|Subject:||LF: Re: Carriers|
|Date:||Sat, 25 Aug 2001 07:06:32 EDT|
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,
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