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Re: Proper pi9k6 configuration for AX.25 and PAT

 

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The default params are:

TXDELAY 30
PERSIST 64
SLOTTIME 10
TXTAIL 0
FULLDUP 0
KISSCHANNEL 0
I2CADDRESS 30
Baud 12
Centre Freq 170
RX Level?? 0
TX Level?? 30
centreFreq? 1700
?
I2C Address isn't used - that is set in the config when building the software.

As it seems you are transmitting ok then the chances are the out of range parameter values are being ignored.

You have the RX Level set to auto. This normally works ok, so long as you are using unsquelched audio, but it would be worth checking that the received audio is in range.? If you have #define MONPORT Serial in TeensyConfigPacket.h then debug output will be written to the USB port. So if you connect the USB port either to the pi or another host and run a terminal program on it you should be able to get a better idea of what is going on.

Although the TNC works on i2c the interface isn't very efficient, so you you need more than one and have a spare USB port I suggest you use the USB host interface instead if i2c.

73,
John


On 02/02/2022 20:48, KN6FOA wrote:

I am having issues with getting AX.25 to work correctly with PAT.

I was finally able to build the firmware and flash the Arduino with the I2C settings for my pi9k6 TNCs.?I am using "sudo i2ckiss 1 8 wl2k 127.0.0.1" to bind to the AX.25 port "wl2k" which is defined as "wl2k KN6FOA-10 1200 255 7 Winlink" in the axports file.

I am attempting to connect to a gateway running 1200 baud PACKET and I can hear data being sent by listening on another radio and I can hear responses from the RMS on the radio attached to the TNC but it does not seem to want to lock to the station.? PAT just returns "Unable to establish connection to remote: Dial timeout" and never fully connects.? I know the radio and the cable works as plugging it into a Kantronics TNC to my laptop works so I'm sure it is either a software config issue or something to do with the pi9k6.? I have pasted my TNC settings below to see if it is something there that needs to be adjusted.

pitnc_getparams Version 0.0.0.5
?
? ?TNC Software Version? ? ? ? ? 14
01 TXDelay - Zero means use ADC? 40
02 Persistance? ? ? ? ? ? ? ? ? ? 3
03 Slottime (in 10 mS)? ? ? ? ? ? 1
04 TXTail? ? ? ? ? ? ? ? ? ? ? ? ?1
05 Full Duplex - Not used? ? ? ? ?0
06 Our Channel (Hex)? ? ? ? ? ? ?ff
07 I2C Address (0 = async) Hex? ?ff
08 Mode Speed? ? ? ? ? ? ? ? ? 1200
09 RX Level (Config)? ? ? ? ? ? ? 0
10 TX Level? ? ? ? ? ? ? ? ? ? ? ?8
11 RX Level (Actual)? ? ? ? ? ? ? 0
13 Centre Freq? ? ? ? ? ? ? ? ?2550

Using "sudo axlisten -cartt" I get the following ("I redacted the gateway with ABC123")
wl2k: fm KN6FOA to ABC123-10 ctl SABM+ 1643834542.429915?
wl2k: fm KN6FOA to ABC123-10 ctl SABM+ 1643834552.502680?
wl2k: fm KN6FOA to ABC123-10 ctl SABM+ 1643834572.982760?
wl2k: fm KN6FOA to ABC123-10 ctl DISC+ 1643834587.475165?
?
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