[Elecraft] Re:L34 adjustment

Dave Sergeant [email protected]
Thu Oct 31 11:17:01 2002


I have just tried readjusting L34 according to the DMM method 
suggested by Ron.  My Fluke 77 only reads to two decimal places...  I 
found with the core two turns down from the top the reading was 
3.75V. It drops to a minimum of 3.67V with the core right at the top, 
but I cannot screw it any further to confirm it really is the 
minimum.  Possibly I need to reduce C182 slightly to give me more 
range?

I have always had the feeling that my K2 was lacking somewhat in gain 
as I found I always needed to have the preamp on (which causes 
intermod products on 40m and 30m here in Europe).  With L34 
readjusted it certainly sounds a little livelier.  When I have time I 
will check its sensitivity with my Gould generator (with calibrated 
attenuator).

73s Dave G3YMC
K2 #2498

Ron AC7AC wrote:
> 1 - On the Control Board, connect your DMM to the end of R2 the farthest
> from the top edge of the board. R2 is one of three resistors in a row near
> the top edge of the Control Board on the right side looking down into your
> open K2. You must connect the DMM to the lowest end (farthest from the
> board). 
> 
> 2 - Turn on the K2 and let it warm up a few minutes.
> 
> 3 - Tune in the 7.MHz "birdie" with preamp ON.
> 
> 4 - Adjust L34 for MINIMUM reading on your DMM. 


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