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 > > > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri Feb 12 2016 - 00:18:40 UTC
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