New Model #9958
closedRetevis RT40B
Added by tyler two over 2 years ago. Updated about 2 years ago.
100%
Description
I have a 10 pack of RT40B FRS radios. I'm waiting for a programming cable - it uses a TRRS jack into the phone. I will step through some of the existing Retevis radio, including the RT22 FRS.
I don't know if it is a clone of some other radio.
Happy to ship one domestically in the U.S. to support the effort!
Files
| native-app.txt (4.7 KB) native-app.txt | Retevis programming app USB serial output | tyler two, 08/02/2022 04:48 AM | |
| chirp.txt (1.11 KB) chirp.txt | Chirp app USB serial output | tyler two, 08/02/2022 04:48 AM | |
| Retevis - RT40B.pcapng (100 KB) Retevis - RT40B.pcapng | Retevis programming app wireshark dump of usbmon | tyler two, 08/02/2022 04:48 AM | |
| Retevis_RT40B.img (517 Bytes) Retevis_RT40B.img | CHIRP Radio Images (*.ing) file from RT40B | Jim Unroe, 10/08/2022 07:33 PM |
Updated by tyler two over 2 years ago
BTW I would just gift the radio, not loan it. Why send back a cheap radio? Ha
Updated by tyler two over 2 years ago
I was unable to get it to work with the existing Retevis presets for similar-seeming radios. I'm willing to ship a radio out to someone or to step through some more basic attempts at things - Would running the official software and somehow sniffing the USB TTY traffic help anyone?
Updated by Jim Unroe over 2 years ago
- Status changed from New to Feedback
It appears to be a model that may have some similarities with a pair of models that are supported by the retevis_rt21.py driver. I could take a look at it but I make no promise as to when a working driver can be made available or if a working driver can be provided at all.
Jim KC9HI
Updated by tyler two over 2 years ago
- File native-app.txt native-app.txt added
- File chirp.txt chirp.txt added
- File Retevis - RT40B.pcapng Retevis - RT40B.pcapng added
I am not a programmer and I certainly don't know much about serial I/O, but I used the info you provided and took a stab at adding a device config section....
The "magic" that the Retevis programmer outputs seems to be:
_magic = "PHOGRH" + "\x5c"
but when Chirp does the subsequent serial.read(1) it is getting back "P", and if it reads more characters (because of course I did read(100))it receives PHOGRH. It looks like this radio has remote echo? I noticed if I open a serial terminal to the radio and type, I see my characters on the screen, but it stops when I turn the radio off.
Looking at the structure of this driver, I'd say that puts this into a totally different class - it doesn't look like this echo behavior is handled by the simple per-device configs.
See attached dump of /sys/kernel/debug/usb/usbmon/3u output and a wireshark capture.
I totally understand the limitations of free software and I don't have any expectation of entitlement to your time. But let me know if I can do anything to assist.
Updated by Jim Unroe over 2 years ago
I agree with your assessment regarding the "magic". Obviously, without a radio I cannot tell that the radio echos back any characters. There are at least 2 other Retevis models that I have done that have an echo behavior so this shouldn't be a problem. But this is as far as I can get without physical access to a RT40B. Sorry.
Jim KC9HI
Updated by tyler two over 2 years ago
I understand, I'm totally happy to send you a radio, just let me know how.
Updated by Jim Unroe over 2 years ago
I got in touch with my contact at Retevis and we are ironing out the details of them providing me with an RT40B for development purposes.
Jim KC9HI
Updated by Jim Unroe about 2 years ago
- Status changed from Feedback to In Progress
- Assignee set to Jim Unroe
- Target version set to chirp-legacy
An RT40B for development purposes was supplied by Retevis.
Jim KC9HI
Updated by Jim Unroe about 2 years ago
- File Retevis_RT40B.img Retevis_RT40B.img added
Add CHIRP Radio Images (*.img) file.
Jim KC9HI
Updated by Jim Unroe about 2 years ago
- Status changed from In Progress to Resolved
- % Done changed from 0 to 100
Patch submitted. Support will be in the next CHIRP daily build following acceptance.
Jim KC9HI
Updated by Anonymous about 2 years ago
- Status changed from Resolved to Closed
Applied in changeset commit:af7528fc29c4.