Measuring Swr; D Spot Measurement - Icom IC-7100 Instruction Manual

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6
FUNCTIONS FOR TRANSMIT

Measuring SWR

The IC-7100 has a built-in circuit for measuring antenna
SWR— no external equipment or special adjustments
are necessary.
The IC-7100 can measure SWR two ways— spot mea-
surement and plot measurement.
D
Spot measurement
This function is convenient to use when measuring
SWR of the antenna to install or periodic check.
q If desired, push
TUNER/CALL
OFF the antenna tuner.
• If the antenna tuner is connected, and your want to mea-
sure SWR of the antenna itself, perform this step.
w
Select the desired frequency band. (p. 3-5)
e
On the Mode selection screen, select the RTTY or
RTTY-R mode. (p.3-??)
r
If necessary, adjust the RF power to more than 30 W
on the Mic gain/RF power adjustment display.
• If your are operating in the 144 MHz band, adjust the RF
power to more than 20 W.
• If your are operating in the 430 MHz band, adjust the RF
power to more than 15 W.
q Push
(C) to open the MIC gain/RF
MIC/RF PWR
power adjustment display.
w Rotate [BANK]
(L) to adjust the RF power.
e Push
(C) to close the display.
MENU
Before transmitting, monitor the operating fre-
quency to make sure transmitting won't cause
interference to other stations on the same fre-
quency.
t
Touch the TX meter one or more times to select the
SWR meter.
y
Hold down [PTT] on the microphone or switch ON
the external TX switch to transmit.
u
Read the SWR on the SWR meter.
• If the SWR meter points 1.5 or less, the antenna is
matched .
i
Release [PTT] or Switch OFF the external TX switch
to receive.
• When the measured SWR is more than 1.5:1, adjust the
antenna to match with the transceiver.
(L) once or twice to turn
6-13
L eft D isplay R ight
C enter
NOTE
This transceiver can measure SWR in the 144 MHz or
430 MHz bands.
Depending on the length of the connected coaxial
cable, or installation condition, the measurement may
be different from the actual SWR of the antenna in
these band.
RTTY mode icon
The best match is in this range.
(1.5 or less)
The L, R, C or D in the
instructions indicate the
part of the controller.
L: Left side
R: Right side
C: Center bottom
D: Display (Touch panel)
SWR meter