E F Johnson Company 2425180 Benutzerhandbuch
TRANSCEIVER PROGRAMMING
3-14
September 2001
Part No. 001-5100-001
No Priority -
Priority sampling does not occur (all
channels are scanned in sequence). The radio trans-
mits on the selected channel.
mits on the selected channel.
Priority/Tx Priority -
Priority sampling occurs
and the priority channel is the one programmed in
the selected scan list. The radio transmits on the
priority channel.
the selected scan list. The radio transmits on the
priority channel.
Priority/Tx Selected -
Priority sampling occurs
and the priority channel is the one programmed in
the selected scan list. The radio transmits on the
selected channel.
the selected scan list. The radio transmits on the
selected channel.
Priority on Sel Chan -
The priority channel is
always the selected channel (even if the scan list is
programmed with a priority channel). The radio
transmits on the selected channel.
programmed with a priority channel). The radio
transmits on the selected channel.
Talkback -
No priority sampling occurs. The radio
transmits on the channel of a call while scanning is
halted. Then when scanning resumes, it transmits
on the selected channel.
halted. Then when scanning resumes, it transmits
on the selected channel.
Scan Timers
Scan Hold Time -
Sets the delay that occurs before
scanning resumes after a signal is no longer
received (see Section 2.5.4).
received (see Section 2.5.4).
Lookback Time A -
This time determines how
often the priority channel is checked for activity.
Times of 0.25-4.00 seconds in 0.25-second steps
can be programmed.
Times of 0.25-4.00 seconds in 0.25-second steps
can be programmed.
Lookback Time B -
This time determines how
often the priority channel is checked once an incor-
rect Call Guard (CTCSS/DCS) or NAC code is
detected. Since it takes much longer to detect an
incorrect Call Guard signal than a carrier, this time
should be relatively long to prevent the interrup-
tions from making a message difficult to under-
stand. Times of 0.5-8.0 seconds can be
programmed in 0.5-second steps.
rect Call Guard (CTCSS/DCS) or NAC code is
detected. Since it takes much longer to detect an
incorrect Call Guard signal than a carrier, this time
should be relatively long to prevent the interrup-
tions from making a message difficult to under-
stand. Times of 0.5-8.0 seconds can be
programmed in 0.5-second steps.
Priority Channel Selection
The Scan Mode parameter just described selects
if priority channel sampling is enabled on the selected
scan list. It also selects the type or priority channel
(either fixed or selected) if applicable.
scan list. It also selects the type or priority channel
(either fixed or selected) if applicable.
If the “Priority/Tx Priority” or “Priority/Tx
Selected” mode is programmed, fixed priority
sampling is selected. The priority channel must then
be chosen for the scan list. To do this, click the
sampling is selected. The priority channel must then
be chosen for the scan list. To do this, click the
button in the Modify Scan List screen
and then select the desired zone/channel. If any of the
other modes is selected, the priority channel does not
need to be chosen. Refer to Section 2.6.13 for more
information on priority sampling.
other modes is selected, the priority channel does not
need to be chosen. Refer to Section 2.6.13 for more
information on priority sampling.
3.5.3 CONVENTIONAL SYSTEM INDIVIDUAL
CALL LIST SCREEN
NOTE: This screen can be left unprogrammed if no
conventional Project 25 digital channels are
programmed or individual calling is not used.
conventional Project 25 digital channels are
programmed or individual calling is not used.
Individual calls can be placed on Project 25
digital channels as described in Section 2.6.16. The
IDs that can be called are programmed in the Indi-
vidual Call List programmed by the Individual Call
List screen. This screen is shown above, and the
parameters it programs are as follows:
IDs that can be called are programmed in the Indi-
vidual Call List programmed by the Individual Call
List screen. This screen is shown above, and the
parameters it programs are as follows:
Modify List Button - Clicking this
button displays the screen that programs the alias
(tag) and individual ID for each call. An alias can
have up to 10 characters, and the individual IDs can
be 1-16777216.
(tag) and individual ID for each call. An alias can
have up to 10 characters, and the individual IDs can
be 1-16777216.
Delete Entry Button - Clicking this
button deletes the selected entry.