RE: Possible KMS-4 Radio Reception on UHF

From: Ciprian Sufitchi via Seesat-l <>
Date: Thu, 11 Feb 2016 00:54:08 -0500
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:
I will try again tomorrow.

Chip N2YO

-----Original Message-----
From: Seesat-l [] On
Behalf Of Ciprian Sufitchi via Seesat-l
Sent: Tuesday, February 09, 2016 11:26 PM
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.

Chip N2YO

-----Original Message-----
From: Seesat-l [] On
Behalf Of Scott Tilley via Seesat-l
Sent: Tuesday, February 09, 2016 11:13 PM
To: SeeSat <>
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.

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.

Scott Tilley

8049 ST 49.4348 -123.6685 40. Scott Tilley ROBERTS CREEK 2:
8048 ST 49.4175 -123.6420 1. Scott Tilley

Seesat-l mailing list

Seesat-l mailing list

Seesat-l mailing list
Received on Wed Feb 10 2016 - 23:56:00 UTC

This archive was generated by hypermail 2.3.0 : Thu Feb 11 2016 - 05:56:00 UTC