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| To: | <[email protected]> |
|---|---|
| Subject: | RE: LF: Strange signal 500khz |
| From: | "Gary - G4WGT" <[email protected]> |
| Date: | Thu, 5 Oct 2006 11:52:44 +0100 |
| Delivered-to: | [email protected] |
| Importance: | Normal |
| In-reply-to: | <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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Hi
Markus,
Not so
:-) the TV was continuously on one channel for 2 programs whilst I
monitored, I watched 500KHz last night deliberately around the time my wife
switched the set on therefore proving it was my own TV. I believe that the
stepping effect is probably due to the "Freeview" digi-box because the TV
is an older analogue model & I would expect a steady (ish) interference
with no prominent stepping. I will do some tests with & without the
digi-box.
I do always
see a continuous weaker line near the same point which was also visible in my
previous attachment which is not due to the TV being in standby as we always
switch the set off by the mains on/off switch, the line could be generated by
one of my other electronic items which are always in stanby mode as they do
not have a mains power switch.
It seems that
Alan's comments about TV interference at that frequency were
correct.
73
Gary -
G4WGT.
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of [email protected] Sent: 05 October 2006 10:53 To: [email protected] Subject: Re: LF: Strange signal 500khz Gary,
interesting - one of your family members seems to be switching channels
rapidly ;-)
During my LORAN monitoring, I often saw a grid pattern which didn't average
out in 5 minutes or longer integration times. It appeared only on
certain chains, having group repetition intervals which were multiples
of 40 (i.e. 0.8 ms).
The explanation turned out to be a weak carrier at 93.750 kHz (6x line
scan) from my neighbour's TV. This became visible only when she was
watching either "ZDF" which used to have their line rate sysnchronized to
UTC, or "3sat" which showed a small variable slant due to
geostationary satellite residual Doppler.
73 de Markus, DF6NM |
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