Section 3. Operation
3-4
risk of being taken over by another local co-channel repeater system in a busy market,
rendering it unavailable whenever the original user wants to resume using "their tone".
To help prevent this problem, the 37-MAX provides a feature called the Reserve mode.
When an ENABLED user is placed in this mode, the panel will still key upon decoding that
tone or code, but it will not pass audio. Instead, the 37-MAX will transmit a beep tone to
indicate to anyone monitoring the channel that a reserved tone is in use. The panel will still
encode the proper CTCSS tone or DCS code for this user.
Disabling a user number will prevent that user from operating in Reserve mode. Temporary
or seasonal users that the system operator plans to use in the future should always be
reserved, not simply disabled, whenever they enter a period of idleness.
Tone Translation
The fixed relationship in the Model 37-MAX is between the user number and the CTCSS
tone or DCS code that is
decoded
. The default is for the panel to encode the same tone or
code that is decoded for a user, however, this relationship can be altered in programming.
Each user may be programmed to encode any CTCSS tone or DCS code, or to not encode at
all.
NORMAL OPERATION
The items in this subsection cover how the panel behaves while operating in its normal mode.
The actions of the Model 37-MAX will be determined by both which features have been
enabled in programming and what signals are coming to it from the receiver.
Carrier is Detected
Whenever the 37-MAX receives a carrier detect signal from the receive radio, it will first
check to see if the panel is programmed for Carrier Repeat operation (user number "0" is
enabled). If Carrier Repeat is enabled, then the 37-MAX will key the transmitter and unmute
the repeat audio path. If an encode tone or code has been programmed for the "0" user
number, it will be encoded. If the Carrier Repeat function has not been enabled, then the
Repeater Pal will not take any actions until it checks for decode of a CTCSS tone or a DCS
code.
Valid Tone or Code is Detected
After responding to the carrier detect signal from the receiver and determining that it is not
enabled to do Carrier Repeat, the Model 37-MAX will start its decode software routines to
determine if there is a CTCSS tone or DCS code in the receive signal. Once the panel
determines which tone or code is present, it looks in its user database to see if that tone or
code is enabled. If the tone or code is not enabled the panel ignores it. If the tone or code is
enabled, the panel checks whether or not it is Reserved. If the Reserved mode is not enabled
for that user, then the 37-MAX will key the transmitter, start encoding the programmed tone
or code for that user, and unmute the repeat audio path. The 37-MAX will remain in this
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