Re: Simple spectrum analyzer for pre-compliance

Jeff Liebermann wrote:

Rich Grise <rich@xxxxxxxxxxx> hath wroth:


If you have two, you can sync one to the vertical and the other to
the horizontal, the video to the vertical of each, and see a top
view on one and a side view on the other. Then, just mentallly interpolate to derive the picture. ;-)


Kinda reminds me of the rotating color disk TV standard proposed by
CBS in about 1947. It works, but who would want to use it?


Would have created a whole new profit center in industry, the TV lube and tune.


I have a pretty kewl scope with Z axis - all I'd need to watch TV
in my office/lab is some kind of vertical sweep (I'd use the horizontal
for horizontal ;-) ), a TV tuner, and a video amp. I might as well
go to the pawn shop and get a 5" portable for $10. ;-)


It's not quite that easy. There are plenty of articles on the
internet for converting a television into a really awful oscilloscope,
but not the other way. I first did it in college (late 1960's) using
and RTL, DTL, and DCL sync seperator. It was all part of Learn By
Destroying(tm).

I found very few articles on the topic with Google. Looks it would
make a good student project.
<http://www.electronixandmore.com/project/14.html>
<http://www.earlytelevision.org/neitz.html>
<http://www.intio.or.jp/jf10zl/tv.htm>


It was done a lot in ham radio. Many folks will remember slow scan television. If you were remotely related to the Rockefellers you'd obtain a surplus scope with a slow decay tube. If you weren't, then you got said tube at a flea market and built a crude scope. Around that the sweep generator and sync was built, plus the signal path filtering and demodulator.

The high voltage generation was a bit of a challenge with 1970's parts. Many a fine circuit came to grief in them days. The worst case was a guy who managed to zap a HV jolt onto the +5V rail in his VME-style Eurocard rack which contained all kinds of other circuits as well. It toasted literally every single IC in there. The only thing that was still working was the little lamp inside the power switch.

--
Regards, Joerg

http://www.analogconsultants.com
.

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