[Xastir] 300 baud off-air data into Xastir

[Chris Moulding]

Hi, 

Recently I've been toying with the idea of making a HF 300 baud APRS 
transceiver for RAYNET use to provide APRS coverage in the large areas 
outside the range of 2m coverage in the UK.  It will probably eventually 
use a frequency on 160m to provide ground wave propagation over the 
local hills. 

I've got the transmit side working OK using an OT1+ tracker with direct 
data output at 300 baud using a direct FSK transmitter on 10.1492 / 
10.1494 MHz (G4HYG-10 test transmitter) and I'm now working on a simple 
HF APRS receiver using an audio filtered XR-2211 PLL IC to receive the 
off-air data. That's now working OK but I need to find a way to feed the 
raw off-air (HDLC?) data into Xastir. 

I notice that there is no data rate option in the AX25 serial modem 
interface setup box. Is there a way to set it up so that it can use the 
raw off-air 300 baud data without an intervening KISS TNC? I think it 
will work the same as a Baycom modem except at 300 baud? If the AX25 
data rate can be changed from 1200 baud to 300 baud then it should work 
on transmit as well? 

I apologise if the question is not worded correctly as I'm really a pure 
RF man and the various data protocols tend to confuse me! 

73, 

Chris, G4HYG