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File : /5 Antennas and Equipment/Remote Tuned Loop16042015_0000.pdf
Uploaded by : tonyzl <tonyzl@ihug.co.nz>
Description : A simple circuit for remotely tuning a loop. 1996


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Re: Litz Loop question? - FARMERIK

josephrot
 

Quite a few things do not / should not mess with moderate HF, perhaps up to 500 MHz or somewhat higher...

- Teflon (aka Polytetrafluoroethylene (PTFE) )
- Polystyrene (aka cheap plastic used for years)
- Bakelite (old fashioned stuff used to be used on everything and coil forms, etc.)
- Polyethylene or components made from same
- Nylon
- RF and Voltage insulators made from the above or
Porcelain
- Fiberglas or components fashioned from same
- Very well cured (dry) varnished wood, especially thin stock coated in polyurethane has been seen to work pretty well.

The above obviously not complete...

Unless you really need something BIG, strongly prefer to cut by hand or LOW  vibration sharp sabre saw, moto-tool, etc.

RE: <<  Masonite...hard to find...>>

Among other things, look at some of the hardware / building stores back splash panels, some with man-made tile-like hard finishes on one side. They will work, as all that most of them are is coated Masonite, sometimes also water-proofed too.


Yes, we have also used non-ferrous metal / plastic embroidery hoops from stores, eBay, Amazon, you name it for smaller loop antennas, seems to work just fine.

Joe Rotello / Knoxville, TN / USA
Skype: joerotello


Re: Litz Loop question? - FARMERIK

Rik
 

Does anyone know of a list of materials least likely to interfere with radio waves close to a [loop] antenna?

I realize ferrous metal would be really bad. I can't seem to find Masonite at building supply stores. My understanding is wood should be sealed so it can not absorb moisture. I have had trouble drilling holes in some kind of clear plastic. I believe somewhere related to Regen or Crystal radios I saw a list of the best sorts of plastic to use for large coupling coil forms, but that was a long time ago now.

I would need something which can be bought already cut to size or something which can be cut with a hand held circular saw.

I think the embroidery hoop  would be ideal if I can get one close enough in diameter to fit over the loop.It would be in the null, rather than using a flat sheet of material on one or both sides of the loop.

Nylon bolts and nuts would be good or glue instead of metal fasteners, although aluminium, copper  or pure brass may be OK.

-FARMERIK


Re: Litz Loop question? - FARMERIK

John Bruckner
 

Rik and all:

 

The coil will stand on its own, but will need something as you suggest, to keep from rolling off the desk.

 

John

 

From: ultralightdx@... [mailto:ultralightdx@...]
Sent: Tuesday, April 14, 2015 5:30 PM
To: ultralightdx@...
Subject: Re: [ultralightdx] Litz Loop question? - FARMERIK

 

 

I just ordered the 13.50 inch in 660/46 Litz which measures at 277 uH and John plans to ship it tomorrow Priority Mail. He says it may need some physical support, so maybe I can find a Embroidery loop or box it inside a thin wood frame with a base for mounting a tuning cap. Once here I can take measurements and look for something. My goal is a very sensitive but still portable and light weight loop to couple to portables.- FARMERIK


Re: Litz Loop question? - FARMERIK

Rik
 

I just ordered the 13.50 inch in 660/46 Litz which measures at 277 uH and John plans to ship it tomorrow Priority Mail. He says it may need some physical support, so maybe I can find a Embroidery loop or box it inside a thin wood frame with a base for mounting a tuning cap. Once here I can take measurements and look for something. My goal is a very sensitive but still portable and light weight loop to couple to portables.- FARMERIK


Re: Litz Loop question? - FARMERIK

Steve Ratzlaff
 

The bigger the Litz the better the performance no matter what diameter loop. Go with 660/46, given the choice.

(I ordered a loop like yours, and I just received my 9.25" loop yesterday from John--he gave me a choice of 175/46 or 660/46 with only a modest increase in price for the bigger Litz. It was a no-brainer to go with 660/46. Boy it's a beautiful coil! I haven't had time yet to play with it.)
Steve

On 4/14/2015 6:01 AM, farmerik@... [ultralightdx] wrote:
 

What variety of Litz wire would be best for an indoor AM loop of maybe 13-14 inches in diameter? John, who made my custom loops which work so well stocks 175/46 and 660/46 but I have no idea which to ask for.-FARMERIK




Litz Loop question? - FARMERIK

Rik
 

What variety of Litz wire would be best for an indoor AM loop of maybe 13-14 inches in diameter? John, who made my custom loops which work so well stocks 175/46 and 660/46 but I have no idea which to ask for.-FARMERIK



Puyallup, WA Ultralight TP's for 4-13

Gary DeBock
 

Hello All,
After a two day visit to Ocean Shores (WA) last week it was back to chasing wispy audio from the big guns again in pedestrian Puyallup. There was some Asian audio to be found from 1250-1320, but it wasn't exactly ocean shore quality.
 
Around 1300 both 693-JOAB and 1566-HLAZ were managing poor to fair audio, with 1575 and 1593 also at threshold audio levels on the high band. Increasing daylight brought 594-JOAK and a presumed 603-HLSA out of the noise for a few weak minutes around 1315, while 693-JOAB hit its peak stride (if you can call it that) with poor to fair level Chinese lessons shortly thereafter. Asian signals collapsed in unison around 1325, with the high pack packing it in a few minutes before the low band. TP signals were dreary at best this morning, but at least they did show up in a halfhearted fashion.
 
693  JOAB   Tokyo, Japan   Anemic Chinese lessons at 1318; not very energetic, but best Asian signal of the morning
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
17" FSL antenna
 
 


1134-AIR Reception on 7.5" loopstick PL-380 in Chigasaki, Japan

Gary DeBock
 

Hello All,
 
For those who dream of receiving India on Ultralight radios (somewhere other than Carbonear, Newfoundland), a very nice video is on YouTube showing that this is very possible-- in Japan. Hiroyuki Okamura of Yokosuka, Japan posted this excellent video of his reception of 1134-AIR at a beach spot near Tokyo, with the Indian station pegging his PL-380 S/N display with its exotic music.
 
73, Gary DeBock (in Puyallup, WA, USA)


Re: DEBO D-932 ???- FARMERIK

Rik
 

Found it!

 Black Scott RX16 = Silver Degen DE 312

Both have 5V input jack and only 2 AA cells inside which is pretty unusual, and the case seems to have the same shape and 'seams'.

Now I'll go look for a review under the Degen model name. - FARMERIK


Re: DEBO D-932 ???- FARMERIK

Rik
 

I spent some time looking to see if the same case was used on another Tecsun radio, but could not find a match.  I looked at what is on Ebay now, and in the files here for radio photos in the reviews. Because of the size, it would have to be a radio using only 2 AA cells. The front of the case appears flat, without the ridge to allow the case over the speaker to curve out slightly like several ULR Tecsuns.

 The frequency coverage or the SW bands is listed on the back of the radio 'stand', very common on Tecsun radios. The slide band selector label also looks like some Tecsun models. I am not as familiar with Kaito, Degen or Redsun, and don't even know if they make/made 2 AA cell radio models. - FARMERIK


Re: DEBO D-932 ???- FARMERIK

R. Mark Barnett
 

I was looking at this Scott and wondering who made it too...
 
 
Mark B. 
 
Obscuris vera involvens


From: "farmerik@... [ultralightdx]"
To: ultralightdx@...
Sent: Sunday, April 12, 2015 5:44 PM
Subject: [ultralightdx] Re: DEBO D-932 ???- FARMERIK

 
I was thinking the case for this DEBO radio looked familiar. Today I happened to dig out my old Tecsun R-9700DX, and found it has controls in exactly the same places. TECSUN either made both or the supplier is using the same molds for both radios. The SW meter bands are displayed in opposite directions though. The Tecsun '9700DX has the lowest SW freq at the top and the DEBO has the lowest freq. at the bottom. I have other radios from China which use the same case too, sometimes with some different panels. I think I have a REDSUN which uses the same case as a TECSUN maybe?

Unless something distracts me, I plan to order that DEBO next week to try it out. It may just be a single conversion variation of the R9700DX. - FARMERIK



Re: DEBO D-932 ???- FARMERIK

Rik
 

I was thinking the case for this DEBO radio looked familiar. Today I happened to dig out my old Tecsun R-9700DX, and found it has controls in exactly the same places. TECSUN either made both or the supplier is using the same molds for both radios. The SW meter bands are displayed in opposite directions though. The Tecsun '9700DX has the lowest SW freq at the top and the DEBO has the lowest freq. at the bottom. I have other radios from China which use the same case too, sometimes with some different panels. I think I have a REDSUN which uses the same case as a TECSUN maybe?

Unless something distracts me, I plan to order that DEBO next week to try it out. It may just be a single conversion variation of the R9700DX. - FARMERIK


DX Extra Shotwave News Show No.25 Released!

Hobart Radio International <hriradio@...>
 


Hello fellow DXers, happy Easter and it is with great eggcitement to release the latest funky shortwave news programme; DX Extra number 25 to the world wide web with extended pirate edition. Enjoy! We also now feature the transcript via google docs.

In the headlines this fortnight:
- Battle over the airwaves
- DRM from high altitude tests
- World Amateur radio day
- Channel Africa summer schedule
- Pirate Radio News, logs and recordings
- Audio Archive: Radio Spaceshuttle (Pirate) 

#------------------------------------------------------------------#
To read the transcript, LISTEN OR DOWNLOAD the podcast simply head to:

Join us on Facebook at: facebook.com/dxextra Over 500 likes!
Subscribe to the RSS feed 
#------------------------------------------------------------------#

Hear us on the radio:
FM: World FM New Zealand
SW: WRMI, Cupid Radio, Premier Radio, Radio Spaceshuttle World Service, Focus International, Magic 6205 Europe, and Pandora Radio (UK).

--
Kind regards,

hriradio.org
Hobart Radio International features DX Extra and The Buzz shows!



DEBO D-932 ???- FARMERIK

Rik
 

Anyone here have one of these? Case looks like a TECSUN.

Too big to be an ULR I would think, but it has fairly wide SW meter bands AND includes two below 49m.


ebay# 

151552031925

or

 


DEBO D-932 AM/FM/MW/SW 12 Band RADIO Sensitivity Receiver


-FARMERIK


Re: TECH: 1SV149 varactor

Rik
 

Thanks Steve for your technical information. I had no idea variactors would need to be matched, but it makes sense when more than one is used. Sort of like having trimmers on multi gang tuning caps. - FARMERIK


Newfoundland Ultralight Radio Logs April 10

Allen Willie
 

Hello To All,


Two new entries early this morning for the Ultralight radio logbook.



1340 khz - CUBA - Radio Ciudad del Mar CMFL, Palmira tx 7:55 UTC 4/10/15 w/ Latin and Spanish vocals, Spanish talk by man, numerous mentions of Cuba, ID at 8:00 UTC

Ultralight Station # 1312 Latin Station # 290


______________________________________________________________

1350 khz = CUBA - Radio Ciudad del Mar CMFL, Aguado de Pasajeros tx 7:55 UTC 4/10/15 w/ same details as above , 1340 signal heard in parallel to 1350

Ultralight Station # 1313 Latin Station # 291

( These latest additions to the logbook were from a Cuban station broadcasting with parallel frequencies right next door to each other with different transmitters. )

_____________________________________________________________

With the most recent solar disturbance from the sun flaring once again yesterday and today, signals this morning were significantly enhanced from a southerly direction particularly a good number of the Cuban stations heard with strength.


Receiver: Sony SRF-M37W Ultralight barefoot



Allen Willie VOPC1AA
Carbonear, Newfoundland


Ocean Shores, WA Ultralight TP's for 4-9

Gary DeBock
 

Hello All,
 
The second (and last) DXing session on the beach at Ocean Shores was quite a bit more interesting than yesterday's, with fairly good propagation on both the middle and high band. The low band continued to underperform, but there were multiple TP's on 1044 at 1311, a huge signal from 1206-Yanbian at 1303, and even a pesky co-channel with 1566-HLAZ (apparently Chinese) right before the Japanese program ended at 1342.
 
It was another clear and cold morning at the beach, with my portable TP-DXing station (Ultralight radio + 15" FSL antenna) set up about 50 feet from the salt water. Without much confidence in the flat beach's potential of providing serious DU action from 0800-1000 my start time was around 1140, by which time 1566-HLAZ's Chinese service was already building up to its usual thunderous level. No other TP was nearly as strong in the total darkness, but some interesting signals starting showing up from the CRI stations on 1017, 1044, 1206 and 1323 just after 1200. All of these except 1044 had good audio in and out, with the 10 kW 1044-KBS station seeming to dominate over CRI. The usual big guns on 1053, 1134 (JOQR), 1287, 1575 and 1593 (CNR1) were all in and out with good audio, but around 1311 an apparent Chinese station started to fight it out on 1566 with the Korean big gun HLAZ. During fades in the Japanese Christian program the UnID Chinese even managed equal strength-- although no real identity clues were gained. After HLAZ switched to its Chinese program (with a different antenna) around 1344 the mystery station tapered off down into the noise, along with most of the other Asians. By 1400 only the big guns 774-JOUB, 972-HLCA and 1566-HLAZ were still around on the wet sand, and after spending two and a half hours on the cold beach it certainly seemed like they would last a lot longer than I would. My portable DXing station was dismantled at 1410, well before 1566-HLAZ's Chinese service dropped into the noise. Overall the two day visit was interesting, with somewhat better Asian results than expected. The low band never really got untracked, however, with even 594-JOAK sounding anemic. 
 
1017  CRI   Changchun, China   Korean service with Chinese lessons at a good level at 1254
 
1044  CRI- KBS Mix    The Korean female voice having the apparent edge over its co-channel at 1311
 
1053  Korean Jammer    Pretty good jam session at 1232
 
1206  CRI  Yanbian, China   Female Korean speech and music at an awesome level at 1303
 
1287  JOHR   Sapporo, Japan   Japanese male and female speech at good level at 1208
 
1566  HLAZ   Jeju, S. Korea   The usual nuclear-powered signal during Chinese service at 1214
 
1566  UnID   Apparent Chinese female speech mixing with HLAZ's Japanese male speech at 1314
Same station-- this time with apparent Chinese male speech mixing with HLAZ's Japanese female speech
 
1575  VOA   Ban Rassom, Thailand   Male Asiatic language speech at a very good level at 1307
 
73 and Good DX,
Gary DeBock (DXing at Ocean Shores, WA)
7.5" loopstick C.Crane Skywave Ultralight
+15" DXpedition FSL antenna
 
 
 


Re: TECH: 1SV149 varactor

Phillips
 

Thanks for that info Steve. 
 
 
 
 
 
 
Ray
35S138E

 
 
COLEMAK
The keyboard layout for rational thinkers
Available for Windows, Mac, Linux & Android

 

To: ultralightdx@...
From: ultralightdx@...
Date: Thu, 9 Apr 2015 11:12:44 -0700
Subject: [ultralightdx] TECH: 1SV149 varactor

 
Perhaps of possible interest to anyone who works with varactors. I
bought 50 1SV149 Chinese-made varactors on eBay after Ray mentioned
using them. They just came and I've been testing them. Other types
(MVAM108, 109) that I've used for many years are not matched at all and
require testing if multiple diodes will be used since the capacitance
(measured at max capacitance at 1 volt) will be all over the map, 50 pF
or more variation. But testing these 1SV149's show them to be very close
to each other, at least for the 20 I tested before stopping. So these
hardly need any matching at all except for the closest match one
desires. (440-450 pF at 1 volt bias--very close compared to other types
I've tested).
I have a simple homebrew varactor test jig that connects to the cap
meter and lets the meter measure the varactor capacitance vs. bias
voltage. For matching purposes one just sets the bias to 1 volt.
Steve



Varactor Test Fixture placed in Files

Steve Ratzlaff
 

I put the Varactor Test Fixture diagram in the Files, under the "Antennas and Equipment" folder.
Steve

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