Icom IC-R75, Инструкция по эксплуатации

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5
14
RECEIVE FUNCTIONS
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Mode selection
The following modes are available in the IC-R75:
SSB (LSB/USB), CW, CW REV (CW reverse), FM,
AM, S-AM (Synchronous detection AM), RTTY and
RTTY REV (RTTY reverse).
➥
Push [SSB] to toggle between LSB and USB.
➥
Push [CW/RTTY] momentarily to toggle between
CW and RTTY.
➥
Push [CW/RTTY] for 2 sec. to toggle between CW
and CW reverse or RTTY and RTTY reverse.
➥
Push [AM] to toggle between AM and S-AM.
• “S-” blinks when automatic mode selection between
S-AM and AM modes is in use. This can be set in set
mode. (p. 31)
➥
Push [FM] to select FM.
The selected mode is indicated in the function dis-
play.
OPERATING MODE SELECTION
SSB
AM
Push momentarily
FM
CW/RTTY
CW CW REV RTTY RTTY REV
AM
Push mode switch
for 2 sec. Push mode switch
momentarily.
S-AM
FM
LSB USB
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Squelch and RF gain
The receiver uses the same control, [RF/SQL], to ad-
just one of either the RF gain or the squelch.
[RF/SQL] adjusts either the RF gain or the squelch
depending on the operating mode selected and the
condition of the RF/SQL item in set mode (p. 30).
• [RF/SQL] control priority
* The RF gain is set to maximum level when the [RF/SQL]
is set as [SQL] control.
The RF (Radio Frequency) gain is used to adjust the
receiver gain.
• Shallow rotation moves the S-meter to the right indicating
the signal strength which can be received.
The recommended position for RF gain is the 12
o’clock position since this sets RF gain to the max.
The SQUELCH removes noise output from the
speaker (closed condition) when no signal is re-
ceived. The squelch is particularly effective for FM. It
is also available for the other modes.
• When operating in FM, first rotate the control fully counter-
clockwise. Then, rotate the control clockwise to the point
where the noise just disappears. This is the best position.
The squelch does not open for weak signals when it is set
too deep.
• A segment appears in the S-meter to indicate the S-meter
squelch level.
• When set as the [RF/SQL] control
Set mode
setting
USB, LSB,
CW, RTTY
AM, S-AM, FM
Sq (SQL) SQL* SQL*
At (AUTO) RF GAIN SQL*
rS (RF/SQL) RF/SQL RF/SQL
Recommended level
Minimum RF gain
Adjustable range
RF gain adjustable
range
Maximum RF gain
Maximum RF gain
Squelch is open.
S-meter squelch
S-meter squelch
threshold
Noise squelch threshold
(FM mode)
Shallow Deep
Squelch is open.
S-meter squelch
Noise squelch (FM mode)
Noise squelch (FM mode)
• When set as the [SQL] control
• When set as the [RF] control