Icom IC-730 Instruction Manual page 9

6. RF POWER CONTROL
Controls the RF output power 10 Watts to maximum (SSB:
100 Watts PEP, CW: 100 Watts, AM: 40 Watts). Clockwise
rotation increases the output power.
7. AF GAIN CONTROL
Controls the audio output level in the receive mode. Clock-
wise rotation increases the level.
8. RF GAIN CONTROL
Controls the gain of the RF section in the receive mode.
Clockwise rotation gives the maximum gain. As the control
is rotated counterclockwise, the need le of the METER rises,
and only signals stronger than the level indicated by the
needle will be heard.
9. T/R (TRANSMIT/RECEIVE) SWITCH
This switch is for manually switching from transmit to
receive and vice versa. Set the switch to RECEIVE (out)
and the IC-730 is in the receive mode. Set the switch to
TRANSMIT (in) and it switches to transmit. When switch-
ing with the PTT switch on the microphone or with the
VOX switch set to ON, the T/R switch must be in the
RECEIVE position.
10. VOX SWITCH
This switches the VOX circuit ON and OF F. When it is in
the ON (in) position, in SSB, T/R switching is accomplished
by means of a voice signal. In CW operation, semi-break-in
switching by means of keying is possible.
11. NB (NOISE BLANKER) SWITCH
When pulse type noise such as automobile ignition noise is
present, set this switch to the ON (in) position. The noise
will be reduced to provide comfortable reception.
The blanking time can be selected NARROW and WIDE,
by the NB WIDTH switch under the access cover. It will be
effective against any type noises.
12. AGC (AUTOMATIC GAIN CONTROL) SWITCH
For changing the time-constant of the AGC circuit. With
the switch in the AGC position (out) the AGC voltage is
released slowly, and thus is suitable for SSB reception.
With the switch in the FAST (in) position, the AGC voltage
is released faster, and the AGC is suitable for stations suffer-
ing from fast fading or when operating in the CW mode.
13. PREAMP SWITCH
Switches the preamplifier for the receiver.
14. MEMORY/VFO WRITE BUTTON
By pushing this button, A VFO's frequency is written into
Memory, or one VFO's frequency is transferred to the other
VFO.
15. MEMORY SWITCH
Push this switch when you wish to write a frequency into
memory, or to call a memorized frequency.
B. (NORMAL) Selects the "B" VFO in both transmit and
receive.
16. TUNING CONTROL KNOB
Rotating the TUNING CONTROL KNOB clockwise in-
creases the frequency, while rotating it counterclockwise
decreases the frequency. The frequency is changed in 10Hz,
100Hz or 1KHz steps which is according to the TUNING
RATE switches. One complete rotation of the tuning knob
results in a 1K Hz frequency increase or decrease in 10Hz
steps, 10KHz in 100Hz steps and 100KHz in 1KHz steps.
17. METER
When in the receive mode the meter acts as an S meter
regardless of the position of the meter select switch. Signal
strength is indicated on a scale of S1-S9, and S9 to
S9 + 60dB.
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; I n 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. FREOUENCY DISPLAY
The frequency of the IC-730 is displayed on a luminescent
display tube. Since the 1MHz and 1KHz 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 RIT SWITCH ON to change the
receive frequency and rotate the RIT CONTR OL 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 V FO's with
the NORMAL/SPLIT switch. The switch performs the
following operations according to its position.
A. (NORMAL) Selects the "A" V FO for both transmit and
receive.
A. (SPLIT) Selects "A" V FO for receive and "B" V FO
for transmit.
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