66
FT-1900E O
PERATING
M
ANUAL
FM B
ANDWIDTH
& TX D
EVIATION
L
EVEL
You can reduce the receiver bandwidth and microphone deviation level when operating on
tightly-clustered frequencies (channel spacing of 12.5 or 15 kHz). This will reduce the
transmitter deviation, thus minimizing interference to other users.
To configure for the narrower bandwidth, use the following procedure:
1. Press and hold in the [
MHz
(
SET
)] key for one second, then
rotate the
DIAL
knob to select “
59 W
/
N DV
.”
2. Press the [
MHz
(
SET
)] key, then rotate the
DIAL
knob to
change the display to “
NARROW
(±2.5 kHz Deviation, 6
kHz Bandwidth)”.
3. Press and hold in the [
MHz
(
SET
)] key for one second to save the new setting and exit
to normal operation.
4. To return to wide bandwidth and deviation, repeat the above procedure, selecting “
WIDE
(±5 kHz Deviation, 15 kHz Bandwidth)” in step 2 above.
MIC G
AIN
S
ETTING
At the factory, a microphone gain has been programmed that should be satisfactory for the
supplied
MH-48
A6J
Microphone. If you use an after-market microphone or connect a TNC,
you may wish to set a different Mic Gain level, using Set Mode item “
27 MCGAIN
.”
1. Press and hold in the [
MHz
(
SET
)] key for one second, then
rotate the
DIAL
knob to select “
27 MCGAIN
.”
2. Press the [
MHz
(
SET
)] key, then rotate the
DIAL
knob to
set the desired level (Default:
LVL 5
).
3. Press and hold in the [
MHz
(
SET
)] key for one second to save the new setting and exit
to normal operation.
Remember to readjust the default microphone input level to “
LVL 5
” when using the sup-
plied
MH-48
A6J
Microphone.
M
ISCELLANEOUS
S
ETTINGS
