[amsat-bb] Russian Thing

[Robert Bruninga]

Easy to test.  Just pick a UHF TV station that is hudreds of miles ffrom
you and wait for the ISS to fly through the path between you.

BUT!  I don't have a clue how you can see the effect with Digital TV???
With analog, the flutter was instantaneous and a direct correspondence to
signal strength even if only milliseconds came through.  On digital TV,
you don't get nuttin until you have had SOLID seconds of unflutter digital
signal.

So I guess that old technique is simply dead.

Maybe do it with FM radio?  They have a multi thousand watt transmitter
aimed at their horizon.  Just choose a station that is 500 miles away...

Better yet, simply tune to a totally clear FM channel in your rural area
(if there is one) and wait.  If the ISS flies through the path of any
station anywhere on that channel, you should hear something?

Bob

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Ross
Whenmouth
Sent: Wednesday, July 19, 2017 2:02 AM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Russian Thing

> Date: Tue, 18 Jul 2017 11:16:38 -0500
> From: Joe<nss at mwt.net>
>
> Now for a surface to be reflective, how big does it need to be in
> terms of wvelength?

That's textbook radar theory - see:
http://slideplayer.com/slide/3927976/13/images/9/Modelling+development+&+r
esults.jpg

Provided that you have enough EIRP (EME rig?), I would expect that 6m or
2m would probably be a good choice of band, since shorter wavelengths are
more likely to undergo optical scattering, which might not be in the
direction of your intended RX.

On this subject, have any hams tried using the ISS as a passive RF
reflector?


73 ZL2WRW
Ross Whenmouth
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