Hight picth noise on 80M

  • 1
  • Question
  • Updated 2 years ago
Only on 80M a high pitch sound happens on transmit when monitor is turned on?
Photo of Bill -VA3WTB

Bill -VA3WTB

  • 2762 Posts
  • 610 Reply Likes

Posted 2 years ago

  • 1
Photo of Bill -VA3WTB

Bill -VA3WTB

  • 2762 Posts
  • 610 Reply Likes
for more info, the noise is coming from the mic element as little as 1 watt out, does not do it on dummy load. Still only on 80M.
Photo of Walt - KZ1F

Walt - KZ1F

  • 3040 Posts
  • 643 Reply Likes
I would take that to mean it's rf radiating back into your shack. Did you change anything with regard to your antenna or proximity of it to your shack? Oh wind storm?
Photo of K1UO - Larry

K1UO - Larry

  • 773 Posts
  • 126 Reply Likes
Sounds more like audio feedback from the monitor to a live mic element.... Is VOX on when you go to 80M..  Is the anti-vox level set?
Photo of Walt - KZ1F

Walt - KZ1F

  • 3040 Posts
  • 643 Reply Likes
Yet transmitting into a dummy load cured it.
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9148 Posts
  • 3466 Reply Likes
And your radio is?
Photo of Bill -VA3WTB

Bill -VA3WTB

  • 2762 Posts
  • 610 Reply Likes
This is for a friend Tim, It is a 6500. Even at 1 watt it chirps through his mike, any mic he uses. But on a dummy load it stops. He has the GPS installed. I told him he should make a call in but would see what I could find out here as well.
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 9148 Posts
  • 3466 Reply Likes
"But on a dummy load it stops."

Sounds like RF ingress to me.
Photo of Bill -VA3WTB

Bill -VA3WTB

  • 2762 Posts
  • 610 Reply Likes
That is what i said too, but he can't see how with only 1 watt. I told him to disconnect the antenna coax for his GPS and try it. It must be getting in somewhere. could be in his mic wires and connections,,thanks Tim