Icom IC-821H Instruction Manual page 24

4 RECEIVE AND TRANSMIT
Mi Functions for receive
© Squelch setting
21
The squelch removes noise output from the speaker
(closed condition) when no signal is received. The
squelch is particularly effective for FM. It is also
available for other modes.
e When operating in FM
@ Rotate [SQL] fully counterclockwise.
© Rotate [SQL] clockwise to the point where the
noise just disappears.
The squelch does not open for weak signals
, when it is set too deep (clockwise).
© Frequency check
The frequency check function opens the squelch
and monitors the frequency to be transmitted without
changing the squelch setting level.
This function is useful while operating in FM mode,
operating through a repeater (p. 31) or operating
with the split function (p. 26).
© RIT function
The RIT (Receive Incremental Tuning) function
compensates for off-frequencies of communicating
stations. The function shifts the receive frequency
up to +1.0 kHz in 10 Hz steps in SSB/CW mode
(+5.0 kHz in 50 Hz steps in FM mode) without
moving the transmit frequency.
The RIT function can be used for the main band
only.. The function affects to the main band even
when accessing the sub band.
e When operating in SSB or CW
@ Rotate [SQL] fully counterclockwise.
- The squelch opens. Under normal conditions, oper-
ate the transceiver in this position.
@ Rotate [SQL] clockwise when you want to elimi-
nate the floor noise if desired.
The SSB threshold point can be set to the 9 or 12
o'clock position in set mode with the [CHECK]
switch. When setting to the 12 o'clock position,
the signal strength to open the squelch is nearly
equal for FM and SSB/CW modes. (p. 45)
[CHECK]
@ Push the [RIT] switch to activate the function.
- "RIT" appears.
"RIT" appears.
(2) Rotate the [RIT] control to cancel the off-
frequencies.
- The transmit frequency is not shifted.
(3) To cancel the RIT function, push [RIT] again.
- "RIT" disappears.