Analog Satellites

Satellites with analog transponders are listed below. The Mode is an AMSAT convention used to describe the frequency band combination of the transponder's uplink and downlink. For instance, Mode A is a 2 meter uplink and a 10 meter downlink. Most analog satellites have linear transponders. Linear transponders cover a continuous passband of frequencies for the uplink and downlink. Inverting transponders will invert both the sideband and track frequency in opposing directions (an increase in uplink frequency results in a corresponding decrease in downlink frequency). Since Continuous Wave (CW) is just a carrier, there is no sideband to invert, but frequency does track in the opposite direction. Non-inverting transponders maintain the same sideband for uplink and downlink and track frequency in the same direction.

Satellite ID

Mode

Uplink Freq. MHz

Uplink Mode

Downlink Freq. MHz

Downlink Mode

Trans- ponder

AO-10

B

-

-

145.810, 145.897

USB / CW

Beacons

AO-10

B

435.030 - 435.180

LSB / CW

145.975 - 145.825

USB / CW

Inverting, Linear

AO-27

J

145.850

FM

436.792

FM

Part-time Repeater

FO-20

JA

-

-

435.795

USB / CW

Beacon

FO-20

JA

145.900 - 146.000

LSB / CW

435.800 - 435.900

USB / CW

Inverting, Linear

FO-29

JA

-

-

435.795

USB / CW

Beacon

FO-29

JA

145.900 - 146.000

LSB / CW

435.800 - 435.900

USB / CW

Inverting, Linear

RS-12

KA

-

-

29.4081, 29.4543

USB / CW

Beacons

RS-12

A

145.910 - 145.950

USB / CW

29.410 - 29.450

USB / CW

Non- inverting, Linear

RS-12

K

21.210 - 21.250

USB / CW

29.410 - 29.450

USB / CW

Non- inverting, Linear

RS-13

KA

-

-

29.504

USB/CW

Beacon

RS-13

A

145.960 - 146.000

USB/C W

29.460 - 29.500

USB/CW

Non- Inverting, Linear

RS-13

K

21.260 - 21.300

USB/C W

29.460 - 29.500

USB/CW

Non- Inverting, Linear

RS-15

A

-

-

29.352

USB / CW

Beacon

RS-15

A

145.858 - 145.898

USB / CW

29.354 - 29.394

USB / CW

Non- inverting, Linear

SO-35

J

145.825

FM

436.250

FM

Repeater

UO-14

J

145.975

FM

435.070

FM

Repeater

The convention for using an inverting transponder is to transmit on Lower Sideband (LSB) and receive on Upper Sideband (USB); for non-inverting transponders, use USB for both the uplink and the downlink.

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Analog satellites let you make contacts by voice or Morse code

The satellites usually have an analog transponder with a range of frequencies (passband)

The uplink passband may be aligned directly with the downlink passband or in some cases the alignment is inverted