[Elecraft] Re:L34 adjustment

[Ron D'Eau Claire]

OOps, I bet you were using a narrow bandwidth setting, Dave. My
apologies. I rewriting my procedure quickly, I left out the instruction
to select a wide bandwidth.  If you narrow down the bandwidth, you will
start reading a "peak". That's because the filter suppressing the
wide-band noise. At wide bandwidth settings, peaking the "birdie"
suppresses the background noise producing a dip in the AGC voltage
reading where the birdie is strongest and the signal-to-noise ratio is
best. At narrower settings the AGC won't see the wide band noise and
reacts only to the birdie. I have a hunch you were using a narrow enough
bandwidth to be reading the 'peak'. 

I set mine with a bandwidth of at least 1.6 kHz. If you have the SSB
module installed, the OPT1 filter is best.  

I am sorry for the confusion. 

BTW, several ops pointed out that it is actually easier to get a DMM
probe clip on R4 nearer the bottom of the control board looking in from
the top. It's almost directly below R2 and the other resistors. at the
top. That does work just as well. 

Ron AC7AC
K2 # 1289

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