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NHRC-4 Repeater Controller
An Inexpensive Repeater Controller with linking capability
As seen in the September, 1998 issue of 73 Amateur Radio Today Magazine

The NHRC-4 is an inexpensive linking repeater controller. The controller has a "primary" and a "secondary" radio port. The primary port is used for the controlling repeater, and the secondary port can be used for a remote base, link radio, or "slaved" repeater. Unique courtesy tones provide feedback of the input source and link state.

The controller is programmable by sending DTMF sequences. The CW ID, hang time, ID timer, timeout timer and tail message counter can all be programmed by the user. All programming is password-protected, and is stored in non-volatile EEPROM memory.

The NHRC-4 has very low power consumption--less than 20 mA with the LEDs disabled--making it ideal for use in a solar-powered repeater.

[Picture of NHRC-4 Controller]
Click image to view a bigger picture.
  • Easily integrates with any repeater.
  • Secondary port can be remote base, link radio or slaved duplex repeater.
  • "Intelligent" ID algorithm.
  • Distinctive Courtesy Tones can indicate channel activity:
    • primary receiver courtesy tone.
    • primary receiver courtesy tone, secondary port transmit enabled.
    • secondary receiver courtesy tone.
    • secondary receiver courtesy tone, secondary port transmit enabled.
    • primary receiver courtesy tone, secondary receiver active, alert mode selected.
  • 1 Digital output:
    • Fan control (runs when transmitter on and n minutes after).
    • On/Off/Pulse commands.
    • Open-collector output.
  • Touch-Tone remote control and programming.
  • Hang timer, ID timer, Timeout timers, Fan Timer, and CW messages stored in non-volatile memory.
  • Individual audio gating on each port allows use of non-squelched receiver audio.
  • LED CAS, PTT, and DTMF indicators for primary port.
    CAS and PTT indicators for secondary port.
  • Extremely low power consumption.
NHRC-4 Version 3.0 Manuals

NHRC-4 Obsolete Manuals

NHRC-4 Assembled and Tested Linking Repeater Controller $159.00
NHRC-4 Version 3.0 Upgrade Includes new microcontroller IC and printed documentation $29.00
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