM
Subject: [ultralightdx] Mexican Stations

 

Is there a website that gives freq's, call signs, content ect for Mexican radio stations. I can't seem to find one, I know I'm picking up a few frequently but all I ever seem to hear is Radio National or something like that, my spanish is very weak. I use a Kaito 1103 as a spotter so exact freq is not a problem. I also know I have picked up a Cuban MW as they say CUBA a lot also.

Ginger, OKC


Re: Mexican Stations

Kevin Raper
 

On Jun 29, 2011, at 1:53 PM, ginger_92@... wrote:

Is there a website that gives freq's, call signs, content ect for Mexican radio stations
http://radio-locator.com/ has most of them.

73,
Kevin Raper
KJ4HYD
CE WCKI WQIZ WLTQ

There is no limitation to the fidelity of AM radio. From a mathematical standpoint, AM does better in frequency response than FM. - Leonard Kahn


Re: Mexican Stations

Neil Goldstein
 

On Wed, Jun 29, 2011 at 1:53 PM, ginger_92@... <ginger_92@...> wrote:
 

Is there a website that gives freq's, call signs, content ect for Mexican radio stations. I can't seem to find one, I know I'm picking up a few frequently but all I ever seem to hear is Radio National or something like that, my spanish is very weak. I use a Kaito 1103 as a spotter so exact freq is not a problem. I also know I have picked up a Cuban MW as they say CUBA a lot also.

Ginger, OKC




--
Neil Goldstein
http://www.neilgoldstein.com


Mexican Stations

ginger_92@rocketmail.com
 

Is there a website that gives freq's, call signs, content ect for Mexican radio stations. I can't seem to find one, I know I'm picking up a few frequently but all I ever seem to hear is Radio National or something like that, my spanish is very weak. I use a Kaito 1103 as a spotter so exact freq is not a problem. I also know I have picked up a Cuban MW as they say CUBA a lot also.

Ginger, OKC


Re: Tuned loop antenna

Gary DeBock
 

<<< I have pretty much given up trying for TA LW on a ULR without an
amplified antenna. >>>

Hello Farmerik,

For receiving Longwave TA's on an Ultralight radio, you might want to
consider using your 7.5" LW plug-in loopstick with your PL-360 next
winter. Both Richard Allen (in Oklahoma) and Rob Ross (in Ontario) have
received multiple Longwave TA's from Europe and Africa using such an
antenna, and they are both a lot farther from the TA's (and the
Atlantic Ocean) than you.

73, Gary DeBock (in Puyallup, WA)

-----Original Message-----
From: farmerik <farmerik@...>
To: ultralightdx <ultralightdx@...>
Sent: Tue, Jun 28, 2011 1:55 pm
Subject: [ultralightdx] Re: Tuned loop antenna

 
I would like to hear more about your spiral loop antenna, such as the
wire you used, and the spacing between turns.

I also experimented with diamond weave and rook wound coils of 10-12
inches on both AM and LW. Mostly I was hoping for TA LW, but it never
happened. Each coil acted differently, that is for sure. I have pretty
much given up trying for TA LW on a ULR without an amplified antenna.
Now I am more interested in AM BCB. - FARMERIK

P.S. - Was that a typo about the 310 being worse than the 380 regarding
soft mute? I thought it was the other way around, but I can easily be
confused.

--- In ultralightdx@..., Rick Robinson <w4dst@...>
wrote:

Hi Nick,
&gt; If you are handy with a soldering iron, the PL-310 is very simple
to
&gt; modify for external antennas. See the group files section for the
"Laurie" mod to the PL-310. The PL-380 mod is more involved but
is a
&gt; better radio due to its lack of extreme soft mute and AGC issues
that
&gt; the '310 has. I have modified my '310 and 2 '380s for use with
external
antennas. The Si4734 will tune any antenna in the 180uH to 400uH
range
with its built-in 500pf - 20pF varactor. No need to purchase
bulky
tuning capacitors, it's all in the radio. I used 1/8" stereo
jacks on
my PL-380s, and depending on the type of jack you use,you can keep
the
internal ferrite bar in place and usable when the external antenna
is
not being used.

I use a 24 inch spiral wound loop antenna with an inductance of
260uH
with my ULRs. BTW, a spiral wound loop has much sharper peaks and
nulls
than ferrite bar and "box wound" loops and is much quieter than
ferrite
bar antennas. However it is somewhat more difficult to construct
than a
"box wound" loop and is not as easily transported as a ferrite bar.

I've been using these modified ULRs for almost a year with no
problems
at all. The Si4734 is a robust chip and does an excellent job of
tuning
external MW antennas without use of external capacitors.

Good DXing,

Rick W4DST


On 6/27/2011 6:47 PM, g4irx_uk wrote:
Hi,

I've looked at some of the amazing ferrite rod antennas for
ultralights.

Has anybody tried a tuned loop antenna in place of the
ferrite rod, letting the si4734 do the tuning rather than a capacitor
on the loop? I have a large hexagonal loop and I'm considering mounting
the PL-380 on the loop frame itself, disconnecting the internal ferrite.

Nick.


Re: SRF-M37W curiosity

Antonios Kekalos <akekalos@...>
 

I have two m37W and there is no change in the battery indicator switching between AM/FM/WX on either unit.


On Wed, Jun 29, 2011 at 8:18 AM, Richard Allen <richarda@...> wrote:
 

I own several M37V/W receivers and there is no change in the battery indicator switching from AM to FM bands. 
 
Good DX.
 
Richard.
 
Richard Allen
36°22'51"N / 97°26'35"W
(near Perry OK USA)




--
Tony, N4RNI
Traverse City, MI

Not every conspiracy is a theory-AMC's Rubicon
If you don't stand for something, you will fall for anything-Malcolm X



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