(4) PHONES Jack
A 1/4-inch, 3-contact jack accepts either
monaural or stereo headphones with 2- or
3-contact plugs. When a plug is inserted, the
loudspeaker is disabled.
NOTE
When wearing headphones, we recommend that you turn the AF Gain levels down to their lowest settings before turning power on, to minimize the impact on your hearing caused by audio "pops" during switch on.
(5) MIC Jack
This 8-pin jack accepts input from a
microphone utilizing a traditional YAESU
HF transceiver pinout.
(6) [ANT] Switch
Prsssing this switch selects the ANT 1 or the
ANT 2 connector on the rear panel, and
allows convenient antenna switching, at the
press of a button. The selected antenna jack
is indicated on the Key Function Display
shown in the TFT Display.
ADVICE:
The ANT2 jack may be enabled to use a receive only antenna, using the Menu item "033 ANT2 SETTING". See page 114.
(7) [IPO] (INTERCEPT POINT OPTIMIZATION) Switch
This button may be used to set the optimum front end
characteristics of the receiver circuit for a very strong
signal environment. Available selections are AMP 1
(low distortion amplifier), AMP 2 (2-stage low-
distortion RF amplifier), or IPO (bypasses the front
end amplifier). The selected receiver RF appears in
the IPO column of the Key Fundtion display.
(8) [ATT] Switch
This button selects the degree of attenuation, if any,
to be applied to the receiver input.
Available selections are -6 dB, -12 dB, -18 dB, or
OFF. The attenuation level appears in the ATT
column of the Key Funtion Display on the display.
ADVICE:
The Attenuator may be used in conjunction with the [IPO] button to provied additional signal reduction when an extremely strong signal is being received.
(9) [R. FLT] (ROOFING FILTER)
Switch
This button selects the bandwidth of the receiver first
IF Roofing Filter. Available selections are 3 kHz, 6
kHz, 15 kHz, or Auto.
The selected bandwidth appears in the R.FLT column
of the Key Function Display on the display.
ADVICE:
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(10) [N.B.] Switch
This button turns the IF Noise Blanker on
and off.
Press this button momentarily to reduce
short-duration pulse noise.
Available selections ar ON, OFF, or NBW
ON. The attenuation level appears in the NB
column of the Key Function Display on the
display.
(11) [AGC] Switch
This button selects the AGC characteristics
for the receiver. Available selections are
FAST, MID, SLOW and OFF, or AUTO.
The selected AGC characteristic appears in
the AGC column of the Key Function
Display on the TFT display.
Press the [AGC] button repeatedly to select
the desired receiver-recovery time constant.
Press and hold in the [AGC] button for one
second to disable the AGC (for testing or
week-signal reception).
ADVICE:
(12) [MOX] Switch
Pressing this button engages the PTT (Push
to Talk) circuit to activate the transmitter (an
icon in the LED indicators area illuminates
and the "MOX" icon will appear in the TFT
Display). It must be turned off (the icons
will disappear) for reception. This button
replicates the action of the Push to Talk
(PTT) switch on the microphone. When
engagine the "MOX" button, or otherwise
causing a transmission to be started, be
certain you have either an antenna or 50-
Ohm dummy load connected to the selected
Antenna jack.
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