RE: Possible KMS-4 Radio Reception on UHF

From: Ciprian Sufitchi via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 12 Feb 2016 01:17:34 -0500
I think you are right Scott. I monitored tonight the signals. Both
satellites were in the same part of the sky. The frequency and bandwidth
matched very well the ADCS service on 465.9875 MHz transmitted from Metop-A.

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: Thursday, February 11, 2016 2:26 AM
To: seesat-l_at_satobs.org
Subject: Re: Possible KMS-4 Radio Reception on UHF

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.w
> av
>
> 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 Fri Feb 12 2016 - 00:18:40 UTC

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