Yaesu FT-1000 Operating Manual page 13

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3. Controls & Connectors - Front Panel Controls
receiver AGC (off). Normally this switch is set to the
MED position. Strong signals will cause distortion if this
selector is set to OFF.
(5) FRONT END
Use this selector to set the optimum receiver front
end characteristics. The NOR position activates the inter-
nal rf amplifier, for maximum receiver sensitivity on a
quiet band. The IPO position bypasses the rf amplifier
and feeds the received signals directly to the first mixer.
The other positions insert 6-, 12- or 18-dB (1, 2 or 3
S-units) of attenuation before the mixer, to suppress
band noise and possible overload from very strong
signals. If the optional BPF-1 Bandpass Filter Unit is
installed, the functions of this selector, for the sub
receiver, may be controlled either in parallel with the
main receiver via this selector, or independently via the
selector on the BPF-1,
(6) RX MIX ~@> MONI
The inner RX MIX control adjusts the relative balance
of receiver audio between the two receiver channels
during dual reception.
The outer MONI control adjusts the audio volume of
the CW sidetone, and transmit RF monitor during
transmission, when activated by the gray button with
the same name.
(7) MIC ~®> RF PWR
The inner MIC control adjusts the microphone input
level for (non-processed) SSB and AM transmission.
The outer RF PWR control adjusts the transmitter
output power in all modes. The adjustment range is
from less than 20 to 200 watts, except in AM mode,
where it is from about 5 to 50 watts.
(8) PROC -@~ DRIVE
The inner PROC control sets the compression (input)
level of the transmitter RF speech processor in SSB
modes, when activated by the gray button with the
same name.
The outer DRIVE control sets the carrier level for CW
and AM transmission. Also, when the speech processor
is used in the SSB modes, this control sets the processor
level. In each case, the ALC function of the meter
should always be selected when setting this control, to
avoid overdriving the transmitter final amplifier.
(9) SQL -—®> NB
The inner SQL control sets the signal level threshold
at which receiver audio is muted (and the green BUSY
LEDs turn off), in all modes. This control is normally
kept fully CCW, except when scanning, and during FM
operation. Both main and sub receivers are affected.
The outer NB control adjusts the blanking level when
the noise blanker is activated during reception, for the
main receiver. If set very far clockwise, receiver audio
may be distorted.
(10) AF -<®> RF
The inner AF gain control adjusts the audio volume
of the receiver(s) in the speaker or headphones.
The outer RF gain control adjusts the receiver signal
level in front of the main receiver 1st mixer (via PIN
diodes), and also the gain of the main receiver IF
amplifiers. This control is normally set fully clockwise
for maximum sensitivity. When rotated counterclock-
wise from maximum, the S-meter minimum deflection
point will move up the scale. The peak deflection for a
particular signal will remain the same if it is greater
than the level set by this control, but the main receiver
will be insensitive to weaker signals. This control also
affects the SQL setting for the main receiver, and should
be preset fully clockwise when setting the squelch
threshold for vfo A or a recalled memory. This control
does not affect the sub receiver.
(11) MIC
This 8-pin jack accepts the MD-1pg or MD-Icg
Desktop Microphone or the MH-1 pg Handie Scanning
Microphone. MIC pinout is shown on page 7. Proper
microphone input impedance is 500 to 600 ohms.
(12) KEY
This 1/4-inch, -3-contact jack accepts a CW key or
keyer paddles (for the built-in electronic keyer), or
output from an external electronic keyer. You cannot
use a 2-contact plug in this jack, Pinout is shown on
page 7. Key up voltage is 5 V, and key down current is
0.5 mA. There is another jack with the same name,
connected in parallel with this jack, on the rear panel.
(13) PHONES
This 1/4-inch, 3-contact jack accepts either mon-
aural or stereo headphones with a 2- or 3-contact plug.
When a plug is inserted, the loudspeaker is disabled.
With stereo headphones such as the optional YH-77ST,
you can monitor both receiver channels at the same
time during dual reception. In this case, the PHONE
switch (page 17) in the top access panel selects mixed,
separate or monaural headphone operation.
(14) Push Switches
PROC
This gray button enables the RF speech processor
for SSB transmission. Processing level is set by the
control with the same name. While activated, the LED
above this button glows orange.
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