HM-2140 issues

[Glen Zook]

Stupid question, but you are making this reading when connected into a dummy load?  If not, then you have to subtract the reflected reading from the forward reading to get the true power.

If you are testing with a dummy load then I would suggest measuring all of the resistors in the unit with an accurate DVM.  "Shot gunning" is going to be the most productive way because there are possibly several resistors that have changed value.

Glen, K9STH

Website:  http://k9sth.com


--- On Sat, 7/18/09, Kenneth G. Gordon <kgordon2006 at VERIZON.NET> wrote:

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?


      

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