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Add instructions for using FST4+FST4W sample files, including some screenshots.

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Steven Franke
2021-02-15 14:38:02 -06:00
parent 446c255eb5
commit 406cb314d7
6 changed files with 47 additions and 2 deletions
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doc/user_guide/en/tutorial-example6.adoc
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@@ -1,5 +1,5 @@
FST4W is used in the same way as WSPR, but FST4W has significant
advantages for use on the 2200 and 630 m bands. By default the
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. We expect
@@ -16,3 +16,27 @@ If three operators agree in advance to select the options *1/3*,
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. Set *T/R* to 1800 s and *Decode | Deep*.
- Select appropriate wide graph settings. For example, try *Bins/Pixel* 1,
*Start* 1200 Hz and *N Avg* 150.
- Enable the multi-threshold noise blanker by setting the noise blanker *NB* to -1.
This setting tells the decoder to try 0, 5, 10, 15, and 20 % blanking.
The *NB* setting is located just above the green receive power indicator and below the
frequency selection menu.
- Open a sample Wave file using *File | Open* and select the file
...\save\samples\FST4+FST4W\210203_0600.wav. Processing may take a minute or
more because of the noise blanker setting. When it is finished you should
see a single decode as shown in the screenshot:
image::FST4W-1.png[align="left"]
image::FST4W-2.png[align="left"]
The weak signal associated with the single decode is all but invisible on the
widegraph spectrogram. Note that the sample wave file will not decode if
the noise blanker is turned off
(*NB* set to 0 %) or if it is set to any positive number less than 14 %. Using
*NB* -1 tells WSJT-X to try noise blanker settings 0, 5, 10, 15, and 20 %. Similarly,
*NB* -2 tells WSJT-X to try noise blanker settings 0, 2, 4, 6, ..., 20 %.