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Feedback into computer speakers

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Feedback into computer speakers

Post  KJ4LRM on Sun Feb 05, 2012 10:56 am

I hear myself in my computer speakers when I talk on 10m.
I hear it on both tuners and both antennas

tuners -AT-200 & Yaesu FC-30
Antennas - Antron99 & G5RV

Help!
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Re: Feedback into computer speakers

Post  southern88 on Sun Feb 05, 2012 12:45 pm

Try turning your power down

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Re: Feedback into computer speakers

Post  AC4M on Wed Feb 08, 2012 12:13 am

Bunching the cables with cable ties to reduce their length (short as possible) may reduce the interference, as will winding each speaker cable around ferrite rings (winding at least 10 to 15 turns around the ferrite ring for shortwave radio station of HF amateur radio interference). The ferrite rings act as RFI filters, making the cables inefficient aerials. This reduces the level of the radio signal on the amplifier wiring. It is important to place the ferrite rings close to the amplifier unit Or source of audio itself for best interference suppression .

Don't forget to feed the mains power cable to the computer speaker's amplifier around a ferrite ring too, as it is very common for most of the interference in these cases to emanate from the 120V or 240V mains power supply.

Also keep a great distance away with your audio cables might help as well.

ALL equipment should have a great earth ground and it should not be daisy chained at all. I hope this helps I have ran into issues like this in the past on 12m,10m and 6m before.

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Re: Feedback into computer speakers

Post  WD4PG on Wed Feb 08, 2012 12:05 pm

Craig that's good info you are exactly right.

Wayne, do you get rf in your speakers with both antennas? You have a G5RV and an Antron 10 mtr vertical, right?
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Re: Feedback into computer speakers

Post  KJ4LRM on Thu Feb 09, 2012 12:17 am

Thanks guys, I will try these and let you know what I find.
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Re: Feedback into computer speakers

Post  WD4PG on Fri Feb 10, 2012 8:09 am

Check your connections. Like Craig said make sure your station has a good earth ground and a good rf ground. Make sure all of your rf connectors are properly installed. Usually issues with pl-259s will show up as high swr, but not always depending upon your antenna. You generally have less of this trouble with interference from resonant antennas as opposed to non-resonant multi-band antennas. Try adding a real coax balun to your antenna feedpoint and where it comes in the shack to stop feedline radiation. This link shows you the proper way to make a coax balun... http://www.hamuniverse.com/balun.html

Also if you overdrive your transmitter with too much mic audio on SSB your signal will splatter and cause interference.

And it may be that everything is working as it should and your signal just gets into your speakers. Usually this is the case if it only happens on one band and/or it's harmonic freqs.

If so add some filters to your audio leads near the speakers and at the PC. http://answers.yahoo.com/question/index?qid=20080502192726AACfuYr
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Re: Feedback into computer speakers

Post  KK4GFT on Mon Feb 13, 2012 5:36 am

Un-plug the speakers.. I bet it stops then. lol!

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