Owner`s manual

www.mentorradio.com
Phone: [phone] * Fax: [phone]
M15-OM-11/11
INSTALLATION
The M15-25 can either simply rest on a shelf or desk, or it may be mounted in a 19 inch relay rack.
When rack mounted, rear support is not required. This unit does not contain a cooling fan, and
does not normally need one. However, when rack mounted there should be a minimum of 1-1/4
inch above and below the cabinet to allow air circulation. When the M15-25 is located on a desk or
shelf, do not place equipment, papers, magazines, etc. on top of it that would restrict its ability to
stay cool.
Note that during extended or frequent transmissions, the heat sinks on the rear panel will become
quite hot. While these have nylon covers for safety, under heavy use conditions operators should be
cautious about reaching behind the M15-25 and touching these parts. Power is applied via a
standard power inlet and IEC removable line cord. A rotary switch on the inlet allows selection of
either 115 or 230 volts ac. The fuse is (part of power inlet), a 4 amp. “international” type, can be
replaced by pulling out the fuse holder section (the cord must be removed first; and a light pry
from a screw driver may help in accessing the fuse). There is room for a spare fuse inside the
power inlet.
The antenna connector is type N. If the antenna coax does not mate with this type, adapters are
available from Mentor Radio or from many electronic distributors. Connections for remote
operation, when needed, are made via the 25 pin connector (type DB25) on the rear of the cabinet.
The antenna should be either a wideband type (118-137 MHz) or a narrow band type tuned to the
channel frequency. If a 3 or 6 dB gain antenna is used, communications range will be increased,
because gain antennas effectively increase both receiver sensitivity and transmitter power.
Low loss coaxial cable is recommended, especially if the cable length exceeds 30 feet (10 meters).
Plug an aircraft type or suitable pedestal type microphone into the microphone jack on the front
panel of the M15. Be sure the plug is pushed all the way into the jack. If remote operation is to be
used, refer to the section on this subject later in this manual.