Using The Internal Antenna Tuner; D Manual Tuning; D Ptt Tuner Start; About An External Antenna Tuner - Icom IC-7610 Basic Manual

Using the Internal antenna tuner

1. Push to turn ON the internal antenna
TUNER
tuner.
• The indicator on the
TUNER
2. Tune the antenna.
L To tune the antenna, see "Manual tuning" or "PTT
Tuner start" below.

D Manual tuning

You can manually tune the antenna before
transmitting for the first time.
1. Hold down for 1 second to start manual
TUNER
tuning.
• The tuning normally takes 2~3 seconds.
• The indicator on the
TUNER
2. After tuning, the indicator on the
white, and the internal antenna tuner stays ON.
L If the tuner cannot tune, the indicator on the
key goes out, and the tuning circuit is automatically
bypassed.

D PTT Tuner start

The tuner is always activated when [PTT] is pushed
after the frequency is changed (more than 1% from
the last-tuned frequency). This function tunes the
antenna for the first transmission on a new frequency.
L This function can be turned ON in the "PTT Start"
item on the TUNER screen.
» SET > Function > Tuner > PTT Start
MENU
NOTE:
If the SWR is higher than about 1.5:1 when tuning more
than 100 kHz on an antenna's preset point, hold down
for 1 second to start manual tuning.
TUNER
If the tuner cannot tune the antenna
• Repeat manual tuning several times.
• Even if the tuner cannot tune the antenna on the first
tuning, it may success at the second tuning.
• Some antennas, especially for the low bands, have a
narrow bandwidth. These antennas may not tune at
the edge of their bandwidth, therefore, tune such an
antenna as follows:
(Example):
Suppose you have an antenna which has an SWR of 1.5:1
at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.
1. Set 3.55 MHz, and hold down
second to start manual tuning.
2. Set 3.80 MHz, and hold down
second to start manual tuning.
key lights.
key blinks red.
key lights
TUNER
TUNER
(p. 8-3)
for 1
TUNER
for 1
TUNER
ANTENNA TUNER OPERATION

About an external antenna tuner

The optional AH-4
antenna tuner
IC-7610 to a long wire antenna more than 7 m/23 ft
long (3.5 MHz and above).
In addition, using the optional AH-2b
matches the IC-7610 to a whip antenna more
element
than 2.5 m/8.2 ft long (7
The optional AH-740
covers 2.5 to 30 MHz range with the whip antenna that
is supplied with the AH-740.
R DANGER HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting. Always install it in a secure place.
NEVER operate the AH-4 or AH-740 without an antenna
connected. The tuner and transceiver will be damaged.

D Using the AH-4 or AH-740

1. Turn ON the transceiver.
• "TUNE" is displayed.
L Each time you push
turned ON (the indicator on the
OFF (bypassed).
2. Hold down
TUNER
tuning.
• The tuner reduces the SWR to less than 2:1 after 2~3
seconds of tuning.
L While tuning, a side tone is heard and the indicator on
the key blinks red.
TUNER
L If the tuner cannot reduce the SWR to less than 2:1
after 15 seconds of tuning, the indicator goes out.
3. After tuning, the indicator stops blinking and lights
white.
L When the long wire antenna cannot be tuned, the
indicator goes out. In that case, the AH-4 is bypassed
and the wire is directly connected.
NOTE: When the wire antenna cannot be tuned, check the
wire length and connection.
Note that the AH-4 cannot tune a wire that is a ½λ long or
on a multiple of that frequency.
7-3
matches the
antenna
50 MHz).
~
automatic tuning antenna
,
the AH-4 or AH-740 is
TUNER
key lights) or
TUNER
for 1 second to start manual
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