Vox Operation - Icom IC-78 Instruction Manual

ï Microphone compressor
IC-78 has a built-in, low distortion Mic compressor
circuit. This circuit increases your average talk power
in SSB mode and is especially useful when the re-
ceiving station is having difficulty copying your signal.
q Select USB or LSB mode.
w Push [COMP] switch to turn mic compressor ON.
• "COM" indicator appears.
ï VOX operation
The VOX (Voice-operated Transmission) function
switches between transmit and receive with your
voice. This function provides an opportunity to input
log entries into your computer, etc. while operating.
q Select "VOX" in quick set mode .
• Push [SET] for 1 sec. to select quick set mode .
• Push [∫ UP]/[√ DN] to select "VOX".
w Rotate the channel selector to turn VOX function
ON.
[COMP] switch
Appears when
mic compressor
is activated.
Rotate the
channel selector
OFF ON
e Confirm the ALC level.
• Push [SET] to select the ALC meter.
• Speak into the microphone at a normal voice level.
• If the ALC meter peak past the ALC zone, re-adjust the
mic. gain. (p.16)
• Be sure the mic gain is in the range of 20 to 50.
ALC zone
Adjust [MIC GAIN] so that the ALC
meter reads within the ALC zone.
Note: When the ALC meter peaks above the ALC
zone, your transmitted voice may be distorted.
e Select "VOX GAIN" in quick set mode .
• Push [∫ UP]/[√ DN] to select "VOX".
r While speaking into the microphone, adjust [VOX
GAIN] with the channel selector, until the trans-
ceiver is transmitting.
t Select "VOX DELY" in quick set mode .
• Push [∫ UP]/[√ DN] to select "VOX Delay"
t While speaking into the microphone, adjust [VOX
DELY] as desired.
y Select "ANTI-VOX" in quick set mode .
• Push [∫ UP]/[√ DN] one or more times to select "AN
VOX"
u If the receive audio from the speaker switches the
transceiver to transmit during receive, adjust the
"ANTI-VOX" to the point where it has no effect.
i Push [SET] to exit quick set mode .
4
OPERATION
17