[Premium-Rx] Original use of Premium Radios

[Gary Mitchelson - N3JPU]

I think the 21.4MHz IF was used more than the 455KHz IF. One use was to run
the unfiltered 21.4Mhz IF (e.g. broadbanded output) to a "IF to tape
converter" (WJ, CEI, Regco and others made these) which would take say a +/-
.5Mhz output (20.9MHz to 21.9Mhz) which would correspond to a 1MHz chunk of
spectrum of interest, and convert it to 0-1MHz. This in tern would be
recorded on single channel of a 1", 28 Track IRIG Instrumentation recorder.
You would have many of these receivers going to the same recorder, not all
28 tracks as some would be used for ref tones and time code, but 20 or so.

Later when you played the tape back you would take the 0-1Mhz output and
send it into a receiver that covered the 0-1Mhz range and you could tune
through your 1Mhz spectrum (actually 20MHz, 20x1) after the fact.

Worked well.

Gary

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Blair Batty
Sent: Friday, June 04, 2004 19:38
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] Original use of Premium Radios


Hi All:

Given the fine specifications and special features (e.g. 455 IF out, remote
control, simultaneous Upper and Lower sideband) of  many of the premium
radios I wonder how they were originally used, and with what equipment?

For example, I've been told that in Military or an Embassy, one (of a bank
of these radios) might be permanently set to one frequency, in the ISB mode.
The Upper sideband would  drive one teletype and the Lower sideband another
teletype.

What would the 455 Hz IF Out be useful for? How else would the radios be
used, besides the usual voice communications?

Sincerely
Blair Batty
Canada