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 Post subject: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 7:06 pm 
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Joined: Sep Mon 03, 2018 2:24 am
Posts: 464
Location: Fenton, MI
I have an area that noise and hum on the AM broadcast band is so bad I can only hear two stations with a 17 tube console. One station is weak other station is 15KW at 1/2 mile away that is, of course, powerful and crystal clear.

I bought a Tecsun AN-100 tunable loop antenna and wired it to my radio. I can now pick up clearly 15 stations on AM during the day. At night would get much more. I can also null out the terrible hum anywhere on the AM band by turning the antenna.

This antenna completely outperforms my long wire antenna. $32 shipped from seller on ebay.


Last edited by allied333 on Sep Thu 13, 2018 8:08 pm, edited 1 time in total.

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 7:11 pm 
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Joined: Jun Sun 16, 2013 10:12 pm
Posts: 638
Location: Brandon, SD
Yep, they work amazing... Have 7 Tecsun AN-200 hooked to my consoles... I have a "noisy" house that makes clear stations tough... After the first one I purchased I liked it so much I bought 6 more, but i get them for a best offer of $14.25 plus $10 shipping, $32 is a little high... Heres a link...

https://www.ebay.com/itm/Tecsun-AN200-A ... 1274642142


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 7:24 pm 
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Joined: Sep Mon 03, 2018 2:24 am
Posts: 464
Location: Fenton, MI
sdradioman wrote:
Yep, they work amazing... Have 7 Tecsun AN-200 hooked to my consoles... I have a "noisy" house that makes clear stations tough... After the first one I purchased I liked it so much I bought 6 more, but i get them for a best offer of $14.25 plus $10 shipping, $32 is a little high... Heres a link...

https://www.ebay.com/itm/Tecsun-AN200-A ... 1274642142

I seen that, but did not want the month wait from Hong Kong to USA. I am buy another now and do not mind the wait.

Just to tell you for two weeks I been talking about poor reception, why battery radios seems to fair better, etc. No one mentioned a loop antenna on this site- go figure!


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 7:50 pm 
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Joined: Jun Wed 08, 2011 2:33 am
Posts: 7255
Location: Ohio 45177
Looks like a similar antenna that was out some years ago. Gray plastic job with dial under a window. Terk? Forget the brand. I have or had two of them, I don't know where they are. The only issue with those is having to track the antenna when tuning around.


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 7:59 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 5354
Location: Mountains of Mourne. Ireland.
110 ft. of wire + milk crate + air spaced variable capacitor.

Image

https://interrocknation.blogspot.co.uk/ ... radio.html

Greg.

oh... the Lazy-Susan is optional... :)


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 9:27 pm 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 23599
Location: Annapolis, MD
allied333 wrote:
Just to tell you for two weeks I been talking about poor reception, why battery radios seems to fair** better, etc. No one mentioned a loop antenna on this site- go figure!

should we be referring you to the complaint department??

I read that thread and added a bit from my feeble knowledge---If I remember correctly, you didn't ask about how to improve performance.

** fare

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"It's always something". --Gilda Radner (1946 - 1989)


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 10:28 pm 
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Joined: Sep Mon 03, 2018 2:24 am
Posts: 464
Location: Fenton, MI
pixellany wrote:
allied333 wrote:
Just to tell you for two weeks I been talking about poor reception, why battery radios seems to fair** better, etc. No one mentioned a loop antenna on this site- go figure!

should we be referring you to the complaint department??

I read that thread and added a bit from my feeble knowledge---If I remember correctly, you didn't ask about how to improve performance.

** fare

:roll:


Last edited by allied333 on Sep Thu 13, 2018 11:25 pm, edited 1 time in total.

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Thu 13, 2018 10:51 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11842
Location: Mpls, Minnesota
A search on this forum would bring up lots of loop antennas :)

Dave


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 12:09 am 
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Joined: Jun Sun 16, 2013 10:12 pm
Posts: 638
Location: Brandon, SD
When I ordered mine it only took about a week to arrive...


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 12:10 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7905
Location: Beautiful Downtown Burbank CA
The new Tecsun AN-200 has a stereo socket for external ant.

Image

I used it to greatly extend the range on my wireless transmitter with no connections.

Image

Mine took 11 days.


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 12:31 am 
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Joined: Dec Sun 14, 2008 3:33 pm
Posts: 733
Location: Tokyo
The range on my AN-200 gets up to a tick over 1900KHz, so I can use it for 160 meters and the maritime broadcasts above the MW BC band. Amazing how it can null out noise.

Rob


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 12:33 am 
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Joined: Jan Mon 18, 2010 2:13 am
Posts: 17227
Location: Dayton Ohio
allied333 wrote:
Just to tell you for two weeks I been talking about poor reception, why battery radios seems to fair better, etc. No one mentioned a loop antenna on this site- go figure!


Well, I did talk about them in this thread, sorry I didn't suggest trying one on your Midwest.

viewtopic.php?f=1&t=345989

I built a large outdoor loop antenna to help bring in CFZM AM 740 out of Toronto.

viewtopic.php?f=1&t=208459
viewtopic.php?f=2&t=234206&start=40

-Steve


Attachments:
outdoorloop1.jpg
outdoorloop1.jpg [ 55.02 KiB | Viewed 855 times ]

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 12:36 am 
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Joined: Sep Mon 03, 2018 2:24 am
Posts: 464
Location: Fenton, MI
azenithnut wrote:
allied333 wrote:
Just to tell you for two weeks I been talking about poor reception, why battery radios seems to fair better, etc. No one mentioned a loop antenna on this site- go figure!


Well, I did talk about them in this thread, sorry I didn't suggest trying one on your Midwest.

http://www.antiqueradios.com/forums/vie ... 1&t=345989

I built a large outdoor loop antenna to help bring in CFZM AM 740 out of Toronto.

http://www.antiqueradios.com/forums/vie ... 1&t=208459
http://www.antiqueradios.com/forums/vie ... 6&start=40

-Steve

Nice antenna.


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 1:56 am 
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Joined: Jan Mon 18, 2010 2:13 am
Posts: 17227
Location: Dayton Ohio
Thanks! It was a bit of work, but worth it!

-Steve

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Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 4:44 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 28977
Location: SoCal, 91387
I've posted pics of my homebrew 23" diameter tunable loop before. Size matters, and this does outperform both my Grundig AN200 and Selec-A-Tenna smaller loops;


Attachments:
BCB Loop.JPG
BCB Loop.JPG [ 188.89 KiB | Viewed 765 times ]

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 8:29 pm 
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Joined: Feb Sun 02, 2014 9:13 pm
Posts: 1856
Location: Roanoke, VA
I have gotten excellent results with a Radio Shack 15-1853 tuned loop.

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http://plymouthcolony.net/starcity/radios/


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 9:09 pm 
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Joined: Oct Wed 25, 2017 12:10 am
Posts: 206
Location: Idaho / Colorado
I built two of these years ago, one for MW and one for SW. The MW one works like a charm, increasing the signal strength by at least a factor of 2 when tuned in. The SW one works all right but since I designed it to cover all the way from 1800 to 15000 kc, it needs a geared system on the variable capacitor to be of much use.

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Fri 14, 2018 11:16 pm 
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Joined: Sep Mon 03, 2018 2:24 am
Posts: 464
Location: Fenton, MI
keenmaster486 wrote:
I built two of these years ago, one for MW and one for SW. The MW one works like a charm, increasing the signal strength by at least a factor of 2 when tuned in. The SW one works all right but since I designed it to cover all the way from 1800 to 15000 kc, it needs a geared system on the variable capacitor to be of much use.

How about a vacuum variable capacitor?


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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Sat 15, 2018 4:52 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 28977
Location: SoCal, 91387
allied333 wrote:
keenmaster486 wrote:
I built two of these years ago, one for MW and one for SW. The MW one works like a charm, increasing the signal strength by at least a factor of 2 when tuned in. The SW one works all right but since I designed it to cover all the way from 1800 to 15000 kc, it needs a geared system on the variable capacitor to be of much use.

How about a vacuum variable capacitor?

What exactly is that?

What he needs is a Vernier tuning dial.

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 Post subject: Re: AM Tunable Loop Antenna - Wow!
PostPosted: Sep Sat 15, 2018 9:20 am 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 23599
Location: Annapolis, MD
https://en.m.wikipedia.org/wiki/Vacuum_ ... _capacitor

Completely irrelevant to the problem of tuning the SW loop. The issue is the range of capacitance required. Resonant frequency is inversely proportional to the square root of C. Thus, a change of 4X in C gives a 2X change in resonant frequency.

1800 to 15000 is a range of over 8:1, which requires a capacitance range of almost 70:1, which is not easy to make.

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"It's always something". --Gilda Radner (1946 - 1989)


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