Re: [IRCA] Local 2nd and 3rd Harmonic

["Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx>]

> My recollection is that harmonics must be down 40 dB from the carrier.
> That's .1 Watt for WCTC. You didn't say how strong a signal you are
> receiving - if it's very strong it's surely more than .1 Watt and deserves
a
> mention. If it's a wispy DX level signal, they may be within legal limits
> and wouldn't appreciate a false alarm.
>
> If the 40 dB rule has changed since I last had to know these things, I'm
> sure one of our broadcast engineers will speak up right away.

The last time I had a spectrum test run at a client, I think the figure
was -73db.  It is measured about a kilometer away from the site.  If the
signal is -73db down from the fundamental, then it's good.  I might be wrong
on the figure, but I think it's more than 40db.

What I would do on that station is make sure that the harmonics are heard at
other locations.  Sometimes they are locally generated by things like
aluminum downspouts that have dirty of corroded junctions that form defacto
diodes.

Craig Healy
Providence, RI

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