Operation Manual

23FT-8900R Operating Manual
BASIC OPERATION
TRANSMISSION
To transmit, simply close the PTT (Push To Talk) switch on the microphone.
The FT-8900R will transmit only on the “Main” band. During transmission, the “ ” icon
will appear at the upper right of the “Main” frequency field on the display.
Changing the Transmitter Power Level
You can select from among a total of four transmit power levels on your FT-8900R.
To change the power level, press the
[
LOW
]
key to select one of four power settings. These
power levels will be stored, in memory registers, at
the time of memory storage (see page 32 for details
on Memory operation).
During transmission, the Bar Graph will deflect in the display, according to the power out-
put selected.
You may change the power level on the “Main” band using the microphone’s
[
P4
]
key.
Notice
The FT-8900R may receive very strong signals on the Image frequency, and/or the receiver
sensitivity may be somewhat reduced by the combination of the “Left” and “Right” band
frequencies while Full Duplex operation is engaged.
If you experience interference that you suspect may be coming in via a frequency “Mix,” you
may calculate the possible frequencies using the formulas below. This information may be used
in the design of effective countermeasures such as traps, etc.
 “Right” band 144 MHz TX freq. – 100.35 MHz = “Left” band IF freq. or “Left” band 2nd IF freq.
Image
 “Left” band 28 MHz TX freq. – 11.7 MHz = “Right” band IF freq. or “Right” band 2nd IF freq.
Image
 “Left” band 50 MHz TX freq. – 58.5 MHz = “Right” band IF freq. or “Right” band 2nd IF freq.
Image
 (“Right” band 144 MHz RX freq. + 47.25 MHz) x n1 – (“Left” band 28 MHz TX freq.) x n2 =
“Right” band IF freq. or “Right” band 2nd IF freq. Image
 (“Right” band 430 MHz RX freq. – 47.25 MHz) x n1 – (“Left” band 50 MHz TX freq.) x n2 =
“Right” band IF freq. or “Right” band 2nd IF freq. Image
 (“Left” band 50 MHz RX freq. + 45.05 MHz) x n1 – (“Right” band 144 MHz TX freq.) x n2 =
“Left” band IF freq. or “Left” band 2nd IF freq. Image
 “Right” band 144 MHz TX freq. – (“Left” band 50 MHz RX freq.+ 45.05 MHz) x n1 =
“Left” band IF freq. or “Left” band 2nd IF freq. Image
 144 MHz TX freq. x n1 – (430 MHz RX freq.– 45.05 MHz) x n2 =
“Left” band IF freq. or “Left” band 2nd IF freq. Image
 144 MHz TX freq. x n1 – (430 MHz RX freq.– 45.05 MHz) x n2 + 11.15 MHz = “Left” band IF freq.
or “Left” band 2nd IF freq. Image
 “Right” band 430 MHz TX freq. x n1 – (“Left” band 50 MHz RX freq.+ 45.05 MHz) x n2 =
± “Left” band IF freq. or “Left” band 2nd IF freq. Image
 430 MHz TX freq. x n1 – (144 MHz RX freq.+ 45.05 MHz) x n2 =
“Left” band IF freq. or “Left” band 2nd IF freq. Image
LOW
5 W
MID 2
10 W
MID 1
20 W
HIGH
50 W
(
35 W: 430 MHz
)