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 _______________________________________________ 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 Wed Feb 10 2016 - 23:56:00 UTC
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