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HF Modem Tones

Popular Modem Offsets

The table below lists the common HF modem/TNC equipment in use, and thier tones.
These have been are categorised into "Groups" for the purpose of carrier frequency selection

Modem / TNC
Tone Frequencies
Group "A"
Bell 103 Originate
1070
1270
Group "B"
Tigertronics TM1
1100
1300
Group "C"
MFJ-1270 & MFJ-1270b
1600
1800
TinyTrack 3 & 4
1600
1800
Kam Plus
1600
1800
PacComm TNC320 1600 1800
OpenTracker 1600 1800
Group "D"
Bell 103 Answer
2025
2225
Group "E"
AGWPE (Soundcard)
2100
2300
MixW (Soundcard)
2100
2300
Group "F"
PK-232
2110
2310
MFJ-1270c & MFJ-1274c
2125
2295
MFJ-1276 & MFJ-1278
2125
2295
Group "G"
DSP-12
2125
2325
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