Icom IC-730 Maintenance Manual page 6

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In the transmit mode the meter has two functions which
are selected by the Meter Switch (18). They are as follows:
Po; Indicates the relative output power. SWR can be
measured by placing the switch located inside the top cover
to the SWR position.
ALC; In this position the meter functions when the RF
output reaches a certain level.
18. METER SWITCH
Selects meter function in the transmit mode.
19. TRANSMIT INDICATOR
Illuminates when the transceiver is in the transmit mode.
20. FREQUENCY DISPLAY
The frequency of the IC-730 is displayed on a luminescent
display tube. Since the 1 MHz and 1 KHz decimal points are
displayed, the frequency can easily be read. The frequencies
indicated are the carrier frequencies of each mode in AM,
USB, LSB and CW.
Remember, if you turn the R IT SWITCH ON to change the
receive frequency and rotate the RIT CONTROL knob, the
frequency displayed will not change.
21. NORMAL/SPLIT (TRANSCEIVE/SPLIT) SWITCH
Selects the relationship of the two VFO's. In the NORM
(out) position, one VFO is for both transmit and receive.
In the SPT (in) position, one VFO is for transmit and
the other is for receive.
22. VFO SWITCH
You can select either of the built-in two VFO's with this
switch. It also selects the relationship of the two VFO's
with the NORMAL/SPLIT switch. The switch performs the
following operations according to its position.
A. (NORMAL) Selects the "A" VFO for both transmit and
receive.
A. (SPLIT) Selects "A" VFO for receive and "B" VFO
for transmit.
B. (NORMAL) Selects the "B" VFO in both transmit and
receive.
B. (SPLIT)
Selects "B" VFO for receive and "A" VFO
for transmit.
23. TUNING RATE SWITCHES
The small vernier marks on the tuning knob are changed to
correspond to 10Hz, 100Hz or 1KHz steps which is selected
by pushing the switch either 10Hz, 100Hz or 1 KHz.
2-3
24. DIAL LOCK SWITCH
After the IC-730 is set to a certain frequency for rag
chewing, mobile operation, etc., push the DIAL LOCK
switch the VFO is electronically locked at the displayed
frequency, thus inactivating the operation of the tuning
knob. To change frequency, the dial lock must first be
disengaged by pushing and releasing the DIAL LOCK switch
again.
25. RIT SWITCH
Switches the RIT circuit ON and OFF.
26. RIT CONTROL
Shifts the receive frequency ±800Hz either side of the trans-
mit frequency. When the RIT is ON, the RIT INDICATOR
is illuminated. Rotating the control to the
(+)
side raises
the receive frequency, and rotating to the (-) side lowers
the receive frequency. The frequency shifted by turning
the RIT Control is not indicated on the frequency display.
27. RIT INDICATOR
Illuminates when R IT is turned ON.
28. BAND SWITCH
The BAND SWITCH is an 11 position rotary switch used for
selecting one of the 500KHz segments. The selectable bands
are 3.5KHz, 7MHz, 10MHz, 14MHz, 18MHz, 21 MHz,
24MHz and 28MHz. (28MHz band is separated to four
500KHz segments.)
29. PASS-BAND SHIFT (TUNING) CONTROL
Allows continuous shifting of the pass-band from upper or
lower side in SSB and CWo This will reduce interference by
a nearby signal. When the optional crystal filter F L-3O is
installed, this control allows continuous tuning of the
pass-band selectivity by moving the filter up to 800Hz from
the upper or lower side in SSB and CWo Not only improves
selectivity, but also can improve the audio tone. Normal
position is in the center position and is 2.4KHz wide in
SSB.
CONTROLS UNDER THE ACCESS COVER
30. SPEECH PROCESSOR SWITCH
Switches the speech processor circuit ON and OFF. This
circuit enables greater talk power and better results in D X
operation.
31. SWR SWITCH
When measuring SWR, calibration SET and SWR reading
functions are selected with this switch. When reading SWR
make sure the METER switch on the front panel is in the
R F position.
32. SWR SET CONTROL
This control calibrates the meter needle to the SWR SET
position when you want to determine the value of SWR.
The METER switch must be in the RF position and the set
must be transmitting a carrier.
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