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I have a TS-2000 and I was using it as a 2 meter Echolink station as well as for my HF activities. One day I started getting an intermittent buzz on the transmit audio. We also tested the unit on HF SSB and the transmission was garbled. I really don't want to have to send it to the shop if there is anything that can be done to fix this. We've tried different power supplies and that didn't change the buzz. I did a full reset but no change. Any ideas?

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Hi Mike.. I was plagued with some strange sounds on my Icom 756Pro receive in the past - it can be frustrating to resolve. Trouble with xmit audio could be due to poor SWR and feedline issues. I would attempt xmit into a dummy load - to isolate the antenna systems. If the objectionable audio interference clears up and the SSB is no longer garbled - the issue will lie with the feedline / antenna arrangement. If the SWR is high or antenna system has a problem - power may be getting reflected back into your radio. You may feel a slight burning on your lips if they contact your mic (and it has a metal guard as opposed to a plastic body or foam wind guard on it) while transmitting.

Check your mic and input cables. Shield and ground conductors in the input & mic cable may have opened and are acting like a small antenna in the cable. Noise has an easy "in" if these conductors have become broken. Try a different mic and cable if you can - or transmit PSK31 or RTTY and monitor the audio to see if it getting into the transmitter some way other than the mic & mic cable. Maybe even try using a notebook PC on battery power (further isolating the setup from the home electrical system) for a non-phone mode.

Good RF grounding is going to prove most helpful to prevent stray signals from getting into your gear. The antenna mast & support should be grounded especially if they are fed with coax cable. It's not such a big deal if you're using ladder line (for HF anyway). The same holds true for the radio as well. Most rigs have a terminal marked ground just for this purpose. This is NOT for safety ground connection that is run wire the 120 / 240 circuits for lights, heat and plugs in your house - it is for a heavy gauge (preferably copper) cable to connect to a ground rod system driven into or cables laid in / under the turf. The cable should be bare wherever it is contact with the soil to get a good earth connection. There is plenty of info out there to help you choose and create a good RF grounding system for your station.

Try your radio on straight battery power if possible (in the car but connected to the station antenna). Again, this isolates the radio from the home wiring. These aren't all easy - and presented in no particular order. Do the easy ones first and go from there. Ask questions on local repeaters and in rag chews on HF if comfortable enough. Most hams are more than willing to help out.

I hope this helps and good luck! please rate my reply. Thanks you

73-

Steve / K1SJC

Posted on Apr 04, 2011

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