Have you looked at SvxLink? This is not Windows, but Linux. The installation is not complicated, and with SvxLink you only need a PC, no external hardware.
At our repeater we use two or three RX linked in via internet. On the reciver sites the only needed hardware is the RX itself and a PC. The PC should be a 200MHz CPU or more. SvxLink can handle all DTMF decoding, CTCSS, Voting etc. http://svxlink.sf.net 73 de Gus, SG3P
