Repeater in a Box
semi-permanent, moving mobile
one approach to getting a
repeater to easily live in a vehicle with an eye on
simple swapping to other vehicles as desired with
I decided to box up the repeater
so that it was primarily self-contained. This would simplify
moving it from vehicle to vehicle. I additionally wanted to be
able to turn the box on its side to that it could sit on the floor
behind the passenger seat in a sedan if not placed in the trunk.
So the mounting of the repeater as well as the rest of the stuff
inside the box could be kept intact in either type of "mounting".
The batteries are handled differently.
The repeater is screwed into and
completes the forth side of the box. The box height is abut 3
inches taller than the repeater to accommodate the router, the 12V
controller and miscellaneous cabling. The box has large holes
drilled into the sides and back primarily for easy cable penetration
as well as ventilation if either the power supply an/or RF power
amplifier fans are switched active.
The UHF duplexer/antenna is
optional as I typically use a "leaky" resistor dummy load on the
transmitter connector (at 1 watt RF output) and spike on the
receiver connector, good for about 1/4 mile. I use a default
10 Mhz split without a duplexer with no issues.
Use of batteries and the 12V
controller enables continuous operation without regard to the
vehicles "start" battery. I have an optional 8 foot
cable that I can power pole into the mux with a DPDT switch for
router on/off as well as repeater on/off at the driver's finger tips. I have had
a couple cellular issues that did
require a reboot, so this approach is handy while in motion as well
as flexible depending on the current "install".
I get about 12-14 hours on a
single 22AH SLA battery including the normal TX time (1.1 amps idle
and 2.4 amps TX).