Operation
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communications can occur while the ID is being sent. If an ID is not specified for a tone/code, one
will not be sent.
Hog Mode
The tone panel operation has a Hog mode to prevent “airtime hogs” from monopolizing the channel.
Each tone/code can have the Hog mode enabled or disabled. When enabled, the mobile can have
uninterrupted access to the repeater up to the
Hog limit
time. Once this timer has expired for a user,
he is denied access to the repeater for the
Hog penalty
time. A user can prevent going into the
penalty stage by unkeying and allowing the repeater to remain idle for the
Hog idle
time. This gives
another mobile on the channel a chance to have access to the repeater. Each time the
Hog idle
timer
expires, it resets the
Hog limit
timer for that tone/code.
TX Timeout
To prevent a stuck microphone from keeping the transmitter continuously keyed, the TX timeout
timer provides a maximum amount of time that the Model 748 will keep PTT keyed.
Stuck Mic ID
In case of transmitter timeout, you can enable the Stuck mic ID feature. When enabled, the Model
748 will keyup and send the offending tone/code number, in DTMF, once every 15 seconds for the
duration of the error.
Carrier Squelch Repeat
The Model 748 can act as a carrier squelch repeater panel. Upon seeing carrier, the Model 748 will
key the transmitter and allow repeat audio. If a sub-audible tone/code is detected, it will revert to the
programming for the detected sub-audible tone/code. This allows the Model 748 to be installed
where there is a need to support dispatch for both carrier and tone squelch radios.
DTMF Repeat
At default, the Model 748 mutes repeat audio upon decoding a valid first digit of an ANI. When
enabled, DTMF Repeat prevents any DTMF from muting the repeat audio during tone dispatch
operation.
INTERCONNECT GATEWAY
Interconnect Gateway is a new feature that has been added to the Model 748 in software Version
1.21 as part of the 154 User Option (D25). This feature allows two distant coverage areas to be
linked together through the PSTN using a pair of Model 748’s. A typical application is to link
together a dispatch user group that is in two different locations. This makes it ideal for installation
into existing systems, increasing the range of communications possible without the need for
expensive upgrades of existing radios. Call setup can be as simple as just keying the radio (no
DTMF originate) or use short sign-on (single digit ANI) for selecting the site you wish to link with.
How It Works
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