Fw: [HBR] Which HBR is 'Better' or 'Best'?
Sandy and Kees Talen
[email protected]
Thu, 18 Apr 2002 10:48:10 -0500
I think it's just a progression of designs with the HBR-16 and it's
modifications (Eddystone 898, etc) as the most widely built. The
later HBR-12 was probably as good, but unless you put it in a
larger enclosure (or fabricate your own slide rule dial), you can't
use the Eddystone 898. My opinion, the best of the series was the
last HBR-13C with the 7360 product detector, series IF tansformers
and a stage of 1st IF amplification. The receivers are all very sensitive
but selectivity could be improved (higher "Q" circuits, steeper sides
on the passband ....like with a mechanical/crystal filter, etc).
ALL of them are fun to build/restore/use and a lot depends on what
memories you have. Several people have indicated an interest in
building the HB-67 from the ARRL Handbook and others.
Attached is a note from Jim, N2EY
73s Kees K5BCQ
-------------------------------------------------------------------------
--------------------
Just a quick note....
Besides the "Miser's Dream", Squires and Goodman articles, there is one
more
"must read". QST for February, 1972 has an article titled "An
Experimental
Receiver For 75 Meter DX Work" by Doug Blakeslee, W1KLK (SK).
This receiver is very similar to what Cliff wants to build. It uses four
tuned circuits before the mixer, and a low-gain grounded-grid RF stage.
Mixer is a single-ended 7360. The IF is 455 kHz, based on a Collins
mechanical filter. Lots of good circuits, as well as design philosophy
and
layout ideas.
More to follow but I'm out of time
73 de Jim, N2EY