"AM" vs. DSB

[Jeffrey Herman]

On Mon, 17 Nov 1997, Joel Govostes wrote:
>
> I never did monitor my own signal, (and the rig operated fine,) but now I
> wonder - was the rig only generating the sidebands (both); i.e. was there
> no carrier generated in that case (true DSB)?  Or would there have actually
> been a carrier, perhaps reduced, compared to a "normal" AM  transmitter -
> signal.
>
> Perhaps the DSB was merely a feature to allow for AM compatibility on the
> air(?) -- but I never asked -- would the other stations have had to use a
> BFO to copy me?

I recall back in the mid to late 70s, we (USCG radio stations) were
running DSB on 2182 kc - this was due to the worldwide transition from
AM to SSB on the 2-3 Mc maritime voice band. DSB was compatable with both
modes. Carrier was not completely supressed - don't recall what pct of
it was actually there, though.

(2182 kc is the international MF/HF voice calling & distress freq'y;
it's the voice equivalent to 500 kc CW.)

Jeff KH2PZ / KH6

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