On 8 Jul 2004 18:46:00 GMT, (Michael Black)
wrote:

Richard Clark ) writes:
On 08 Jul 2004 04:38:58 GMT, (WShoots1) wrote:

at a higher frequency

Roger, Richard, much higher. Hi Like 455 kHz. (Or was it kc back then?)

73,
Bill, K5BY

Hi Bill,

455000 cps ;-)

Used in the Collins R-390 and URC-32 (course material for the Navy's
ETA school, 6 week N branch section A4).

Didn't the R390 have a 500KHz IF?

Michael

Hi Michael,

Hmm, three chances to be right (this is a triple conversion receiver)
but, no, 500KHz is not one of them. Consult:
http://www.r390a.com/VARIF.htm
for the fascinating tale of variable IFs and band switching. This
gave my students hours of entertainment in playing with the
mechanics/electronics of tracking the tuning indicator (and prepared
them for my class in the SRC-20, a synthesized mechanical nightmare of
gears and shaped capacitors).

There are a world of IFs to choose from, certainly, with surplus and
otherwise exotic gear consult:
http://www.nzvrs.pl.net/aaa/ifreqs.htm
I've owned the BC453 with an IF of 85KHz that I used to tune to a
cheap SW (Knight Kit Star Roamer) set's IF for a poor man's double
conversion.

73's
Richard Clark, KB7QHC