[Collins] KWM-2A low output solved

[Bill Abate]

To all who responded on or off the list, thank you for your comments. 
Hope the recounting helped some of you.  As far as my tune up procedure, 
don't forget I was tuning into a 50 ohm dummy load.  The 50 ohm setting 
should have been valid.  Why else put that marking there?  I did rock 
the loading control but it did not make much difference.  The 50 ohm 
setting was that far off.  I used a wattmeter as well as the plate meter 
for tune up.  It wasn't until I moved the load control appreciably that 
the output picked up.

I went back and reread the tune up instructions.  Collins does not 
mention the load control setting until the final adjustment.  Then you 
adjust it for 230 ma.  Again, if 50 ohm setting was close, it should 
have worked out fine.  Since the instructions do not give a starting 
point for load it is reasonable to start at the 50 ohm marking.

Quoting from the Service Instructions for loading trimmer adjustment, 
"These trimmer capacitors are adjusted to provide the required total 
output capacity for matching 50-ohm antenna loads on the amateur bands 
with the INCR LOAD control set at the 50 ohm mark.  Normally, they will 
not need adjustment since, when the PA is properly loaded, the tuning is 
relatively broad".  To me the refers to the broadness of the loading 
control not the broadness of the impedance matching.

Hope this is of some help.

73,

Bill, K3PGB