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Note:
X The APO function works even if the transceiver is scanning.
X The APO timer starts counting down when no key presses,
no control adjustments, and no command (COM connector)
sequences are detected.
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As explained in “ANTENNA CONNECTION”
{page 1}, matching the impedance of the coaxial cable
and antenna is important. To adjust the impedance
between the antenna and the transceiver, you have
the choice of using the internal antenna tuner or an
external antenna tuner. This section describes how
to use the internal antenna tuner. For the external
antenna tuner, consult the instruction manual that
comes with the tuner.
1 Select the transmit frequency.
2 Press and hold [PRE (ANT 1/2)] to select “ ”
or “
”.
• If the external antenna tuner (AT-300) is
connected to the ANT 1 connector, select
ANT 2 to use the internal antenna tuner.
The internal antenna tuner is automatically
bypassed if the external antenna tuner is
connected to ANT 1.
3 Press and hold [AT (TUNE)].
• CW mode is automatically selected and tuning
begins.
• “ ” blinks and the TX-RX LED lights red.
• To cancel tuning, press [AT (TUNE)] again.
• If the SWR of the antenna system is extremely
high (more than 10:1), an alarm (“SWR” in
Morse code) sounds and the internal antenna
tuner is bypassed. Before attempting to tune
again, adjust the antenna system to lower the
SWR.
4 Monitor the display and check that tuning has
successfully finished.
• If the tuning was successful, “
” stops
blinking and the red TX-RX LED turns OFF.
• If tuning does not finish within approximately
20 seconds, an alarm (“5” in Morse code)
sounds. Press [AT (TUNE)] to stop the alarm
and tuning.
• If you want the transceiver to stay in
transmission mode after the tuning completes,
access Menu No. 51 and select “on”.
• To pass received signals through the internal
antenna tuner, access Menu No. 52 and select
“on”. When this function is ON, “
” appears.
This may reduce interference on the receive
frequency.
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Two antenna connectors are available for the HF/
50 MHz band on the TX/ RX unit rear panel.
Press and hold [PRE (ANT 1/2)] to select ANT 1 or
ANT 2.
• “
”or“ ” appears to indicate which
antenna is selected.
5;$17
Press and hold [ATT (RX ANT)] to toggle the RX ANT
between enabled and disabled.
• “
” appears when the RX ANT is enabled.
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Press and hold [METER (DRV)] to switch the DRV
between enabled and disabled.
Use the standard input of 1 mW for the linear amplifier
and other connections.
• “
” appears when the DRV is enabled
The ANT 1, ANT 2, RX ANT, and DRV settings will
automatically be stored in the antenna band memory.
The next time you select the same band, the same
antenna will be automatically selected.
Antenna Selection Frequency Range (MHz)
0.03 ~ 0.522 10.5 ~ 14.5
0.522 ~ 2.5 14.5 ~ 18.5
2.5 ~ 4.1 18.5 ~ 21.5
4.1 ~ 6.9 21.5 ~ 25.5
6.9 ~ 7.5 25.5 ~ 30.0
7.5 ~ 10.5 30.0 ~ 60.0
Note:
X Connect an external tuner to the ANT 1 connector only,
then select ANT 1. The internal antenna tuner will be
automatically bypassed when the transceiver is switched
ON.
X The RX ANT can be used with less than 30 MHz.
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You can set the transceiver to switch OFF
automatically if no keys or controls are pressed or
adjusted for a certain period of time. One minute
before the transceiver switches OFF, “CHECK” is
output in Morse code.
1 Press [MENU], then press [Q-M.IN]/ [Q-MR] or
turn the MULTI/CH control to access Menu No. 78.
2 Press [M.IN]/ [SCAN (SG.SEL)] to select the APO
time from “oFF”, “60”, “120”, or “180” minutes.
3 Press [MENU] to exit Menu mode.