When in RPT Mode, keying the Mic's PTT causes all selected radios to
transmit microphone audio. This can be used for transmitting on multiple
radios simultaneously where legal and appropriate.
11.5 Additional Functions
11.5.1 Watchdog Timers
Each Radio's PTT incorporates a Watchdog Timer that disables a Radio's
PTT after 3 minutes of continuous transmission. To reset the Watchdog
Timer and resume transmission, PTT must be released briefly. In RPT
Mode, the received signal being retransmitted must stop briefly. The
Watchdog Timer also resets automatically after 30 seconds even if PTT is
still keyed or the received signal has not stopped. This is helpful in the event
of a radio problem or other malfunction.
11.5.2 Front Panel Dimmer
The brightness of the front panel indicator LEDs is controlled by a photocell
located in the front panel. This provides indicators that are not too bright in a
dark environment but can still be seen in a bright environment.
12.0
C250C Option Board
The NCS-C250C is available with the following features provided by the Factory Installed Option
Board:
•
COR (Carrier Operated Relay)
This option causes the Busy Lights and the Repeater function to be controlled by digital Busy
signals from the radios. The sense of the busy signals from the radios is selectable either
"High = Busy" or "Low = Busy".
When the COR Option is installed, VOX operation of the Busy Lights and Repeater Function
is disabled.
•
Hookswitch
This option allows a Hookswitch or microphone "hang-up" signal to be sent from the
microphone through the C250C to the radios. In operation, the Hookswitch line of all
Unselected radios is pulled "low". When a radio is selected, that radio's Hookswitch line is
released unless the microphone connected to the C250C is hung up on a grounded hook. In
this case the Hookswitch line for the Selected Radio is pulled "low".
One example of use of this feature is to activate radios' scan functions. In this application, all
radios scan continuously. When the mic is lifted off its grounded hook, the Selected radio
stops scanning. Scanning on the Selected radio resumes when the mic is placed back on its
grounded hook.
NCS-C250C Instruction Manual Rev J
Copyright © 2004-2010 New Communications Solutions, LLC
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