[Hammarlund] HQ 180 RF OSC ProblemsQ

[Mike Souhrada]

Dan wrote:

>Has anyone who has tried to do an HF alignment on a Hammarlund HQ 180, had difficulties aligning the top two bands? I am finding it hard to get the HF Oscillator to get to 15 mhz. on the 7.85 - 15 mhz. band, and 30 mhz. on the 15.7 - 30 mhz. band.
>It`s like the HF Oscillator just won`t go there.
>I have installed an Almost All Things Digital freq counter to the HQ180 and it works fine and doesn`t hinder the HF 
>
Dan
Not sure this will help but I had a lot of trouble getting mine to even 
oscillate.
After hours and hours of testing I found ,what appeared to be, a poor RF 
ground in the Osc circuit.
Taught me a lesson, continuity to ground with a VTVM or what ever may 
not tell you anything at RF.
Much different animal.

Anyway I found a number of  chassis connections in that area  with good 
DC  ground and  thought
I'd try and tighten up the chassis screw connections. BANG everything 
started to happen right.
There was enough corrosion between the star washer and the chassis to 
block RF!....
This was after much component testing - So I suspect a similar thing in 
your case; especially at the
higher levels of the two two bands.
Give it a try and see what happens.

Mike
Iowa
HQ180AC  my keeper, well one of them!