Satellites

Amateur Radio FM Satellites

Active:

NORAD	Status	Mode(s)	Name	Downlink	Uplink	URL(s)	Details
27607	Active	voice	SO-50	436.795	145.850 (+67Hz)	HA N2YO	aka Saudisat 1C Oscar, use 145.850 +74.4 Hz to 'unlock' the repeater for 10 mins (if no activity)
43017	Active	voice	AO-91	145.960	435.250 (+67Hz)	HA N2YO	aka FOX-1B, RADFXSAT
43678	Active	CW/1k2/AFSK	PO-101	145.900	437.500	HA N2YO	aka DIWATA 2B, callsign D1W2PH
22825	Active	AFSK	AO-27	436.795	145.850	HA N2YO	aka Eyesat-1
40908	Active	AFSK/GFSK	Lilacsat-2	144.390	144.350	HA N2YO	beacon at 437.200

Inactive:

NORAD	Status	Mode(s)	Name	Downlink	Uplink	URL(s)	Details
51080	Reentered	voice,FSK	SO-115	436.888	145.925	HA N2YO	aka HADES, reentered
28375	Inactive	voice	AO-51	435	144	HA N2YO	aka AMSAT ECHO, transponder stopped in Nov 2011 due to battery failure
43137	Reentered	voice	AO-92	145.880	435.350 (+67Hz)	HA N2YO	aka FOX-1D, reentered
40967	Inactive	voice	AO-85	145.980	435.182	HA N2YO	aka FOX-1A, problem with uplink, 5 Watts often not enough

(Status was last checked on 2025-03-16 using information available from the various satellite organisations, this is not indicative whether you'll be able to make a successful connection to it)

Frequency offset

Add or subtract about 15kHz to compensate for the doppler effect

offset is more pronounced on higher frequencies, so with 70cm uplinks you need to be fairly precise with your frequencies. In these cases, a duplex radio (listen while you transmit) is desirable to confirm you can be heard.

Example frequencies for working SO-50

             RX downlink    TX uplink             Details
AOS                         145.850 +74.4Hz       Resets 10-minute timer
             436.805        145.850 +67.0Hz 
             436.800        145.850 +67.0Hz 
max alt      436.795        145.850 +67.0Hz   
             436.790        145.850 +67.0Hz    
LOS          436.785        145.850 +67.0Hz   

Example frequencies for working AO-91

             RX downlink    TX uplink               Details
AOS          145.960        435.240 +67.0Hz
             145.960        435.245 +67.0Hz 
max alt      145.960        435.250 +67.0Hz
             145.960        435.255 +67.0Hz
LOS          145.960        435.260 +67.0Hz