Posted by Richard Crowley on 01/12/64 11:51

"Martin Heffels" wrote ...
> "Richard Crowley" wrote:
>
>>"Martin Heffels" wrote ...
>>> "Teeafit" wrote:
>>>>They ARE on public frequencies, so there is always the risk of
>>>>someone
>>>>else listening in to your conversations, and even breaking in
>>>
>>> Get the ones with tone-locked squelch, so you have no interference
>>> of
>>> others. It is of course possible to find out your sub-audible
>>> frequencies
>>> with dedicated equipment, so if somebody is very nasty, they could
>>> still
>>> disturb you.
>>
>>But that doesn't solve the problem in some urban areas
>>where the channels are so heavily used that it is impossible
>>to get messages through exactly when you need them. This
>>is the major reason we gave up on FRS for produciton
>>intercom (i.e. directing camera operators).
>
> That of course depends on the output-power of the radios. The 5W
> versions
> should provide enough output to cover most interference when all
> radios are
> within close range. Indeed, if it gets very busy, like on an event, it
> will
> get impossible, and you would indeed be better off with a wired
> system, or
> something licensed where you are out of the PBR-spectrum (like VHF).
> I have used the 150mW UHF-PBR's in Sydney, which is quite
> "radio-active"
> and we never had any problems.
> Oh, thinking of this, in some countries it is not allowed to use PBR
> on a
> commercial-base, so better check this with the proper authorities.

Indeed, commercial use of the higher-power version
of FRS (GMRS) is illegal for in the USA.
http://wireless.fcc.gov/services/index.htm?job=service_home&id=general_mobile

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