[Elecraft] NG0R - K2 160m alignment problem.

[John Hoaglun]

Don and the members of the list,

I am still troubleshooting the alignment issue. I am better now than I was a
couple of days ago.  Don and I have been comparing notes. I have removed the
ATU from the circuit and tried some other things. After some poking around
with the RF probe I have confirmed that the issue is within the 80/160m band
pass filter. (Lots of RF into the filter... very little coming out.) I have
been messing with C13/C14 making sure that they have a good connection.

After some poking around with the probe I was noticing an occasional
oscillation at which point the RF power levels would change and I would see
some significant RF.

It seems like L4 is extremely sensitive after the addition of the 160m
module and C13/C4. Now if I move my hand or a plastic screwdriver by it the
circuit is detuned or goes into a slight oscillation. That made it extremely
hard to tune up the band pass filter initially. After some tweaking I am now
seeing 11-13.5w out on 80m & 160m without the ATU in the circuit. I am going
to add the ATU back into the circuit and do some more testing.  (The ATU was
not the issue... it was removed as part of the troubleshooting steps.)  

Has anyone else noticed L4 being ultra sensitive after the addition of the
160m module?

Thanks, JH


-----------------------------
John Hoaglun
NG0R - EN25
http://www.hoaglun.com