Les,
Check to be certain you have installed Q6 and Q7 the correct way 'round.
Second, what is the value of C31 in your kit? It was recently changed
to 0.22 uf to cure an oscillation that occurred in a few amplifiers with
the new T-R switch design (Rev D manual).
The kits available in February may or may not have had the .22 uf C31
packed. If you have a .033 uf cap at C31, request a .22 uf cap for C31
from [EMAIL PROTECTED]
73,
Don W3FPR
Les and Lynn wrote:
Folks,
I solved the problem with the SWR Bridge null adjustment (CI) by reflowing a bunch of solder joints (i.e., Don's usual suggestion) around T1, R21 and R22.
However, now I have a new problem - I am drawing to much power in the transmit
tests of on pg 50 of the KPA 100 manual. My metered Astron switching power
supply shows 25 Amps on key down (2-3 sec.) at 100 watts. Calculating the
amperage across R7 shows 21 Amps - still to much. Q1 seems to get
preferencially hot compared to Q2 during the 2-3 sec.key down. The signal
sounds great in a remote receiver. Changing the values of R26 and R27 doesn't
seem to effect the power reading.
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
