Icom IC -765 Instruction Manual page 27

ELECTRONIC KEYER SPEED CONTROL AND
SWITCH (p. 26)
Changes keying speed when operating in CW mode
with the built-in electronic keyer. Use this control
with the [FAST/SLOW] switch.
VOX DELAY CONTROL AND VOX SWITCH
(p. 32)
Provides VOX operation. The [VOX] control can
change the switching time of transmit to receive
during pauses in your speech or CW transmission.
FULL BREAK-IN SWITCH (p. 26)
Provides full break-in CW operation.
switch must be pushed IN.
The [VOX]
SELECT —— SCAN
IF SHIFT CW 250Hz NOTCH
IF SHIFT
` ШЕ. 7 ` d. 7
LEAR M* VFO WRITE
MEMORY-CH
RF POWER CONTROL
for the desired output power level.
МІС TONE CONTROL |
Adjusts the transmit sound quality.
Tech Talk from Icom
Q: What is ALC?
A: ALC means Automatic Level Control. The ALC
circuit limits output power by controlling the
input level of the RF power amplifier.
The RF power amplifier is designed as a linear
amplifier to amplify an input signal proportionally.
The linear amplifier functions in the linear area of
SPLIT SWITCH (р. 34)
Provides transmit on one frequency and receive on
another.
ATX SWITCH AND CONTROL (p. 35)
Fine tunes stations which call off frequency or
compensates for frequency drift. Shifts transmit
frequency without shifting the receive frequency
when the [ATX] switch is pushed.
Maximum output power
Changes the RF output power. Adjust this control - SSB
- CW, FM, RTTY : 100W
- AM
PRE-OPERATION 5
100 W PEP
40 W
the signal. However, if the input signal level exceeds
the limit of linearity, the linear amplifier outputs
distorted signals because the signal is amplified ina
non-linear area of the signal.
To prevent transmitting distorted signals, the ALC
circuit detects a signal and applies it to a driver
amplifier as feedback to reduce driver output power.
Therefore, the input signal level to the RF power
amplifier is reduced and the transceiver transmits
clear signals.