If your team has been running on the Motorola RDU4100 or RDU4160D, you already know why they were so popular: tough, simple, and they just work. They were two of our best sellers for exactly that reason.
Both models have now been discontinued. The question we get asked most is a practical one:
What replaces them without forcing you to start over?
You need a replacement that works alongside your existing radios, matches your current channel plan, and delivers the durability your team is used to. There are two good paths, depending on whether you want the simplest possible swap or a radio that can grow with you.
Option 1: Motorola CP100d — the closest drop-in replacement
Best for: teams that want the smoothest transition with the least disruption.
If your priority is "make it work like the RDU did, right out of the box," the Motorola CP100d UHF analog is the cleanest solution.
- Pre-programmed to match your RDU4100 / RDU4160D channel setup, so it slots into your fleet with minimal friction
- Replace one at a time as older units fail, without changing how your team operates
- No retraining. Same concept, same workflow — push to talk and go
- It costs less than the radio it replaces. The CP100d is $277 against the RDU4100's $309 and the RDU4160D's $329
If you're coming from an RDU4100, you also gain channel capacity — 16 channels against the RDU4100's 10.
Bottom line: if you want the most "business as usual" transition, the CP100d is the safest bet.
Option 2: Motorola BPR50dX — the upgrade that still plays nice
Best for: teams that want to modernize over time while staying compatible today.
The Motorola BPR50dX UHF supports both digital and analog, which is what makes it flexible:
- Digital and analog in one radio — keep talking to your existing analog fleet now, move to digital when you're ready
- 5 watts of UHF power helps maintain performance in busy environments
- 64 channels makes it easy to mirror your current setup and plan for growth
- Reduces channel congestion and improves clarity as you expand
One thing to weigh: the BPR50dX carries a 12-month warranty, against 24 months on the CP100d. If warranty length matters to your purchasing process, factor that in.
Bottom line: if you want a radio that keeps your current team connected and sets you up for later, the BPR50dX is the more flexible move.
RDU4100 / RDU4160D vs. CP100d vs. BPR50dX
| Feature | RDU4100 / RDU4160D | CP100d | BPR50dX |
|---|---|---|---|
| Status | Discontinued | Current | Current |
| Technology | Analog | Analog | Analog + Digital |
| Band | UHF 438–470 MHz | UHF 403–480 MHz | UHF |
| Channels | 10 (RDU4100) / 16 (RDU4160D) | 16 | 64 |
| Power output | 4 watts | 4 watts | 5 watts |
| Talks to your existing RDU fleet | — | Yes, pre-programmed | Yes, in analog mode |
| Warranty | 24 months | 24 months | 12 months |
| Price | $309 / $329 | $277 | $337 |
| Best for | — | Simplest swap | Staged upgrade |
Many businesses do both
You don't have to choose one for the whole fleet:
- CP100d for straight one-for-one replacements as radios fail
- BPR50dX for supervisors, leads, or areas that benefit from the extra capability
Both run analog, so everything stays on the same channels and keeps talking.
The step that matters most: match your channels
Seamless integration comes down to one thing. Your new radios must match your existing channel and frequency setup.
If you've ever had a "we bought radios and they don't talk to the old ones" moment, you know how painful that is — and how avoidable.
If you aren't certain what your current radios are programmed to, we can confirm it before you order. See our radio programming page, or just ask.
Frequently asked questions
Is the Motorola RDU4100 discontinued?
Yes. Motorola has discontinued both the RDU4100 and the RDU4160D. The closest replacement is the CP100d UHF analog, which can be pre-programmed to match your existing RDU channels.
What replaced the Motorola RDU4160D?
The CP100d UHF analog is the closest drop-in replacement, matching the RDU4160D's 16 channels and 4-watt output. The BPR50dX is the alternative if you want a radio that also supports digital.
Will a CP100d work with my existing RDU4100 radios?
Yes. Both are analog UHF radios, so once the CP100d is programmed to the same channels, they communicate normally. We pre-program them to match before shipping.
Can I still use my RDU4100 radios?
Yes. A discontinued radio doesn't stop working. The practical issue is spares and batteries, which get harder to source over time — which is why most teams replace gradually rather than all at once.
Do I need an FCC license for these radios?
The RDU4100, RDU4160D, CP100d and BPR50dX all operate on UHF business frequencies, which require an FCC Part 90 license. We can help you with the process.
Need help replacing your RDU fleet?
Tell us three things — what environment you work in, how many radios you're replacing, and whether you want drop-in simplicity or a future-proof upgrade — and we'll recommend the cleanest path and provide pricing for your fleet.
