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G0SYR > ECHOS 27.10.05 17:14l 43 Lines 1878 Bytes #999 (0) @ WW
BID : 46313G0SYR
Read: DK5RAS DK3TB DO1EH DF1ND GUEST DJ1EI
Subj: Re: Long Delay Echos.
Path: DB0FHN<DB0THA<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<DB0RES<DK0WUE<I0TVL<CX2SA<
GB7YFS<GB7CIP<GB7CIP<GB7CIP
Sent: 051027/1324Z @:GB7CIP.#32.GBR.EU $:46313G0SYR
T:From: g0syr <g0syr@gb7cip.ampr.org>
T:Newsgroups: ampr.prop.longdelayecho
T:Message-Id: <klnpb8ug8ty0$.14ju7u1rsjqpp$.dlg@40tude.net>
Hi All,
Certainly as Pete G6KUI says recording/playback could
be one source of LDE.
A local amateur, G3GKF, who has since passed on once
told me a story of a visit by the Radio Authority
investigating a TVI complaint. He was given a walky
talky while the RA man went to the house with the problem
and was asked to put out a call on SSB on 80 metres.
After a while he was asked to stop and while sitting
listening on the frequency he was surprised to hear
his own voice calling CQ test again.
At first he believed it was someone being funny but soon
the penny dropped when he realised the problem was with
him breaking through on a domestic video recorder.
When the tape was played back he was hearing a simple
recording of his own 80 metre signal recorded onto the
tape then amplified enough to drive the TV tube so that
is was strong enough for him to be able to receive his
own re-radiated recorded signal.
Though this is not strictly HF bands and it's less likely
perhaps that a 20 metre signal could be heard this way
as it's well outside the recording passband there may
be other instances of equipment that could record HF
signals in this way and allow them to be heard locally.
It would certainly seem possible that a top band or 80
metre transmission could be preserved in this way even
on a DVD recording of today so if you hear that long gone
gone callsign eerily calling CQ topband it could just be
his neighbours watching that old copy of the 'Sound of Music'
with those annoying bursts of interference rather than
any voice from beyond the grave :-)
-
73 de Bryan g0syr.ampr.org [ 44.131.244.60 ]
Amprnet mail g0syr@gb7cip.ampr.org
AX25 mail G0SYR@GB7CIP.#32.GBR.EU
Internet Mail g0syr@beeb.net
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