Date   

Re: Is there a "lightweight class?" Sony SRF-T615

Camille LeBlanc
 

Hello Clyde,

TA means Trans Atlantic
TP means Trans Pacific

Listening for stations beyond or outside of the western hemisphere

In most cases these stations are on 9 KHz channel spacing vs the 10 KHz spacing we have in the Americas (North, Central and South)

Hope this answers your question.

Regards
Cam
--------------------------------------------

On Mon, 3/7/16, Clyde Smith hkryclyde@... [ultralightdx] <ultralightdx@...> wrote:

Subject: [ultralightdx] Re: Is there a "lightweight class?" Sony SRF-T615
To: "ultralightdx@..." <ultralightdx@...>
Received: Monday, March 7, 2016, 10:12 AM


 









forgive a stupid question but what are ta and tp
stations????

thanks clyde











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Re: Is there a "lightweight class?" Sony SRF-T615

Clyde Smith <hkryclyde@...>
 

forgive a stupid question but what are ta and tp stations????
thanks clyde


Re: Thai Score

Everett N4CY
 

Gary,

I again see that you fail to recognize any of my work and, or experiments with the FSL and other ferrite experiments. Rightly so Steve and Kevin should be given credit too, as they too did a lot of experiments with the FSL. All three of us made/did  a lot of experiments with different FSL configurations, communicating with each other, off list, each contributing to the final product. I don't proclaim to be an expert, however, I put in many hours of experimentation operating under the "What If" and came up with many results that I believe were of value to the group, or some of the group. I is not just all about "Gary". 

 My conclusion, based on my experiments, is that 1/2" thick polyethylene foam is a better choice for a FSL and also in my Stacked Toroid Loop Stick experiments too. Using 1/2" foam gave a few more kHz of band coverage vs thinner foam, with no loss in performance. I also saw no loss in inductance using the same length of wire, however, there were a few less turns using 1/2" vs 1/4" foam. 

In some of my early experiments I used EVA foam and later found that it gave a little higher inductance vs the PE foam, for the same number of turns/length of wire, but could never see any difference in performance between the two foams. 

I buy my foam from The Foam Factory http://www.thefoamfactory.com/closedcellfoam/polyethylene.htmland use the 1/2" thick 2.1 # density.

Everett N4CY










On Mar 6, 2016, at 8:35 PM, D1028Gary@... [ultralightdx] <ultralightdx@...> wrote:

 

Hi Michael,
 
<<<   Any idea why some foam results in poorer performance?
Last year I tried a "knock-up" with old hotel-radio
ferrites, good litz (with and without a silver-plated
air-spaced variable C) and whatever was to hand. So maybe
the UK-sourced foam was part of the reason for disappointment.
Could it be that some foam has metallic content?
To try again, I would have to try foam from different
sources on a hit-and-miss basis. As LW and MW is dying
in Europe, I am reticent to risk too much outlay and will
probably return to a longer single ferrite rod and/or
1meter dia frame loop   >>>
 
The choice and thickness of the foam between an FSL's coil and its ferrite material is a major factor in determining an FSL's ultimate sensitivity. The 1/4" (6mm) thick Oatey foam is strong and resilient, and has provided excellent results in FSL antennas since 2011. Along with substitutions in the type of Litz wire and ferrite material, substitutions in the type of foam are not recommended if someone wishes to obtain the designed MW sensitivity in a hard-wired FSL Tecsun PL-380 project.
 
After the U.K.'s Graham Maynard published his original Ferrite Sleeve article in 2011 there was a torrent of experimentation here in the U.S. to determine the best possible components for maximum FSL sensitivity. Ferrite bars, ferrite rods, Litz wire, foam material, frame material and variable caps were all thoroughly investigated. Various brands of foam material were tested in various thicknesses, and the original FSL experimenters (Steve, Kevin and I) determined that a thickness of about 1/4" (6mm) was close to ideal for maximum sensitivity. In my own FSL's I settled on the Oatey foam as the ideal type because of its low cost, thickness and durability. I'm aware that this type of foam may be tough to track down in foreign countries, but is a DXer is very serious about building the FSL-PL-380 model and needs the Oatey foam to complete his parts list, I'm very willing to send a pack of the foam for the cost of postage.
 
73, Gary DeBock (in Puyallup, WA, USA)
 
     
 
 
 
 
-----Original Message-----
From: Michael michael.setaazul@... [ultralightdx] <ultralightdx@...>
To: ultralightdx <ultralightdx@...>
Sent: Sun, Mar 6, 2016 6:24 am
Subject: Re: [ultralightdx] Re: Thai Score

 
Any idea why some foam results in poorer performance?
Last year I tried a "knock-up" with old hotel-radio
ferrites, good litz (with and without a silver-plated
air-spaced variable C) and whatever was to hand. So maybe
the UK-sourced foam was part of the reason for disappointment.
Could it be that some foam has metallic content?
To try again, I would have to try foam from different
sources on a hit-and-miss basis. As LW and MW is dying
in Europe, I am reticent to risk too much outlay and will
probably return to a longer single ferrite rod and/or
1meter dia frame loop

Michael

On 04.03.16 23:50, D1028Gary@... [ultralightdx] wrote:

> <<< I am in the process of gathering materials to build the 3 " FSL
> antenna, I am just wondering where you can buy the Oatey 4x4 foam closet
> spacers? >>>
> The Oatey 4" foam spacer material is sold at Home Depot stores within
> the USA, and is located in the plumbing section of such stores. It is
> extremely cheap, with a full roll of the material (good enough for 2 or
> 3 antenna jobs) costing just over $1.
> Because this material is so cheap and because it is actually quite
> important for proper FSL coil sensitivity, substitutions are not
> recommended. Already one DXer did a very good job in constructing his 3"
> FSL PL-380 model but used a different type of foam, and ended up with
> seriously reduced MW sensitivity as a result.


Re: Puyallup, WA Ultralight TP's for 3-2

Gary DeBock
 

 Hello Again Mark,
 
 <<<   I've heard past FSL airchecks.  Have you made any with the new DC FSL?   >>>
 
Yes, the following TP-DX recordings were direct comparisons between reception on an inductively coupled 15" FSL (on a C.Crane Skywave model) and a directly-connected 3" FSL on the Tecsun PL-380 model. You can hear the difference in audio quality between the two setups (although the PL-380 typically has somewhat of a background tone thrown in, as an Si47434 DSP chip side effect):
 
594-JOAK  (7.5" loopstick C.Crane Skywave, inductively coupled to a 15" FSL antenna)  Japanese male speech at 1410
594-JOAK  (3" FSL Tecsun PL-380 model, barefoot)  Same Japanese male speech at 1410
 
603  China  (Hulun Buir?)  Fair Chinese female speech at 1410 (CC Skywave and 15" FSL)
603  China  (Hulun Buir?)  Same signal on the "barefoot" 3" FSL Tecsun PL-380 handheld model
 
603  HLSA  Namyang, S. Korea  Korean vocal music dominating over China at 1427 (CC Skywave and 15" FSL)
603  HLSA  Namyang, S. Korea  Same signal on the "barefoot" 3" FSL Tecsun PL-380
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 
 
  
 
 

-----Original Message-----
From: mdh@... [ultralightdx]
To: ultralightdx
Sent: Sun, Mar 6, 2016 10:10 am
Subject: Re: [ultralightdx] Puyallup, WA Ultralight TP's for 3-2

 
I've heard past FSL airchecks.  Have you made any with the new DC FSL?


Re: Thai Score

Gary DeBock
 

Hi Michael,
 
<<<   Any idea why some foam results in poorer performance?
Last year I tried a "knock-up" with old hotel-radio
ferrites, good litz (with and without a silver-plated
air-spaced variable C) and whatever was to hand. So maybe
the UK-sourced foam was part of the reason for disappointment.
Could it be that some foam has metallic content?
To try again, I would have to try foam from different
sources on a hit-and-miss basis. As LW and MW is dying
in Europe, I am reticent to risk too much outlay and will
probably return to a longer single ferrite rod and/or
1meter dia frame loop   >>>
 
The choice and thickness of the foam between an FSL's coil and its ferrite material is a major factor in determining an FSL's ultimate sensitivity. The 1/4" (6mm) thick Oatey foam is strong and resilient, and has provided excellent results in FSL antennas since 2011. Along with substitutions in the type of Litz wire and ferrite material, substitutions in the type of foam are not recommended if someone wishes to obtain the designed MW sensitivity in a hard-wired FSL Tecsun PL-380 project.
 
After the U.K.'s Graham Maynard published his original Ferrite Sleeve article in 2011 there was a torrent of experimentation here in the U.S. to determine the best possible components for maximum FSL sensitivity. Ferrite bars, ferrite rods, Litz wire, foam material, frame material and variable caps were all thoroughly investigated. Various brands of foam material were tested in various thicknesses, and the original FSL experimenters (Steve, Kevin and I) determined that a thickness of about 1/4" (6mm) was close to ideal for maximum sensitivity. In my own FSL's I settled on the Oatey foam as the ideal type because of its low cost, thickness and durability. I'm aware that this type of foam may be tough to track down in foreign countries, but is a DXer is very serious about building the FSL-PL-380 model and needs the Oatey foam to complete his parts list, I'm very willing to send a pack of the foam for the cost of postage.
 
73, Gary DeBock (in Puyallup, WA, USA)
 
     
 
 
 
 

-----Original Message-----
From: Michael michael.setaazul@... [ultralightdx]
To: ultralightdx
Sent: Sun, Mar 6, 2016 6:24 am
Subject: Re: [ultralightdx] Re: Thai Score

 
Any idea why some foam results in poorer performance?
Last year I tried a "knock-up" with old hotel-radio
ferrites, good litz (with and without a silver-plated
air-spaced variable C) and whatever was to hand. So maybe
the UK-sourced foam was part of the reason for disappointment.
Could it be that some foam has metallic content?
To try again, I would have to try foam from different
sources on a hit-and-miss basis. As LW and MW is dying
in Europe, I am reticent to risk too much outlay and will
probably return to a longer single ferrite rod and/or
1meter dia frame loop

Michael

On 04.03.16 23:50, D1028Gary@... [ultralightdx] wrote:

> <<< I am in the process of gathering materials to build the 3 " FSL
> antenna, I am just wondering where you can buy the Oatey 4x4 foam closet
> spacers? >>>
> The Oatey 4" foam spacer material is sold at Home Depot stores within
> the USA, and is located in the plumbing section of such stores. It is
> extremely cheap, with a full roll of the material (good enough for 2 or
> 3 antenna jobs) costing just over $1.
> Because this material is so cheap and because it is actually quite
> important for proper FSL coil sensitivity, substitutions are not
> recommended. Already one DXer did a very good job in constructing his 3"
> FSL PL-380 model but used a different type of foam, and ended up with
> seriously reduced MW sensitivity as a result.


Is there a "lightweight class?" Sony SRF-T615

Les Rayburn
 

This morning, I was attempting to troubleshoot some problems with another portable. I ended up doing a backyard performance test of several portables just to establish baseline. 

The targets for testing were: 

WSM, Nashville 650 AM. About 200 miles distant. Their 50KW signal means they are a fairly easy daytime DX target. 
WJOX, Birmingham 690 AM. Local pest station. Their 50KW signal means wall to wall signal. 

Test were conducted outside the house, in the quietest spot in my suburban RF hell. 

Radios tested were: 

Sangean PR-D5
Tecsun PL-380
CC Crane Skywave
Sony SRF-T615

The results were interesting. The clear winner was the heavyweight Sangean PR-D5. WSM was easy copy. Not armchair strength but certainly strong enough to listen to a game or your favorite song. With the local, it could null their signal deep enough to allow traces of another station underneath. 

Second would have been the CC Skywave (on 1KHz bandwidth setting). Able to copy WSM well enough to pick out a song or ID. Deep null on WJOX but not deep enough to completely bury the signal. 

The Tecsun PL-380 received WSM about as well as the slightly smaller Skywave, but could not achieve quite as deep a null. Again, using the 1KHz bandwidth. 

Then the lightweight of the division, a true ultralight. The Sony SRF-T615 could not detect any audio from WSM 650 but did achieve the 2nd best null on local WJOX. It put their signal into the mud, almost completely gone. At night, this ability comes in very handy. 

When it comes to performance, I wonder if we’re not also “weighting” results based on those seeking TA and TP targets. Searching for those stations, the 1KHz DSP bandwidth is critical for success, but for those chasing domestic targets, it’s not as much of a factor. 

The Sangean PR-D5 has a fixed bandwidth and beautiful sound. It’s big and heavy compared to the others but it’s a great radio for AM DXing. 

The Sony SRF-T615 is a true ultralight, fitting easily into a shirt pocket. Used with headphones, it’s a wonderful machine to take when walking the dogs. Searching for domestics, both are quite capable. The Tecsun and Skywave are probably better choices for DXing TA and TP targets. 

Fun test. Should have thought of it sooner. All of these have been in the house for months or years. Maybe we need weight classes or two scales—one for TA/TP Performance and another for Domestics. 




73,

Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 
EM63nf

Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA. 

Elad FDM-S2 SDR, AirSpy SDR, Quantum Phaser, Wellbrook ALA1530 Loop, Wellbrook Flag, Clifton Labs Active Whip. 



Re: Puyallup, WA Ultralight TP's for 3-2

Mark/airchecklover
 

I've heard past FSL airchecks.  Have you made any with the new DC FSL?


Re: Thai Score

Michael <michael.setaazul@...>
 

Any idea why some foam results in poorer performance?
Last year I tried a "knock-up" with old hotel-radio
ferrites, good litz (with and without a silver-plated
air-spaced variable C) and whatever was to hand. So maybe
the UK-sourced foam was part of the reason for disappointment.
Could it be that some foam has metallic content?
To try again, I would have to try foam from different
sources on a hit-and-miss basis. As LW and MW is dying
in Europe, I am reticent to risk too much outlay and will
probably return to a longer single ferrite rod and/or
1meter dia frame loop

Michael

On 04.03.16 23:50, D1028Gary@... [ultralightdx] wrote:

<<< I am in the process of gathering materials to build the 3 " FSL
antenna, I am just wondering where you can buy the Oatey 4x4 foam closet
spacers? >>>
The Oatey 4" foam spacer material is sold at Home Depot stores within
the USA, and is located in the plumbing section of such stores. It is
extremely cheap, with a full roll of the material (good enough for 2 or
3 antenna jobs) costing just over $1.
Because this material is so cheap and because it is actually quite
important for proper FSL coil sensitivity, substitutions are not
recommended. Already one DXer did a very good job in constructing his 3"
FSL PL-380 model but used a different type of foam, and ended up with
seriously reduced MW sensitivity as a result.


Sangean ATS-405 & 500 foot ENE BOG from CT USA

Rik
 


Recently acquired a Sangean ATS 405  radio. I did a scan for DX on MW this evening logging only stations not heard regularly, and skipping foreign languages and Sports stations. Approx. 8-10 PM local time Connecticut. 500 foot unterminated BOG ENE coupled with CCrane ferrite ant coupler.

1700 WRCR NY 112 mi 1 KW
1580 CKDO Oshawa ON 358 mi 10 KW
1320 WJNJ Jacksonville FL 964 mi 5 KW
1220 WHKW Cleveland OH 493 mi 50 KW
1120 KMOX St. Louis MO 965 mi 50 KW
1040 WCHR Flemington.NJ 177 mi 1.5 KW
720 WGN Chicago IL 813 mi 50 KW
620 WZON Bangor ME 261 mi 5 KW
590 WEZE Boston MA 63 mi 5 KW
550 WSJW Pawtucket RI 40 mi 0.5 KW
540 CBT Grand Falls NL 932 mi 10 KW


FARMERIK in CT



Re: 600 Watt Station received @ 150 Miles with new 3"FSL

Gary DeBock
 

<<<   The amazing reception qualities of the modified 3" FSL Antenna were revealed this afternoon when 600 Watt Fox Sports Station KKXL - Grand Forks North Dakota  150 miles distant from Winnipeg, Manitoba was received for most of the afternoon daytime hours.  Signal levels were very good and listenable (1 kHz filter used) - as high as 41/19 on the Tecsun PL-380 with the 3" FSL.  A comparison was made with a non modified Tecsun PL-380 whose anemic signal levels were inaudible  and topped out at 14/00.  This is a testament as to how good this new design by Gary DeBock is. Will try to post pictures in the Album Section.   >>> 
 
Thanks for the amazing report, Jerry.
 
There is something very weird about how these "Science Fiction PL-380" models are performing in weak-signal DX. Almost weird enough to look for the aliens that dropped them off?? This morning one of the models was staying pretty close to a CC Skywave + 15" FSL antenna combination in weak-signal TP-DXing...  a $95 hot-rodded pocket radio acting like stiff competition for a $1000+ combo. Yikes!
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 
 
 

-----Original Message-----
From: jerry_popiel@... [ultralightdx]
To: ultralightdx
Sent: Sat, Mar 5, 2016 4:11 pm
Subject: [ultralightdx] 600 Watt Station received @ 150 Miles with new 3"FSL

 
The amazing reception qualities of the modified 3" FSL Antenna were revealed this afternoon when 600 Watt Fox Sports Station KKXL - Grand Forks North Dakota  150 miles distant from Winnipeg, Manitoba was received for most of the afternoon daytime hours.  Signal levels were very good and listenable (1 kHz filter used) - as high as 41/19 on the Tecsun PL-380 with the 3" FSL.  A comparison was made with a non modified Tecsun PL-380 whose anemic signal levels were inaudible  and topped out at 14/00.  This is a testament as to how good this new design by Gary DeBock is. Will try to post pictures in the Album Section. 


Puyallup, WA Ultralight TP's for 3-5

Gary DeBock
 

It was an excellent Asian morning on the low band during sunrise enhancement today, with several less common TP's coming out of the noise to reach fair levels. 603-China and 657-Pyongyang (with a weak TP co-channel) were the main attractions early on around 1410, but 639-CNR1 and 738-BEL2 (presumed) also joined them after 1430. 603-HLSA also came out of the noise around 1425 to dominate China for the rest of the session. The combination of relatively obscure TP's and competing receiver/ antenna setups (the CC Skywave inductively boosted by a 15" FSL, and a "barefoot" 3" FSL Tecsun PL-380 model) made for an exciting morning. The "Science Fiction PL-380" once again proved that it is pretty competitive in all-out TP-DXing, managing a surprising reception of 603-China at 1410-- hardly routine DX on a hand-held portable far from the ocean.
 
My session started off at 1355 with the Asian propagation already in full swing, as both the Japanese big guns on 594, 693, 747 and 828 and the Korean regulars on 972 and 1566 set the pace with good signals in and out. 1593-CNR1 was also fair to good early on but fizzled quickly. Already the low band frequencies of 558, 603, 657 and 738 were managing audio, however, and these continued to become more interesting as daylight increased. 657-Pyongyang's elderly tirade woman was dominating a TP co-channel (Henan?) at 1408, while 603-China reached a fair level at 1410 all by itself. Although its signal wasn't exactly overpowering the Chinese female speech was clearly audible on the FSL-enhanced PL-380-- a major surprise. 639-CNR1 and a presumed 738-BEL2 also built up strength to fair levels shortly thereafter but were troubled by domestic splatter on both antenna setups.  603-HLSA took over the frequency from a fading China around 1425 but there was a low-level 603 mix for the duration of the propagation. Overall the morning was one of the best in recent memory, and it will be interesting to read the other reports.
 
603  China  (Hulun Buir?)  Fair Chinese female speech at 1410 (CC Skywave and 15" FSL)
603  China  (Hulun Buir?)  Same signal on the "barefoot" 3" FSL Tecsun PL-380 handheld model
 
603  HLSA  Namyang, S. Korea  Korean vocal music dominating over China at 1427 (CC Skywave and 15" FSL)
603  HLSA  Namyang, S. Korea  Same signal on the "barefoot" 3" FSL Tecsun PL-380
 
657  Pyongyang BS   Pyongyang, N. Korea   Elderly tirade woman shouting above more sedate co-channel (Henan?) at 1408
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick CC Skywave + 15" FSL
3" FSL Tecsun PL-380
 
 


600 Watt Station received @ 150 Miles with new 3"FSL

jerry_popiel
 

The amazing reception qualities of the modified 3" FSL Antenna were revealed this afternoon when 600 Watt Fox Sports Station KKXL - Grand Forks North Dakota  150 miles distant from Winnipeg, Manitoba was received for most of the afternoon daytime hours.  Signal levels were very good and listenable (1 kHz filter used) - as high as 41/19 on the Tecsun PL-380 with the 3" FSL.  A comparison was made with a non modified Tecsun PL-380 whose anemic signal levels were inaudible  and topped out at 14/00.  This is a testament as to how good this new design by Gary DeBock is. Will try to post pictures in the Album Section. 


Re: Combination Polydoroff and contra wound FSL

Camille LeBlanc
 

Hello Everett,

Thanks for the reply. I intended to use my FSL for both MW and LW, so I was hoping for both maximum sensitivity and wide frequency range. I might try some winding experiments using regular 20 AWG twisted wire. Like you pointed out Litz wire is just too expensive to cut up for the sake of experimentation with unknown results. I also just noticed an error in my original posting. The 4PDT switch should have read DPDT. However if I go the 3 coil route then the DPDT is out. I will give this some consideration before any winding methods are attempted. Thanks again Everett.

73
Cam VE9CAM
--------------------------------------------

On Sat, 3/5/16, Everett Sharp everettsharp@... [ultralightdx] <ultralightdx@...> wrote:

Subject: Re: [ultralightdx] Combination Polydoroff and contra wound FSL
To: ultralightdx@...
Received: Saturday, March 5, 2016, 7:20 AM


 









Hi Cam,
I am not sure if you
are if you are wanting to operate on one band, or dual
bands? If you are just wanting one band, MW, then stick with
all 4 coils wound in the same direction for a Polydroff
configuration. The reason for winding in coils in contra is
to reduce interaction between the coils. With a 12"
wide FSL you should have enough spacing between the coils
that there should be no interaction issues. 
If on the other hand if
you are wanting to make a multi-band configuration, then you
need to use 3 coils, wound in Contra. 2, or 4 coils do not
work out well. The only way I was ever able to get 2 coils
to work out well for a dual band FSL was to have cut the
ferrite bars into segments, which you can see in my article
"Experiments with a 7 1/2" FSL.  
Also you did mention
what wire you will be using, if it is Litz wire you are
better off going with the tried and proven, rather then wast
good wire on trying something that may, or may not
work. 
Everett N4CY
On Mar 4,
2016, at 10:22 PM, Camille LeBlanc camudx@...
[ultralightdx] <ultralightdx@...>
wrote:
















 






Hello Gang,



I just finished all the pre-wiring stages of my new FSL. It
will give about a 7 inch diameter coil and comprises of 3
rows of 47 each 100 mm ferrite rods for a total of length of
300 mm (12 inches) using 141 rods. Now before winding any
wire on this thing, and reading all the articles in the
files section, I got to thinking if anyone has ever had the
idea of combining both winding methods into one design. I
was thinking of two possibilities.



Possibility 1:

Coil 1 and 3 wound in one direction then coil 2 and 4 wound
contra. Coil 1 and 3 connected in Polydoroff fashion along
with coil 2 and 4 also connected with the Polydoroff method.
Each Polydoroff pair could be regarded as a single coil and
brought out to a 4PDT switch to allow for series/parallel
band switching.



Possibility 2:

Coil 1 and 2 connected in Polydoroff, then coil 3 and 4 also
connected in Polydoroff but coils 3 and 4 wound contra to
coils 1 and 2. Again each pair could be regarded as one
single coil and also switched by a 4PDT switch for band
switching.



It would seem to me that this combining of both winding
methods would give the best of both worlds and provide all
the desired advantages of both methods. Maybe I'm
missing something here because sometimes I get crazy ideas.
Does anyone know if either scheme would work?



Regards

Cam
























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Mid Afternoon Station Captures with new modified 3" FSL

jerry_popiel
 

Guys, today tried out the newly constructed 3" FSL for daytime AM Dxing and had some good results from my home base of Winnipeg, Manitoba  Canada.  

1) Station WNAX (5000 watts) - 570 kHz  in Yankton South Dakota - 536 miles distance - talk radio - was received at a signal level of 35/10 on the Tecsun PL-380 receiver.

2) Station CKRM (10,000 watts ) - 620 kHz in Regina Saskatchewan- 354 miles - mostly western music -was received at a signal level of 40/15.

3) Station KNOX (5000 watts) 1310 kHz in Bismarck, North Dakota - 150 miles - Basketball play by play was received at a local station level of 45/23. 

All station captures were received inside the house as the daytime temperatures were at -14 which is too cold for any extensive AM DXing outside. I will try to add photos of the reception captures. Thanks. 


Jerry


Re: Combination Polydoroff and contra wound FSL

Everett N4CY
 

Hi Cam,

I am not sure if you are if you are wanting to operate on one band, or dual bands? If you are just wanting one band, MW, then stick with all 4 coils wound in the same direction for a Polydroff configuration. The reason for winding in coils in contra is to reduce interaction between the coils. With a 12" wide FSL you should have enough spacing between the coils that there should be no interaction issues. 

If on the other hand if you are wanting to make a multi-band configuration, then you need to use 3 coils, wound in Contra. 2, or 4 coils do not work out well. The only way I was ever able to get 2 coils to work out well for a dual band FSL was to have cut the ferrite bars into segments, which you can see in my article "Experiments with a 7 1/2" FSL.  

Also you did mention what wire you will be using, if it is Litz wire you are better off going with the tried and proven, rather then wast good wire on trying something that may, or may not work. 

Everett N4CY


On Mar 4, 2016, at 10:22 PM, Camille LeBlanc camudx@... [ultralightdx] <ultralightdx@...> wrote:

 

Hello Gang,

I just finished all the pre-wiring stages of my new FSL. It will give about a 7 inch diameter coil and comprises of 3 rows of 47 each 100 mm ferrite rods for a total of length of 300 mm (12 inches) using 141 rods. Now before winding any wire on this thing, and reading all the articles in the files section, I got to thinking if anyone has ever had the idea of combining both winding methods into one design. I was thinking of two possibilities.

Possibility 1:
Coil 1 and 3 wound in one direction then coil 2 and 4 wound contra. Coil 1 and 3 connected in Polydoroff fashion along with coil 2 and 4 also connected with the Polydoroff method. Each Polydoroff pair could be regarded as a single coil and brought out to a 4PDT switch to allow for series/parallel band switching.

Possibility 2:
Coil 1 and 2 connected in Polydoroff, then coil 3 and 4 also connected in Polydoroff but coils 3 and 4 wound contra to coils 1 and 2. Again each pair could be regarded as one single coil and also switched by a 4PDT switch for band switching.

It would seem to me that this combining of both winding methods would give the best of both worlds and provide all the desired advantages of both methods. Maybe I'm missing something here because sometimes I get crazy ideas. Does anyone know if either scheme would work?

Regards
Cam


Combination Polydoroff and contra wound FSL

Camille LeBlanc
 

Hello Gang,

I just finished all the pre-wiring stages of my new FSL. It will give about a 7 inch diameter coil and comprises of 3 rows of 47 each 100 mm ferrite rods for a total of length of 300 mm (12 inches) using 141 rods. Now before winding any wire on this thing, and reading all the articles in the files section, I got to thinking if anyone has ever had the idea of combining both winding methods into one design. I was thinking of two possibilities.

Possibility 1:
Coil 1 and 3 wound in one direction then coil 2 and 4 wound contra. Coil 1 and 3 connected in Polydoroff fashion along with coil 2 and 4 also connected with the Polydoroff method. Each Polydoroff pair could be regarded as a single coil and brought out to a 4PDT switch to allow for series/parallel band switching.

Possibility 2:
Coil 1 and 2 connected in Polydoroff, then coil 3 and 4 also connected in Polydoroff but coils 3 and 4 wound contra to coils 1 and 2. Again each pair could be regarded as one single coil and also switched by a 4PDT switch for band switching.

It would seem to me that this combining of both winding methods would give the best of both worlds and provide all the desired advantages of both methods. Maybe I'm missing something here because sometimes I get crazy ideas. Does anyone know if either scheme would work?

Regards
Cam


Re: Thai Score

Gary DeBock
 

<<<  I am in the process of gathering materials to build the 3 " FSL antenna, I am just wondering where you can buy the Oatey 4x4 foam closet spacers?    >>>
 
The Oatey 4" foam spacer material is sold at Home Depot stores within the USA, and is located in the plumbing section of such stores. It is extremely cheap, with a full roll of the material (good enough for 2 or 3 antenna jobs) costing just over $1.
 
Because this material is so cheap and because it is actually quite important for proper FSL coil sensitivity, substitutions are not recommended. Already one DXer did a very good job in constructing his 3" FSL PL-380 model but used a different type of foam, and ended up with seriously reduced MW sensitivity as a result. If someone is unable to track this material down and seriously wants to build the model, I'm very willing to send an Oatey foam pack for the cost of postage. 
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 
 
 

-----Original Message-----
From: jga747@... [ultralightdx]
To: ultralightdx
Sent: Fri, Mar 4, 2016 7:22 am
Subject: [ultralightdx] Re: Thai Score

 
Gary,

I am in the process of gathering materials to build the 3 " FSL antenna, I am just wondering where you can buy the Oatey 4x4 foam closet spacers?


Re: Thai Score

Gary DeBock
 

Hello David,
 
<<<   Just to add that I had a surprise visit from this station on 28 February 2016 at 22:31 UTC here in Aberdeen, Scotland. I have been testing my new SANGEAN DT-250 and I was sitting on a very busy 1575 kHz in the late evening when suddenly in the midst of the mayhem came the familiar VOA 'Yankee Doodle' sig tune, followed by the VOA voice ID in English. A new programme then started in an UNID language and then quickly faded down never to return. I was assuming it would have been from the Sao Thome transmitter, but Allen Willie pointed out that on 1575 it is from Thailand! Pretty amazing for barefoot!   >>>
 
Wow, congratulations on your reception of 1575-VOA with your new, barefoot Sangean DT-250! That is an amazing reception, not only because of your distance from Thailand but also because most of it s over a land path.
 
Because of its powerful transmitter 1575-VOA is a fairly common catch on west coast ocean beaches here in North America, although the challenge goes up dramatically as you try for it at inland locations with a small portable.
 
<<<   So far, I am really liking the DT-250. Selectivity could be better, but it is streets ahead of my SONY SRF T-615 in that respect and it has given me a heap more pest-free channels.   >>>
 
Yes, selectivity is certainly not a strong point of the SRF-T615. Once I was pretty sure that I had received the Korean language 1566-HLAZ with it-- until I investigated a little further and found that it actually was splatter from my local Korean pest on 1450 :-)
 
73, Gary DeBock (in Puyallup, WA, USA)
 
 

    
 
 

-----Original Message-----
From: davidhenry02@... [ultralightdx]
To: ultralightdx
Sent: Fri, Mar 4, 2016 6:45 am
Subject: [ultralightdx] Re: Thai Score

 
Hi Gary,

Great stuff!!

Just to add that I had a surprise visit from this station on 28 February 2016 at 22:31 UTC here in Aberdeen, Scotland. I have been testing my new SANGEAN DT-250 and I was sitting on a very busy 1575 kHz in the late evening when suddenly in the midst of the mayhem came the familiar VOA 'Yankee Doodle' sig tune, followed by the VOA voice ID in English. A new programme then started in an UNID language and then quickly faded down never to return. I was assuming it would have been from the Sao Thome transmitter, but Allen Willie pointed out that on 1575 it is from Thailand! Pretty amazing for barefoot!

So far, I am really liking the DT-250. Selectivity could be better, but it is streets ahead of my SONY SRF T-615 in that respect and it has given me a heap more pest-free channels.

Cheers,
David Henry
Aberdeen, Scotland.


Re: Newfoundland Ultralight Radio Logs March 2-3

Rik
 

I wonder if the Atlantic to your east helped the signals from Oregon? I used to DX to the north by setting up on the south side of a lake. I never thought to try and see if the lake were 'behind' me, if that would help DXing too. I have found signals to travel along a river better than over land. - FARMERIK


Puyallup, WA Ultralight T's for 3-4

Gary DeBock
 

It was a pretty wild morning for Asian signals, with the low band sounding like something straight out of October. The usual regulars on 594, 693, 747, 828 and 972 all managed good strength at times, while several more obscure stations on 603, 639, 657 and 738 came out of the noise to reach fair levels.
 
My session started at 1410 with the Asian propagation already in full swing. 594-JOAK and 747-JOIB were leading the way with good signals, while both 603-HLSA and 657-Pyongyang (with martial music) were at fair levels. Around 1430 these were joined by 639-CNR1 (poor to fair) and 738-BEL2 (fair), while the Japanese big guns continued their potent runs on 594, 693 and 747. Around 1435 the 558 parallel of 603-HLSA was strong enough to identify with the same K-Pop song, and the 1035-CNR1 synchros showed up with their distinctive echoes. The high band once again featured 1575-VOA as the best performer, with both 1566 and 1593 staying at modest levels during sunrise enhancement.
 
Early on at 1410 I had a chance to record the exact same one minute segment of 594-JOAK on both the 3" FSL Tecsun PL-380 model ("barefoot") and the 7.5" loopstick C.Crane Skywave model inductively coupled to a 15" FSL antenna. The two setups were separated by about 25 feet so that they would not interact with each other. For some bizarre reason the "Science Fiction PL-380" was extremely competitive-- even to a shocking extent. The two one-minute MP3's are linked below.
 
594-JOAK  (3" FSL Tecsun PL-380 model, barefoot)  Japanese male speech at 1410
 
594-JOAK  (7.5" loopstick C.Crane Skywave, inductively coupled to a 15" FSL antenna)  Same Japanese male speech at 1410
 
603-HLSA  Namyang, S. Korea  Korean pop music at 1437 // 558
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave + 15" FSL antenna (except for the first 594 recording)
 
 

7881 - 7900 of 34091