"gb" wrote in message
...
"Dale Parfitt" wrote in message
news:FNl0e.16399$b_6.6287@trnddc01...
I had posted this elsewhere, and it has created some interesting
feedback.
Based on Wes W7ZOI's Progressive RX from the late 1980's. A wonderfully
balanced design to which I added some bells and whistles I like in a
receiver.
These are some shots of my almost finished 1980's theme HF receiver.
All stainless hardware, teflon wiring. Rock stable VFO, homebrew xtal
filters ( 5/2/5/0.5), selectable and defeatable AGC, notch filter, tone
control, QSK input,built in front end BP filters for each band,
preselector,
AM/USB/LSB/CW.
Enjoy:
http://www.parelectronics.com/pics/W7ZOI11%20copy.jpg

http://www.parelectronics.com/pics/w7zoi13jpg.jpg

http://www.parelectronics.com/pics/w7zoi14.jpg

http://www.parelectronics.com/pics/w7zoi15.jpg

Dale W4OP
for PAR Electronics, Inc.

Dale -

Very nice. Looks like you built the RX .. that I am still designing since
1980 and reading Wes' articles. :-)

I see you used a 9 MHz IF.
Any particular reason that you used separate (LO) oscillators for each
band
(rather than a single oscillator with switchable crystals) ?

The cabinet look a bit like some LMB enclosures.

Greg
w9gb

Hi Greg,
I did not deviate a lot from Wes's original PR design- and that used a 9 MHz
IF. I also had a bunch of xtals for the filters- so just stuck with it. It
also allowed the 49M LO to double as the 160M L.O.
F.A.R. circuits had the L.O. boards already made up, so I went with that. No
reason I suppose, if one had an osc. that would paly well over the entire
range w/ good spectral purity that a single L.O. and PIN diodes could not be
used for switching. Would have saved on some SMA connex!
The side rails and cabinet, and matching speaker cabinet (not shown) are
from a junker SB-303 I found on E Bay ( have another for the mating TX once
I recover). All the rest- front panel, subchassis, rear panel awere done in
my machine shop.
I know of the LMB you are talking about - nice stuff, but hard to come by in
larger sizes these days I suppose.
They were steel I thnk, whereas the Heath stuff is aluminum which I find a
lot easier to machine.
Dale W4OP