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APRS Frequencies

Primary VHF Networks

North America: 144.39 MHz (Voice Alert 100.0 Hz CTCSS, mobiles only please!)
Europe: 144.800 MHz
Australia: 145.175 MHz (Voice Alert 91.5 Hz CTCSS)
New Zealand: 144.575 MHz
Argentina: 144.930 MHz
Japan: 144.640 MHz

Alternative Input VHF Networks

For low-powered trackers only:

Many areas: 144.99 MHz
Western Washington State: 144.35 MHz

UHF Networks

Australia (VK): 439.100 MHz 1200 baud (in selected areas)
Netherlands (PA): 430.5125 MHz 1200 baud
Puget Sound, WA: 440.875 MHz 1200/9600 baud
Kansas / Missouri: 446.175 MHz 1200 baud (primary, with infrastructure)
Kansas / Missouri: 441.175 MHz 1200 baud (secondary / special event, no infrastructure)
US Nationwide Proposed: 445.925 (proposed by Bob WB4APR)
New Zealand (ZL): 432.575 MHz 1200 baud allocated but little usage

HF Frequencies

Dial frequencies based on default tones used in popular packet devices.

    • 30 meters, 300 baud packet, Worldwide**
USB Dial Frequency Mark Frequency LSB Dial Frequency
KAM, MFJ, TinyTrak 10.147.600 MHz 10.149.200 MHz 10.151.000 MHz
AEA 10.147.100 MHz 10.149.200 MHz 10.151.500 MHz"


Satellite Uplink Frequency Downlink Frequency Alias Mode Status
ISS 145.990 MHz 145.800 MHz ARISS 1200 baud AFSK packet Active
PCSAT-2 145.825 MHz 435.275 MHz ARISS or WIDE2-2 1200 baud AFSK packet Active
PCSAT-1 (NO-44) 145.825 MHz 145.825 MHz ARISS 1200 baud AFSK packet Daylight Ops Only!
AO-51 (Echo) 145.860 MHz 435.150 MHz PACB-1 9600 baud FSK packet Active (see schedule)

AO-51 schedule

Satellites are subject to doppler shift and you should adjust your uplink/downlink accordingly. Doppler will make the frequency on a LEO shift as follows:

2 meters +/- 3kHz (FM capture effect negates the need to adjust on this band)

70 cm +/- 10kHz

13 cm + /- 50kHz

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