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If the radio and internal amp are producing a clean SSB signal and the watt meter returns to zero between words, this greatly reduces the chances of it being any type of self oscillation and makes ExitThirteen's diagnosis much more likely.

The only difference is I think the 2990 radio places the low power carrier adjustment on the switch board mounted to the front left panel. The number for the pot was VR-601. I'm only 90% sure of this. If you can't find the low power adjustment on the main board, then it's 100%.

[QUOTE="Shockwave, post: 443340, member: 10882"] If the radio and internal amp are producing a clean SSB signal and the watt meter returns to zero between words, this greatly reduces the chances of it being any type of self oscillation and makes ExitThirteen's diagnosis much more likely. The only difference is I think the 2990 radio places the low power carrier adjustment on the switch board mounted to the front left panel. The number for the pot was VR-601. I'm only 90% sure of this. If you can't find the low power adjustment on the main board, then it's 100%. [/QUOTE]

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