Don't touch it. If you do you become responsible, in your neighbor's eyes,
for any and all subsequent failures.
Regards.
Max. K 4 O DS.
----- Original Message -----
From: "ed breya" <e...@telight.com>
To: <time-nuts@febo.com>
Sent: Saturday, November 15, 2014 2:30 PM
Subject: Re: [time-nuts] strange carrier
A signal like that coming from a dish makes some sense to me. I vaguely
recall from about ten years ago investigating how the satellite receivers
work, that a fairly strong control signal of around 20 kHz was used in some
to select the various LNBs and their polarizations in more complicated
systems. This was passed via the cables superimposed on the DC power along
with the returning IF signals between the set-top box and the dish units.
If the neighbor's setup has a bad connection in a cable end, there could
be a pretty strong third harmonic of a 20 kHz-ish signal leaking out, with
a good-sized antenna possibly formed by maybe 50-100 feet of partly-opened
cable shield, depending on the possible ground loop paths. Another
possibility is if the LNB power line from the STB has lots of 20 kHz-ish
noise on it from a failure in the local SMPS.
If the possible faults were large, you would think it would be noticed as
a reception problem by the neighbor, but maybe a partial problem is enough
for you to see interference. If the interference is from the control
signal, it would likely be derived from a uP clock, so quite stable, while
if it's from SMPS switching, it should not be very stable, and also loaded
with line frequency sidebands.
If that is the case, maybe you could inform the neighbor so that they can
fix the problem (or you fix it for them), thus improving their reception
and reliability, and eliminating the interference.
I could be entirely wrong on this, but your last post rang a bell in my
head as soon as I saw "satellite dish."
Ed
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