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Hallicrafters S-120 questions

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Hallicrafters S-120 questions Empty Hallicrafters S-120 questions

Post by tuberadiogeek on Thu Feb 28, 2013 3:37 am

I just got my first shortwave radio and it works well, besides lots of squealing. IDK if that is normal or not. It makes it difficult to listen to while other people are home, and i currently have no headphones to use with it. Is it just normal for an S-120 to squeal and be slightly staticy or is there something that can be done about it? The radio is fully re-capped and i put a good 12BE6 in it, as the other one was weak. I get good reception with my 110' antenna made out of mostly 17 gauge steel fence wire. I have been able to pick up radio china and something that sounds japanese and possibly italian.
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Post by Resistance is Futile on Thu Feb 28, 2013 4:11 am

Is your BFO switch off?
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Post by tuberadiogeek on Thu Feb 28, 2013 4:29 am

Yes. I dont turn it on unless i'm trying to get sideband, which i havent yet.
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Post by Resistance is Futile on Thu Feb 28, 2013 5:40 am

No, not normal in that receiver.
If you put the frequency dial to the highest frequency you should notice almost no static or noise.
Static can be just outside atmospheric noise or it could be an indication that some component is failing. Either the variable capacitor, or the I.F. Trimmer caps can be suspect. A loose connection, such as antenna, ground, even house wiring. If its random noise and you can see no time cycle then its probably not man made. You volume control, tubes or even the sockets can generate noise.

The squeal is another matter, you may have unwanted feedback in a circuit, caused by miswiring, leads not being dressed properly, howling is from loose connections and the speaker is vibrating the chassis and setting up feedback. Try tapping each component with a wooden stick and see if the static or squealing increases, if so then you may have found the area to look in.
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Post by tuberadiogeek on Thu Feb 28, 2013 10:21 pm

Here are a few recordings of some stuff i picked up last night and today. I recorded them with my old radioshack computer mic. By listening to some of the stuff you can get a better idea what stuff sounds like.
1.8mhz japan radio.wav
china radio.wav
music 18mhz.wav
14mhz music.wav
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Post by sprman on Sun Mar 03, 2013 5:32 pm

14mhz one sounds ok to me at the begining.Sprman

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