RT81 Dual Time Slot High Power UHF DMR Radio

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- Digital/Analog Double Modes
- 2200 mAh Large Battery Capacity
- Digital Encryption and Crystal Sound
- 32 Channels (2 Zone)
- Dual Time Slot
NOTE: Please download the Programming Software from “SUPPORT”
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See our refund policy for more details about what is needed for a smooth refund process.
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This limited warranty provided by the manufacturer in no way affects a potential statutory warranty provided by law.
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OverView
1. Retevis RT81 Dual Time Slot UHF High Power DMR Two Way Radios
2. Digital Encryption
Secure communications are an essential requirement, especially for public safety applications, RT81 is equipped with 10-bit key data encryption, walkie talkie prevents eavesdropping and avoids interference to ensure secure communication.
3. Long Battery Life
Built-in 2200 mAh battery, an operating time of 15 hours in analog mode and 25 hours in digital mode, and is suitable for daily use.
4. Crystal Sound
Security personnel typically work in a busy, noisy environment. The sound quality of the walkie-talkie is especially important. Due to the built-in high quality speakers, the DMR walkie-talkie provides better noise cancellation. In a noisy environment, it is possible to communicate with others in better quality.
5. Sturdy Body
In the security process, it often happens that the walkie-talkie falls down by running. Therefore, there are certain requirements for the fall resistance of the walkie talkie. A robust shell with stronger protection against falls and earthquakes is more durable.
6. High/Low Power Selection
High power has a longer call range. Low power has a longer battery life. The selection between high and low power can be used flexibly, allowing you to choose the appropriate power in different situations.
7. Private/Group Call
For security, it is necessary to communicate. The walkie-talkie supports individual and group call with ID, by setting the frequency, time slot, etc. to meet complex communication requirements.
8. Digital /Analog
Since the walkie talkie is compatible with both analog and digital modes. It not only retains the analog radio function, but also has the advantages of digital radio, such as better radio performance and longer battery life, higher energy efficiency, and in the meantime reduces the cost of equipment replacement.
9. Dual Time Slot
The walkie talkie has three modes: simplex, repeater, and simplex dual time slot. In simplex mode, the walkie talkie communicates in different time slots, which improves communication efficiency. In Repeater mode, the walkie talkie increases the communication distance. Dual Time Slot expands the channel capacity and extends the communication distance.
10.Six Advantages of DMR
DMR technology offers six benefits, including doubling the capacity of existing licensed channels, backward compatibility with legacy systems, longer battery life, and increased energy efficiency that improves working efficiency, extends walkie talkie life, and reduces equipment replacement costs.
11. Various Application
RT81 high power dual-time radio for rescue, security, Firefighting
12. Radio Details
13. Specification
14. Package Includes
What’s in the Box?
- 1 x RT81 Two Way Radio
- 1 x Li-ion battery
- 1 x Antenna
- 1 x Adapter
- 1 x Charger
- 1 x Belt clip
- 1 x Sling
- 1 x Instructions
Package includes:
Spec
Specification:
Model | Retevis RT81 |
Frequency | UHF 400-470MHz |
Mode | Digital/Analog |
Power | 10W |
Channel capacity | 32(2 Zone, 16 channel per zone) |
Zone | 2 |
Working voltage | 7.4V |
Working temperature | -30℃~+60℃ |
Storage temperature | -40℃~+60℃ |
Continuous working time | Analog:15 hours,Digital:25 hours |
Battery capacity | 2200mAh |
Weight(include battery) | 9.32oz/264g |
Radio size(include battery) | 5.48x2.51x1.45in(139x64x37mm) |
Receiver | |
Channel spacing | 12.5/25KHz(Digital mode 12.5KHz) |
Frequency stability | ±1.0ppm |
Analog sensibility | 0.35µV/-116dBm(20dB SINAD) |
0.2µV/-120dBm(Typical) | |
Digital sensibility | 0.3µV/-117.4dBm(BER5%) |
0.7µV/-110dBm(BER1% | |
Spurious response | TIA03C:65dB |
ETSI:65dB | |
Adjacent channel selectivity | TIA603C:60dB@12.5KHz |
ETSI:60dB@12.5KHz | |
Spurious response suppression | TIA603C:70dB ETSI:70dB |
Receiving spurious emissions | <-57dBm@1GHZ,>-47dBm |
Blocking | 84dB |
Rated audio power | 1W |
Audio response | +1dB—-3dB |
Rated audio distortion | ≤3% |
Transmitter | |
Channel spacing | 12.5/25KHz(Digital mode 12.5KHz) |
Frequency stability | ±1.5ppm |
TX power | Low:1W High:10W |
FM noise | -40dB@12.5kHz |
Spurious emission | <-36dBm@1GHz,>-30dBm |
Adjacent channel selectivity | -60dB@12.5KHz |
FM modulation mode | 12.5KHz:11FOF3E |
4FSK digital modulation mode | 12.5KHz(data only)7K60FX |
12.5KHz(data+voice)7K60FX | |
Modulation limit | 2.5KHz@12.5KHz |
Audio response | +1dB—-3dB |
Rated audio distortion | ≤3% |
Digital protocol | ETSITSI02361,-1,-3 |
Vocoder type | AMBE+2TM |
Note: Specifications will be revised without notice due to technical improvement.
Feature
Feature:
- Private call, group call, all call in digital mode
- Encryption
- Wideband /Narrow band selection
- Online update
- Busy channel lockout
- English and Chinese audio prompt
- Time out timer
- TX high/Low power selection
- Read and write by computer
- Digital/analog double modes
- 32 Channels(2 Zone)
- Talk around
- Side key programmable
- Battery indicator
- End-tone elimination
- VOX function
- Double time slot
- Battery save/Low battery alarm
- Monitor
Product Reviews
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C. Farmerlong range radioReviewed on Jul 14,2022high power radio,which communicate with 10meters ,long distance radioBarry Robinsonwork greatReviewed on Jul 14,2022In DMR simplex these radios work very well even though they do not have a TX beep which is very annoying. In DMR duplex (repeater), they TX on BOTH time slots which, oddly enough are labeled 0 and 1 in the CPS. I'm forced to remove any repeater activity and use these for simplex operations only. Retevis, if you need to contact me about this you have my work email. - BarryBrannan V Clowardgood radiosReviewed on Jul 14,2022The time slot issue has been resolved and now the radios work fine for basic simplex and duplex conversations. Private call does not work. There is no TX beep in digital. Installing the driver so I could program the radios was absolute hell. However, if you can get past all this, the price point on these are good radios. Since the employees in my company eat radios like candy, I see myself buying many, many more of these. I just hope Retevis does not discontinue these like they did the RT50.JimLamaisonhigh power radioReviewed on Jul 14,2022These radios are the real thing. A clean, 10-watt digital DMR signal paired with a decent antenna will mean serious range and woods penetration. high power radio make to Easily acheive 8-10 miles through wilderness and heavily wooded areas handheld to handheld inside a car! Please make sure you have your amateur license and don't just buy these, flip them to channel 1 and go. These radios are very advanced and can be used in both analog and digital uhf modes which is great for emergency access to repeaters! These are my everywhere radios, kayaking, snowmobiling you name it. If you don't need a display, save a few bucks by getting these very rugged radios over the ones with the green display. Battery life is awesome and these radios will standby for about a week. I don't know how great it is to have 10 watts radiating this close to your face but the comms are great! Digital signal takes some getting used to but overall I would prefer a digital conversation any day...Clyde Osterhoutgreat radioReviewed on Jul 14,2022The radios were purchased since we had a couple of jobs that were underground and I wanted our crew to be able to communicate and be safe. we used the radios for about two days and one of my workers broke the tabs off of the battery when he was trying to put it in place (I ave no idea how he did this) so it had to be held together with a zip-ty. I noticed he had the zip-ty on there and asked him what happened and he just said that he tried to jam it in place and broke it. I contacted the seller and sent them a photo and short description of the issue and had a new battery sent to me at no charge within a few days. Way cool. He also tore up one of the ear pieces when he was pulling some cable up to the top of a hole and he caught it on the ear piece wire and yanked it out of his ear.....this guy is hard on my equipment...not sure how much longer I can afford to keep him...hahahha. Overall the radios work. I took one to home Depot and was able to communicate up to about 2 miles away. We are working in an underground tank that is 30' below the surface of a parking lot and is 120' wide by 250' long and we have no issues communicating to the topside. These are pretty good quality for the price. One of my workers races trophy trucks and Class 1 buggies in Baja and he is familiar with these types of radios. He was surprised at the quality, features and the functionality of the radios for the cost. So I guess you can say that they are good value and function pretty well.Cathy leeemergency radio.Reviewed on Jul 14,2022Radio is great in battery life and clarity. It transmits when on a channel that is programmed RX only. It's a emergency radio.Racer 10Good qualityReviewed on Jul 14,2022Good quality, good range, easy to program. Not super loud on std military type headset. No way to check the battery, only a warning when low.George Specklong distanceReviewed on Jul 14,2022As for the radio itself, it appears to be well made and is solid in the hand. I have no complaints about build quality and the fact that it's waterproof is a plus for us since we live in the rainy Pacific Northwest and my wife and my children often walks our dog in the rain. The radio can potentially operate at longer distances since it's 10 wattsbut I haven't tested range and frankly I'm skeptical that the added wattage will make a significant range distance especially since we have an MD380 on one end and an RT81 on the other.Maria Taylorsimple radioReviewed on Jul 14,2022The RT81 is exactly what I was looking for. A dead simple radio with no display and not a lot of buttons to get in the way. It is a solid utilitarian radio that can be used in the outdoor elements. I also purchased a Retevis waterproof speaker microphone so my wife can keep the radio in her pocket or on her belt with the microphone near her shoulder. This makes it easier for her to talk when holding a dog leash in one hand, while pressing the microphone button with her other hand.Bayani Cruzeasy to useReviewed on Jul 14,2022I strongly do to buy the RT81P, The RT81 is designed more like a business radio. Something that you program with a computer, give it to an employee and it just works. it's very to easy to use, They can accidentally turn the knob to change channels but they can't change a lot of other options. To avoid accidental channel changes all 16 channels on the rotary knob could be set to the same frequency, or the user could just be told to always have the rotary channel knob all the way to the left or they will be dipped in hot oil.
Support
Firmware/Software
- RT81-UHF-Software-v1.05
- win11-DriverInstaller
The win11 driver is compatible with win10, win8 and win7 systems.