• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • A Winner has been selected for the 2025 Radioddity Cyber Monday giveaway! Click Here to see who won!

Cobra 29 modifications

KK4JW

Active Member
May 18, 2022
44
39
28
Kentucky
I have one of the new "FM" Cobra 29's that I'm working on and I can't seem to get it to look nice and clean on my scope. Injecting 30mV 1000hZ tone into the microphone jack. With a cap/resistor swing mod, obviously the scope pattern looks like garbage, squared off. When I removed the swing mod, the scope pattern didn't look much better unless I was very conservative with the AMC adjustment, and at that point there was hardly any audio. What gives?

On my meter, I'm seeing about 4 watts with no audio, and about 15-16 with the tone on. There just isn't much audio unless I max out the AMC, and when I do that, the scope pattern gets wonky.

Limiter is intact, also.
 

dxChat
Help Users
  • No one is chatting at the moment.