[Scan-DC] Weather -- Blame it on me

[Andrew Clegg]

12 or so years ago, I had wondered the same thing. Could you downconvert 6 
MHz of the radio spectrum and play it into a VCR, then do the opposite in 
playback mode later on, and re-tune it? After all, isn't a VCR just 
recording the RF from a 6 MHz wide TV channel?

At a radio conference back then, I had an opportunity to talk to an MFJ 
engineer out in the hall, and I asked him this question, because it seems 
like it would have been a killer product. He looked at me like I was from 
another planet.

In the end, I decided maybe that it wouldn't work. Maybe a VCR actually does 
some detection first, then records the detected signal. When you play a 
tape, I supposed that maybe it took the detected signal and re-modulated it 
back onto RF.

But the article you talk about would seem to indicate that it would work. If 
you ever find the article, please post a link!

Andy


----- Original Message ----- 
From: <b_thom at juno.com>
To: <Scan-DC at mailman.qth.net>
Sent: Sunday, July 26, 2009 10:36 PM
Subject: Re: [Scan-DC] Weather -- Blame it on me


>
>
> On Sun, 26 Jul 2009 17:54:12 -0400 "Andrew Clegg" <w4jecom at w4je.com>
> writes:
>> Blame it on me.
>>
>> On Friday I bought a Perseus software-defined radio
>> (www.microtelecom.it/perseus),... You can
>> record up to
>> 1.6 MHz of radio spectrum to disk and play it back later with full
>> tuning
>> and demodulation capabilities.
>
> About twenty or twenty-five years ago, there was an article inMonitoring
> Times on how to use a VCR to record 5 or 6 MHz bandwidth at a time. They
> printed a circuit that showed it in use to record a whole bunch of the SW
> spectrum. Later, you could come back  and tune to whatever frequency you
> wanted to hear. I still have the article. It's  "somewhere."
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