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MW and LW Loops For Sale

Everett N4CY
 

I have two 1 Meter Loop Antennas for sale, one covers the MW band and the other covers the LW band. I am asking $200 for the MW loop and $225 for the LW loop. I do not want to ship them so they are only available for pick up at my QTH, which is Tuscaloosa, AL. They are one of a kind and very professionally built.
 
There is an article in the files section under Antennas and Equipment, "The Twin Hex Loop Antennas" that has pictures and info on the two loops. If there is interest please contact me off list at everettsharp (at) aol.
 
Everett N8CNP



Re: Grundig/Eton G8 Question

Russ Edmunds
 

I have one PL-310 and 3 PL-310E's, and I do prefer them - if only because they have an external antenna jack for FM.  When I bought the G8's, the only other ones out there were the Sangean 210's. Those had no selectivity to speak of, and comparably not selectivity either. My SRF-59 did better in both regards.

Alas, the quality is now inconsistent o0n the PL-310E's as I bought two more this past summer, one of which seems to have less sensitivity and/or a higher noise level than any of the others.



Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@...>

AM: Modified Sony ICF2010's (2) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15';
Grundig G8 w/whip; modified Sony ICF2010 w/whip


On Mon, Oct 5, 2015 at 2:16 PM, farmerik@... [ultralightdx] <ultralightdx@...> wrote:
 

My opinion is TECSUN radios do an incredible amount for the money, but few digital ones last more than a few years. I like the Traveler III better than the G8. Perhaps you will too. -FARMERIK



Re: Grundig/Eton G8 Question

Rik
 

My opinion is TECSUN radios do an incredible amount for the money, but few digital ones last more than a few years. I like the Traveler III better than the G8. Perhaps you will too. -FARMERIK


Grundig/Eton G8 Question

Russ Edmunds
 

I bought two of these when Radio Shack had them at $30 each several years ago, I've recently noticed that on one of them, both AM and FM, the audio on weak signals has become very warbly. This is a bit better on battery than on the standard unregulated RS supplies, but is still there.

 I have run this ( on AC ) 18/7/120 to 24/7/120 for FM E skip DX during the season for the past 4 years, and I'm wondering if this is simply an indication that I've overworked it. It's probably not worth trying to fix anything.

Anyone have any thoughts ?


Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@...>

AM: Modified Sony ICF2010's (2) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15';
Grundig G8 w/whip; modified Sony ICF2010 w/whip


Puyallup, WA Ultralight TP's for 10-5

Gary DeBock
 

Colin might be interested in knowing that there was indeed a rather potent sunrise enhancement for the TP's this morning, but it was all for the benefit of the NHK big guns. What started off looking like a real clunker session was rescued somewhat by a dramatic propagation boost for the Japanese just prior to 1400, with 594, 693, 747 and 774 all reaching very good levels.
 
At my 1250 start time the band was dreary indeed, with only 774-JOUB and 1566-HLAZ managing fair audio in and out. Throughout the predawn darkness up to 1330 only a few other big guns managed poor audio (594, 693, 747 and 828), while all the second-tier Asians were missing in action. The session seemed like a real clunker until 1340, when 594-JOAK started a pretty impressive run from the noise level up to very good strength. 693-JOAB and 747-JOIB soon followed in the same way, and these NHK big guns (including 774-JOUB, which is on a very noisy frequency here) suddenly sounded very healthy while all the other Asians were stuck down in the noise. 693-JOAB hit an S9 level temporarily with its 3+1 pips at 1400, while for once the Vancouver splatter was missing in action. The NHK big guns stuck around until about 1410 here, when they also turned their nose up at the lackluster propagation. Overall best signal was from 693-JOAB around 1400, in between NHK2 Chinese and English lessons. The session would have been very dreary except for the dramatic surge of the NHK big guns, at a time when all the other Asians seemed to be taking the day off.
 
594  JOAK   Tokyo, Japan   Japanese news at very good strength at 1357 after dramatic signal boost
 
693  JOAB   Tokyo, Japan   Chinese lessons at potent strength at 1359
        S9-level 3+1 time pips at 1400 TOH, followed by English lesson introduction (Vancouver splatter on strike?)
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
15" FSL antenna
 
 


Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Rik
 

As I was just looking on eBay I found a photo of a Fisher AM loop in this listing for the AM FM 80 T version-

Fisher 80-T Tuner with wood case and manual

 


The 80 T only has two AM selectivity settings, not three like the AM 80. All three are well chosen.

I have ordered the Amidon 12 inch ferrite. Still looking at Litz. I think # 46 wire is right for AM BCB, still have to choose how many conductors.

For the air core loop I plan to have my 4 foot LW loop cut down to 38 inches which is supposed to be 47.5 uH with 4 turns 3/4 inch apart. I'll have it set up so it could have part of another turn for final matching.

If I want to use either resonated to a regular radio  antenna input,  according to the loop calculator I used, my cap with a 6:1 reduction would tune them from about 1200 Kc to 7.4 Mc. Then the Litz high Q would work.

Yes, I know the Fisher is definitely not a ULR, but here are the most experienced ferrite and air core loop makers I know.

Thanks - FARMERIK


Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Steve Ratzlaff
 

Thanks, good info there, especially the link to the Fisher manual. Too bad the parts list doesn't give details such as the turns ratio for the AM input transformer and the tuning cap values for AM. It appears the external loop inductance is being stepped up by the input transformer and then resonated at the transformer secondary. The transformer could be most any turns ratio though integral turns ratios (2,3,4,5, etc.) don't yield inductances at the secondary that one would like, so they probably use non-integral turns ratio for the transformer.

Remember that for the a ferrite rod, inductance is max with the coil in the center and decreases as the coil moves toward either end. Since you indicate Peter is your repairman, it sounds like you should just pay him to do all the experimenting to try this idea (he or someone mentions that idea).
I doubt many turns would be needed to get 47 uH on a ferrite rod with 125 permeability (-61 mix, normal AMBC ferrite rod type). That might mean it would turn out to have poorer sensitivity than a much larger air loop.

(Photos need to be uploaded into the Photo section of the Files.)

Steve

On 10/4/2015 2:42 PM, farmerik@... [ultralightdx] wrote:
 

Thanks. Yes I still have the LC meter, but less use of my hands and poorer eye sight.

I tried to upload photos of the tuner and Litz loop here, but it would not go.

Here is some discussion about it by Pete who does my repairs-

Antique Radio Forums • View topic - AM loop antenna for Fisher AM-80 or 80-T

 

-FARMERIK



Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Rik
 

Thanks. Yes I still have the LC meter, but less use of my hands and poorer eye sight.

I tried to upload photos of the tuner and Litz loop here, but it would not go.

Here is some discussion about it by Pete who does my repairs-

Antique Radio Forums • View topic - AM loop antenna for Fisher AM-80 or 80-T

 

-FARMERIK


Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Steve Ratzlaff
 

Yes, the air loop calculators such as the very good one of Reg Edwards will work fine with Litz.
One can space the turns closer using Litz due to less turn to turn capacitance, if desired.
Steve

On 10/4/2015 1:35 PM, farmerik@... [ultralightdx] wrote:
 

I thought there might be a calculator for winding ferrite loops as there is for winding air core loops.

Can I use Litz instead of ordinary wire for winding an air core loop and still have the loop calculator be correct?



Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Rik
 

I thought there might be a calculator for winding ferrite loops as there is for winding air core loops.

Can I use Litz instead of ordinary wire for winding an air core loop and still have the loop calculator be correct?

-FARMERIK


Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Rik
 

My early 1950's tube Fisher AM 80 tuner was made for a 47.5 uH loop antenna  they supplied for the back of the cabinet. It connects in series with a shielded coil inside the tuner.

I had a 48.5 uH Litz air wound antenna I had made to experiment with. My radio repairman cut it back to match the Fisher loop antenna input. It works VERY well, but I'd like to try ferrite and a larger air core loop too.

-FARMERIK


OT: Replacement parts for ultralights...

r_lebreton36@...
 

Hi, Folks!


Just a quick question for the group: I have a Grundig G3 receiver.  However, I managed to bust up the back stand such that it is not repairable.


Could anyone recommend where I could get a replacement back stand for a Grundig/Eton G3/E3 receiver?


TIA...


Re: Tecsun PL-360 7.5" Portable Loopstick by Gary DeBock...

r_lebreton36@...
 

It's Richard


Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Steve Ratzlaff
 

Hi Farmerik,
The following is just my . It sounds like you are hoping to build a non-resonant (untuned) antenna with a very small inductance, using a ferrite rod. (47.5 uH would require a very large tuning capacitor, if you were planning to make it a tuned loopstick--normally inductance in the range of 285 uH is used for the AMBCB.) Your idea would require experimentation to figure out how many turns on the loopstick would be needed--it won't take many turns since the normal -61 (125 permeability) ferrite rod magnifies the turns a lot to give a big increae in inductance. I suggest you take your LC meter and start winding turns and do your own experimentation, since whoever you get to build the final version would have to do the same unless you told him how many turns, spaced such and such a distance from the ends of the rod, whether you wanted two coils, etc. Lots of things to figure out. And the size of the Litz probably makes little difference since using big Litz gives the improvement primarily for a tuned loopstick, not an untuned one. I doubt that use of contra winding would give any improvement over regular since again contra winding is for tuned circuits.
Normally the shortest ferrite rod gives the deepest nulls, but that's counterproductive for best sensitivity where the longest rod works for that.
So, I suggest you dive in and start doing your own experimentation and figure out for yourself what would work to best meet your objectives. I have no idea where to start for number of turns, etc.--that's all where I would have to start, too, if I were involved in such a theoretical project.
Good luck!
Steve

On 10/3/2015 3:59 PM, farmerik@... [ultralightdx] wrote:
 

I read articles in the files section here but they are way beyond my understanding. I want to have a 47.5 uH Ferrite antenna made for me locally. It should be as directional and 'sensitive' as possible.

My thoughts are two 95 uH coils widely spaced on the ferrite. Not sure if contra wound  would is better or if they should be wound in the same 'direction'. Connected in parallel for 47.5 uH .

I am thinking of the 12 inch Amidon core, but it may not be much better than the 7.5 inch ferrite they sell.

I plan to use the highest count Litz wire I can find reasonably priced. I want Litz for the stronger signals they get compared to ordinary wire loops of the same diameter.

Any comments welcome- FARMERIK




Re: Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Paul S. in CT
 

Farmeric:

Some mutual friends from Crystal Radio Days past may be of use. As for a more intellegible "theory" Ben Tongue's website bentongue dot com and Dave Schmarder's (n2ds) website are a valuable rescource. I do have questions... why are you settling upon 45-50 uH? Standard coils are 250-400uH, and division by two is 125-200uH. Are you thinking of a balun transformer to boost inductance to these levels?

Paul S. in CT


Puyallup, WA Ultralight TP's for 10-4

Gary DeBock
 

Asian results here were very similar to those reported by Dennis, with a collection of the usual TP big guns without much else. The Japanese on 594, 693, 747, 774 and 828 were the best performers (along with the usual 1566-HLAZ), but second-tier TP's were few and far between.
 
Well before sunrise at 1250 there were already very good signals from 747-JOIB and 1566-HLAZ, along with good signals from 594-JOAK and 774-JOUB. 603-HLSA managed threshold audio just prior to the 1300 TOH and stayed there for most of the session, rising up to brief fair levels (with an equally weak Chinese co-channel) around 1350. Other than this (and the occasional fair signal from 1134-JOQR) is was another NHK big gun show, with 774-JOUB and 594-JOAK both hitting very good peaks throughout the session. The usual powerhouse 972-HLCA was missing in action, though, and the 1053-Jammer sounded anemic at best. The second tier TP's that showed up yesterday on 657, 738 and 936 took the day off, and the usual collection of NHK big guns bailed early here, around 1410. Such was the story of another typical session in this lean solar year.
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
15" FSL antenna 
 
 
 

 


Steve R., Eversharp, et al Ferrite antenna? - FARMERIK

Rik
 

I read articles in the files section here but they are way beyond my understanding. I want to have a 47.5 uH Ferrite antenna made for me locally. It should be as directional and 'sensitive' as possible.

My thoughts are two 95 uH coils widely spaced on the ferrite. Not sure if contra wound  would is better or if they should be wound in the same 'direction'. Connected in parallel for 47.5 uH .

I am thinking of the 12 inch Amidon core, but it may not be much better than the 7.5 inch ferrite they sell.

I plan to use the highest count Litz wire I can find reasonably priced. I want Litz for the stronger signals they get compared to ordinary wire loops of the same diameter.

Any comments welcome- FARMERIK


Puyallup, WA Ultralight TP's for 10-3

Gary DeBock
 

As reported already (by Colin, Nick, Walt, Dennis and Bruce) it was another big gun Asian revue this morning, with a few cameo appearances from second-tier TP's at times. Besides the usual potent signals on 594, 693, 747, 828, 972 and 1053 there were anemic signals on 603, 657, 738, 936 and 1134 during brief periods here, although none of these could stick around for more than few minutes at a time.
 
Just before 1300 there was already weak audio on 603, 657 and 738 here, in addition to the usual Japanese and Korean big guns. The second-tier Asians took turns sliding in and out of the noise all session long, though, without paying any attention to the non-existent sunrise enhancement. 693-JOAB, 747-JOIB and 972-HLCA all managed very good audio at times, with 594-JOAK and the 1053-Jammer reaching good levels. Late on around 1400 unusual threshold audio appeared on 936, but the Chinese-sounding speech could only reach a ghostly level. By contrast 1134-JOQR reached fair audio in the Vancouver splatter at 1405, with its animated Japanese female speech rising above the noise for a couple of minutes. 972-HLCA was the best overall performer during the lackluster session, with very good Korean speech at various times during its variety program from 1330-1410. Overall it was a morning to forget, without much variety or drama.
 
603  HLSA   Namyang, S. Korea   Ghost-level pop music hosted by the deep-voiced male at 1320
 
972  HLCA   Dangjin, S. Korea  Good-level Korean male speech during variety program at 1327
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
15" FSL antenna
 
 


Newfoundland Ultralight Radio Logs October 3, 2015

Allen Willie
 

Hello To All ,


Two new additions to the Ultralight DX logbook early this morning



 1110 - KFAB - Omaha, Nebraska 7:45 UTC 10/3/15 w/ Coast to Coast AM program talking about spirits , phone call-ins , (signal mixing with and peaking through WBT Charlotte )
 "Newsradio 11-10 KFAB" Station ID at 8:00 UTC then into Fox News and return to Coast to Coast AM (Both WBT and KFAB running Coast to Coast AM but program delayed a bit on KFAB compared to WBT feed)


Ultralight Station # 1331 



1500 - KSTP - St. Paul, Minnesota 8:55 UTC 10/3/15 w/ Mike Tirico's Weekend Blitz, ESPN ID's, sports talk about NFL Football ( signal peaking at times under WFED Washington DC ) //tunein(dot)com audio webfeed


Ultralight Station # 1332



Receiver: SONY SRF-M37W Ultralight (barefoot mode)


Good DX



Allen Willie VOPC1AA
 Carbonear, Newfoundland
 47'44"15N 53'11"46W
 Grid Square GN37JR


Puyallup, WA Ultralight TP's for 10-2

Gary DeBock
 

Walt and Colin have already described this morning's propagation very accurately-- another session featuring the regular Japanese and Korean big guns. There were a few second-tier Asians showing up weakly on 603, 657 and 738, but none of them could stick around for more than a few minutes at a time.
 
At my 1300 start time it seemed like the session might have some potential, as the usual big guns on 594 (fair), 747 (fair), 972 (fair to good) and 1566 (good) were joined by threshold-level signals from 603-HLSA, 657-Pyongyang and a presumed 738-BEL2. These three second-tier Asians continued to slide in and out of the noise for the rest of the session, with 603-HLSA reaching a poor to fair level with KBS2's deep-voiced male at 1346 (this was almost certainly Colin's UnID). A wimpy sunrise enhancement failed to boost anything, although 693-JOAB, 747-JOIB, 972-HLCA and 1566-HLAZ all managed good levels at times during the session. Best signal of the morning was from 972-HLCA with its Korean male speech at 1351. Overall the session was somewhere between lackluster and lame, with very little variety in the Asian signals.
 
603  HLSA   Namyang, S. Korea   Ghostly deep-voiced male introducing eerie music at 1346-- Halloween-level signal
 
972  HLCA  Dangjin, S. Korea   Korean male speech at good level at 1351, but not quite free of "Freedom 970"
 
73 and Good DX,
Gary DeBock (in Puyallup, WA, USA)
7.5" loopstick C.Crane Skywave Ultralight +
15" FSL antenna
 
 

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