NXU-2B Operations Manual
1-5
Interoperability Now!
1.7
Differences Between the NXU-2B and the NXU-2A
The NXU-2B is an updated and improved redesign of the popular NXU-2A device. Tens of
thousands of the NXU-2As are currently in operation, and the NXU-2B maintains compatibility
with those units.
Some improvements extend beyond the incorporation of updated electronic components and are
listed below:
•
The pinout of the Audio/Control connector on the rear panel of the unit is different
between the NXU-2A and the NXU-2B. The NXU-2B pinout has been changed to match
that of other JPS products such as the ACU product family. This allows standard JPS
radio cables to be used with the NXU-2B with no adapter needed. Previously an audio
crossover adapter was included with the NXU-2A to allow standard JPS radio cables to
be used. This adapter is not required with the NXU-2B and is not included. Please refer
to Table 2-3 for the pinout of the Audio/Control connector.
•
The NXU-2B uses transformer-coupled balanced audio for both input and output audio.
The NXU-2A only had balanced input audio and single-ended output audio.
•
The NXU-2B audio input and output levels are electronically adjustable via the web
browser interface and are saved in non-volatile memory. This allows audio level
adjustments without requiring the operator to be at the location where the NXU-2B is
installed. The NXU-2A had rear panel mechanical potentiometers for the adjustment of
audio input and output levels. This upgrade prevents any need to travel to a remote radio
site if audio level optimization is desired.
•
The NXU-2B uses hardware relay contacts for PTT output while the NXU-2A had a solid-
state (open drain transistor) keying output. There is a jumper selectable solid-state output
available on the NXU-2B as well, but the default is to use the relay for PTT. The relay
allows for higher keying voltages and currents than the solid-state output.
Note: If replacing an existing NXU-2A with an NXU-2B, be sure to remove the
adapter at the rear panel AUDIO/CONTROL connector (assuming one is being used).
This adapter is not needed when using a JPS Radio Interface Cable with an NXU-2B.
Summary of Contents for NXU-2B
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