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LF: Re: Carriers

To: [email protected]
Subject: LF: Re: Carriers
From: [email protected]
Date: Sat, 25 Aug 2001 07:06:32 EDT
Reply-to: [email protected]
Sender: <[email protected]>
Hi Mal and Alan,

I can strongly confirm such QRM from modern TV sets. That also seems to be
the reason why some days I "don't have ears" when operation from DF0WD.
On a spectrogram, you can see the 50- or 100-Hz-spaced lines drifting around
Also confirm the range of these nasty carriers: they can indeed exceed the
range of 100 yards (~meters). The clubstation DF0WD is about 150mtrs away
from the next house, but a part of QRM seems to correlate with the TV prime
time. On the waterfall its impressive to see a group of carriers disappearing
instantly after the main evening news at 20:15 local.

I guess most of the QRM travels over the mains supply lines. I already
considered building a battery-powered remove RX with a 70cm-FM-link to the
main station (using a cheap 70cm-LPD handy). The problem is finding a quiet
remote RX side where the RX cannot be vandalized or stolen.

As alternative, I am very curious about Steve's and Rob's noise canceller
experiments. IMO, cancelling more than one QRM source is a tough job.

Good luck to all,
 hope to c u  on 136kHz,
   Wolf  DL4YHF.

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