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Ham Radio/AC Interference

Yahoo Message Number: 2450
Like Many here,I've had problems with Radio Interferance (RFI) from all of the non-shielded electronics in my '99 Magna, but as an amateur radio operator I've got an additional problem. My shortwave transmitter seems to interfere with the AC electronic thermostat.
When Transmitting on certain frequencies, I can cause the AC compressor to either kick-out or the entire ac system to stop. After a time it resets and starts again. Similar problem occur with the voice warning system - I can cause it to start speaking a random message when I transmit. I assume that a grounded mesh cage around the open ciruit boards above the passenger area will correct that, but would like any suggestions on handling the AC problem. I've had suggestions of putting .001uf capacitors around the control lines.
Any experience or suggestions would be appreciated.

Bob Ryan
 

Re: Ham Radio/AC Interference

Reply #1 –
Yahoo Message Number: 2456
Bob

I am a ham as well and had similar problems in other vehicles (4- wheel). Each one was a little different in the actual solution. But all of them involved grounding. Some were resolved in providing the best and shortest ground to the antenna and others involved additional ground straps to the chassis. One vehicle I had to provide an additional ground to the instrument panel as well as provide a direct ground strap for the antenna. My HF signal was causing all my gauges to go crazy. I do not rely on the chassis to conduct a good ground. I use an ohm meter and check the between various point on the chassis and the engine block. You would be surprise in how much isolation or resistance you have is various points on a vehicle chassis.

I am currently putting in my HF, VHF & UHF ham gear in my recently purchased 2000 Allure. I am inerested in what kind of installation you have and where your antenna(s) are located and oriented.

Just an observation and idea.....Both the voice system and the thermostat are on a DC circuit I believe. Could it be that you have an RF signal that is running on you DC circuit? Try adding a torroid to the DC line used to power your radio(s). I have used this solution in the past. I now use shielded wiring for all my DC power leads for my equipment.

Let me know how you make out and what resolves your problem. For I may be facing the same thing soon.

Jim Hughes, KC4FWS
Jacksonville, FL
2000 Allure #30511