Navman MCB 7270 operation manual Sql, Band, 3CH, Dim

SQL	Squelch or Threshold Level knob. Sets the threshold level for the minimum
	receiver signal.
	Turn fully anti-clockwise (left) until random noise is heard, then turn slowly
	clockwise (right) until the random noise disappears. Make another ¼ turn clockwise
	for best reception in open sea conditions.
	In areas of high noise (eg close to large cities) reception may improve if sensitivity is
	reduced by turning SQL slowly clockwise (right). Also see REJ (noise rejection) and
	LOC (Local mode) because these may also improve reception quality.
88/9	Priority Channel (Australia). Also on the microphone. Press to cancel all other
	modes and tune into the priority channel (CH88 if MB is selected, or CH9 if CB
	is selected). See Section 2.3.6 for an example. Press 88/9 again to return to your
	original channel.
	In countries other than Australia, consult your dealer about your local priority
	channels.
BAND	Channel Band. Press to toggle between marine (MB) and land (CB) channel band
	frequencies. The screen shows the selected channel band and radio tunes to the
	most recently used channel in that channel band. See Section 2.3.2 for an example.
	Appendix C shows the frequencies for each channel band.
3CH	Three Favourite Channels. Also on the microphone. You can store three favourite
	channels for marine (MB) and another three favourites for land (CB) channel band
	frequencies.
	To store a favourite channel for the first time, select the channel band, then the
	channel. Press and hold 3CH for at least 1.5 seconds to store it in the CH1 location.
	Repeat the procedure to store two more favourite channels in the CH2 and CH3
	locations respectively. See Section 2.3.9 for an example.
	NOTE: If you try and add another favourite channel with 3 already stored,“FL”
	shows in the display. You may store a new CH3 frequency only after deleting
	the old one. CH1 and CH2 remain unless you delete them.
	To select a favourite channel, select the channel band then press 3CH to toggle
	between your favourite channels. The channel band and CH1, CH2, or CH3 are
	displayed to show which favourite channel is currently selected.
	To delete a favourite channel, select it then press and hold 3CH for at least 1.5
	seconds until the CH1, CH2 or CH3 symbol disppears off the screen.
DIM	Backlighting. Press repeatedly to step through the settings (OFF, LOW, MED, HIGH)
	until the desired backlight level is obtained.
SCAN	Scanning Mode. PSCAN and ALL SCAN modes are available on both land (CB) and
	marine (MB) channel bands.
	To scan one channel, select that channel then immediately press and release SCAN.
	The radio goes into PSCAN mode; scanning the selected channel and automatically
	checking the priority channel once every 4 seconds (like Dual Watch mode).
	To scan one favourite channel, select that channel with 3CH then immediately
	press and release SCAN. The radio goes into PSCAN mode; scanning the favourite
	channel and automatically checking the priority channel once every 4 seconds
	(like Dual Watch mode). See section 2.3.11 for an example.

8 NAVMAN MCB 7270 Marine CB 27 MHz Radio Operation Manual