Re: Possible KMS-4 Radio Reception on UHF

From: Scott Tilley via Seesat-l <seesat-l_at_satobs.org>
Date: Wed, 10 Feb 2016 23:25:46 -0800
Hi Chip

Thank-you for your report.

Metop-A remains in close proximity to KMS-4 based on Spacetrack TLEs and 
runs late of KMS-4.  I noted Metop-A downlink during my attempts to copy 
KMS-4 this evening.  I scanned the band between 460-475MHz and 480MHz 
+/- 2MHz (Chinese metro band) this evening on predicted paths and only 
Metop-A was noted.  Nothing with Doppler noted otherwise in these 
ranges.  I have abandoned S-band scans as the hardware is needed elsewhere.

I ask a simple question:

"Kim jong-un, has North Korea not heard of duct tape?  Next time, tape a 
UHF transmitter to your ballast load to give your effort some 
credibility. Surely a country that can launch a rocket into orbit can 
wrap their heads around a simple radio beacon..."

:-)

s

On 2/10/2016 9:54 PM, Ciprian Sufitchi via Seesat-l wrote:
> Tonight around 20:30 local I monitored the band around the frequency
> suggested by Scott. My UHF antenna has a 15.5 dBic gain and is circular
> polarized. It is Az/El positioned by a G-5500 Yaesu rotator. Receiver was
> RTL-SDR dongle with SDR#.
> As the object climbed in the sky, I discovered a fairly strong signal which
> responded quite well to antenna orientation. The signal was showing Doppler
> effect, as expected. It was a carrier with two weaker symmetrical side
> signals, indicating apparently narrow band amplitude modulation. The AM and
> FM demodulators with SDR# did not show any effective information modulated.
> The signal faded fairly quick in strength to disappear completely before the
> satellite reached the max altitude. Other searches to find that signal
> during the same pass failed. I started recording too late, but I have a
> sample of about 2 minutes in my file. Unfortunately the file is really huge,
> about 2GB because I had probably a too much bandwidth. I recorded my SDR#
> window with sound on USB mode (3 kHz bandwidth) so that the drift in
> frequency can be heard. It is on youtube:
> https://www.youtube.com/watch?v=SHv0xwVypCY
> I will try again tomorrow.
>
> Chip N2YO
>
> -----Original Message-----
> From: Seesat-l [mailto:seesat-l-bounces+ciprian=sufitchi.com_at_satobs.org] On
> Behalf Of Ciprian Sufitchi via Seesat-l
> Sent: Tuesday, February 09, 2016 11:26 PM
> To: seesat-l_at_satobs.org
> Subject: RE: Possible KMS-4 Radio Reception on UHF
>
> Hi Scott,
>
> I listened to entire wav file but I could't hear any modulated carrier, can
> you please check the file you uploaded? I will try to track KMS-4 with my
> UHF antenna around that frequency, but the most effective pass will be only
> tomorrow around 20:30 EST for my location for a 60 degrees max elevation. I
> will report my results, if any.
>
> Thanks,
> Chip N2YO
>
> -----Original Message-----
> From: Seesat-l [mailto:seesat-l-bounces+ciprian=sufitchi.com_at_satobs.org] On
> Behalf Of Scott Tilley via Seesat-l
> Sent: Tuesday, February 09, 2016 11:13 PM
> To: SeeSat <seesat-l_at_satobs.org>
> Subject: Possible KMS-4 Radio Reception on UHF
>
> 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 Thu Feb 11 2016 - 01:26:36 UTC

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