[Motorola] Multiple mobile radios on one band (Was: Re: Installation Tips

[tvsjr]

Actually, redundancy and the ability to transceive on multiple channels in 
one band simultaneously is the reason.

The "cheapest" radio I'm using is a Uniden 780XLT, in contrast with 
Spectras and an Orion. The only trouble I have is if one of the VHF 
Spectras or the Kenwood happens to be receiving on certain channels when 
the D700 braps out an APRS packet, it will introduce some white noise. I've 
never had any damage to the front end. The vehicle is an Expedition, and 
I'm running 12 antennae on the roof in a 4 row, 3 column layout, plus a GPS 
antenna, and a dual-band 2m/70cm and a 27MHz CB antenna lip-mounted off the 
hood.

Yes, all 15 run, all the time, all in scan. Once you listen for awhile, you 
get a very tuned ear and can easily pick out important from non-important 
traffic.

The only radio I've ever seen damaged was a Motorola Maratrac that blew a 
T/R relay (of all things) as a result of keying an X9000 on VHF. Easily 
fixed, and no big problem.

Terry

At 11:34 AM 09/20/2002 -0700, Glen Zook wrote:
>I have never run into any damage to a receiver from
>other transmitters in the same vehicle.  There is
>definitely "de-sense", not only on those on the same
>band, but often on the other bands as well, when a
>transmitter is activated.
>
>Just how to tell which radio is talking requires skill
>in knowing what traffic is normally on which
>frequency.
>
>Making each microphone a different color combination
>does help with keeping them "straight" when
>transmitting.
>
>Now, the particular Fire Chief with 9 radios in his
>squad car was known by his friends as "Code 3",
>meaning that he went virtually everywhere running
>"Code 3".  He was accused quite often of running "Code
>3" to his coffee break!  This, of course, wasn't
>really the case, but it made for lively conversation.
>
>Frankly, with today's technology, having more than a
>very few radios in a vehicle is not necessary.  But,
>there are always those who do use the older equipment
>(either out of necessity or out of nostalgia) and who
>run a lot of radios in their mobile installation.
>
>Myself, having come from the Twin-V still being in
>common use to the modern solid-state equipment,
>definitely prefer the modern gear!  By the way, back
>in high school (1959), my first 2 meter FM rig was a
>Motorola FMTU-30D transmitter and an FMRU-16V receiver
>(twin casket sets).  The 5V and 41V were too new to be
>available for most amateur use.
>
>Glen, K9STH
>
>
>--- Gary Chatters <gc@radix.net> wrote:
>
>Did those of you with multiple rigs have any problems
>with interactions?  I expect transmitting will desense
>all other radios in the same band, but is there any
>possibility of front end damage?
>
>=====
>Glen, K9STH
>
>Web sites
>
>http://home.attbi.com/~k9sth
>http://home.attbi.com/~zcomco
>
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