Silly question... Same symptoms on dummy load? Malcolm F5VBu
On 2/13/2020 9:30 PM, John Swartz wrote:
I have an Omni VI Plus that has developed a problem on transmit. Can
anyone on this list help me, please?
When I power up the transceiver, in CW mode (I only operate CW), it
will generate 80-90 watts output with the PWR control fully clockwise.
After several transmissions over a course of barely 10 minutes, power
output progressively declines and the ALC light dims and goes out. If
I reduce the power setting to about 3/4 or less, the ALC light will
come back, but power output will continue to decline and as it does
so, the ALC light will continue to dim and extinguish. This happens
on all bands, but not at the same rate. On 160, 80, 12 and 10 meters
the decline is much more pronounced and rapid, 40, 30, 15 and 17
decline a bit less precipitously, and 20 less so. Even so, after
about 15 to 20 minutes of intermittent CW, there is very low output on
any band and the ALC indicator does not light at all.
If I start operating at reduced power, I can rely on the output to
maintain its level for a greater amount of time, but it does decline
after a while, but I couldn't count on it for any extended operating
period of more than, perhaps, 30 or 40 minutes.
Can anyone give me any ideas about what is going on, and how it might
be fixed? The receive function is not affected. I would seriously
like to keep this rig working if I can.
Thanks for your time and attention, 73, John WA9AQN
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