= = = "Jeff" wrote in message
= = = ...
Hi,
Does anyone remember a weird compact antenna that was featured in a 60's (or
early 70's) edition of "73" magazine. Had 2 etched PCBs (like spaced plates)
mounted inside a plastic bucket, and fed with coax?
Does anyone know more details of this?
JEFF
ZL3TNV
..

JEFF [ZL3TNV]

You may wish to try posting this same question 'separately'
on the: "Rec.Radio.Amateur.Antenna" NewsGroup.

RRAA= http://tinyurl.com/2hlw7
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&group=rec.radio.amateur.antenna

hth ~ RHF

..

I seem to recall that Hammond Organ put their reverb unit's springs in oil, to
dampen sudden changes.

And wasn't Collins' mechanical IF filter a similar device as you all are
discussing?

Bill, K5BY

On 07 Jul 2004 05:36:12 GMT, (WShoots1) wrote:

And wasn't Collins' mechanical IF filter a similar device as you all are
discussing?

Bill, K5BY

Hi Bill,

Only in the abstract, yes. Same physics, only more precision and at a
higher frequency (and much harder to make go BOING) and to a different
purpose (steep selectivity skirts for better fidelity).

73's
Richard Clark, KB7QHC

at a higher frequency

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

73,
Bill, K5BY

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).

73's
Richard Clark, KB7QHC, ET1

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

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

Richard: 455000 cps ;-)

LOL Also: 0.455 Mc.

Michael: Didn't the R390 have a 500KHz IF?

That sounds familiar. Could that have been one of the differences between the
390 and the 390A?

73,
Bill, K5BY

On 10 Jul 2004 05:22:58 GMT, (WShoots1) wrote:

Richard: 455000 cps ;-)

LOL Also: 0.455 Mc.

Michael: Didn't the R390 have a 500KHz IF?

That sounds familiar. Could that have been one of the differences between the
390 and the 390A?

73,
Bill, K5BY

Hi Bill,

Close, but not in the 390 series. Collins built similar rigs such as
the 75, 51 and R388 (and maybe R389) series only some of which used a
500KHz IF in a fantastic variety of double, triple, and quadruple
conversion versions.

73's
Richard Clark, KB7QHC