[Boatanchors] Feb 1964 CQ?
wh7hg.hi at gmail.com
Wed Feb 16 15:52:37 EST 2011
From: boatanchors-bounces at puck.nether.net
[mailto:boatanchors-bounces at puck.nether.net] On Behalf Of doc at kd4e.com
> I have been challenged to consider if modern SSB receivers, and
> older AM receivers, can handle the signal produced by this circuit.
What? You mean I'm not the only one who does that to you? :-)
Of course they can. AM receivers just need a BFO to re-inject a "carrier"
locally and modern SSB receivers will only hear one sideband but one's all
> In theory it can be handled but may seem somewhat "odd".
The only thing odd about it is having a second sideband to play with. An
adequately tight passband on an AM Rx can reject one sideband with a little
finagling while a SSB Rx can simply switch sidebands if one is less QRM
troubled than the other. Of course, that means that the op on the other end
even knows you have two of them out there. :-)
> Someone else questioned if this modulation is permitted, or if
> any DSB is permitted.
Good grief! "Someone" needs to read part 97. Saying DSB isn't permitted is
like saying USB isn't permitted on 80 & 40, LSB isn't permitted on the upper
bands and WBFM isn't permitted on the upper part of 10m. "Isn't commonly
used" is not "isn't permitted." Big difference.
> As best I understand things DSB is AM with
> suppressed carrier just as SSB is AM with suppressed carrier and
> one sideband suppressed as well. (Oversimplified.)
Simplified but accurate and, to head off any folks who want to pick nits,
the key word is "simplified."
Michael, WH7HG BL01xh
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