Icom IC-775DSP Instruction Manual page 5

© VOX/SEMI BREAK-IN DELAY CONTROL
[DELAY] (p. 36) 7
Adjusts the transmit-to-receive switching delay
time for VOX and CW semi break-in operations.
DELAY
(EI
@ NOISE BLANKER SWITCH [NB] (p. 30)
Turns the noise blanker ON and OFF.
NB , NB
E] ofr ia] on
FUNCTION
The noise blanker reduces pulse-type noise such as
that generated by automobile ignition systems. This
function in not effective for AM and FM, or non-
pulse-type noise. i
Long delay for
low speed keying
Short delay for
high speed keying
@ NOISE BLANKER LEVEL CONTROL
_ [NB LEVEL] (p. 30)
Adjusts the noise blanker threshold level.
| NB LEVEL
Decreases f OF Increases
@ NOISE BLANKER WIDE SWITCH [NB WIDE]
(p. 30)
Selects the blanking time of the noise blanker
circuit for a normal.or wide blank width.
- This switch can be assigned to the noise reduction
on/off switch in P-set mode. (p. 43)
NB WIDE NB WIDE
Zen OFF (normal) Cs: ON (wide)
FUNCTION
The wide blank width effectively reduces wide pulse-
type noise known as "woodpecker" noise and key clicks
from strong CW signals on nearby frequencies.
OD BLANK WIDTH CONTROL [BLK-WIDTH] (p. 30)
Adjusts the blank width of the wide noise blanker
circuit. To suppress echo noise from woodpecker
signals, etc., rotate [BLK-WIDTH] clockwise. The
setting is effective when [NB WIDE] is ON.
NOTE: When [BLK-WIDTH] is turned too far
clockwise, receive audio is also blanked. WS
BLK-WIDTH
Narrow / OP Wide
PANEL DESCRIPTION 1
@ S/RF METER (p. 36)
Shows the signal strength while receiving. For
transmit meter readings, see the following table.
© METER SWITCH [METER] (p. 36)
Selects the S/RF meter functions during trans-
mission as follows: l
Indicates the SWR over the
transmission line. l
| Indicates the ALC level. The ALC
circuit begins to activate when the RF
output power reaches a preset level.
Indicates the compression level when
the speech compressor is in use.
Indicates the drain's terminal voltage of
. the final FET.
@ ANTENNA SWITCHES [ANT1]/[ANT2] (p. 45)
Select antenna 1 or 2.
- Antenna selection can be programmed depending on
the band selection such as above the 21 MHz band
and below the 18 MHz band, etc.
PREAMP/ATTENUATOR SWITCH
[PREAMP/ATT]
Selects one of 2 receive RF preamps, one of 6
dB, 12 dB or 18 dB attenuators, or bypasses
them. | . .
- [PRE1] activates the 10 dB preamp for HF all bands.
- [PRE2] activates the 16 dB high-gain preamp for 21
MHz band and above. )
FUNCTION
The preamp amplifies received signals in the front end
circuit to improve the S/N ratio and sensitivity. Set this
switch to [PRE1] or [PRE2] when receiving weak signals.
The attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequency
or when very strong electric fields, such as from a
broadcasting station, are near your location. `
@ ANTENNA TUNER SWITCH [TUNER] (p. 39)
e Turns the antenna tuner ON or OFF (bypass)
when pushed momentarily.
e Starts to tune the antenna tuner manually when
pushed for 2 sec.
- When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.