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On 2006-07-24 (ScottDorsey) said:
I wrote:
Also if you get the licensing you have higher power, regular
commercial uhf business channels with proper licensing would
give you higher power legally with better reliability.
YOu're not feeding full range stereo with desire for high
fidelity with these things I"d assume, so communications
grade audio should be good enough. GO for the wireless mic
frequencies with a license or regular commercial UHF
business band, get the license, have the higher power and
the advantages that come with it.
I was presuming full range stereo. If you just need communications
grade stuff, there are LOTS of alternatives out there, some of
which are just solid as hell. I'd first start looking at low band
VHF gear... there is a lot of it out there, and aside from the
itinerant frequencies (and the broadcast aux frequencies), the
licensed channels are dirt cheap.
I"m with Scott here. I"m presuming for a car show it's
voice announcements, not hi fidelity stereo for paging,
crowd control etc. YOu can also use these channels between
your trucks and the shop too btw George.

I don't think I'd want to rely on something like that for an
application that had to be reliable. Things like paging systems at
outdoor events have to be reliable, if only because they sometimes
have to be used for crowd manageent in crisis situations.
I"m assuming here you're talking about those little consumer
fm broadcast transmitter kits.

IN another post in this thread George talked about how he'd
played with it while listening to it on his console at home
while placing it over a hill. yEs there's a bit of
defraction or bending that can happen with these fm signals,
but it's still essentially line of sight. Have somebody
walk between your stereo console's antenna and the
transmitter while you're listening to it. TO get enough
signal strength to fully quiet the receiver in some
situations is going to require some more field strength than
you can legally get with one of these in many applications.
YEs I've played with low power transmitters for years, I"m
an active ham radio and I work with vhf and uhf on a regular
basis.
sOme enhancement via the troposphere and other effects can
increase range at times, but for your application I'd think
it too unreliable to take to the bank. INcreasing antenna
gain and/or height can also get you in trouble, and a bust
can really put the old crimp in your business plans and
livelihood. Low band vhf gear is going cheap these days
with a lot of communities going with state of the art uhf
systems, both trunked and conventional. sHOp some ham
fests, talk to a local commercial two-way dealer and get set
up with the licenses. AS I said, you can even use them
between your shop and your vehicles, or possibly on the job
site with setup of a conventional sound system.




Richard webb,
Electric Spider Productions
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