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Phone: 216-265-2315 Fax: 216-267-2915
www.mentorradio.com
(11/11)
M2115 OWNERS MANUAL
Solutions for Advancing Communications
Menu Buttons [4.7.4]
Pressing a menu button changes either some value on the screen or changes what screen a user is viewing entirely.
Menu buttons are referred to menu buttons 1 - 4, going from left to right when looking at the front panel head on (see the
front panel diagram
for visuals). Text above each button describes what each button will do on any given
screen
, while
the
high VSWR override
functionality is accessible from every screen and only requires that a user is not in transmit mode
to change the state.
Rotary Knob [4.7.5]
The rotary knob serves several purposes on some screens and none on others. Most uses are for increasing or
decreasing the value of a selected field on a screen, but that is not all it is used for. When there is a screen that includes
an “Enter” and/or “Exit” menu option, users may press the rotary knob once for “Enter” and twice for “Exit”. Each screen
uses the rotary knob differently. See the individual
screens
for rotary knob functionality in its entirety.
Internal Speaker [4.7.6]
A 2” x 2” speaker is mounted on the bottom panel on the M2115M for mobile applications. A 3.5” x 2” speaker is mounted
on the front panel of the power supply for base station units. The M2115B-XX also includes an interface for a variety of
remote control connections.
VSWR [5]
VSWR is an acronym for Voltage Standing Wave Ratio. VSWR is a measure of the ability of the transmitter to radiate RF
power through the antenna and into open space compared to the signal that is reflected back into the transmitter. The
more reflected power that does not leave the antenna, the higher the chance that there is excess energy that may
damage the transmitter components. Therefore, it is very important to shut down the transmitter when there is a high
reflected power to help prevent damage to the transmitter.
Under normal operating conditions, the transmitter is shut down when a high VSWR is read. Recognizing that there are
times in the aviation industry where communications capability may be the difference of life and death, Mentor Radio has
provided the ability of the M2115 to override the high VSWR transmitter shut down function. To disable the high VSWR
transmitter shut down function, a user needs only to hold down menu buttons 1 and 3 for around 3 seconds while the
radio is powered up and in receive mode.
Realize that if the PA blows up when VSWR control is overridden, then
any warranty is instantly void.
To re-enable the high VSWR control function hold down buttons 1 and 3 for another 3
seconds. It does not matter what screen that a user is on to enable or disable the override, but the main screen shows
that the control is disabled by displaying “OV” on the upper left of the screen. When a high VSWR is encountered, a user
should cut the power to the radio and inspect/repair the transmission line as soon as possible.
