![background image](http://html.mh-extra.com/html/icom/ic-703/ic-703_instruction-manual_612184070.webp)
55
6
FUNCTION FOR TRANSMIT
The IC-703 has a built-in circuit for measuring an-
tenna SWR—no external equipment or special ad-
justments are necessary.
The IC-703 can measure SWR in 2 ways:
(A) Spot measurement; or (B) Plot measurement.
(A) Spot measurement
q
Confirm that the output power is over 5 W.
w
Push [MENU] one or more times to select
M3
.
e
Push [
(F-3)
MET
] to select the SWR meter.
r
Push [MODE] one or more times to select CW or
RTTY operation.
• Key down or push [PTT] to transmit; then read the ac-
tual SWR from the meter:
➠
≤
1.5 well matched antenna
➠
>
1.5 check antenna or cable connection, etc.
(B) Plot measurement
Plot measurement allows you to measure the SWR
over an entire band.
q
Confirm that the output power is over 5 W.
w
Push [DISPLAY] once or twice to select
G
.
e
Push [MENU] one or more times to select
G2
.
r
Set the center frequency for the SWR to be mea-
sured.
t
Push and hold [
(F-1)
10k
] one or more times to se-
lect the desired frequency pitch.
y
Push and hold [
(F-2)
] one or more times to select
the desired step.
u
After selecting the desired pitch and step, push
[
(F-3)
STR
] to measure the SWR.
• RTTY mode is selected automatically.
i
Push and hold [PTT] to display the SWR in a bar
graph readout.
o
When [PTT] is released, the frequency marker and
frequency indication move to the next frequency to
be measured.
!0
Repeat steps
i
and
o
to measure SWR over the
entire frequency range.
!1
When the measured SWR is less than 1.5, the an-
tenna is well matched.
G2 10k
STR
Frequency span
Step bar indication
Frequency indication mark
Measure start indicator
[DISPLAY]
[MENU]
[F-3]
[F-1]
[F-2]
CH
VFO A
SWR
S1
1 1.5 2
3
5
3
7
9
20
40 60dB
CW
BLANK
SWR
1 1.5 2
3
The best match is in this range.
∞
∞
M3 FIL NB
MET
[DISPLAY]
[MENU]
[F-3]
[MODE]
The antenna is well matched in this range
CH
VFO A
P
O
S1
5
5
3
7
9
20
40
10
60dB
BLANK
G2 50k
STR
4.0
3.5
3.0
2.5
2.0
1.5
1.0
RTTY
■
SWR
D
Measuring SWR
Span
Push [F-1] for 1 sec. to change the se-
lected span.
Step bar
Push [F-2] to change the step bar (3, 5,
7 or 9 steps are available.
Marker
Indicates the currently active step bar.
Start
Flashes while the SWR is being mea-
sured.