Hi all:
I want to add a couple of words about using radios on car tours. In my Z3 car club somehow FRS radios became the standard. I have at least 5 years experience and in my opinion they are marginal.
The good things about FRS radios are that they are relatively cheap, easily available, compact, and have way more channels than users. You never have to change channels to get away from other users with FRS.
The biggest problem with FRS is the relatively short range. They are limited to 1/2 watt power to the antenna. Manufacturers quote 2 miles across open space, to me it's more like 1 mile at most. Operating at about 470 MHz, FRS radios are basically line of sight, so if you're on twisty roads or hilly terrain, you will lose the other cars you're traveling with pretty easily.
The other issue with most FRS radios is that they have pretty small
speakers. This means the intelligibility is pretty poor, especially in a convertible with the top down. I have taken to using an external 3 inch speaker I bought at
Radio Shack, it really helps.
CB radios have a different set of problems. They use a lot more power - 5 watts maximum - so they are much bigger than typical FRS radios. In return for this, you usually have a bigger speaker so they sound better. You also have much better range, both due to the higher power and the 27 MHz operating frequency. You can get 5 miles range repeatably and sometimes much more.
The CB range only has 40 channels so it's occasionally hard to find an open channel, although I bet 90% of the traffic is on channel 19. If you've never listened to the truckers on a big highway it's an eye opening experience!
A decision you have to make with CB radios is that you have to chose between a dash mount unit and a handheld. Dash mount units are the best but they are basically confined to truck drivers these days. Handhelds have lower power but that's basically all you see in cars these days. I have a Cobra handheld which works well, but it's 3 or 4 times the size of my Motorola FRS
radio and takes 6 AA batteries vs. 3 for the FRS.
I hope this helps, but I guess the bottom line is that you need to have the same kind of
radio everyone else on the drive has!
Tom M.