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You can select from various Shifts, Bauds, Bits, Parity and Stop Bits
for both AFSK and FSK keying of the transmitter. You can elect to
have fldigi automatically insert a CFLF when it reaches character 72 on
a line. You can also have it insert a CR-CR-LF sequence instead
of the standard CR-LF sequence. This is very useful if you are
communicating with someone using a hardware TTY printer. The
extra carriage return will give the physical device time to move to the
left margin before new characters arrive. If your rig is set to USB and receiving RTTY signals then check the RTTY is USB box. If you are on LSB then leave the box unchecked. The rtty decoder maintains an internal AFC system for tracking the desired signal. Depending on operating conditions you may need to adjust the action of the AFC loop. Select from the Slow, Normal or Fast AFC loop. You can also disable AFC with the AFC button on the main panel. The Digiscope display can be defaulted to the X-hair scope or the Signal scope. Anytime you change the parameters you need to "Restart" the modem. This will not cause loss of waterfall data, merely reset the internal workings of the RTTY modem. PseudoFSK selection generates an additional audio signal on the right channel. This signal is a burst tone at the FSK keying rate. You can full wave rectify and filter the signal so that it can be used as the FSK keyline signal to a rig that supports FSK transmissions. |
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A few more words about the "Sweet Spot". Most transceivers are set up so that a change in BW control is centered about a specific frequency. Quite often this frequency is different between modes. CW, RTTY and SSB are usually different. The "Sweet Spot" entries allow you to tailor the response of fldigi to your specific transceiver. This is really only useful if you are using a hamlib or memmap enabled transceiver. In that case when you elect to "QSY" using the main panel QSY button fldigi will command the transceiver to change frequency and it will also change its audio tracking point so that the currently tracked signal will be put into the center of your transceiver bandpass, the "Sweet Spot." You can also specify that you want the audio tracking point set to the sweet spot for that mode each time that the mode is selected from the operating modes menu. |