Transmitting; Operation; Ssb Operation - Icom IC-735 Instruction Manual

(1) USING THE PTT (PUSH-TO-TALK)
or
XMIT SWITCH
PTT SWITCH
XMIT
(2) USING VOX (VOICE OPERATED
TRANSMIT)
(3) CW BREAK-IN
CONTINUOUS TRANSMITTING
NOTE:
The fan never operates while in the
receive mode.
6 - 4 TRANSMITTING
Before transmitting, listen in the receive mode to make sure your
transmission will not interfere with other communications. Use a
dummy load instead of the antenna for preliminary transmitter
tuning.
Leave the other controls and switches in the same position as for the
receive mode. Push the PTT SWITCH on the microphone or the
XMIT SWITCH on the front panel, and the "XMIT" indicator
appears on the LCD. Speak into the microphone in a normal voice,
and note that the meter needle follows your voice modulation. This
indicates the SSB signal is transmitting. Set the MIC GAIN to keep
the ALC METER reading well within the designated ALC zone on
the meter at voice peaks. Adjust the RF POWER CONTROL to
obtain the desired power between approximately 10 and 100 watts.
Change back to the receive mode by releasing the PTT SWITCH or
by pushing the XMIT SWITCH again.
The VOX function allows hands-off transmissions since the trans-
mitter is turned ON and OFF by means of your voice. See page 30
for a full description of the VOX function.
When operating CW, the transmit/receive switching may be con-
trolled by the keying action rather than by manual operation by the
operator. See page 31 for a full description of CW break-in.
The IC-735 has a squirrel-cage fan installed on the PA unit for cool-
ing purposes. A protection circuit controls the fan operation such
that the fan supplies cool air at a low speed at the beginning of a
transmission. When the PA unit reaches a temperature of 50 ° C, the
fan motor increases to middle speed. A PA temperature of 90 ° C
causes the fan to run at the highest speed.
Under normal operating conditions, the IC-735 will continue to
transmit with no power reduction in an ambient temperature of
25° C even when transmitting for long periods.
6 - 5
6 - 5
OPERATION
- 1
SSB OPERATION
Set all controls and switches as described in Section 6 - 1.
(1) SSB RECEIVING
1. Push the POWER SWITCH IN.
2. Push the SSB SWITCH to select either USB or LSB mode.
USB
I
n
1331
C
t.i b u.s_t
VFO A
3. Push the HAM SWITCH and rotate the TUNING CONTROL to
select the desired band of operation.
Push the HAM SWITCH
again to place it in the OUT position and the HAM function is
disabled.
4. Adjust the AF GAIN CONTROL for the desired volume.
5. Rotate the TUNING CONTROL and search for a signal. Tune
across the signal to peak the meter needle while listening for the
most intelligible audio.