Satellite Links

LIVE – AMATEUR SATELLITES

HEAVENS-ABOVE

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ISS Tracker

ISS Primary Voice & Cross-Band Repeater Frequencies

Direct Crew Contacts & SSTV

Packet Radio (APRS)

Uplink (Transmit): 145.990 MHz (with a continuous tone-coded squelch system [CTCSS] or PL tone of 67.0 Hz)
Downlink (Receive): 437.800 MHz

These frequencies are used for scheduled school contacts, special events, and Slow-Scan Television (SSTV).

Worldwide Downlink: 145.800 MHz

Voice Uplink (The Americas & Pacific/Southern Asia): 144.490 MHz

Voice Uplink (Europe, Russia, & Africa): 145.200 MHz

Uplink & Downlink: 145.825 MHz

Active FM Satellites Frequencies

These satellites allow for standard two-way FM voice communication.

Satellite	Uplink (Transmit)	Downlink (Receive)	Notes
ISS (International Space Station)	145.990 MHz FM (Tone: 67.0 Hz)	437.800 MHz FM	Crossband repeater. APRS packet is also active on 145.825 MHz.
SO-50	145.850 MHz FM (Tone: 67.0 Hz)	436.795 MHz FM	Requires a 2-second carrier at 74.4 Hz to arm the 10-minute timer.
IO-86	145.880 MHz FM (Tone: 88.5 Hz)	435.880 MHz FM	Often active, but check schedules.

Linear / Transponder Satellites

Linear satellites allow multiple operators to communicate simultaneously using Single Sideband (SSB) or CW (Morse code).

Satellite	Uplink Frequencies	Downlink Frequencies	Notes
AO-7	145.920–145.975 MHz	29.400–29.450 MHz (10m)	Inverting transponder (Mode A).
AO-73	435.150–435.130 MHz (U/v)	145.950–145.970 MHz	Inverting linear transponder.
JO-97	435.100–435.120 MHz (U/v)	145.855–145.875 MHz	Inverting analog transponder.
RS-44	145.935–145.995 MHz (V/u)	435.610–435.670 MHz	Inverting analog transponder.

(Note: Doppler shift applies to all satellite communications, requiring you to constantly adjust your radio frequency as the satellite passes overhead)

Satellite Frequencies

Satellite	Number	Uplink	Downlink	Beacon	Mode	Callsign

AO-07	07530	145.850-950	29.400-500	29.502	A
AO-07	07530	436.125-175	145.975-925	145.972	B
AO-10	14129	435.030-180	145.975-825	145.810	CW, SSB
UO-11	14781		145.825	2401.500	1200bd PSK
RS-12	21089	21.210-250	29.410-450	29.408	CW, SSB
RS-13	21089	21.260-300	145.860-900	145.862	CW, SSB
UO-14	20437	145.975	435.070		FM
RS-15	23439	145.858-898	29.354-394	29.352	CW, SSB
AO-16	20439	145.900-960	437.025/051	2401.143	1200bd JAS	PACSAT-11, -12
DO-17	20440		145.825	2401.220	1200bd FSK
WO-18	20441		437.104/075		1200bd PSK
LO-19	20442	145.840-900	437.125/150	437.125	1200bd CW	LUSAT-11,-12
FO-20	20480	145.900-999	435.900-800	435.795	CW, SSB
RS-21	27394			145.825	CW
UO-22	21575	145.900/975	435.120	435.120	9600bd FSK	UOSAT5-11,-12
KO-23	22077	145.900/850	435.175	435.175	9600bd FSK	HL01-11,-12
KO-25	22828	145.980/870	436.500	436.500	9600bd FSK	HLO2-11,-12
IO-26	22826	145.875-950	435.822/867	435.822	1200bd JAS	ITMSAT-11,-12
AO-27	22825	145.850/870	436.795		FM
FO-29	24278	145.900-999	435.900-800	435.795	CW, SSB	8J1JCS
TO-31	25396	145.925/975	436.925/900	436.925	9600bd FSK	TMSAT1-11,-12
GO-32	25397			435.225	9600bd FSK	4XTECH-11,-12
SO-33	25509			437.910	9600bd FSK	SEDSAT-1
PO-34	25520	436.500	436.500		Spectrum
SO-35	25636
UO-36	25693	145.960	437.400/025	437.400	38400bd FSK	UO121-11, -12
AO-37	26065	145.960/980	435.700		9600bd FSK
OO-38	26063		437.100	437.100	9600bd FSK
WO-39	26061	145.860	437.070/175		9600bd FSK
AO-40	26609			2401.323	400bd PSK
SO-41	26545		436.775	436.775	9600bd FSK	SASAT1-11, -12
SO-42	26549		436.075	436.075	9600bd FSK	SASAT2-11, -12
SO-43	26929			145.820	9600bd FSK	STRSHN
NO-44	26931	145.825	145.825	145.825	1200bd FSK	(A) PCSAT-1
NO-44	26931	435.250	145.825	145.825	9600bd FSK	(A) PCSAT-2
NO-44	26931			144.390	1200bd FSK	(B) PCSAT-11
NO-44	26931			144.390	9600bd FSK	(B) PCSAT-12
NO-45	26932	145.945	437.100	437.100	1200bd FSK
MO-46	26548	145.850/925	437.325	437.325	38400bd FSK	MYSAT3-11, -12
BO-47	27422		145.840	145.840	400bd BPSK
BO-48	27422		435.270	435.270	400bd BPSK
ISS	25544	145.200	145.800		Voice (Reg 1)	NA1SS
ISS	25544	144.490	145.800		Voice (Reg 2,3)	NA1SS
ISS	25544	145.990	145.800		Packet	RS0ISS
SO-50	27607	145.850	436.800		J 67Hz CTCSS

NEW SATELLITES

Satellite	Number	Uplink	Downlink	Beacon	Mode	Callsign

AO-49		435.275	145.825		U-1200bd / D-9600bd	DP0AIS
ECHO	??	145.860 67Hz pl	435.225

INVERSE HETERODYNE OF FO-29, FO-20

Uplink	Downlink

145.900	435.900
145.901	435.899
145.902	435.898
:	:
145.950	435.850
:	:
145.998	435.802
145.999	435.801
146.000	435.800

i . e. Uplink + Downlink = 581.800

S-BAND SATELLITES

Satellite	Number	Uplink	Downlink	Beacon	Mode	Status

UO-11	14781		145.825	2401.500	1200bd PSK	Carrier
AO-16	20439	145.900-960	437.025/051	2401.143	1200bd JAS	Carrier
AO-40	26609	V,U,L,S,C	V,U,L,S,X	2401.323	400bd PSK	S-beacon

AO-40 FREQUENCIES

Uplink	Digital	Analog Passband

15m	none	21.210 - 21.250 MHz
12m	none	24.920 - 24.960 MHz
2m	145.800 - 145.840 MHz	145.840 - 145.990 MHz
70cm	435.300 - 435.550 MHz	435.550 - 435.800 MHz
23cm (1)	1269.000 - 1269.250 MHz	1269.250 - 1269.500 MHz
23cm (2)	1268.075 - 1268.325 MHz	1268.325 - 1268.575 MHz
13cm (1)	2400.100 - 2400.350 MHz	2400.350 - 2400.600 MHz
13cm (2)	2446.200 - 2446.450 MHz	2446.450 - 2446.700 MHz
6cm	5668.300 - 5668.550 MHz	566.550 - 5668.800 MHz

Downlink	Digital	Analog Passband

2m	145.955 - 145.990 MHz	145.805 - 145.955 MHz
70cm	435.900 - 436.200MHz	435.475 - 435.725 MHz
13cm (1)	2400.650 - 2400.950 MHz	2400.225 - 2400.475MHz
13cm (2)	2401.650 - 2401.950MHz	2401.225 - 2401.475MHz
3cm	10451.450 - 10451.750MHz	10451.025 - 10451.275MHz
1.5cm	24048.450 - 24048.750MHz	24048.025 - 24048.275MHz

TELEMETRY BEACONS (IHU)

	General Bracon (GB)	Middle Beacon (MB)	Engineering Beacon (EB)

2m	none	145.898MHz	none
70cm	435.438MHz	435.588MHz	435.838MHz
13cm (1)	2400.188MHz	2400.338MHz	2400.558MHz
13cm (2)	2401.173MHz	2401.323MHz	2401.573MHz
3cm	10450.975MHz	10451.125MHz	10451.375MHz
1.5cm	24047.885MHz	24048.035MHz	24048.285MHz

Modes of Operation

Satellite transponders are usually specified by a mode type i.e. Mode-A etc and a list of the differences, mostly frequency, follows.

Mode A	Uplink 2m, downlink 10m	Mode L	Uplink 23cm, downlink 70cm
Mode B	Uplink 70cm, downlink 2m	Mode S	Uplink 70cm, downlink 12cm
Mode J	Uplink 2m, downlink 70cm	Mode T	Uplink 15m, downlink 2m
Mode K	Uplink 15m, downlink 10m

But for P3-D, some time ago it was decided to use a two letter designator instead of the old single letter
transponder mode designators, simply because there are so many different combinations of receivers and
transmitters possible. Here are the band designators, the first letter stands for the uplink, the second letter
for the downlink. e.g. Mode-B would be called Mode UV; uplinks on both 435 MHz and 1.2 GHz linking
to 145 MHz and 10 GHz downlinks would be called Mode ULVX (but SHUT would still mean system
switched off). The letter assignments are consistent with the usual microwave band designations, where
"K" for example means 18-26.5 GHz.

Letter	Frequency	Remarks

T	21 MHz	Uplink only
H	24 MHz	Uplink only
V	145 MHz	Uplink and Downlink
U	435 MHz	Uplink and Downlink
L	1.2 GHz	Two Uplinks only, L1 and L2
S	2.4 GHz	2 Uplinks, 2 Downlinks, S1 and S2
C	5.6 GHz	Uplink only
X	10 GHz	Downlink only
K	24 GHz	Downlink only

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