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ATEST(1) General Commands Manual ATEST(1)


atest - Decode AX.25 frames from an audio file.


atest [ options ] wav-file-in

wav-file-in is a WAV format audio file.


atest is a test application which decodes AX.25 frames from an audio recording. This provides an easy way to test Dire Wolf decoding performance much quicker than normal real-time.


Data rate in bits/sec. Standard values are 300, 1200, 2400, 4800, 9600.
300 bps defaults to AFSK tones of 1600 & 1800.

1200 bps uses AFSK tones of 1200 & 2200.

2400 bps uses QPSK based on V.26 standard.

4800 bps uses 8PSK based on V.27 standard.

9600 bps and up uses K9NG/G3RUH standard.

Force G3RUH modem regardless of data rate.

2400 bps QPSK compatible with Dire Wolf <= 1.5.

2400 bps QPSK compatible with MFJ-2400.

Divide audio sample rate by n.

Print frame contents as hexadecimal bytes.

Amount of effort to try fixing frames with an invalid CRC. 0 (default) = consider only correct frames. 1 = Try to fix only a single bit. more = Try modifying more bits to get a good CRC.

Error if Less than this number decoded.

Error if Greater than this number decoded.

Select the demodulator type such as D (default for 300 bps), E+ (default for 1200 bps), PQRS for 2400 bps, etc.


gen_packets -o test1.wav

atest test1.wav

gen_packets -B 300 -o test3.wav

atest -B 300 test3.wav

gen_packets -B 9600 -o test9.wav

atest -B 9600 test9.wav

This generates and decodes 3 test files with 1200, 300, and 9600 bits per second.

atest 02_Track_2.wav

atest -P E- 02_Track_2.wav

atest -F 1 02_Track_2.wav

atest -P E- -F 1 02_Track_2.wav

Try different combinations of options to compare decoding performance.


More detailed information is in the PDF files at

Applications in this package: aclients, atest, cm108, decode_aprs, direwolf, gen_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll