[amsat-bb] Russian Thing

[Mac A. Cody]

If one were familiar with the modulation pattern of HDTV, couldn'tone
use an SDRplay, or something similar, and a panadapter to look for the
signature?  It wouldn't be necessary to demodulate the signal in order
to determine whether the signal was being reflected.  The old technique
isn't necessarily dead, but the tools used to apply it have to change.

73,

Mac Cody / AE5PH

On 07/19/2017 07:26 AM, Robert Bruninga wrote:
> 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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