Cw Operation - Icom IC-730 Instruction Manual

5 - 2 - 6 TRANSMITTING
Before transmitting, listen in the receive mode to make sure
your transmission will not interfere with other communi-
cations. If possible, use a dummy load for adjustment
instead of an antenna. Set knobs and switches as follows.
MIC GAIN
RF POWER CONTROL FULLY COUNTERCLOCKWISE
METER SWITCH
Other knobs and switches are left in the same positions as
for receiving. When the T/R switch is moved to transmit, or
when the PTT (push to talk) switch on the microphone is
depressed, the TRANSM IT Indicator is illuminated. By
speaking into the microphone, the meter needle will move
according to the strength of your voice and SSB signals will
be transmitted. Set the MIC GAIN control so that the meter
needle stays well within the ALC zone at voice peaks. If you
wish to increase the output power, turn the RF POWER
Control clockwise and adjust to obtain the desired RF output
power of between 10 watts and 100 watts (approximately).
Change to the receive mode by moving the T/R switch to
receive, or release the microphone PTT switch.
5 - 2 - 7
HOW TO USE THE SPEECH PROCESSOR
The I C-730 has a low distortion AF speech processor which
enables greater talk power and better results in DX opera-
tion. Follow the steps below for use of the Speech Pro-
cessor:
MIC GAIN CONTROL
RF POWER CONTROL
SPEECH PROCESSOR
(under access cover)
Switch to transmit and turn the RF POWER CONTROL
clockwise while speaking into the microphone until you
obtain the desired RF "PEAK" output power of between 10
watts and 100 watts (approximately).
Adjust the MIC GAIN CONTROL to a point where the RF
"AVERAGE" output power just saturates.
The Speech Processor should be turned OFF or MIC GAIN
CONTROL carefully set for minimum compression for all
communication other than DX operation for a very natural
voice quality.
5 - 2 - 8 HOW TO USE THE VOX CIRCUIT
The IC-730 has a built-in VOX (voice operated relay) which
allows automatic T/R switching by voice signals into the
microphone. For VOX use, set the knobs inside the top
access cover as follows:
VOX GAIN CONTROL
FULLY COUNTERCLOCKWISE
CENTE R (12 o'clock) position
ALC (IN)
Set to the CENTER
(12 o'clock) position.
Fully Counterclockwise
SWITCH
ON
ANTI VOX CONTROL
FULLY COUNTERCLOCKWISE
VOX DELAY CONTROL
FULLY CLOCKWISE
Push the VOX switch on the front panel to the ON (in)
position. Leaving the T/R switch in the RECEIVE position
and without pushing the PTT switch, turn the VOX GAIN
control clockwise while speaking into the microphone. At a
certain point, the T/R switching circuit will be activated by
your voice. This is the proper position for the VOX GAIN
control. Set the VOX GAIN control at a level which provides
for T/R switching at your normal voice level. Transmit-
release time (the time delay before the set automatically
returns to receive when you stop talking) is controlled by
the VOX DELAY control. Turning the control
counterclockwise makes the time shorter. Set it at a
position which is comfortable and which allows for short
pauses in normal speech.
Adjust the ANTI VOX control so that the VOX circuit is not
activated by sounds from the speaker by turning the control
clockwise while receiving a signal.
5 - 3

CW OPERATION

5 - 3 - 1 RECEIVING
For CW reception, set the MODE Switch for CW mode, or
CW-N mode.
Other switches and knobs are set the same as for SSB
reception.
In addition to the crystal band-pass filter, a Narrow filter
(FL-45) and the AF band-pass filter (IC-EX203) are option-
al for this unit. When the MODE Switch is set at the CW-N
mode, this filter is activated and the total selectivity of CW
reception is improved (500Hz/-6dB). Also, the AF filter
improves 150Hz/-6dB selectivity. With these filter, internal
noise is reduced for comfortable CW reception and an im-
proved signal to noise ratio (S/N).
If the optional CW filter is not installed the CW-N mode will
have the same selectivity as the CW mode.
The Pass Band Tuning system can be used to narrow the
band width up to 800Hz, the same as in the SSB mode.
Also, use the Noise Blanker, AGC switch and/or PREAMP
Switch depending on the receiving conditions, the same as
SSB reception.
5 - 3 - 2 TRANSMITTING
Insert the keyer plug into the KEY Jack on the rear panel of
the unit, and set knobs and switches as follows:
RF POWER CONTROL
METER SWITCH
Other knobs and switches are set the same as for CW
-- 15 --
Fully counterclockwise
RF (OUT) POSITION