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PA2RHB > TECH 04.03.03 21:33l 45 Lines 1543 Bytes #999 (0) @ WW
BID : FA0213PA2RHB
Read: DB0FHN GUEST OE7FMI
Subj: Re: "Explorers", how do they work?
Path: DB0FHN<DB0ZWI<DB0HDF<DB0ERF<DB0FBB<DB0GOS<ON0AR<ON0AR<PI8WFL
Sent: 030304/2028Z @:PI8WFL.#NH1.NLD.EU #:9573 [Enkhuizen] $:FA0213PA2RHB
From: PA2RHB@PI8WFL.#NH1.NLD.EU
To : TECH@WW
Hello everyone,
on the subject of "Explorers", I had a few responses, of which the
following two summon up the gist of them fairly completely:
> I don't have heard about this equippment before, but I immediatly
> thought, that it could be a frequencycounter, that measures the
> frequency, and with that data sets the RX.
> That can be done cheap and fast.
>
> vy 73, de Evert, pe1auk @ pi8awt
> That [the above] was my first thought, but then it would not explain how
> they can be set to skip a channel which is in use and move on
> to the next. I go with the rapidly tunable VCO idea.
>
> 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU
Certainly, some products plainly advertise themselves as being a counter
used to program a receiver.
Some others, and these are the more interesting I think, are probably
something other than counters.
Imagine you're watching a "flock" of cyclists go by, and you're able to
listen in on the headman talking to the rest, even when you have the
reporters' van right behind you - so you are "under the smoke" of the 210
MHz link to the studio all the time.
A counter would not be able to count anything else, because the link
transmitter is on all the time.
So this is "the other kind" of snooping receiver.
Meanwhile, I'll sweep an old TV tuner over the band, stopping on the first
sign of DC on the video detector output, than kicking the VCO ramp on
towards the next blip if the first wasn't interesting enough ;-)
Cheers 'n beers
Rudolf pa2rhb
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