Station roster · Fully supported
Unihertz Atom XL
A compact UHF DMR and FM phone whose radio sits behind a USB bridge; tested for receive and transmit.
| Feature | Result | Notes |
|---|---|---|
| Signal meter | Partly | Holds its last reading during a reception, by design |
| FM receive | Works | |
| FM transmit | Works | |
| DMR receive | Works | Group and private calls with caller ID |
| DMR transmit | Works | |
| DMR texts | Works | Both ways |
| M17 receive | Partly | 71 to 89 of 100 frames exact on test recordings |
| M17 transmit | No | Needs module firmware this radio cannot load |
| APRS | Works | Receive and send |
| SSTV | Works | Receive tested |
| FT8 over FM | Works | Receive tested |
| POCSAG pager | No | Needs module firmware this radio cannot load |
| Band scope | Works | Inside 400 to 480 MHz |
| Module firmware loader | No | The module sits behind the USB bridge |
| Android Auto | Works | Tested on the desktop head unit |
| SignalDeck Web | Works |
UHF only
The radio covers 400 to 480 MHz. There is no 2 m, no NOAA weather radio and no 2 m satellites.
No USB data while the radio is on
The radio is a USB device on the phone's only USB controller. While SignalDeck has the radio on, a computer cannot use the USB cable for data (adb, file transfer). Exit and Hand back switch the radio off and give the USB port back. Developers work over Wi-Fi ADB.
The signal meter pauses during a reception
Any command sent across the USB bridge while audio streams can break the audio. So during a reception the S-meter shows the reading from just before it and moves again when the reception ends. Fox hunt and coverage logging still take readings, which may cost a short drop-out.
A nearby transmitter deafens it
Another radio keying close by, even on a different UHF frequency, pushes this receiver down to the bottom of its range for the length of that key. It recovers at once when the other radio stops, and it does not fake a reception.
The reception signal can stick
Rarely, the bridge's reception start and end signal stops for a whole session. SignalDeck notices, finds receptions from the signal reading instead and restarts the bridge once; a phone reboot always clears it.
Short audio drop-outs
The bridge's USB audio can stop for about 2 seconds. SignalDeck restarts the bridge, which costs a few seconds without sound.
Switch off App block
The phone's App block setting force-stops SignalDeck 5 minutes after the screen goes off. SignalDeck opens that settings page once so you can switch it off for SignalDeck.
Charger noise
With a charger on the USB socket the idle signal reading rises by a few dB. Reception detection copes with it.
- Idle signal reading
- -101 to -103 dBm, about -98 dBm with a chargerTest unit, 2026-10-29.
- Audio clock
- about 125 ppm fastThe bridge's sound card; the M17 calibration accounts for it.
- Hand back
- about 20 sSignalDeck checks the bridge answers before handing the radio back.
- Radio owned after a reboot
- about 67 sWith Own the radio at boot switched on.
- Receptions without drop-outs
- 17 of 17RTTY and speech test transmissions with the signal meter held during receptions (2026-10-29).
- Stock
- DMR006.U4A.V067
- Notes
- SignalDeck cannot load module firmware on this phone; the module is behind the USB bridge.