I have an RF-110A and use it in every contest. It is easily modified for
amateur use. The most difficult part is making up multi-conductor cables if
you don't have the plugs to connect the power supply and the r.f. deck.
I have two articles:
1. Converting the amp for amateur use
2. Correct wiring of the RF-124 power supply.
Just be sure you have an excited that you back down to 6 - 8 watts or you
will have to build an attenuator, which in itself is not difficult.
By the way, this RF-110A has the lowest 3rd order IMD specs of any of the
"big" amps.
I use in in RTTY contests with 1,500 w out all day and all night with no
complaints or failures.
73
Mike
W0YR
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