NHRC NHRC-4/M2, Инструкция по установке и настройке

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NHRC-4/M2 User Guide
Page 4 Copyright
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2001, 2005, NHRC LLC. All Rights Reserved.
2.2 Secondary Radio Port Wiring
The controller provides the secondary radio port on the F3 through F8 frequency select
leads, using the P909 connector. These leads are routed to the front panel control cable
connector on the systems board. In mobile MASTR II radios, these control lines are
sometimes subject to the installation of diodes and jumpers and cutting of traces to share
channel elements across more than one channel selection. These diodes and jumpers must be
removed, and the cut traces must be jumpered to for proper operation of the controller.
Consult the MASTR II service manual for information on these jumpers.
Dissecting an old control cable makes an easy job of attaching your secondary radio to the
MASTR II. In an E-chassis MASTR II, a bit of clever wiring in the systems board can allow
a repeater on the "top deck" and the secondary, remote-base radio on the "bottom deck".
In base stations and repeaters, the P909 connector is unused. Individual wires must be
attached to P909 to break out the secondary radio port.
P909 Secondary Radio Port Connections
P909
Pin #
NHRC-4/M2 Use
Frequency
Select
J901
(control cable)
Pin #
1 Secondary port CAS F8 15
2 Secondary port PTT F7 14
3 Secondary port CTCSS detect F6 13
4 Secondary port receiver audio F5 12
5 Secondary port transmitter audio F4 11
6 Digital output F3 10
7 no connection F2 9
8 Unused, ground to select F1 F1 8
It is extremely important that the radio attached to the secondary radio port be provided with
a common ground from the MASTR II. The "A-" lead (J901 pin 30) is a good spot. If this
common ground is not provided, erratic operation or distorted audio on the secondary radio
will result. Also note that the Secondary port CAS requires an active high signal. Consult the
NHRC-4/M2 Remote Base Breakout Application note for instructions on converting CAS
from active low if an active high signal cannot be supplied.