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[aprssig] APRS Messenger now has APRS over PSK-63

Chris Moulding chrism at crosscountrywireless.net
Sun Feb 28 22:46:41 UTC 2010


Following Stephen's explanation I've just uploaded a 1800 Hz version of 
APRS Messenger v2.33 to the webpage:

http://www.crosscountrywireless.net/aprs_messenger.htm

The other audio tones, 700, 1300 and 2100 Hz are also available.

APRS over PSK-63 activity is increasing daily in Europe and the US. It's 
a quick and cheap (free) way of getting on HF APRS. The amount of 
feedback I'm getting on the program is helping development. It already 
has a TCP/IP link to export HF APRS packets to map display on 
APRSISCE/32 and RadioMobile,  soundcard selection, selectable HF beacon 
rates, VHF / HF stations heard listboxes and a lot of improvements over 
the initial version. Over the next few weeks I'll add GPS input to allow 
mobile HF tracking over PSK-63.

73,

Chris, G4HYG

Chris Moulding
Cross Country Wireless (2009) Ltd
7 Thirlmere Grove, Bolton, Lancs, BL4 0QB, UK
Tel/fax: +44(0)1204 410626
Mobile:  +44(0)7752 391908
Website: http://www.crosscountrywireless.net
Company number 6780346 registered in England and Wales  


>
> 5)     Operating on *LSB* (rather than *USB*)  *INVERTS* the tone 
> relationship; i.e. the higher the audio tone, the LOWER the resulting 
> RF frequency.
>
> If one places the PSK63 tone 300 Hz below the lower AGWpe packet tone 
> of 2100, it will be safely within  the SSB audio passband.   (A new 
> version of APRS messenger running at 1800 Hz would be required.)   
> Setting the radio to a suppressed carrier (i.e. "dial") frequency of 
> 10.151.500 MHz LSB will invert the tone relationships and yield the 
> following:
>
>
>      10.151.500 - 1.800 = 10.149.700   PSK63
>
>      10.151.500 - 2.100 = 10.149.400   Packet SPACE
>      10.151.500 - 2.300 = 10.149.200   Packet MARK
>



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