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FUNCTIONS FOR TRANSMIT
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Measuring SWR
(Band: HF/50/144/430 MHz)
The IC-9100 has a built-in circuit for measuring an-
tenna SWR— no external equipment or special adjust-
ments are necessary.
The IC-9100 can measure SWR two ways— spot mea-
surement and plot measurement.
D
Spot measurement
q
Push [TUNER] once or twice to turn OFF the an-
tenna tuner.
w
Hold down [ANT•METER] for 1 second, one or
more times, to select the SWR meter.
e
Push [CW/RTTY] once or twice to select the RTTY
mode.
r
Push [PTT] on the microphone to transmit. (or
[TRANSMIT] on the transceiver).
t
Rotate [RF POWER] clockwise past the 12 o’clock
position for more than 30 W of output power (30%).
y
Read the SWR on the SWR meter.
u
Release [PTT] to receive. (or push [TRANSMIT]
again)
The built-in antenna tuner matches the transmitter
to the antenna when the SWR is less than 3:1*.
* 2.5:1 in the 50 MHz frequency band.
D
Plot measurement
Plot measurement allows you to measure the SWR
over an entire band.
q
Push [MENU] to display the “M2” screen (Menu 2),
then push [SWR](F-3).
• The SWR graph screen appears.
w
Rotate [RF POWER] clockwise past the 12 o’clock
position for more than 30 W of output power (30%).
e
Set the center frequency for the SWR to be mea-
sured.
r
Hold down [F-5] for 1 second one or more times to
select 10, 50, 100 or 500 kHz steps as the SWR
measuring step.
t
Push [F-3] one or more times to select 3, 5, 7, 9, 11
or 13 steps as the number of measuring steps.
y
Push [F-1] to start the measuring.
u
Push [TRANSMIT] or hold down [PTT] on the mi-
crophone to measure the SWR.
• A frequency marker, “
∫
,” appears below the SWR
graph.
i
Push [TRANSMIT] again or release [PTT] to move
the frequency marker and frequency indication to
the next frequency to be measured.
o
Repeat steps
u
and
i
to measure SWR over the
entire frequency range.
!0
When the measured SWR is more than 1.5:1, ad-
just the antenna to match with the transceiver.
D U P
A G C
1 ⁄ 4
R T T Y S C P
M1
The best match is in this range.
M E M
S C A N
S W R
T C O N
V S C
M 2
SWR
1 0 k
S T E P
Push
Start measuring
Select number of SWR measuring steps
Select SWR measuring step
•
Measuring
(after pushing [F-1])
SWR
1 0 k
S T E P
Frequency marker appears and moves
after measurement.
When measurement points are set
outside of the operable frequency
band, the frequency marker blinks.
Typical display SWR varying between 1 and 2,
full scale up to SWR 4.0:1.
— 1.0:1
— 1.5:1
— 2.0:1
— 3.0:1
The antenna SWR cannot be measured on the 1200
MHz frequency band*.
* The optional UX-9100 is required.
