Icom IC-735 Instruction Manual page 13

2
PASSBAND TUNING CONTROL
This control allows continuous tuning of the passband selectivity by
moving the filter center frequency as much as 1.8kHz either side of
the receive frequency in the SSB or CW modes. This feature not
only improves the selectivity, but it can also improve the audio tone.
The normal control position is at the center (12 o'clock), which
provides a filter bandwidth of 2.4kHz in the SSB mode. See page38
for a more detailed explanation.
0 NOTCH FILTER SWITCH
This switch turns the NOTCH FILTER circuit ON and OFF.
0 NOTCH FILTER CONTROL
0 T/R (TRANSMIT/RECEIVE) SWITCH
C) PHONES JACK
MIC CONNECTOR
This control shifts the NOTCH FILTER frequency. Adjust the
control to reduce or eliminate interfering signals. See page 38 for a
more detailed explanation.
This switch is for manually switching from transmit to receive and
vice versa. Set the switch to RECEIVE(out) and the IC-735 is in the
receive mode. Set the switch to TRANSMIT(in) and the transceiver
switches to transmit. When using the PTT switch on the microphone
or the VOX system, the T/R SWITCH must be in the RECEIVE
position.
This jack accepts a standard 1/4 inch headphone plug from head-
phones with an impedance of 4 — 16 ohms. Stereo headphones may
be used without modification.
Connect a suitable microphone to this jack. The supplied IC-HM12
hand microphone or the optional SM-8 desk microphone may be
used. For different microphones, refer to the diagrams on page 16.
FRONT VIEW
® AF OUTPUT
EDMIC INPUT
C2 +8VDC OUTPUT
© F REQ UP/DOWN
TGND
(microphone ground)
EDGND (PTT ground)
® PTT
®NC
a
NOISE BLANKER (NB) SWITCH
© ATT (ATTENUATOR) SWITCH
PREAMP SWITCH
Push this switch IN to reduce pulse noise such as that generated by
automobile ignition systems. The blanker circuit reduces back-
ground receive noise for more enjoyable operating. Additionally,
the NB LEVEL CONTROL varies the noise blanker threshold level
when the switch is IN.
Push this switch IN to remove the RF amplifier from the receive
path when strong signals interfere with reception, or make "S"
meter readings difficult. For normal operation, leave the switch
OUT.
This switch turns the receiver preamplifier ON and OFF. Push the
switch IN to insert the 10dB preamplifier in the receive path when
using a small antenna or receiving a weak signal for added sensitivity.
The preamp circuit works at frequencies higher than 1.6MHz.