Motorola RDU4100: Discontinued — Replaced by the Motorola CP100d
Discontinued Model • UHF 438-470 MHz • 4 Watts • 10 Channels • See the Recommended Replacement Below
⚠ This Radio Has Been Discontinued
The Motorola RDU4100 is no longer manufactured or available for purchase — Motorola has retired the entire RDX series. For new orders we recommend its direct replacement, the Motorola CP100d — a current dual-mode analog and digital UHF business radio that covers the same on-site use with a clear digital upgrade path. Already running RDU4100 radios and need batteries or accessories? Call our team at 1-800-984-1534 or contact our radio experts.
The Motorola RDU4100 was a rugged 4-watt UHF business two-way radio from the RDX Series, engineered for reliable, high-performance on-site communication across 89 business-exclusive frequencies with FCC narrowband compliance. It paired military-grade construction with enhanced audio to keep warehouse, retail, and job-site teams connected — and today that role is filled by the current Motorola CP100d.
What the RDU4100 Offered
4-Watt UHF Power
Strong, clear coverage across 89 business-exclusive UHF channels for dependable on-site range.
10 Channels
Enough channel capacity to keep multiple teams or departments organized on a single fleet.
Military-Grade Durability
Met MIL-SPEC standards for dust, wind, shock, and vibration — built for demanding work environments.
Enhanced Audio
Magnetic speaker field reduction kept transmissions clear in loud, busy spaces.
Advanced VOX Capability
Hands-free operation with compatible accessories for users who needed both hands on the job.
Custom Programming & Cloning
User-specific setup with a tricolor LED status interface and easy radio-to-radio cloning via an optional cable.
Technical Specifications
| Feature | Specification |
|---|---|
| Model | Motorola RDU4100 (Discontinued) |
| Series | Motorola RDX Series |
| Band / Frequency | UHF: 438–470 MHz |
| Power Output | 4 Watts |
| Channels | 10 (89 business-exclusive frequencies) |
| Mode | Analog |
| Audio | Magnetic Speaker Field Reduction |
| Durability | MIL-STD 810 C/D/E/F — Dust, Wind, Shock, Vibration |
| IP Rating | IP55 |
| Battery Life | Up to 15 hours |
| Programmable Buttons | 2 |
| License Required | No |
| Warranty | 2 Year Manufacturer Warranty |
| Status | Discontinued — replaced by the Motorola CP100d |
Recommended Replacement: Motorola CP100d
Now that the RDX series is retired, the Motorola CP100d Non-Display is the direct replacement for the RDU4100. It delivers the same simple, rugged UHF push-to-talk the RDU-series was known for and adds dual-mode analog and digital operation — so you can run alongside legacy radios today and migrate to clearer digital audio at your own pace. Need more channels and a display? The Motorola BPR50dX and the compact Motorola EVX-S24 are strong step-up options, and you can keep an existing fleet running with CP100d accessories. Browse more current options in our business two-way radios collection.
Where the RDU4100 Was Used
The RDU4100 was a no-license, no-nonsense workhorse for warehouses, retail floors, and light-industrial job sites that needed dependable push-to-talk coverage without a complex radio system. Teams looking for that same license-free simplicity today should explore the Mag One series or our broader range of license-free two-way radios.
See the Recommended Replacement →
Frequently Asked Questions About the Motorola RDU4100
• Is the Motorola RDU4100 discontinued?
Yes. Motorola has discontinued the RDU4100 and the entire RDX series, so it is no longer manufactured. The recommended current replacement is the Motorola CP100d. For fleet pricing or migration help, call 1-800-984-1534 or contact our radio experts.
• What is the best replacement for the Motorola RDU4100?
The Motorola CP100d is the closest match — a current UHF business radio with both digital and analog operation for an easy upgrade path. For more channels and a step up in features, the Motorola BPR50dX is a strong option.
• Can I still get batteries and accessories for the RDU4100?
In many cases, yes. Compatible batteries, chargers, antennas, and audio accessories may still be available — call our team at 1-800-984-1534 or contact our radio experts and we'll help you find parts or plan a fleet upgrade.
• What were the range and power of the Motorola RDU4100?
The Motorola RDU4100 was a 4-watt UHF radio operating on 89 business-exclusive frequencies with up to 10 channels, delivering strong on-site coverage for warehouses, retail floors, and job sites. The current Motorola CP100d provides comparable coverage with a digital upgrade path.
• Was the Motorola RDU4100 durable enough for tough job sites?
Yes. The Motorola RDU4100 met MIL-SPEC standards for dust, wind, shock, and vibration, and used magnetic speaker field reduction to keep audio clear in loud environments — making it a reliable choice for demanding industrial work.