Se�ng Line Level Input into ACC Connector
When the AF-IN pin of the ACC interface is used for line input audio, you need
to set the appropriate input volume in the "AUX IN Volume" op�on in the
system menu. Set it at a mid-level value first. Then watch the TX power output
and adjust your incoming audio from the PC. (using the PC’s sound card output
volume level control). Remember that for digital data modes (e.g. FT8) you
want to set the radio at about 50% of full output so as not to overheat the
radio or distort the signal. With a good antenna, 10W average output is
sufficient for most digital mode communica�ons. Keep a check on the
temperature of the radio when you operate digital modes (and in general).
Your ambient temperature might be 55F (12C) or 105F(40C) and this has a
major effect on heat build-up. If the radio becomes very hot, you’ll need to
reduce power and give it �me to cool-down. The radio’s transmit sec�on is
very conserva�vely designed, but any radio can suffer from over-temperature
under certain challenging opera�ng condi�ons, such as the long 100% duty
cycle periods of some digital modes.
Automa�c Antenna Tuner
The G90/S has an efficient ATU to help you quickly match many kinds of
antennas effec�vely.
1. Press the [TUNE] bu�on in momentarily to bring the built-in antenna tuner
into circuit. An antenna icon will appear at the top of screen.
2. To ini�ate an antenna “tune”, hold the [TUNE] bu�on for > 2 sec.
NOTE:
Pressing the (TUNE) bu�on momentarily will show the antenna icon on the
screen. This indicates that antenna tuner in in-line. If you need to tell the
ATU to tune (new antenna, different frequency) hold the Tune bu�on in for
>2 sec.” Tuning” will be displayed.
A�er the antenna is “tuned” (actually it is matched to the radio rather than
“tuned”), leave the ATU ON so that it will provide the antenna match during
opera�on.
If the "SWR" icon is displayed at the top of the screen and flashes once while
transmi�ng – even a�er tuning, this indicates that the standing-wave of
current antenna is too high and while another tuning ac�on may be
a�empted, this could also indicate a faulty antenna.
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