RFI getting into switching power supply when transmitting

[Alain Theriault]

Hello everyone.. I'm currently running into a small problem.. When I'm transmitting with my radio, there is RFI getting into my switching power supply. I can pretty much hear everything i'm saying and eventually, the power supply turns itself off and I have to turn it off and turn it back on to turn on the power supply again. My antenna is 70 ft up o a tower and I'm running rg213 for coax. The switching power supply is a jetstream jtps45 and the reviews are good on it. My radio is a 2970n2. How can i eliminate the RFI getting into it? I tryed using a ferrite core I took out of an old tube tv and wrapped the ac power cord several times and it's still coming into the power supply.. Any suggestions?

Thanks again!
Al

 

[sp5it]

Choke balun at antenna feedpoint and another at the radio plus proper grounding system.
Also EMI filter between radio and PS.
Mike

 

[sonoma]

what Mike told you is a good stating point. good ,luck my friend. this may be a easy fix then again it may not. grounding will be your 1st priority.

 

[Old_Crow]

I only heard of this happening if there was a ground loop or it can be a bad power supply or cable. Make sure none of your cables are bunched together making round coils then to test try to remove ground pin from A/C plug using those adapter plugs. Make sure your antenna is grounded with a ground rod close to your station and last have your station and any antenna switches also grounded with a braid or flat stock. If you still have feedback , at the antenna feed point I made a small choke, rapping coax around 8 times in a 6 inch diameter coil. Lastly check for damaged cable or bad connections. Hope this helps, Good luck. Old Crow

 

[vkrules]

Problem will almost certainly be CMC.( coax is radiating). Choke and grounds as sp5it
said should fix it.