General Information
TWINPLEX is a 2 channel frequency domain multiplex ARQ system for data communications.
Usage:
§ Transfer of textual information over HF.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
4 |
|
|
Symbol rate (Bd) |
50 |
|
|
Error correction |
ARQ |
|
|
Alphabet |
ITA-3 |
|
Demodulator Settings |
Demodulator |
F6/F7B |
|
|
F7B mode |
Data (interleaved) |
|
|
Symbol rate (Bd) |
100 |
|
|
SR tolerance (Bd) |
5 |
|
|
Distance F1 <-> F2 (Hz) |
115 |
|
|
Distance F2 <-> F3 (Hz) |
170 |
|
|
Distance F3 <-> F4 (Hz) |
515 |
|
|
Shift tolerance (Hz) |
20 |
|
|
Min. burst length (s) |
0.180 |
|
|
Max. burst length (s) |
0.250 |
|
|
Min. pause length (s) |
0.100 |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
Table 210: TWINPLEX
Figure 72: TWINPLEX Spectrogram