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G0TEZ > TECH 08.04.06 01:24l 52 Lines 2112 Bytes #999 (0) @ WW
BID : 36344-GB7FCR
Read: DL1LCA GUEST
Subj: Re: Coded Orthogonal Freq Div Mux
Path: DB0FHN<DB0FOR<DB0MRW<DB0PV<DB0ZKA<DB0GPP<DB0OFI<DB0PRT<DB0LHR<DB0GE<
F6KFT<LX0PAC<ON0LGE<SR1BSZ<SP7MGD<7M3TJZ<ON0AR<GB7FCR
Sent: 060407/2315Z @:GB7FCR.#16.GBR.EU #:36344 [Blackpool] FBB-7.03a $:36344-GB
From: G0TEZ@GB7FCR.#16.GBR.EU
To : TECH@WW
Once again John,G8MNY has explained something I had wondered about. In
this case, CODFM. It was in 1996 that I was corresponding with a Dutch and
a German station about ATV and one of them mentioned camparisons between
various CTV systems e.g., PCM and FM which was popular at the time, CODFM
which I left unquestioned, thinking it would be explained in due course.
I didn't think it would be 10 years later,Hi!
In our area, at that time, we had three stations, a G4 a G6 and M1BZV who
were keen on FSTV. The G4 & G6 had put an off the shelf CCTV in a model
aeroplane and were using a madified sat Rx to receive it. Battery powered
and in the back of a van.
They lent me a tape of one of their trials. It was very good.Better, in
fact than the pics from in car cameras used in F1 at that time. Each time
they went under a bridge and on some sharp corners, the picture would
freeze or become pixelatedl. No guesses as to what they were using. I
don't know if it was compressed or not. It does seem to have improved
though,
The ATV was FM. The TX was built from a kit supplied by John's group, I
think.
Suddenly, both men disappeared, leaving the M1 with no one to send to. He
did try a higher AE and other frequencies but no one else in our area was
using FSTV. A few years earlier, I had heard hams in a nearby town, using
FSTV with CB for talkback. That was in the 80s and I don't know what
system was in use back then. I only heard them as I wasn't licenced at the
time and the CB was illegal, so I couldn't ask questions.
I never found out what happened to the G6 and G4. They vanished without
trace. We only have four stations slightly active in this area now, only
one is more than a 'black box' operator.
As for the D and the PA stations in 1996. I very much doubt if they are
around either. It is all a bit sad.
As for John's bull with the usual, excellent graphics, I have saved it to
a file and will probably print it to add to a book I keep.
Thanks again, mate.
All the best from - Ian, G0TEZ @ GB7FCR
Message timed: 17:37 GMT on 2006-Apr-07
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