Re: First Bell System microwave link?
- --- In firstname.lastname@example.org, "ozob99" <ozob99@y...> wrote:
> --- In email@example.com, "Albert LaFrance"relative.
> <albertjlafrance@c...> wrote:
> > ----- Original Message -----
> > From: "ozob99" <ozob99@y...>
> > To: <firstname.lastname@example.org>
> > Sent: Wednesday, March 12, 2003 10:42 AM
> > Subject: [coldwarcomms] Re: First Bell System microwave link?
> > Your finding about the link's 8-channel capacity may be a very
> > clue. Specifically, it makes me wonder if perhaps the California
> link used
> > the military (Signal Corps) AN/TRC-6 equipment or a close
> > The AN/TRC-6 was one of the first - maybe the first -
> > microwave radio systems, being deployed toward the end of WW-II.As
> > recall, it carried around 8-12 voice channels on a radio channel
> the 4mw.
> > GHz band, using a klystron RF source with an output of about 200
> > Rather than the frequency-division multiplexing used in
> > broadband systems like TD-X (the AT&T Boston-NYC experimental
> of 1947)of
> > and TD-2, the AN/TRC-6 sampled the voice channels and
> > time-division-multiplexed the samples into a
> > signal. The combination of sampling - usually associated with
> > communications - and analog modulation is an interesting feature
> thatI found a pic of the TRC-6:
> > system.
> > Albert
> Evidently this was the case, the 8 channel TRC-6 was developed by
> AT&T; as detailed on this page:
This site has tons of pics & specs on military comms gear.
- Another article on Catalina microwave: