[HBR] Yet Another HBR Concept

[hbr@mailman.qth.net]

Jim:

> The Ancient Ones ran into this problem, and there aren't many good
> solutions <snip> The classic 9 MHz IF/5 MHz VFO scheme works ...
> [and other good suggestions.] 

A constraint is that one ingredient of the premix is a multiple of 1.75 
Mcs because I want to use a Hahnel oscillator for the bands.   So 
the series of solutions is n x 1.75 = IF +/-  VFO to get the low end of 
each ham band.  Solutions that place the IF or a multiple of the VFO 
too near a band are no good;  ditto those for which the VFO or a 
harmonic goes through the IF; those with IF's <5 or >10 Mcs are 
pretty much out; those with IFs in use by megastations are out; and, 
I want to use clock crystals.  It's not that hard an exercise to go 
through, making the table of all solutions and then Xing out the losers 
-- but there's no assurance that they're not all losers.

I'm not stumped on this one yet -- just haven't had enough time to 
think about it. 
 
> Anyone remember the W5OMX receiver? 

*That's* the one I was trying to think of ... it was described in an 
article in either QST or CQ, maybe in the late 50's?   It was a 
premixed design -- i.e., just one mixer on the signal path -- I think the 
only one of those I can remember.  The guy was an Air Force officer, 
I think ... I think he alluded to problems with spurs but I don't 
remember the details.

Can you remind us of the conversion scheme and tube lineup?

Walt 
KJ4KV