---
name: "atest"
section: "1"
platform: "linux"
package: "direwolf"
version: "1.7+dfsg-2+deb13u1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/atest"
---

# atest(1)

Decode AX.25 frames from an audio file.

## NAME

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

## SYNOPSIS

**atest** \[ *options* \]  *wav-file-in*

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

## DESCRIPTION

**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.

## OPTIONS

- **-B** *n*

  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.

  AIS for ship Automatic Identification System.

  EAS for Emergency Alert System (EAS) Specific Area Message Encoding (SAME).

- **-g**

  Force G3RUH modem regardless of data rate.

- **-j**

  2400 bps QPSK compatible with Dire Wolf \<= 1.5.

- **-J**

  2400 bps QPSK compatible with MFJ-2400.

- **-D** *n*

  Divide audio sample rate by n.

- **-h**

  Print frame contents as hexadecimal bytes.

- **-F** *n*

  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.

- **-L**

  Error if Less than this number decoded.

- **-G**

  Error if Greater than this number decoded.

- **-P** *m*

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

## EXAMPLES

**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.

## SEE ALSO

More detailed information is in the PDF files at https://github.com/wb2osz/direwolf/tree/master/doc/.

Applications in this package: aclients, atest, cm108, decode\_aprs, direwolf, gen\_packets, kissutil, ll2utm, log2gpx, text2tt, tt2text, utm2ll