I bought my car2car intercom setup from
Desert Communincations.Kevin Harris is a good guy, a firemen that sell these setups on the side. He has everything, radios, intercom, hand helds, headsets, helmet kits, cabling, adapters, programming service, everything you need.
The key decision you have is to buy headsets, or helmet kits, or both? I prefer wearing a helmet, so my helmet has the speaker/mic kit installed. Those kits are $75 and can easily be installed with a hot glue gun. You use a dremal tool to slightly shape the helmet foam at the ear to hold each speaker then glue it in. Headsets are about $125-$150/ea, make sure you get the soft earmuff covers if you buy headsets.
Radios have to be programmed with memory channels. Using a VHF radio offers the best range, usually 30 to 50watt output which will go a good 20+miles. You need to tell your supplier what frequencies you want for each memory channel. This is usually dictated by who you plan to talk with. Many of the radios are user programable, but you'll need to be patient, some radios can be tricky to follow the directions. Your supplier should volunteer to train you how to program the memory channels.
One of the issues you learn about is the music you want to play. The intercom's primary use is to communicate with your passengers, effortlessly. This is a huge convenience, it really makes things nice. I like running my intercom with an open mic so I can hear everything all passengers say, and there's never a delay in the mic turning on and off. If you plan to play your ipod in the system you'll need to adjust the squelch so the music can be heard when nobody is speaking. When someone speaks the music is interupted so you can hear the passenger with NO music. When you stop speaking, the music comes back.
There are two things you'll l learn:
1. There's a slight delay to sense your voice to turn on the mic, but this isn't a big deal, you just have to get use to it and say "Attention" or "Uhh" or simply drag out your first word in the beginning until the music goes off so you can continue with your sentence.
2. The sound of the sandrail motor can sometimes be loud enough to turn off the music and turn on the mic. The mic thinks your speaking when it's really the sound of the motor. So this means you have to tune the squelch a little higher to compensate for a loud exhaust, which means you have to talk a little louder to turn the mic on.
I prefer not yelling into the mic to turn it on, so I run an open mic with the squelch turned all the way down. I don't listen to music, I listen to my passengers, and you can have a quiet conversation with any of the passengers with an open mic. I find things more fun that way, and more calming for newbies that may be a little scared in the beginning. You may find the same, but everyone's different.