NHRC NHRC-4, Installation And Setup Gude

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NHRC-4 User Guide
Consult the TS-64 INSTRUCTION SHEET for details on setting the CTCSS frequency and
the reverse burst.
2.3.2 TS-32 Notes
The TS-32 must have the JU-2 jumper cut. Use the OUT-2 signal from the TS-32 into the
CTCSS detect of the NHRC-4. If you want to be able to disable the CTCSS requirement,
install a switch on the HANGUP lead.
Consult the TS-32 INSTRUCTION SHEET for details on setting the CTCSS frequency.
2.4 Using a NHRC-DAD with the NHRC-4
The NHRC-4 supports the NHRC-DAD digital audio delay on both the primary and
secondary radio ports. The NHRC-DAD is used to reduce or eliminate squelch crashes and
to allow the controller to fully mute DTMF tones.
J4 Primary Radio DAD Connector
J4 Secondary Radio DAD Connector
Pin Use
1 +13.8 Volts to delay board
2 Audio to delay board
3 Audio from delay board
4 Ground/Audio
Return
The audio delay for the primary radio simply plugs in to J4. The audio delay for the
secondary radio plugs in to J5. If the audio delay is not installed, a jumper between pins 2
and 3 of the port's delay connector must be installed, or the controller will not pass audio.
It is strongly recommended that the CTCSS filter be used, as described above, if both
CTCSS encode/decode and the audio delay are used.
The repeater controller needs to “know” that the delay is present in order to adjust the CAS
timing requirements to fully mute squelch crashes. Consult the NHRC-4 User Guide for
further information on programming the controller to indicate that the delay is present.
2.5
Using the Digital Output
The NHRC-4 Repeater Controller has a digital output that can be used for various remote
control applications or to control a fan on the repeater's transmitter. The digital output is an
open-drain into a power MOSFET, which is capable of sinking quite a bit of current, but we
recommend a maximum load of about 500 mA. Use a relay to drive larger loads. The open-
drain output can be used to gate the HOOKSWITCH signal to a TS-32 or other CTCSS
decoder. Software allows the output to be enabled, disabled, or pulsed. In fan control mode,
this output will be turned on when the transmitter is turned on, and turned off a
programmable amount of time after the transmitter is turned off. Consult the NHRC-4 User
Guide for information about how to control the digital output.
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