I need to tap the collective wisdom of this group regarding an
interesting problem.
I have an ACOM 700S solid state amplifier that is driven either by an
Orion (565) or an Orion II (566).
When I use the 565, the amp faults on 10 meters only. The protection
fault indicates high SWR and excessive drive current. This happens
regardless of the amount of drive power from the Orion, even with the
PWR control turned all the way down, providing about 6 watts of drive.
On CW, the fault occurs on key-down, while on SSB and FT-8 the amp
faults on key-up, at the end of a transmission. Engaging the TUNE button
does not produce the fault. All bands other than 10 meters work normally.
Using the O II, none of this behavior occurs, and the amp plays happily.
Steps taken without solving the problem include:
*Replace coax jumpers (they needed it anyway)
*Replace arc plug in lightning arrestor
*Remove all components from the signal path (watt/SWR meter, tuner, coax
switch, lightning arrestor) and connect directly to the coax run to the
antenna
*Connect to a different antenna fed through a separate coax cable
*Control the amp using Keying Loop 1, Keying Loop 2, or the Amp Key output
* I don't have a good oscilloscope, but to the best of my ability to
observe, the CW waveform was well-shaped and didn't show any spikes in
power.
All of this points to an issue with the Orion on 10 M - what else should
I look at?
Thanks & 73,
Bruce KM2L
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