Radtel RT-4D - a small radio with alternative firmware

[crazy4volvo]

Hi Hannes,
could it be possible to support Radtel RT-4D/IRadio DM-4R with a beta firmware from Dual Tachyon? There is a big problem with original CPS, as DT's fw has a lot of new functions, config items and key bindings which makes the CPS incompatible and unusable with beta. The community around this fw is quite active and I'm pretty sure there will be a lot of interest and support for qdmr. 73 de SP5LU

[allesand]

There is an issue for the radio at #660
@crazy4volvo : Maybe this discussion started earlier, but for the beta firmware there is https://github.com/jcalado/rt4d-cps ?

[crazy4volvo]

Yes, things changed a lot since May 2025. Joel wrote the CPS and keeps it up to date with DT's beta fw ideas, original CPS has improved too. So probably there's no need to support RT-4D in qdmr.

[allesand]

@crazy4volvo : From what I understood, Joel's CPS does not support the stock firmware, does it? When I tried (with older stock, I think 3.14), it could read but did not write correctly, probably since Radtel keeps changing the codeplug format of the stock firmware..
Yes, I have seen worse CPS, esp. the OpenGD77 import of the Radtel Windows CPS for the RT-4D came in handy. But @hmatuschek put possible support for the RT-4D on the roadmap in #660, so I can offer testing and reporting when time comes around..

[hmatuschek]

The next release will be version 0.14.0 including support for DM-32UV. The support for RT-4D is planned for 0.15.0. I will likely focus on the stock FW.

[allesand]

Ping @crazy4volvo : you might want to try https://github.com/hmatuschek/qdmr/tree/fix-rt4d-interface if on stock firmware