Brass Pounder wrote:
> A friend of mine (W6AAN) reported a problem with his Alpha-91b (2XGU-74B,
> made in Bulgaria): when attempting to send CW at speed more than 5 WPM at
> 1500W output, the protection kicks on. Nothing similar happens at output
> power less or about 700 W. The same RIG (TS870S) works just fine with a
> different amplifier.
Put a scope on the input and look for overshoot on the leading edges of the
dits. I am not sure if the 870 is one of the bad actors in this respect. If
it
is like the TS850 with a separate power output and carrier level control, try
cutting back the carrier control until output just starts to drop off. This
will reduce the possibility of overshoot.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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