Motorola RDU4100 resource center

Motorola RDU4100 Resources

Quick start setup, RDX Series CPS programming help, FAQs and compatible accessories for the Motorola RDU4100. Free lifetime support from Two Way Radio Gear.

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Start setupComplete initial setup and verify basic operation. Configure the systemSoftware, settings, and matching equipment. Find a documentOpen manuals and model literature. Fix a problemCheck the most common causes first.

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Quick start

The shortest path from opening the box to basic operation.

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Model-specificStep-by-step

Get a new Motorola RDU4100 on the air in a few minutes.

Charge the battery fully before first use. A first charge from empty typically needs several hours in the supplied charger.
Power the Motorola RDU4100 on and set every radio in the fleet to the same channel so the whole team hears the same traffic.
Press and hold the Push-to-Talk button, pause briefly, then speak across the microphone rather than into it. Release to listen.
Fit an earpiece or speaker microphone if the team works in a noisy space - it is the single biggest clarity upgrade on any radio.

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Fleet setup

Programming

Keep a known-good configuration and make every radio in the fleet match.

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Model-specificFleet setup

The Motorola RDU4100 is programmed with RDX Series CPS over a Motorola programming cable.

Install RDX Series CPS on a Windows PC.
Connect the radio with the correct programming cable for this model and power it on.
Read the radio first so you have a working copy of its current codeplug before you change anything.
Make your changes, then write the codeplug back to the radio.
Clone the finished codeplug to the rest of the fleet so every radio matches.
Because this model transmits on licensed business frequencies, the frequencies programmed into it must match those on your FCC licence.

Every radio we sell can be programmed before it ships - tell us your channel plan and the fleet arrives ready to use.

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Product literature

Documents

Open the available files in a new tab so you keep your place in the hub.

ManualRDX user guide orig.pdfOpen PDF

Common questions

Frequently asked questions

Compatibility, licensing, setup, and support answers for this model.

Does the Motorola RDU4100 require an FCC license?

Yes. This radio transmits on FCC Part 90 business frequencies, which require a business radio license. We can file the application for you - just ask.

How do I program the Motorola RDU4100?

The Motorola RDU4100 is programmed with RDX Series CPS and a Motorola programming cable. We can also program the fleet before it ships so it arrives ready to use.

What band and technology does the Motorola RDU4100 use?

UHF business band, 4 W, 10 channels.

Will the Motorola RDU4100 talk to our older radios?

It will, provided the other radios operate on the same band and are programmed with matching frequencies and privacy codes. Send us a list of what you already run and we will confirm compatibility before you buy.

What support comes with the Motorola RDU4100?

Free lifetime technical support from our US-based team, programming help whenever your channel plan changes, and assistance with warranty claims.

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Troubleshooting

Fast checks for the issues that create the most support calls.

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Model-specificCommon checks

The issues we are asked about most on the Motorola RDU4100, and what to check first.

Cannot hear the team: confirm every radio is on the same channel. A single radio left on the wrong channel is by far the most common cause.
Short range: fit a fully charged battery, check the antenna is tight, and remember that steel, concrete and elevator shafts cut range hard.
Short battery life: charge fully in the supplied charger. Batteries are consumable - most fleets replace them every couple of years.
Audio muffled or distorted: clean the microphone and speaker ports and check the earpiece or speaker microphone is fully seated.
Radio will not power on: reseat the battery and confirm the charger contacts are clean and making contact.
Still stuck? Call our team - we support every radio we sell, for the life of the radio, at no charge.

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