Changes:
- Soundcard sample rate changed from 12000 Hz to 48000 Hz.
- Alert function added (including UDP broadcasting).
This function allows to generate an alert when a received message meets certain criteria. One or more of following criteria can be selected:
* Your call is received.
* A new call is received.
* A new DXCC is received.
* A new US state is received.
* A DX station (more than xxx km) is received.
* A new DX station (more than xxx km) is received.
* A call from the included list is received.
In case of an alert:
* The DTR or RTS pin of a serial port can be set high. This can be used to trigger an alarm.
* A UDP message can be broadcasted. UDP messages can be copied on any device (computer, tablet, smartphone) within the same LAN.
I did also write a small app named SlowJT9_Monitor that can
be used to receive and display the UDP messages on another computer.
- A Front End Mixer added:
The resampling and decoding process limits the maximum RX audio frequency to 4980 Hz for JT9-1, 2240 Hz for JT9-2, 840 Hz for JT9-5 and 415 Hz
for JT9-10. This can be inconvenient if a higher RX audio frequency is needed to fit the signal in the passband of a narrow filter.
This can be fixed by using the Front End Mixer that downconverts the incoming audio signal (fOUT =
fIN - fLO).
E.g.: if you want to downconvert the 1200 .. 1400 Hz incoming audio to 400 .. 600 Hz the local oscillator frequency must be set to 800 Hz.
Bug reports, remarks and suggestions are welcome.
