[MRCA] ARC-2A loading into 50 ohms

Mark mbdittmar at comcast.net
Sat Jun 8 15:31:39 EDT 2013


Hi-

I recently fired up an ARC-2A transceiver I have here,  and just can't seem to load up to full power ( 180 ma at 500 VDC ) with it on 80 meters...best I can do is about 100-110 ma.  The tubes are good and my PS is more than capable of suppplying the current.  I know they were designed to run into a reactive load and a lower resistance, so I've tried adding series capacitance in series with the antenna,  then tried some shunt capacitance, but still peak out at about the same value of plate current.

Anybody use one of these with a 50 ohm antenna ?  What if anything did you use to obtain more amp loading ?

My antenna is an inverted L, fed at the base with an autotuner...so should generally look like 50 ohms at the shack end of the coax.

Thanks and 73

Mark ABØCW
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