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FST4W is used in the same way as WSPR, but FST4W has significant
advantages for use on the 2200 m and 630 m bands. By default the
central *Rx Freq* is 1500 Hz and *F Tol* is 100 Hz, so the active
decoding range is 1400 to 1600 Hz. However, for added flexibility you
can select different center frequencies and *F Tol* values. A
drop-down control below *F Tol* offers a round-robin mode for
scheduling FST4W transmissions:
image::FST4W_RoundRobin.png[align="center"]
If three operators agree in advance to select the options *1/3*,
*2/3*, and *3/3*, for example, their FST4W transmissions will occur in
a fixed sequence with no two stations transmitting simultaneously.
Sequence 1 is the first sequence after 00:00 UTC. For WSPR-like
scheduling behavior, you should select *Random* with this control.
.Open a Wave File:
- Select *FST4W* on the *Mode* menu and *Deep* on the *Decode* menu.
- Set *T/R* to 1800 s.
- Set *NB* to 0%.
- Select appropriate wide graph settings. For example, try *Bins/Pixel* 1,
*Start* 1200 Hz and *N Avg* 150.
- Open a sample Wave file using *File | Open* and select the file
...\save\samples\FST4+FST4W\201230_0300.wav.
When it is finished you should see a single decode as shown in the
screenshot:
image::FST4W-1.png[align="left"]
Note that the weak signal associated with the single decode is
essentially invisible on the Wide Graph spectrogram.
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