[Elecraft] K1 band pass filter alignment

[Don Wilhelm]

Greg,

You will "peak the inductors" two times - first in receive to get then 
into the approximate correct position, and then in transmit for the 
final setting.
NOTE WELL - you will peak the inductors if you have the 2 band board, 
but if you have the 4 band board, you will be peaking the capacitive 
trimmers instead - and for the 4 band board, follow the band order - 30 
meters must be peaked before 40 meters and 15/17 meters must be peaked 
before 20 meters.

OK, what does "peaking" mean - for receive, you will simply adjust for 
maximum signal (or band noise if you cannot hear any signals)  You can 
use another QRP transmitter running into a dummy load as a signal 
source, or if you have a signal generator, that is ideal - listen to the 
signal and adjust the inductors (or capacitors for the 4 band board) to 
achieve the strongest received signal

On transmit, things are a bit easier - you have already pre-set the 
tuning during receive, so this is just a matter of refining the tuning - 
in other words, you should not have to move the adjustment very far.  
Set the power (menu OUT parameter) to about 1.5 watts, and then adjust 
for the maximum power output.  Problem - if the power output rises to 
more than 5 watts, the peak will "hide". and you will reach the power 
output capability of the transistors rather than finding the peak, so 
exit TUNE and re-enter (or in the case of the K1, often repetitively 
tapping the WPM- button will reduce the power) keep the power level low 
so you can discern the peak.  You will find a point where the power 
output increases, and then decreases as you adjust the inductor (or 
capacitor).  The point in between where the power is maximum is the peak 
that you are searching for.

73,
Don W3FPR

ki4bbl at cox.net wrote:
> I love this rig already!  My wife was sure I was having an affair last  
> night when I came in from my man cave just smiling ear to ear because  
> my led backlight lit up, and I was able to play with the controls.  I  
> was most notably giddy when I aligned the VFO by manipulating the L1  
> toroidal....I love electricity, but I digress.  I am on page 40 doing  
> the band-pass filter alignment.  What does it mean to peak the  
> inductors?  I am not sure what I am looking for there.  Thanks so much.
>
> Greg Doughty
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