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Operation
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PAGE FORWARD
Each interconnect user can have his unanswered calls forwarded to a second user in the database.
When a call comes in for a particular user (radio), the Model 748 tries to reach him. If the called
mobile does not answer, and he has a
Page forward user
programmed, the Model 748 will try to call
that user (radio) next. An example of how to use this feature would be, say a customer has a mobile
radio in his truck and a handheld transceiver that he carries. The mobile would be his primary user
(radio) in the database. The handheld is his secondary user (radio) in the database. His two users are
cross-referenced in the database via the Page forward user. This means that if he can receive calls on
either radio (mobile or handheld), he will be sure to receive the call, even if he is at the other radio.
This feature will only forward the call once.
AUXILIARY INPUT
The Model 748 has one active low input that can be configured for either transmit “Channel busy” or
“Site status”. This input is internally pulled high. If set for “Channel busy”, the Model 748 will not
key the transmitter with the input held active or low. With a secondary receiver monitoring the
transmit channel, a relay output can feed this input to meet FCC Part 90 requirements. If set for “Site
status”, the Model 748 will issue a 1500Hz tone just prior to unkeying the transmitter with the input
held active or low. This could be used to indicate if the site is on battery power or main power. Just
keyup on a valid tone and get an instant status check. The current status of this input is always
available via a DTMF programming inquiry command. See “DTMF Programming” in Section 4 for
details.
AUXILIARY OUTPUT
The Model 748 has one open drain output (FET to ground). This output can be set via two methods:
1) DTMF programming or, 2) Supervisor user access. See “DTMF Programming” in Section 4. For
Supervisor access, an additional steering digit has been added, “6”. When the Supervisor user's
access ANI is received followed by a steering digit of “6”, the Model 748 will keyup and send a high
or low tone, indicating current setting of the auxiliary output (high = active, low = inactive). A “*1”
will set it active and return a high tone, a “*0” will set it inactive and return a low tone. The Model
748 then drops off the channel. The auxiliary output will remember its current setting even after a
power failure. It keeps the current setting in battery-backed RAM.
REPEATER PANEL OPERATION
The Model 748 supports all 50 CTCSS tones and 104 commonly used DCS codes. When a valid
(enabled) tone/code is decoded, the Model 748 will key the transmitter, encode the programmed
tone/code and process the audio between the receiver and transmitter.
Tone Validation
Each tone/code may be selectively enabled or disabled. Anytime one of the 154 tones/codes is
decoded, it is also tracking airtime (default is to accumulate), regardless of whether it has been
enabled or not. This provides the system operator with co-channel loading information as to which
tones/codes are currently being used. Any valid (enabled) tone or code can have any other tone or
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