| Don Bowey 2007-07-06, 10:33 pm |
| On 7/6/07 12:15 PM, in article
isw-C7349C. 12150506072007@newsg
roups.comcast.net, "isw" <isw@witzend.com>
wrote:
> In article <C2B3C3A0. 6DC14%dbowey@comcast
.net>,
> Don Bowey <dbowey@comcast.net> wrote:
>
>
> Well, OK, the phase must at least bear a constant relationship to the
> one that created the signal. If you inject a carrier that has a
> quadrature relationship to the one that created the DSB signal, the
> output will be PM (phase modulation). In between zero and 90 degrees,
> the output is a combination of the two. If the injected carrier is not
> at precisely the proper frequency, the phase will roll around and the
> output will be unintelligible.
Not unintelligible.... Donald Duckish.
On a more practical side, however, most receiver filters for ssb will
essentially remove one sideband if there are two, and can attenuate a
carrier so the local product detector can do it's job resulting in improved
receiving conditions. But this is more advanced than the Ops questions.
Don
>
> Isaac
|