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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: How does a mixer work?
References: <3DB5EAE2.firstname.lastname@example.org> <email@example.com>
Date: Wed, 23 Oct 2002 03:10:54 GMT
NNTP-Posting-Date: Tue, 22 Oct 2002 20:10:54 PDT
> Chris wrote:
> << Why bother when you can synthesize the transmitted frequency and the
> receiver can synthesize the LO and the carrier to reinsert all quite
> easily. >>
> First let me say up-front that I like ssb for many reasons and I've worked on
> many generations of it in telecommunications, and as a means of business
> communications from interesting, far away places, and in ham radio.
> What I don't like about it is that it is not simple to tune-in a station to
> the extent that you can recognize a person's voice. In the 50's, when ssb was
> somewhat rare on the ham bands, I could casually tune around and find my
> friends and acquaintances, who were using good-old full carrier AM. Now that
> HF is almost entirely ssb, it's near impossible to randomly find anyone. It
> has made the world just a little more impersonal. Adding a little carrier at
> the transmitter and a sync circuit at the receiver would, in my opinion make
> ham radio more enjoyable again.
> For commercial, point-to-point use of ssb, having sync would be "nice" but not
> especially valuable.
Minor detail. I'm called Chuck rather than Chris.
You remind me of when we carried some Apollo traffic in 1969 when I was
winding down counting days until I left. The traffic was a PTT voice
channel. With independent sideband even if there was a carrier, we could
hardly switch it on and off and the voice channel itself could not carry
the PTT keying. The solution was to carry the keying information in one
of the 48 remaining RTTY channels on the same transmitter. The RTTY
channels were FSK but the receiving end wanted a CW keyed signal. I left
the FSK channel connected wired to marking and used a relay to key the
output on and off. That was a case where lack of a carrier was a bit
embarrassing. PTT is normally done by keying the carrier. I set up two
30KW Collins transmitters for this. One for normal use and one spare.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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