Owner`s manual

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M15-OM-11/11
OPERATION
An on-off “rocker” type switch is in the center of the front panel. When lit, the built-in green LED
indicator shows that (1) the switch is in the on position (2) the equipment is receiving power from
the ac line (3) the internal dc power supply is operating. To operate, the M15 transceiver, which
projects through M15-25 the rack panel, must also be turned on by rotating its volume control
switch clockwise. If the squelch control knob is turned fully counterclockwise, receiver noise
should be heard in the speaker; the noise should get louder as the volume control is rotated more
clockwise. If there is to be no operator at the radio, and only remote operation is to be used, the
volume control may be set to minimum (fully CCW, without turning radio off).
It is not necessary to turn off the M15 if the M15-25 is turned off—the power to the M15 is removed
when the front panel rocker switch is turned off (green LED goes off). If the M15 has more than
one frequency, select the desired channel. Frequency selection may not be made remotely. If the
M15 contains crystals for only one channel, the frequency selector switch will have two positions
and either position will select the one available frequency.
If the background noise is annoying, it can be eliminated by rotating the squelch control clockwise.
Turn the squelch knob only as far as necessary to stop the noise—turning it farther than necessary
may prevent calls from distant aircraft from being heard in the receiver’s speaker. If it is
anticipated that it may be necessary to receive some very weak signals, use no squelch at all
(control fully CCW).
To transmit to an aircraft, fully depress the push-to-talk (PTT) switch on the microphone and speak
clearly and distinctly into the front of the microphone. Use a normal voice—not too soft nor too
loud (many readability problems are caused by poor “mike technique”). If the microphone is a
noise-canceling type it is absolutely necessary to hold the microphone very close to your mouth—
these microphones are very sensitive to this distance.
A red LED lamp on the M15 lights up when power is applied to the transmitter by pressing the PTT
switch. If this lamp stays on after the PTT button is released, a “stuck microphone” is indicated. If
you cannot release the PTT switch (button), turn off the radio or remove the microphone plug so
that your continuous transmission will not prevent others from using the radio channel.
In an emergency, you can transmit by plugging the microphone back in each time you want to
transmit. Although this equipment has been designed for congested radio signal environments,
very strong nearby transmissions on other channels may “bleed through” or desensitize the
receiver. This does not mean that the receiver is operating improperly. If interference is a
significant problem, contact Mentor Radio for assistance.