Re: Possible KMS-4 Radio Reception on UHF

From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 09 Feb 2016 20:39:46 -0800
Hi All

Ted asked why he couldn't hear anything on the .wav file.

The .wav posted was recorded with Spectravue and is 190KHz in 
bandwidth.  If you play it using Spectravue you will have an easier time 
hearing something meaningful.  Other common players will produce very 
low output etc as you are not focused on the slice that matters.

For the analysis you have a 190KHz BW of raw audio data to perform 
Doppler analysis with, nudge nudge wink wink...!  When you run the 
playback with Spectravue the signal in question becomes obvious.

Spectravue can be found here:
http://www.rfspace.com/RFSPACE/SpectraVue.html

I have no relationship with rfspace other then I own one of their SDR-IQs.

Here's a screen shot of the first few seconds with obvious Doppler 
behaviour:
https://dl.dropboxusercontent.com/u/15916951/KMS_4_possible.png

s


On 2/9/2016 8:13 PM, Scott Tilley via Seesat-l wrote:
> Hi All
>
> I have been searching for LMS-4 for a number of days on UHF and S-Band 
> as sun angles are not good here...
>
> Tonight I copied a weak Doppler affected signal centered on or about 
> 465.97MHz that matched the timings of the KMS-4's pass over me.  I was 
> not running my system for detailed Doppler analysis as I was in a 
> search mode when I came across the signal.  It's definitely a 
> modulated carrier with Doppler.  See the attached .WAV file.
>
> I spoke with Ted and he asked me to post this finding to the list even 
> thou it is not a visual observation as the details of any observation 
> are of high interest to all observers.
>
> https://dl.dropboxusercontent.com/u/15916951/Record0_20160210_034006.wav
>
> Observations were made from Cospar 8049 with an omnidirectional 
> discone antenna connected to an AR8600 with Spectravue software and an 
> SDR-IQ.
>
> I welcome any requests for clarification.
>
> Regards,
> Scott Tilley
>
> ROBERTS CREEK 1:
> 8049 ST 49.4348 -123.6685 40. Scott Tilley
> ROBERTS CREEK 2:
> 8048 ST 49.4175 -123.6420 1. Scott Tilley
>
>
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Received on Tue Feb 09 2016 - 22:40:22 UTC

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