Service manual

Operating Manual SL6000 Series
Page 17 of 27
When using CTCSS or DCS controlled squelch, several user groups may use the same
RF channel without overhearing the other groups. It is common practice to allow users to
listen to a channel before placing a call. This allows the user to check they are not going to
transmit over a conversation from another user group.
This allows more efficient use of the RF channels available.
Squelch level
The squelch level can be adjusted either by the PC programmer or by the user. By setting
the level high i.e. 10 the radio will open with a higher level of noise.
Squelch Level (N Band) 1-10
Squelch Level (S Band) 1-10
Busy channel lockout
The radio has several inhibit functions which restrict transmission under the following
conditions:
Busy Channel Lockout – ON: Upon PTT being pressed, if carrier is present, the radio shall
not transmit and an audible alert tone will be heard.
Busy Channel Lockout – OFF: Upon PTT being pressed, the radio shall transmit
regardless of the presence of carrier.
Mark idle
Marked Idle enabled: Can only be enabled if Busy Channel Lockout is ON. If the Busy
Channel Lockout is on and carrier is detected, the radio permits transmit if the RX squelch
option is valid.
TOT timer
Once the TOT has been enabled, the PTT Timer can be set from 0 – 990 seconds with 10
second increments, which is the allowed time for a sustained transmission.
Penalty time
The penalty timer does not allow a transmission for a set programmed time after the PTT
timer has expired, to allow a cool off period for the transmitter. The settings are from 0 –
75 s in 5 sec. increments.
B
B
B
a
a
a
s
s
s
i
i
i
c
c
c
R
R
R
a
a
a
d
d
d
i
i
i
o
o
o
O
O
O
p
p
p
e
e
e
r
r
r
a
a
a
t
t
t
i
i
i
n
n
n
g
g
g