---
name: "fsk_mod"
section: "1"
platform: "linux"
package: "codec2"
version: "1.2.0-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/fsk_mod"
---

# fsk\_mod(1)

a diagnostic tool for the codec2 library to create a raw horus modem signal file from a codec2 bit file.

## NAME

fsk\_mod - a diagnostic tool for the codec2 library to create a raw horus modem signal file from a codec2 bit file.

## SYNOPSIS

**fsk\_mod usage:** *Mode* *SampleFreq* *SymbolFreq* *TxFreq1* *TxFreqSpace* *InputOneBitPerCharFile* *OutputModRawFile*

## DESCRIPTION

Reads in a set of bits to modulate from a file, passed as a parameter, and writes modulated output to another file

## OPTIONS

The first argument,  *Mode* is an integer. 2 for 2FSK modem, 4 for 4FSK modem.

The second argument,  *SampleFreq* is an integer specifying the sample rate.

The third argument,  *SymbolFreq* is an integer.

The fourth argument,  *TxFreq1* is an integer.

The fifth argument,  *TxFreqSpace* is an integer.

The sixth argument, *InputOneBitPerCharFile* is the file name of a file with codec2 encoded bits. If "-" is given the input is taken from stdin.

The seventh argument,  *OutputModRawFile* is the file name of a file to be created with modem sample data. If "-" is given the output is sent to stdout.

## SEE ALSO

[**fm\_demod**(1)](/fm_demod/1.md), [**fdmdv\_mod**(1)](/fdmdv_mod/1.md), [**fdmdv\_demod**(1)](/fdmdv_demod/1.md), [**fdmdv\_get\_test\_bits**(1)](/fdmdv_get_test_bits/1.md) [**fdmdv\_put\_test\_bits**(1)](/fdmdv_put_test_bits/1.md)