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55 lines
2.2 KiB
Plaintext
55 lines
2.2 KiB
Plaintext
image::settings-advanced.png[align="center",alt="Settings Advanced"]
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_JT65 VHF/UHF/Microwave decoding parameters_
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- *Random erasure patterns* logarithmically scales the number of
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pseudo-random trials used by the Franke-Taylor JT65 decoder. Larger
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numbers give slightly better sensitivity but take longer. For most
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purposes a good setting is 6 or 7.
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- *Aggressive decoding level* sets the threshold for acceptable
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decodes using Deep Search. Higher numbers will display results
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with lower confidence levels.
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- Check *Two-pass decoding* to enable a second decoding pass after
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signals producing first-pass decodes have been subtracted from the
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received data stream.
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_Miscellaneous_
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- Set a positive number in *Degrade S/N of .wav file* to add known
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amounts of pseudo-random noise to data read from a .wav file. To
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ensure that the resulting S/N degradation is close to the requested
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number of dB, set *Receiver bandwidth* to your best estimate of the
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receiver's effective noise bandwidth.
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- Set *Tx delay* to a number larger than the default 0.2 s to create
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a larger delay between execution of a command to enable PTT and onset
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of Tx audio.
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+
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IMPORTANT: For the health of your T/R relays and external
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preamplifier, we strongly recommend using a hardware sequencer and
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testing to make sure that sequencing is correct.
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- Check *x 2 Tone spacing* or *x 4 Tone spacing* to generate Tx audio
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with twice or four times the normal tone spacing. This feature is
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intended for use with specialized LF/MF transmitters that divide
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generated frequencies by 2 or 4 as part of the transmission process.
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_Special Operating Activity: Generation of FT4, FT8, and MSK144
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messages_
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- Check this box and select the type of activity to enable
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auto-generation of special message formats for contesting and
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DXpeditions. For *ARRL Field Day*, enter your operating Class and
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ARRL/RAC section; for *ARRL RTTY Roundup*, enter your state or province.
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Use “DX” for section or state if you are not in the US or Canada. In
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the RTTY Roundup, Stations in Alaska and Hawaii should enter “DX”.
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- Check *Fox* if you are a DXpedition station operating in FT8
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DXpedition Mode. Check *Hound* if you wish to make QSOs with such a
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Fox. Be sure to read the operating instructions for {ft8_DXped}.
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