Icom Understanding the Basic Operations of the Marine Radio IC-7000

3BASIC OPERATION

■Squelch and receive (RF) sensitivity

Adjusts the RF gain and squelch threshold level. The	[RF/SQL]
squelch removes noise output from the speaker
(closed position) when no signal is received.

•The squelch is particularly effective for FM. It is also avail- able for other modes.

•The 12 to 1 o’clock position is recommended for any set- ting of the [RF/SQL] control.

•The control can be set as ‘Auto’ (RF gain control in SSB, CW and RTTY; squelch control in AM, FM and WFM (RF gain is fixed at maximum) in the miscellaneous (others) set mode as follows (p. 131).

SETTING	OPERATION
	Can be used in all modes.
RF+SQL	Functions as noise squelch or S-meter
(default)	squelch in AM, FM and WFM modes;
	S-meter squelch only in other modes.
SQL	Operates as a squelch control.
	•RF gain is fixed at maximum sensitivity.
	Operates as an RF gain control in
AUTO	SSB, CW and RTTY modes.
	•Squelch is fixed open.
	Operates as a squelch control in AM,
	FM and WFM modes.
	•RF gain is fixed at maximum sensitivity.

Adjusting RF gain (Receive sensitivity)

Normally, [RF/SQL] is set to the 11 o’clock position. Rotate [RF/SQL] to the 11 o’clock position for maxi-

mum sensitivity.

•Rotating counterclockwise from the maximum position re- duces sensitivity.

•The S-meter indicates receive sensitivity.

Adjusting squelch (Removing non-signal noise) Rotate [RF/SQL] clockwise when receiving no signal,

until the noise just disappears.

• [RX] indicator light goes out.

•Rotating [RF/SQL] past the threshold point invokes the S- meter squelch—this allows you to set a minimum signal level needed to open the squelch.

•When setting as RF gain/squelch control

	Noise squelch (FM/WFM mode)
Squelch is	Recommended level
open.	Maximum
	RF gain
RF gain	S-meter shows
adjustable
range	squelch level

•When functioning as RF gain control

(Squelch is fixed open; SSB, CW, RTTY only)

Adjustable range

Minimum RF gain Maximum RF gain

•When functioning as squelch control (RF gain is

fixed at maximum)

Noise squelch (FM/WFM mode)

Noise squelch
threshold	S-meter squelch
(FM/WFM mode)
	threshold
Squelch is	S-meter
	squelch
open.

Lowest threshold Highest threshold

While rotating the RF gain control, noise may be

heard. This comes from the DSP unit and does not indicate an equipment malfunction.

35