Have a look at http://www.kangaus.com/kk7b.htm
At 01:50 11/12/2009 -0800, you wrote:
This problem (generating the 90 degree phase
shift audio) is all that is keeping me from an
experiment to generate a SSB signal using a
little known technique I ran across in an old
QST. It seems that a phase modulated FM signal
can be combined with amplitude modulation with
the audio 90 degree phase shifted and generate a
SSB signal. The experiments referenced wound up
with a SSB signal with full carrier.
My first foray into sideband operation back in
the late '50s was with a command transmitter
with the grids modified to push pull and
applying push pull audio to the screens. This
generated a double sideband suppressed carrier signal.
I suspect that I could modify a GE Prog
transmitter by rewiring the grids of a 60 Watt
final to push pull and applying push pull audio
to the screens and applying 90 degree phase
shifted audio to the normal phase modulation
input would generate a SSB suppressed carrier signal.
I suspect the pre-emphasis in the phase
modulation circuit would have to be defeated, or
does a phase modulation scheme automatically generate the pre-emphasis?
73 - Jim W5ZIT
--- On Wed, 11/11/09, DCFluX <dcf...@gmail.com> wrote:
From: DCFluX <dcf...@gmail.com>
Subject: Re: [Repeater-Builder] acssb - how does
it work and is it possible for the hobbyist to scratch build
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, November 11, 2009, 9:02 PM
I was playing with the ideas of making adapters,
but it is supprisingly difficult to throw audio
exactly 90 degrees out of phase over a broad frequency range.
