Re: [IRCA] Synching-up

["Dan Strassberg" <dan.strassberg@xxxxxxx>]

Nick Hall-Patch questioned the likelihood that stations in other
Western-Hemisphere nations would be willing to participate in the
"synching-up" scheme.
-----
Thanks for the response, Nick: Until I started getting replies to my
question, I had no idea about the connection between HD Radio and GPS. I
also had no thought of getting Cubans. Mexicans, or other Western
Hemishphere nations to buy into the scheme. I thought of it simply as a way
of minimizing the SAH between (primarily) US Class Bs on Class A channels
(and not all of them) and the dominant co-channel US Class As (though I
guess that if the scheme had any merit, it might also be usable by US Class
Ds operating on Canadian Class A channels). Based on one of the responses
I've received, although frequency locking would be possible, the bandwidth
of the satellite signals would be inadequate for phase locking. If that's
so, it would be impossible to position the dead spots (where the signals
would cancel) and keep them from "walking" around the listening area. Also,
since the location of the dead spots would depend on the (quite variable)
height of the reflective layer of the ionoshere, it would be impractical to
attempt to position the dead spots.

I guess I can't call synching-up a non-starter, because it started 3/4 of a
century ago, but it looks as if the satellite-based version is a
non-starter. Still, I wouldn't know that if I hadn't asked. So thanks to all
who responded.

--
Dan Strassberg, dan.strassberg@xxxxxxx
eFax 707-215-6367






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