Buzz on Tx, only on 10 meters

  • 1
  • Problem
  • Updated 2 years ago
  • Solved
I am getting a buzz from my new 6300 on 10 meters when I transmit over 40 watts. It sounds like 60 Hz relay chatter. All the other bands are ok. Same symptoms with the antenna tuner on or off, into a dummy load or not. If I keep it below 40 watts I can run my amplifier without any problems which leads me to believe it is not a RFI issue. Power supply is a 35 amp Samtec. Any clues?
Photo of Jeff - AK0DX

Jeff - AK0DX

  • 8 Posts
  • 1 Reply Like

Posted 2 years ago

  • 1
Photo of Jeff - AK0DX

Jeff - AK0DX

  • 8 Posts
  • 1 Reply Like
Official Response

Resolved

I removed all the cables except for the CAT5, Power, and Coax connected directly to a Dummy load. The problem went away. Then I added the system cables back in one at a time to find the culprit. I isolated it down to an RCS-4 antenna switch. I used it on the input side of the amp to switch between different radios. Replaced the switch and the problem went away.  RFI was the problem, but no need to add ferrites. This was the first time I tried the rig on 10 meters. Thanks for the suggestion Steve and Tim please feel free to close the ticket. I tested all the bands with no issues.

(Edited)