Thanks, John.  First, I verified that my PC firewall is being controlled by McAfee and that I have the firewall disabled in McAfee.  I’m running Dummy Repeater as admin in Win 7 compatibility mode.  I’ve tried it in XP and 8.1 mode as well.  Then, I took the following steps.   Note: I had to specify a TTY port when I started AMBEserverGPIO from the command line, so I blindly chose TTY1.  Also, I started Dummy Repeater twice, so there are two instances of AMBEserverGPIO receiving data.  

Still wondering what I’ve missed.  Is there a configuration file for AMBEserverGPIO?  I don’t remember doing any kind of configuration for it.  The only files I edited were /boot/cmdline.txt, /boot.config.txt, and /etc/inittab.

root@raspberrypi:~# cd DV3000/

root@raspberrypi:~/DV3000# ls

AMBEserver    AMBEserverGPIO    AMBEserver.o  AMBEtest3.py  dv3000d-AMBEserver.pdf  dv3000d.o  Makefile            README.txt

AMBEserver.c  AMBEserverGPIO.o  AMBEtest2.py  dv3000d       dv3000d.c               init.d     README-dv3000d.txt  wiringPi

root@raspberrypi:~/DV3000# service AMBEserverGPIO stop

Terminated

root@raspberrypi:~/DV3000# python ./AMBEtest2.py

d

8

N

1

False

False

False

0

▒

Reset

6100010033

Wrote: 5 bytes

Product ID

6100010030

Wrote: 5 bytes

Version

6100010031

Wrote: 5 bytes

Set DSTAR Mode

61000c000a013007634000000000000048

Wrote: 17 bytes

root@raspberrypi:~/DV3000# AMBEserverGPIO

An input tty filename (-i /dev/ttyXXX) or a COM port number (-c 3) must be set.

root@raspberrypi:~/DV3000# AMBEserverGPIO -x -i /dev/tty1

opened the Wiring Pi library

Reset DV3000

opened the UDP socket on port 2460

opened /dev/tty1

Wrote Reset 5 chars

Socket data

0000:  61 00 01 00 30                                     *a...0*

Socket data

0000:  61 00 01 00 30                                     *a...0*