FAQs on Retevis RB91 and RB24 Long Range Radio Communication Solution-Part 2

Retevis RB91 digital repeater with RB24 digital handheld radios is a long range radio communication solution that is specifically designed to overcome communication issues in closed environments. Following up on FAQ Part 1, we'll answer seven more frequently asked questions about this long distance communication to help you learn more about this solution.

RB91 LoRa Repeater + RB24 Digital Handheld Radio

7 Frequently Asked Questions On Retevis RB91 and RB24

1. Do the RB91 and the RB24 need a license to be used?

Yes, since they use 400-470MHz frequency, they require an amateur operator license.

2. If I buy two sets, can two RB91 and four RB24 be connected on the same channel?

Yes, two RB91 repeater and four RB24 handheld radios can all be connected on the same channel, as long as they have the same channel and frequency. In addition, RB91 and RB91 can also communicate with each other.

3. Is RB24 a digital or an analog radio? Does it have an encryption function?

RB24 does not have encryption capabilities. It is a digital radio that uses the LoRa (Long Range) modulation, which is different from the DMR modulation. Only devices with the same LoRa modulation can communicate with each other.

4. Which cable is required for programming the RB91/RB24?

A C9018A programming cable is included in the set for programming both the RB91 repeater and RB24 handhelds.

How to program RB91/RB24: Plug the programming cable into the headphone jack (Kenwood 2-Pin). Press and hold the PTT button for three seconds and turn on the radio simultaneously. The green light will flash three times to enter programming mode. Next, connect it to the PC for software programming.

Please note: After choosing the serial port, you need to click "Open Port". You only need to enable the relay function of one of the RB91/RB24, and select "Close" for the relay function of the other radios. Otherwise, the signal will be continuously relayed and cannot be received. After programming, turn the radio off and restart it. 

5. Can the RB91's 12V (solar) charging port be connected to a 12V car battery for power?

You need to have a power panel in the car (the maximum voltage supports 18V) to connect it; it cannot be connected to the car. The universal DC3.5 interface solar panel can be used to charge RB91.

6. What type of solar panel is required for charging the RB91?

You can charge the RB91 with an external 18V, 600mA solar panel. (Note: The solar panel is not included with the repeater and must be purchased separately.)

7. Can I rely on solar charging for long-term use of the RB91?

Solar charging is only intended for short-term emergency use. It is not sufficient to power the RB91 for long-term, daily operation. For consistent and reliable performance, it is recommended to keep the battery fully charged via the main power supply.

8. Can an external mic be connected to the RB91?

Yes, the RB91 has a Kenwood 2-pin mic jack, so it is compatible with most Kenwood 2-pin speaker mics, such as the C9001A.

9. Is the RB91/RB24 set in stock and ready for shipment?

Yes, both the RB91 repeater and the RB24 handheld radios are in stock. We will process the order and ship it out within 3 working days. When the order is shipped out, you will be informed of the tracking number via email.

Thank you for reading this blog! If you have any questions, please leave your comments below. We are looking forward to your comments!

Related Blog: FAQs on Retevis RB91 and RB24 Long Range Radio Communication Solution-Part 1