Справочник Пользователя для ICOM 318200

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6

FUNCTIONS FOR TRANSMIT

N

The IC-7410 has a built-in circuit for measuring an-
tenna SWR— no external equipment or special adjust-
ments are necessary.

The IC-7410 can measure SWR two ways— spot mea-
surement and plot measurement.

D

q  Push [TUNER] once or twice to turn OFF the an-

tenna tuner.

w

twice, to select the SWR meter.

e  Push [RTTY] to select the RTTY mode.

r  Push [TRANSMIT] on the transceiver, or [PTT] on 

the microphone to transmit.

t  Rotate the [RF PWR] control clockwise past the 12 

o’clock position for more than 30 W of output power 

y Read the SWR on the SWR meter.

u Push [TRANSMIT] or release [PTT] to receive.

The built-in antenna tuner matches the transmitter 

to the antenna only when the SWR is less than 3:1.

D

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).

s

w  Rotate the [RF PWR] control clockwise past the 12 

o’clock position for more than 30 W of output power 

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 set the SWR measuring step to 10, 50, 100 or 
500 kHz.

t  Push [F-3] one or more times to select the number 

of measuring steps to 3, 5, 7, 9, 11 or 13.

y Push [F-1] to start the measuring.

u  Push [TRANSMIT] on the transceiver, or hold down 

[PTT] on the microphone to transmit, to measure 
the SWR.

s

∫,” 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 the SWR over 

the entire frequency range.

!0  When the measured SWR is less than 1.5:1, the 

antenna is well matched with the transceiver in the 
measured frequency range.

M E M

S C 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

s

SWR

1 0 k

S T E P

A frequency marker appears and moves 
after measurement.
When measurement points are set out-
side of the operatable frequency band, 
the frequency marker blinks.

— 1.0:1

— 1.5:1

— 2.0:1

— 3.0:1

A G C

1 ⁄ 4

R T T Y

S C P

M 1

The best match is in this range.

Typical display SWR varying between 1 and 2, 
full scale up to SWR 4.0:1.