[Hammarlund] HQ-129-X Question

[Kenneth G. Gordon]

On 29 Nov 2010 at 14:03, Bob Macklin wrote:

> Part of the problem is you do not know how accurate the dial was when
> the receiver was new.

True.

> And in 1960 about the only company that had a really linear LO was
> Collins

Agreed, although some got very close, like the ARC-5s.

> With the standard GC receivers of the period all you could do was
> adjust the inductor at the low end of the band and the trimmer
> capacitor at the high end.

Yes, mostly, although in some receivers, you were sometimes instructed to 
bend the outer plates to "tweak" their tuning in between end points, and 
those capacitors were designed for that purpose. I think the HRO may have 
been one of those. I KNOW the ARC-5s were.

> Before 1960 we did not have digital
> counters. And the ones I do remember from about 1960 would not work at
> HF frequencies.

Again, true, although there were shortly made available "down counters"  or 
"dividers" you could add ahead of the basic counter to extend the range.

> Instead we used frequency meters like BC-221s.

Which are STILL very useful. I have two and use them for receiver alignment 
by setting one at the top end and the other at the low end of each band I am 
aligning. The '221 is very stable and very accurate, especially for its early 
design.

> These LOs will never have the precision of today's rigs. And they
> don't need it.

Again, true, but in Richard's case, it DOES sound to me as though it is not 
even within the specifications of the time.

So, we would like to get the problem fixed, and perhaps learn something in 
the process.

Ken Gordon W7EKB