54
Listening to Signals Below 1 MHz
Signals below about 1 MHz will be attenuated when the receiver is
using the transmit antenna path (i.e., when the RX antenna is set to
the "=TX" setting, or to an ATU antenna also being used by the
transmitter). This is due to the high-pass filter incorporated in the T/R
switch, which protects the PIN diodes. To listen to signals below 1 MHz
without attenuation, use a separate receive antenna connected to RX
ANT 1 IN or XVTR IN/RX ANT 2 IN, or select an ATU antenna that is not
in use by the transmitter. (The current transmit antenna is indicated
by its icon, as well as an orange dot in the RX antenna button group.)
OPERATING MODES
This section discusses basic setup procedures for each of the operating
modes.
The {XMTR} and {FILTER} multi-function knobs are used to adjust
frequently changed parameters such as mic gain or CW code speed,
while the <MAIN RX>, <SUB RX>, and <TX> primary function buttons
on the LCD are used to do per-mode configuration.
You can select the desired mode for a given VFO in one of two ways:
• tap the mode icon adjacent to its numeric display
• tap the [MODE] switch (above the VFO A knob). This normally selects
the mode for VFO A; tap [B SET] first to select the mode for VFO B.
Either method brings up the mode button group.
Most modes also have an alternate setting, selected by tapping the
target mode's button a second time. For example, tapping <CW> a
second time switches to <CW-R> (CW reverse). Tapping <LSB>
switches to <USB> and vice-versa. Alternate modes can also be
selected using [ALT], the hold function of [MODE].
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