FAQ For Retevis RT90 DMR Mobile Radio

Retevis RT90 DMR mobile radio is a 50W high power dual band digital and analog mobile car radio Transceiver, it was widely used as long range communication solution for Jeeps, UTVs, off-road and other vehicles. This blog mainly organizes the questions about Retevis RT90 dmr mobile radio from customers, hope it can help you.

FAQ for Retevis RT90 DMR Mobile Radio Transceiver

Q: RT90 dmr radio in the US will we downscale 150-160mhz 450-460Mhz? how to do it?

A: When the Retevis RT90 DMR Mobile radio is turned on, unplug the power cord and press P1 and P2 to plug in the power cord.

Q: There is no port selection on the software of Retevis RT90 DMR Mobile radio, is there no need to select a port?

A: No port selection required

Q: What is the function of Band on Retevis RT90 DMR Mobile radio?

A: Band is the exit button

Q: Can I use the Retevis RT90 DMR Mobile radio to reach a distance of 60km? Mainly used for transportation, 60 kilometers back and forth on the mine to pull the material.

A: It needs to be used with the repeater. The repeater suggests to located in the middle of the two places. The antenna height is generally more than 40 meters and can reach a distance of about 50 kilometers. RT9550 and RT92 can be used.

Q: My Retevis RT920 DMR mobile radio was remote kill, what should I do?

A: Just use a good dmr radio to send and change the wake-up code, or use the program software to reprogram the frequency. You can only use the software to write and not read.

Q: Can Retevis RT920 DMR mobile radio use GPS function in analog mode? I am using RT90 as a base station and want to use it with an analog APRS repeater

A: In analog mode, the GPS function cannot be used, but in digital mode it is possible, the Retevis RT90 DMR mobile radio does not have APRS function, but it can realize APRS function with the help of hotspot, RT3S can be used, RT90 and RT3S software are the same, but can only be used in digital mode, there is no way to use APRS in analog mode

Q: What does Retevis RT90 DMR mobile radio requency step size mean?

A: Step value; in vfo mode, the frequency can be changed by step value, or the RT90 can be scanned by step value. VFO step value can be set in software

Q: What is the scanning method of Retevis RT90 DMR mobile radio frequency step size?

A: carrier scan.

Q: What is the encryption method of Retevis RT90 DMR mobile radio, is it AES 128 or AES 256?

A: ARC4

Q: What is the screen size of the Retevis RT90 DMR mobile radio?

A: Large screen size 72*31mm, small screen 62*22.5mm

Q: Is the front panel of the Retevis RT90 DMR mobile radio removable?

A: No.

Q:  Can the frequency of Retevis RT90 DMR mobile radio be adjusted?

A: Yes, write frequency 400-480Mhz 136-174mHz within the supported operating frequency range. You can write frequency manually by hand microphone or software.

Q: Can the Retevis RT90 DMR mobile radio directly input the frequency and enter the channel with the microphone?

A: The standard configuration is a key microphone, there are keys, and the corresponding frequency can be input through the key microphone.

Q: What is the programming pass word for Retevis RT90 DMR mobile radio? ?

A:1. There is no password by default, if you forget the password you set, please contact us to get the software to remove the password.
2. Please try 961510.
3. After installing the frequency writing software, click to open Setting.ini, change the password=0 in it to password=password and save it. Then open the software and read the frequency normally.

Q: Can the microphone of the Retevis RT90 DMR mobile radio be replaced?

A: As long as the connection is suitable, it is ok.

Q: Does the Retevis RT90 DMR mobile radio have a keypad lock?

A: Yes, it has.

Q: What are the contacts for the latest version of Retevis RT90 DMR mobile radio?

A:10000. 100,000 contacts can be imported after firmware upgrade

Q: Can I use Retevis RT90 DMR mobile radio to connect these two repeaters? Can it be used? Motorola SLR 8000 and Motorola SLR5500, Compatibility is no problem, right?

A: They are all DMR systems,  All AMBE-2TM vocoders, All compatible with digital protocol ETSI 102 361-1-2-3. 

RT90: DMR system, compatible with Mototrbo Tier I & II, the digital protocol used is ETSI TS102361-1,-2,-3, the digital vocoder used is AMBE++, if these two relays meet the above conditions.

Q: The information on the display of Retevis RT90 DMR mobile radio is abnormal and cannot be displayed. What should I do?

A: It should be upgraded without pressing the right button. Please press the button to enter the upgrade mode as required.
Then perform the upgrade operation.

Q: Is Retevis RT90 DMR mobile radio certified?

A: Yes, with CE certification.

Q: What should I do if the Retevis RT90 DMR mobile radio loses lock and cannot send and receive normally?

A: If the new version of the radio uses the old version of the firmware and upgrade method, it will cause the radio to lose lock and cannot send and receive normally. If the above situation occurs, it can be solved by upgrading the correct firmware according to the correct upgrade method;
If there is no problem with RT90, it is generally not recommended to upgrade the firmware

Q: How do I want to increase the communication range of the Retevis RT90 DMR mobile radio?

A: If you want to increase the communication range, there are the following measures: choose high-gain and good-quality antennas, choose low-loss and high-quality feeders, higher antenna erection heights, open environment or less obstacles and less interference.

Q: Can the Retevis RT90 DMR mobile Radio code plugin set all retevis devices?

A: Codeplug
Some are compatible, some walkie-talkies are not. RT3S can open the codeplug of RT90.
compatible or not depend on the following two points at the same time:
1. The codeplug suffix name is the same.

2. Try the software to see if you can open the codeplug of the RT90. 
If it can be opened, it is compatible. If it cannot be opened, it is not compatible.

Q: Can Retevis RT90 DMR mobile Radio mute a channel?

A: Long press ENT to mute a channel.

Q: What is the maximum amperage of the Retevis RT90 DMR mobile Radio?

A: up to 7A
5A lower
Normal at 6A

Q: The output power of the Retevis RT90 DMR mobile Radio is 50W, can the maximum distance be up to 70KM?

A: According to the usage environment
This power, the center frequency is the highest, others are low, and it depends on the antenna matching degree, and depends on the density of the building
If the antenna matching is good, at the center frequency point, in an open environment, it can meet.

Q: The Retevis RT90 DMR mobile Radio is used in the house. I have to set up an antenna outside. How long can the feeder be used without affecting the effect of the RT90. I think you should have a guide for this length.

A: The feeder is generally within 10M. Attenuates as it gets longer.

Q: Retevis RT90 DMR mobile Radio I didn't check Promiscuous MODE in the programming software, but it can hear the sound of other groups, what's wrong?

A: There is a group call match in the RT90 software settings, "group match", this needs to be checked, after checking, the Promiscuous MODE will not be enabled

Q: Can the frequency offset be set for the Retevis RT90 DMR mobile Radio VFO?

A: No

Retevis RT90 DMR mobile radio Transceiver Order link:

If you have any questions about Retevis RT90 DMR mobile radio or need any help, please comment below or contact us: info@retevis.com. The FAQ of each model is continuously updated based on customer feedback. Welcome to subscribe to Retevis Solutions for the latest information.