[HBR] Yet Another HBR Concept

[hbr@mailman.qth.net]

Some progress, in between foolish forays into 20 m coilwinding for 
the 1MHBR ...

1.  The best cap for tuning the front end is 5 gangs -- so looks like I'll 
replicated the front end of the G2DAF Mk II, including the push-pull < 
unity gain RF stage.   The 5th section tunes the output of the 
oscillator/premixer chain.   This differs from the -DAF set which was 
a conventional tuned 1st IF approach.

2.  I've continued to doodle on the conversion scheme.  Jim is right -- 
the one I mentioned last time isn't good, but I haven't found a 
satisfactory one yet.   I'm trying to use common microprocessor 
crystal frequencies for the 1st IF but most of those frequencies are in 
use by megabroadcast stations ... not impossible to use, but you'd 
sure rather not start there.   And I don't want to get the VFO freq. too 
high either -- it's a lot easier to stabilize a VFO in the 5 Mcs range 
than at twice that frequency.   Plus the cap I'm looking at for the 
VFO is fairly large per section so it's a good bet for a lower freq. 
design.

Back to coilwinding.   

Walt 
KJ4KV