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 Post subject: AM antenna for a Silvertone Model 7039
PostPosted: May Sun 03, 2015 4:35 am 
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I had my Silvertone Model 7039 radio restored. When I came to pick it up in St Louis and checked it out, it could receive signals to many AM stations. But when I got home, I could only get 2 stations because we live in the country. I saw on the internet an AM antenna called the ccrane Twin-Coil-Ferrite-AM-Antenna-Signal-Booster. Will this work for my radio and if I got it, how would I hook it in to the main radio antenna wire that goes to the receiver.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Sun 03, 2015 5:29 am 
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Joined: Feb Tue 24, 2009 8:20 am
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Location: Aurora Colorado
Welcome to the forum, on the back of the set there is a terminal marked external antenna, attachn a piece of wire around 10 feet log to that, and drape it

up over the curtains or window frame and see how that works.

Longer is fine, also.Let us know how it goes.

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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Sun 03, 2015 2:18 pm 
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Location: Galena, Ohio
Welcome to the forum! For me, I found that my plasma tv's in the house were a huge source of interference, so if I really want to listen to one of my radios, I have to turn those plasma tvs off, so if also have plasma instead of LCD, that might be your problem.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Mon 04, 2015 4:32 am 
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Moving the radio out to the back porch helped a lot and attaching the wire helped with the short wave bands but not the AM.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Mon 04, 2015 12:02 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 19915
Location: Utica, NY 13502 (USA)
This radio uses a TRF stage for the AM band so it should be quite sensitive. But it uses a built-in loop antenna for that stage which I assume is connected and aligned properly. The shortwave bands do not use this extra stage. Unfortunately, a short external antenna won't work very well for the AM band due to the method they used for coupling. When this radio was made, most people who lived a good distance away from the stations put up outside antennas that were much longer than 10 feet.

http://www.nostalgiaair.org/PagesByMode ... 017626.pdf

Dave


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Mon 04, 2015 12:40 pm 
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Joined: Feb Tue 24, 2009 8:20 am
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Location: Aurora Colorado
Was the set connected to an antenna when you bought it?

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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Mon 04, 2015 1:06 pm 
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Joined: Oct Wed 01, 2014 1:20 pm
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Location: Wood River, Ill.
I have had very good luck with the CC Crain double loop antenna with some of my radios for BC listening. Not as good as an outdoor wire, but does very well nulling out local interference. They are directional. It has proven to be a good alternative to a outside antenna for me.

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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Thu 07, 2015 2:48 pm 
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Joined: May Sun 03, 2015 3:41 am
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The internal antenna was one of the things that was repaired at the shop in St Louis and is now functioning normally. My main problem is that there are only 2 AM stations in my vicinity and I would like a recommendation for an indoor external antenna that would give me reception for more stations, so I think I'll try the CC Crain double loop antenna. Thanks for the recommendation.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Thu 07, 2015 3:31 pm 
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Joined: May Sat 06, 2006 4:03 am
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Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
You can't be so far away that you can't receive KMOX and other 50,000 watt stations. How about night time listening.
Bill J.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Thu 07, 2015 6:13 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Utica, NY 13502 (USA)
This radio, if working correctly, should be alive with stations at night due to skywave propagation. Did the restoration include replacing all paper and electrolytic capacitors and complete re-alignment of the IF and RF circuits?

Dave


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Fri 08, 2015 5:35 am 
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Joined: May Sun 03, 2015 3:41 am
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I definitely get more stations at night but static is worse. I don't know if the paper and electrolytic capacitors were replaced or if there was a re-alignment of the IF and RF circuits.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Fri 08, 2015 11:39 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 19915
Location: Utica, NY 13502 (USA)
Static will sometimes be worse at night depending on the level of household generated interference caused by light dimmers, computers, and other equipment being used. A vintage radio cannot be considered "restored" until all paper and electrolytic capacitors are replaced and a proper alignment procedure has been performed.

Dave


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Fri 08, 2015 3:19 pm 
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Joined: May Sun 03, 2015 3:41 am
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I'll write the guy that did the restoration and find out. Thanks for that Tip.


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 Post subject: Re: AM antenna for a Silvertone Model 7039
PostPosted: May Fri 08, 2015 6:22 pm 
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Joined: Oct Wed 01, 2014 1:20 pm
Posts: 141
Location: Wood River, Ill.
I have found a very annoying source of noise in my house has been the CFL (compact fluorescent lamps). Some brands are worse than others, but in try to avoid them anymore. I don't know if the new LED lamps are any better. In most cases, though, I can null them out by rotating my antenna. Try turning the lights out. That way too, you can enjoy the warm glow of the vacuum tubes. :)

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Chris
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