Single Frequency Two Time Slot DMR Repeater
DMR Single Frequency Repeater
This example uses the AnyTone AT-D578 mobile with Anytone AT-D878 portables.
Reference website: https://wyomingsurvival.org/2022/12/23/anytone-at-d578uv-single-frequency-dmr-repeater-function/
Be sure to follow local VHF or UHF simplex channel assignments (and avoid operations in any of the satellite bands).
This system does not have any call sign identifier on the mobile repeater station. Please ID the repeater in accordance with your country's regulatory requirements! If a specific identifier function/type must be used in your country for mobile repeaters -- follow your local regulations and not this guide...
System was tested with all radios in low TX power setting. Use care not to overheat your AT-D578 if running higher transmit power levels at the mobile repeater. (The TX duty cycle is slightly less than 50% for the DMR repeater, but high throughput / repeated traffic levels may lead to heat build-up over time with continuous use.)
AT-D578 setup to be a single frequency DMR repeater, receiving on TS1 and retransmitting on TS2
Tested on firmware 2.08.
Put the AT-D578 into dual A/B display mode (A on top, B on bottom)
Select VFO mode and set both VFO on selected simplex channel (440.925 MHz).
Select VFO A to be on TS1
Select VFO B to be on TS2
Settings > 2 Channel Set > 9 TalkAround Off
Settings > 2 Channel Set > 24 DMR Mode > 3 DCDM/Dual TS
Settings > 1 Radio Set > Other Func > 23 Repeater > 2 Repeater On
Note the AT-D578 microphone and PTT controls are disabled while in radio repeater mode (menu controls on both handset and on radio work).
Mobile is now setup to operate as a single frequency dual-time slot DMR repeater.
To disable repeater operations, select Menu > Settings > 1 Radio Set > 4 Other Func > 23 Repeater > 1 Off.
AT-D878 setup (single frequency, receiving on TS2, transmitting on TS1)
Tested with Firmware 3.06
Color codes for both radios on CC1 << can be different, but needs to be the same on all accessing radios.
Talk group for both radios on Talk Group Simplex (9) << can be different, but needs to be the same on all accessing radios.
VFO mode A, 440.925 MHz, TS2 indicated
Settings > 2 Chan Set > 16 R&T CC > 2 CC:1
Settings > 2 Chan Set > 17 Time Slot > 2 TS 2
Settings > 2 Chan Set > 26 DMR Mode > 3 DCDM TS split (This sets radio to TX on S1 and RX on S2)
Settings > 2 Chan Set > 9 TalkAround Off (Must be off for this to work)
Radio must show T2 for time slot when in receive mode. Radio transmits on T1 and receives on T2 when setup properly.
Single Frequency / Dual Slot Repeater Operations:
Observe the front of AT-578 mobile while transmitting on one of the AT-D878 portables. The mobile’s signal reception indicator should turn orange in color while receiving and repeating the received signal from T1 to T2, then briefly turn red at the end of the transmission before turning off. When repeating signals, a small red TX indicator will illuminate on the upper right portion of the B-channel display. This turns off when the repeater is not receiving/re-transmitting signals.
Note the AT-D578 microphone and PTT controls are disabled while in radio repeater mode (menu controls on both handset and on radio work).