Date   

Some new Cubans, and a surprise

jim_kr1s <jkearman@...>
 

Operation Bay of Sigs continues. There are 76 Cuban stations in the log (23% of my ULR total) or, as Glen Hauser would say, I have reached the semi-sesqui-centurian-plus-one level. Not sure the last 24 are possible from here, but braced with 8 oz of espresso I hit the beach, err, band at 1000Z today. That's 5 a.m. local time. This coincided with sunrise over Guantanamo, eastern Cuba, and the plan was to catch some daytime-only Cubans as they came on the air. Last night, map in one hand, WRTH in the other, I plotted a few, east-to-west, by province. Operation BoS does not lack for planning! It paid off, with two new R Rebeldes in Guantanamo province right away on 550 and 580, and a R Progreso in Santa Clara on 680 and a R Sagua (after the city of Sagua La Grande, birthplace of former U.S. senator from Florida Mel Martinez) in Villa Clara on 1540 a while later.

But something else turned up as well. The ubiquitous R Enciclopedia was missing from 530! In its place could only have been a U.S. propaganda station, perhaps airborne. Here's a short recording: http://kearman.com/images/530-022510-0958Z.mp3  I'm counting this as a logged station, but not for any geographic location, as it was probably an airplane. It faded into the noise about 1027Z; when I checked 530 later, R Enciclopedia was booming in.

As usual, PL-380 with modified internal loop, not that you need a great antenna to hear Cuba from Florida! The espresso maker is by far the more-useful accessory.

73,

Jim, KR1S
http://qrp.kearman.com/ 


Re: Congratulations (again) to Chris Knight-- Ultralight TP and TA DXer!

Chris Knight <chris@...>
 

At this altitude a modest intake of a good Cabernet would improve a lot more
than a S/N ratio!

You stand a better chance of "Oz" in FL than most other eastern states.
April-May would be probably be the best months to try for them.

73,

Chris

Chris Knight (N0IJK)
Fort Lupton, Colorado
http://sites.google.com/site/ftluptonulrlogs/

-----Original Message-----
From: ultralightdx@... [mailto:ultralightdx@...] On
Behalf Of jim_kr1s
Sent: Wednesday, February 24, 2010 7:27 PM
To: ultralightdx@...
Subject: [ultralightdx] Re: Congratulations (again) to Chris Knight--
Ultralight TP and TA DXer!




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

Hello All,

Chris Knight of Fort Lupton, Colorado has amazed Rob Ross and me with
his superb DXing accomplishments this past season,
It's the thin air up in the Rockies. And I have it on his good authority
that modest intake of a good Cabernet prior to DXing greatly improves S/N
ratio!

The same does not seem to be true with TP's on the east coast, which
seem to elude almost all ULR DXers.
Yeah, but Saudi Arabia and UAE are about as far from the East Coast as
Japan is from the West Coast, and they count for Asia. Then we have Europe,
Africa and South America at lesser distances. We just need to wait a few
million years for Oz to slide a little closer.

73,

Jim, KR1S
http://qrp.kearman.com/


Re: Hacking the Si4734: two more PDFs

Roy <roy.dyball@...>
 

Silly Me

Thank you Scott for alerting me. The G8 I used to transcribe the circuit from was the one that got the giant EMP. The K16 I tested must have been damaged making it look like an NPN transistor when I tested it with my analog meter.

In fact it is actually a 2SK238-K16  N Channel FET. If you look at the PL-380 on the bottom of the board with components listed in a Square. Here it lists Q1 Q2 as a 2SK238 which is the 3 legged equivalent. The ICF7600GR also uses this device in the front end. I have redrawn the circuit.

Cheers Roy.


--- In ultralightdx@..., "just_rtfm" wrote:
>
>
>
> hi Scott,
>
> yes, with PNPs the SW enable activates the diode switch and applies Vcc to Q1 and Q2 emitters (via toroid).
>
> regards,
> phil :)
>


Re: Hacking the Si4734: two more PDFs

just_rtfm
 

hi Scott,

yes, with PNPs the SW enable activates the diode switch and applies Vcc to Q1 and Q2 emitters (via toroid).

regards,
phil :)


Re: Hacking the Si4734: two more PDFs

sdwillingham
 

Wow! Nice bit of work Roy. I see you've drawn it sort of in the style that it's laid-out on the PCB. I'm a little confused by the circuit at Q1 and Q2, however. I think that those may be PNP transistors, which then makes some sense to me. They would be configured as common-collector stages, i.e. emitter-followers, buffering the high-impedance whip antenna.

The marking K16 matches these parts:
http://www.rohm.com/products/databook/tr/pdf/dta144gua.pdf
which are PNP "digital" transistors. I'm assuming these are surface-mount devices.

Thanks for drawing it all out! I love to learn about all the ways radio designers do front-end circuits.

-Scott-

--- In ultralightdx@..., "Roy" <roy.dyball@...> wrote:


Hi Phil

I took the time to draw out the G8 front end. The PL-310 and PL380 are
similar but with more components in the filter. The same is true for an
02-2010 model PL-300 which has a redesigned front end/audio board
compared to the original G8. Feel free use the diagram if you want to.

Cheers Roy.


Re: Hacking the Si4734: two more PDFs

just_rtfm
 

howdy Roy,

thank you so much for the readings and your schematic! that is much more elaborate than the KK-D48L. i'm off to take a closer look.

regards,
phil :)


Re: Congratulations (again) to Chris Knight-- Ultralight TP and TA DXer!

jim_kr1s <jkearman@...>
 


--- In ultralightdx@..., D1028Gary@... wrote:
>
> Hello All,
>
> Chris Knight of Fort Lupton, Colorado has amazed Rob Ross and me with his
> superb DXing accomplishments this past season,

It's the thin air up in the Rockies. And I have it on his good authority that modest intake of a good Cabernet prior to DXing greatly improves S/N ratio!
 
> The same does not seem to be true with TP's on the east coast, which seem
> to elude almost all ULR DXers.

Yeah, but Saudi Arabia and UAE are  about as far from the East Coast as Japan is from the West Coast, and they count for Asia. Then we have Europe, Africa and South America at lesser distances. We just need to wait a few million years for Oz to slide a little closer.

73,

Jim, KR1S
http://qrp.kearman.com/ 


Re: Hacking the Si4734: two more PDFs

Roy <roy.dyball@...>
 

Hi Phil

I took the time to draw out the G8 front end. The PL-310 and PL380 are similar but with more components in the filter. The same is true for an 02-2010 model PL-300 which has a redesigned front end/audio board compared to the original G8. Feel free use the diagram if you want to.

Cheers Roy. 

--- In ultralightdx@..., "Roy" wrote:
>
>
> Hi Phil
>
> Having a look at the SW pre-amp/filter in the G8 there appears to be two
> transistors built around a small toroid transformer. To the right of
> that are the 2 transistors used to switch the (diode) signal onto the AM
> line. In the PL-380 the surface mount transistors for the filter/amp
> have been replaced with three leg non surface mount devices.
>
> Phil I finally had a chance to look at the capacitor values when set on
> SW. The programming manual recommends the varactor be set to 1 which
> means the capacitor will read 7.095pf for all frequencies above 1710Khz.
> But just for the heck of it I left it in automatic. Here is what it
> read.
>
> 2.3Mhz 141.6pf
> 5.0Mhz 25.25pf
> 8.0Mhz 11.56pf
> 8.5Mhz 7.095pf
>
> Cheers Roy.
>
>
> --- In ultralightdx@..., "just_rtfm" just_rtfm@ wrote:
> >
> > hi everyone,
> >
> > i added two more Si4734 PDFs to my site:
> >
> > 1) KK-D48L circuit description
> > 2) shortwave antenna musings
> >
> > http://home.comcast.net/~phils_radio_designs/index2.htm
> >
> > regards,
> > phil :)
> >
> > PS error reports welcomed
> >
>


MI LOG F I N A L L Y ! ! !

wa8lcz
 

Feb 24 Wen
1410 WDOV Dover Delaware 1730 EST 5k 5k newsradio 452 mi #250 state #34
**** ant pattern SE

I sat on 1410 for weeks, morning and night, copied 8 other stations PA OH PA CT KY NY MI IL until WDOV popped up out of the noise, a lot of noise, now he's in the log forever.


Byron wa8lcz nr Detroit Mi stations heard 250
Kenwood TS450S litz loop 34 in sq V2.0


Re: Time Signal???

Gil Stacy
 

One maddening aspect of Cuban stations is that the Cuban networks (Progresso, Rebelde, etc. )will often utilize feeds from Radio Reloj on other network frequencies that differ from what Jim posted. I commonly hear RR behind NOLA 870. However, hearing the "didahdit didahdit" makes it easy to id RR with just a bare hint of audio.
73 Gil


Re: Tecsun PL-310 rechargeable batteries

Rik
 

Rechargable cells might need to go through a few complete discharge and recharge cycles before they get up to full capacity. The SANYO cells are MUCH better, I use them all the time. They are much higher quality, and slow self discharge is MUCH better for radios you don't use too much. NiMH goes dead in a month or so weather you use it or not. - FARMERIK

--- In ultralightdx@..., <jfiglio1@...> wrote:

Get used to it, Kraig. That's our future! :-))

---- kg4lac <kg4lac@...> wrote:
Tony,
OK. Thanks. Wasn't sure as batteries mostly have Chinese writing on them.

73,

Kraig



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

Yahoo! Groups Links



Congratulations (again) to Chris Knight-- Ultralight TP and TA DXer!

Gary DeBock
 

Hello All,
 
Chris Knight of Fort Lupton, Colorado has amazed Rob Ross and me with his superb DXing accomplishments this past season, and has just been issued the following 4 Ultralight Award Certificates:
 
1) Ultralight TA-DXer, Unlimited Class (for reception of 747-Radio 5, Flevoland, Netherlands on 12-13-2009)
2) Ultralight TP-DXer, Unlimited Class (for reception of 693-JOAB, Tokyo, Japan on 1-22-2010)
3) Five Countries Heard, Unlimited Class
4) Three Continents Heard, Unlimited Class
 
Chris therefore becomes one of a select few DXers who have managed to receive both TA's and TP's on Ultralight radios from a single location, and should be congratulated for this. This accomplishment is rare, but seems to be much more common on the west coast than on the east coast (probably because of heavier QRM). Usually once or twice a DX season (recently), the "big gun" TA's like 1134-Croatia and 1575-Farda make a  decent appearance on the west coast, so that they may be weakly heard on barefoot Ultralight radios. The same does not seem to be true with TP's on the east coast, which seem to elude almost all ULR DXers. To my knowledge, the only east coast ULR-DXer able to receive a TP this past season was Brent Taylor (VY2HF) during a DXpedition to Priest Pond, PEI. His report of receiving 774-JOUB (Akita, Japan) on an SRF-59 inductively coupled to a Radio Shack loop is pasted below.
 
Congratulations again to Chris, and we thank him for his support of our Ultralight Awards program, honoring John Bryant's legacy.
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
 
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 com
_________________________________________________________________________________________
Brent Taylor's TP Reception:
 
  

Hello group,

I'm a recent member, but have owned an SRF-59 for over a year and played
with it on a few occasions.

This week, at the Priest Pond PEI DX-pedition (Canada) I heard full audio
from several Japanese stations, starting with JOUB, Akita, on my ICOM R75
while not using any outdoor aerials. In fact, I had the R75 wired directly
in to my tabletop Radio Shack passive loop. I used the loop to null the
splatter from WABC and got a great copy on an English lesson on the morning
of Tuesday, 6 October.

THEN, just for fun, I retrieved my SRF59 from my overnight bag and held it,
suspended from my hand inside the Radio Shack loop. With a monaural earphone
in my right ear, and my R75 delivering audio to my left ear through my
aviation-grade stereo headset (with the right ear disabled) I tuned the
SRF59 to see if I could recover any audio from JOUB.

Sure enough, after about 15 seconds of tuning up and down, I got a perfect
match between the R75 and the SRF59. Even the young girl's voice "My
grandfather LOVES astronomy." ha ha

I measured the distance on Google Earth and it comes out to about 6334
miles, or 10,193 kilometers.

I'm not a counter or record keeper, nor to I know the "official" ULR rules
as to external accessories, use of high-end spotting receivers, etc. But I
just thought I would let the group know of this particular catch.

That morning was my first TP run ever, from the Atlantic Coast of Canada,
and I was glad I could get it on the ultralight as well as the Icom. Most
amazing, I guess, was the fact it was the little Radio Shack loop delivering
RF to both of them. The other members of the group were hearing Japan also
on their Beverage, Flag and Delta loops outside, while I was getting
(clearer, albeit slightly weaker) copy from my indoor loop. The loop
effectively nulled the US northeast, leaving me with a virtually clear band.
The outdoor wire antennas still had lots of splatter from NY and Boston
stations.

The following day we added a fourth Japanese station, as well as two Koreans
and a tentative from China.

The DX-pedition has been a smashing success.

I have a Kchibo D96L on order and it has not yet arrived, so I may have to
try that one next time.

73 to all,

Brent Taylor, VY2HF
Stratford (and Priest Pond) PEI, Canada
FN86

report of receiving                        


Re: Congratulations to Chris Knight-- 30 Latin American Stations Heard

Kirk <kirk74601@...>
 

Chris,

Roger on the aurora. I've been trying to check propagation conditions in the afternoons or early evenings as well as the predictions. I think I may have missed a good opening recently...busy doing other things, you know how that goes. Of course the best way (for me anyway) is to turn on the radio and go exploring:) Good DX to ya!

Kirk Allen
Pasadena, TX

--- In ultralightdx@..., "Chris Knight" <chris@...> wrote:

It's beginning to slow down here a bit on the Latins. The Law of Diminshing
Returns could be kicking in. We just need a good Aurora.

73,

Chris


Re: Tecsun PL-310 rechargeable batteries

John A. Figliozzi
 

Get used to it, Kraig. That's our future! :-))

---- kg4lac <kg4lac@...> wrote:

Tony,
OK. Thanks. Wasn't sure as batteries mostly have Chinese writing on them.

73,

Kraig



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

Yahoo! Groups Links



Re: Time Signal???

Paul Robertson <probertson6@...>
 

Posting the frequencies of Radio Reloj confirmed what I was hearing. Many thanks to both you Jim and to Mark for quickly solving this puzzle for me.
 
 
Kind regards
 
Paul (VE3HFQ)
 
 


Florida recordings

jim_kr1s <jkearman@...>
 

Some recordings from last night, and one of Radio Reloj.

ZNS-3 810, Bahamas. This one should make you smile! http://kearman.com/images/ZNS-3_2300Z.mp3 

Croatia 1134 with news in EE, really booming in: http://kearman.com/images/croatia-1134-2320Z-022310.mp3

R Farda 1575, not too bad, either: http://kearman.com/images/Farda-0120Z-022410.mp3

PJB, TWR 800, back to regular programming: http://kearman.com/images/TWR_0200Z_022410.mp3

R Reloj 570 ID: http://kearman.com/images/R_Reloj_ID.mp3

Recorded with Sony ICD UX-70 on PL-380 with modified internal loop antenna, about 340 uH.

73,

Jim, KR1S
http://qrp.kearman.com/ 




Re: Tecsun PL-310 rechargeable batteries

Phil Pasteur
 

Thos sound just like the ones I got with the three different PL--310 radios that I have purchased. Yes they are NiMH rechargeable batteries. The best I could tell from the chinese markings is that they are rated for 2400 mAh. I tested the 9 that have gone through my hands. They ranged from about 1600 down to 1100 mAh. There was one that tested way low in each group of three. As they run in series, you will be limited by the one with the lowest capacity. I did not get acceptable run time with the provided batteries. I decided to just get rid of them and put some Eneloops in there that all were testing close to 2000 mAh. I get much better results now. Though it is a nice touch that they supply batteries, what you get doesn't seem to be very high quality. My recommendation would be to get some good name brand low self discharge cells like the Sanyo Eneloops to use in your new radio.

Phil

--- In ultralightdx@..., "kg4lac" <kg4lac@...> wrote:

New Tecsun PL-310 from China was supposed to include rechargeable batteries. 3 Tecsun QN1000m Size R6 1.2 volt batteries were included. Are these rechargeable? Or, are they regular batteries?

Thanks.

Kraig, KG4LAC


Re: Time Signal???

jim_kr1s <jkearman@...>
 


--- In ultralightdx@..., Paul Robertson wrote:
>
> It doesn't seem to matter the location. I hear it in Ontario as well as when
> in Florida so assume this would rule out the Cuban station.

Some of the R Reloj stations are strong and I'm sure you can hear them in Ontario. The double beep may be the didahdit didahdit "RR" every minute. Here are R Reloj frequencies commonly heard in So Florida.

 570

 790

 820

 830

 860

 930

 950

 960

 980

1020



> If an IF leak why just this time signal and not other IF mixings?

The PL-310 IF is very low, so not likely the problem.

73,

Jim, KR1S
http://qrp.kearman.com/ 


Re: Time Signal???

Paul Robertson <probertson6@...>
 

Here is an after thought. Does the Tecsun 310 happen to have a time "chip" in it to keep accurate time in the radio?  This would be the same let's say as an "atomic clock" that picks up a 60 Hz signal from a station such as WWV.  I wonder if this may be what I am hearing... anyone else hear the same time tones over a weak AM signal?
 
Paul (VE3HFQ)
 
 


MI LOG

wa8lcz
 

Feb 23 Tuesday
1410 WHLN Harlan KY 0655 EST 5k 41w oldies 390 mi #245
1360 WKYO Caro MI 0807 EST 1k 1k real country 70 mi #246
1460 CJOY or CKLY Guelph ONT 1710 EST 10k 5k oldies mi #247
==== the station uses ckly on air but cjoy is listed
1320 WKAN Kankakee IL 2040 EST 1k 500w country 260 mi #248
0850 KOA Denver CO 0723 EST (heard before) 1152 mi
0880 WZAB Sweetwater FL 0802 EST 4k 5k Imus in morning 995 mi #249

Did somebody say "BAND OPENING ?" WHOA !

Byron wa8lcz nr Detroit Mi stations heard 249
Kenwood TS450S litz loop 34 in sq and Sony SRF-M40W