Cross Country Wireless logo

Cross Country Wireless APRS Messenger program

CCW APRS Messenger screenshot

The APRS Messenger program provides a simple way to send and receive APRS messages over PSK, MFSK and GMSK modes on HF.

Features include:

APRS Messenger version 3.54 can be downloaded as a freeware 1.3 MB zip file here .

The latest version v3.54 has a bug fix to the GPS beacon routine.

Version v3.53 fixes several bugs reported by users. Unused functions such as the Raynet spreadsheet, remote igate control, and the Data 1,2 and 3 boxes have been removed. A click box to remove the receiver notches has been added for users with variable receiver filtering. The Internet to HF feature now transmits in MFSK-16.

Version 3.52 has many updates and new features:
MFSK-4 and MFSK-16 modes have been optimised for weak signal use.
Multiple notch filters are used to create a bandpass filter for users with fixed SSB bandwidth radios.
Receiver view window to observe data from all 24 software receivers
AX.25 mode now keys the PTT port so that UZ7HO soundmodem (or a hardware KISS TNC) can use the same transmitter for AX.25 as APRS over datamodes.
All settings on both windows are now saved on program close down. Just change the setting in either window, close the program and restart to begin use.
Halt TX button now added to cancel transmit instantly.
"Stop the clock..." click box now added on the start up window to stop the 60 second automatic start timer.
GPS and TNC port in use indicators added on start-up window.
GPS 9600 bd click button (4800 bd unclicked default).
The Raynet.xls spreadsheet feature has been disabled.
MFSK-4 beaconing is restricted to a minimum of 10 minutes.
Many bug fixes.

Version 3.52 is the result of a recent development program to update the program. Many thanks for the hard work, help and assistance of the beta testers, Julian, John, Kenneth and Mark.

A useful web page describing the set-up and theory behind APRS Messenger is available here.

A text document describing the HF APRS over digimodes format in APRS Messenger is available here.

The frequencies used for APRS over PSK, MFSK16 and GMSK are 10.1497 MHz worldwide and 7.0473 MHz in Australia. A frequency of 14.1017 MHz is also used for Net14 APRS over digimodes. Radio frequency settings for digital modes on a SSB transceiver is dial frequency + tone frequency USB or dial frequency - tone frequency LSB. For example a radio dial frequency of 10.1476 Mhz on USB plus a tone frequency of 2.1 kHz gives 10.1497 MHz. For the 40m frequency used in Australia a dial frequency of 7.0452 MHz on USB plus a tone frequency of 2.1 kHz gives 7.0473 MHz. Igates in Europe, US and Australia are already in operation. Please use an SSID of -63 for APRS over PSK, MFSK and GMSK operation. The original program only had PSK-63 hence the choice of -63.

The program will work with serial TNC's that accept the conv and Ctl-C commands for converse operation.

Contact Chris Moulding, G4HYG via

APRS is a registered trademark of Bob Bruninga WB4APR. Click here to view Bob's website.

APRS is an international network of amateur radio stations providing real-time GPS based vehicle or event position reporting, weather reporting and simple message handling for educational, experimental or emergency use. APRS uses a common VHF radio frequency of 144.800 MHz throughout Europe, 144.390 MHz in the USA. Digital repeating (digipeating) is used to extend the range of mobile and low power stations over a wider area. In addition to the radio network internet gateways provide a two-way port to the APRS-IS (APRS Internet System) so that stations local to the gateway can be seen worldwide on APRS viewing programs such as Xastir or UI-View.

APRS over PSK, GMSK and MFSK was originally developed in 2011 to allow mobile or fixed station APRS operation on HF from remote areas away from the coverage of the VHF APRS network or the internet. Using 10.1497 MHz as a common frequency in Europe and the USA a typical range of 400 to 2000 miles from fixed and mobile stations using modest equipment can be expected. There are several Igates operating in Europe, the USA and Australia transferring received packets and messages from 10.1497 MHz worldwide and 7.0473 MHz in Australia to the APRS-IS. Recent developments have added the MFSK-4 mode to allow a second slow speed traffic channel for stations using low power from battery or solar powered remote stations. This is transmitted on a separate frequency 210 Hz higher than the main channel.

Back to Index

Valid HTML 4.0 Transitional

Valid CSS!