From a pure legal point of view (regulation concerning the FM band, the privacy of short waves transmissions a.s.o), it could be more interesting to use another dispatching technique. Why don't you choose a simple bluetooth piconet (quite efficient in voice transmission applications) or a 802.11 network and a VoIP protocol ? The WiFi receving part could be very expensive... and you have to hack a WiFi based phone gear to receive your audio. But Ethernet is powerfull enough to offer you the "way back" that FM transmitters cannot afford. Data stream tho change the frequency or the band, for exemple. Using Bluetooth is cheaper... wireless headphones are sold in every cellular shop, and the hack of the transmitting part could'nt be a big problem (a used PDA sold on e-bay, a bluetooth pcmcia card...) A third and simpler solution is to use a Dect or any UHF 900 MHz hand free phone system, directly plugged in the audio output of your rig (your even can use the mic input...). Most of those phone systems have intercom capabilities. You even can, depending on you installed base, use the DTMF signals to remotely control your ham equipement. Could be fun:- )
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From a pure legal point of view (regulation concerning the FM band, the privacy of short waves transmissions a.s.o), it could be more interesting to use another dispatching technique. Why don't you choose a simple bluetooth piconet (quite efficient in voice transmission applications) or a 802.11 network and a VoIP protocol ? The WiFi receving part could be very expensive... and you have to hack a WiFi based phone gear to receive your audio. But Ethernet is powerfull enough to offer you the "way back" that FM transmitters cannot afford. Data stream tho change the frequency or the band, for exemple. :- )
Using Bluetooth is cheaper... wireless headphones are sold in every cellular shop, and the hack of the transmitting part could'nt be a big problem (a used PDA sold on e-bay, a bluetooth pcmcia card...)
A third and simpler solution is to use a Dect or any UHF 900 MHz hand free phone system, directly plugged in the audio output of your rig (your even can use the mic input...). Most of those phone systems have intercom capabilities. You even can, depending on you installed base, use the DTMF signals to remotely control your ham equipement. Could be fun