Configure your radio,
right in the browser on any OS

RadioCloud is a set of radio tools built as a personal hobby project. The first one is a TX frequency lock: plug in the programming cable and set the transmit range right on this page. There is nothing to install — it works in the browser on any operating system.

Author on QRZ.com ↗︎

Choose your radio

Each model is configured differently, so each has its own tool. See all supported radios and features →

Baofeng UV-5R radio
UV-5RBaofeng
VFO limits · Enter the VHF/UHF transmit lower and upper limits directly, or turn off transmit per band.
Supported
Open →Quansheng UV-K5(8) radio
UV-K5 seriesQuansheng
F-Lock · Pick one of the F-Lock presets (CE, FCC, GB, etc.) on the UV-K5, K6, K1, 5R Plus and related radios such as the Radtel RT-590 and RT-600, and turn off the extended transmit switches.
  • UV-K5 / UV-K5(8)
  • UV-K6
  • UV-K1
  • UV-5R Plus
  • UV-K5 V3 / 5R Plus (new)
  • Radtel RT-590
  • Radtel RT-600
  • Retevis RA79
  • MaxTalker TK-6
Supported
Open →Baofeng UV-5R Mini radio
UV-5R MiniBaofeng
Model type · Locks the transmit bands by changing the model type (CE, EuropeCEGT, etc.) the same way the manufacturer's FreqRangeTool does.
Supported
Open →

How it works

  1. Plug the USB programming cable into the radio and turn it on.
  2. Read the current settings and save an original backup file (.img) to your PC. It opens in CHIRP.
  3. Set the transmit range. On the UV-5R you enter the lower/upper limits; on the UV-K5 series you pick an F-Lock preset.
  4. Write it to the radio, then read it back to confirm it was saved.

Ground rules we built in

  • Nothing beyond the radio's supported range. On the UV-5R you can only enter values within the factory default range, and on the UV-K5 series you can only pick presets within it. “Unlock All” and turning on the extended transmit switches are blocked.
  • The write button stays off until you save a backup.
  • Only the limits change. On the UV-5R, the values just read are written back as they are with only the limits changed, the same way CHIRP does. On the UV-K5 series, only the 128-byte block that contains F-Lock is written, in the same size CHIRP uses. The calibration area is never touched.
  • Nothing unknown gets written. Unconfirmed firmware or memory layouts are read/backup only.
  • Tested on real radios. The UV-5R and UV-K5(8) were verified on real hardware with read, write and read-back. For the UV-5R Mini, the manufacturer's tool was analyzed, the same method was used, and the transmit restriction was confirmed on a real radio. Compatible models such as the UV-K6, UV-K1 and RT-590 were confirmed to work the same way by analyzing the manufacturer firmware.

Technical notes

Research into what differs between firmware and memory layouts for each radio.

Baofeng UV-5R radio
UV-5R differences by firmware and memory layout
Where and how the transmit limits are stored depending on the firmware version of Baofeng UV-5R radios, and how RadioCloud handles each case.
Updated 2026-10-09 · Korean only
Read →Quansheng UV-K5(8) radio
UV-K5 series: compatible models and F-Lock differences by firmware
How the F-Lock value is interpreted by different firmware on the Quansheng UV-K5(8), UV-K6, UV-K1, UV-5R Plus and related radios such as the Radtel RT-590 / RT-600, based on the firmware code.
Updated 2026-10-12 · Korean only
Read →Baofeng UV-5R Mini radio
UV-5R Mini model type and factory area analysis
Where and how the transmit bands (model type) of the Baofeng UV-5R Mini are stored, from an analysis of the manufacturer's FreqRangeTool, and how RadioCloud handles it.
Updated 2026-10-09 · Korean only
Read →