Is the Bird wattmeter and element rated for 50MHz?
John KK9A
Richard Lamont richard at lamont.me.uk
Thu Jun 1 10:05:27 EDT 2017
I've been trying to calibrate the KPA500 wattmeter. I'm using a new Bird
43 meter with new 500A and 500H elements and a 1kW Bird Termaline load,
connected by the shortest practical lengths of co-ax.
Everything is fine, except on 50 MHz, where there isn't quite enough
adjustment range available. At 500 Watts (as indicated on the Bird 43)
and a PWR ADJ setting of 100, the KPA indicates just 325 Watts.
Adjusting PWR ADJ from 100 to 120 (the maximum available) brings it up
to 480 Watts.
This is near enough, but is it a known problem that the range of
adjustment isn't quite enough?
73,
Richard G4DYA
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