HM-2140 issues

[Kenneth G. Gordon]

I need some help from the gang here on the subject "PEP" 
watt-meter.

This is NOT the MN-2140A....just the earlier HM-2140.

The main problem I am having with it is that it reads AT 
LEAST 30% high, and I can see no way to more accurately 
calibrate this thing.

For example, when my SB-200 is reading about 1014 watts 
input via its plate and HV meters, the output is reading 
1500 watts....which is clearly impossible.

Assuming that the 1014 watts input is reasonably accurate, 
the greatest the power output could POSSIBLY be is 750 
watts, and I really doubt that it is that high.

The manual is absolutely no help on this matter.

I strongly suspect that some of the resistors in the SWR-
meter part of the circuit have gone way high, but cannot 
figure out which ones to examine, and I really don't want to 
"shot-gun" them all.

Does anyone have any suggestions?

Also, am I correct in saying that this (and others of its kind) 
are really Peak-Reading Wattmeters, and not actually PEP 
Wattmeters, since they don't really measure the envelope.

Of course, I have had exactly 2.5 hours of sleep in the past 
48 so I am probably not thinking too clearly.

Ken Gordon W7EKB

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