The PR430 is a small device integrating a TNC and a 70cm 6W-transceiver optimized for packet radio (1200 Bd. AFSK & 9600 Bd. FSK) use. It is connected to the host system through a RS232 interface using the common 9-pin sub-D connector. It is running enhanced 6pack as the line protocol.
The PR430 can also be used as a FM-TRX and as POCSAG-TX. It was developed by the German company SR-Systems.
Currently Linux does not support enhanced 6pack, therefor special drivers patches are needed. The patch is available at http://www.linux-mips.org/pub/linux/mips/people/ralf/pr430. The FM-Transceiver and POCSAG transmitter mode are currently not supported.
The enhanced 6PACK driver is configured via sysfs. To configure the device sp0 to a receive frequency of 438.350MHz with a shift of -7.6MHz use the following commands:
echo 438350000 > /sys/class/net/sp0/tnc/qrg echo -7600000 > /sys/class/net/sp0/tnc/shift
But there are some more files in sysfs:
root@kiste ~]# cd /sys/class/net/sp0 [root@kiste sp0]# ls -l tnc total 0 -r--r--r-- 1 root root 4096 Jul 10 20:52 author -rw-r--r-- 1 root root 4096 Jul 10 20:52 bitrate -r--r--r-- 1 root root 4096 Jul 10 20:52 hwtype -r--r--r-- 1 root root 4096 Jul 10 20:52 major -r--r--r-- 1 root root 4096 Jul 10 20:52 minor -rw-r--r-- 1 root root 4096 Jul 10 20:52 qrg -rw-r--r-- 1 root root 4096 Jul 10 20:52 shift -rw-r--r-- 1 root root 4096 Jul 10 20:52 txpower [root@kiste sp0]#
Here is what they mean:
This file contains a number which stands for the author of the devices firmware. In case of a PR430 this is a 7 which stands for Gunter Jost, DK7WJ.
This file contains the configured bitrate of the device. In case of the PR430 this is either 1200 or 9600. 1200 implies AFSK, 9600 implies FSK as modulation mode.
This file contains a number which encodes the hardware type. 4 stands for a PR430.
This is the major version number of the device.
This is the minor version number of the device.
The RX frequency in Hz.
The TX offset in Hz.
This is slightly confusing. Well, hopefully not. The driver will accept values in three different units which are shown in the last three columns of the following table. The first column is the actual power this will result in
Watt order raw dBm 0 0 0 0 300mW 1 16 25 1W 2 64 30 6W 3 255 38