Loggings > VHF/UHF Logs, including satellites and radiosondes

Frequency Hopping ( UHF SatCom?)

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Teotwaki:
I started performing a spectrum survey to get an idea of what UHF SatCom transponders are in view to the SE here and ran across 243.785 to 243.8450 with what looks like frequency hopping.

Rough heading of SE from my location in Orange County, Calif

Anyone have info or ideas?

1917z 6Dec2022

sat_dxer:
1917z 6 Dec /22
USA 227
Inclination: 4.6°
Mean Motion 1.00226/day (keplerian elements not updated since 21 Nov /20)

1917z 6 Dec /22
MUOS 1
Inclination: 3.1°
Mean Motion 1.00269/day

1917z 6 Dec /22
MUOS 5
Inclination: 5.2°
Mean Motion 1.00268/day
------------------------------------------------------------------
1917z 6 Dec /22
SKYNET 4F
Inclination: 10.8°
Mean Motion 0.99144/day

Teotwaki:
I may have to go back to the garage and pull out the AV-2011

Teotwaki:
Az-El is for my current location

USA 227    aka Quasar 13   Comsat / Relay, early warning
AZIMUTH:   152.7 SSE
ELEVATION    43.5

MUOS 1  - MUOS was originated as part of a WCDMA system. Was it repurposed to a frequency hopping system?
AZIMUTH:   151.2 SSE
ELEVATION:  44.8

MUOS 5   - MUOS was originated as part of a WCDMA system. Was it repurposed to a frequency hopping system?
AZIMUTH:   156.3 SSE
ELEVATION:  43.2

SKYNET 4F    4 SHF transponders (all), 2 UHF transponders (all), 2 C-band transponders (#D-F)
AZIMUTH:   125.5 SE
ELEVATION:  18.7

Teotwaki:
Based on  the document at this link
https://www.jhuapl.edu/Content/techdigest/pdf/V30-N02/30-02-Oetting.pdf

The page 107 illustration shows that MUOS cannot downlink at 243 MHz


So that leaves the possibility of USA 227 since Skynet 4F is further east and lower on the horizon.

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