Search found 53 matches

by do1jml
Tue Feb 21, 2023 3:44 pm
Forum: Baofeng DM-1801 specific
Topic: [Radio model not supported] New Baofeng 1801 won't enter in upload mode
Replies: 62
Views: 35712

Re: [Radio model not supported] New Baofeng 1801 won't enter in upload mode

Some info on that radio with the Auctus chip, which may be of interest to GD77 users: the battery looks as it could be compatible, it actually fits in and can power the GD77, but does not lock. The contact plate is a tiny bit too thick for the battery to fit in the GD77 all the way. Other info, whic...
by do1jml
Tue May 18, 2021 6:54 am
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

So I'm not sure how you are going to talk to anyone else unless its via simplex I understand the "chicken and egg" problem, but projects need to start somewhere. For example, I am building a mcHF transceiver right now, because it natively supports freeDV/codec2 (on its arm processor). I don't expec...
by do1jml
Mon May 17, 2021 9:34 pm
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

VK3KYY wrote:
Mon May 17, 2021 9:27 pm
The binary sections contain all sorts of code and data, not just the codec, but its all mixed together like its been in a blender.
OK. Then the answer to the question is "very difficult to do". Thank you.
by do1jml
Mon May 17, 2021 8:11 pm
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

Thank you for the answer.

I thought that the original firmware used quite a bit of memory space for the Chinese language. Is that still in the openGD77 version? If yes, maybe some space could be freed?
by do1jml
Mon May 17, 2021 5:29 pm
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

Use the source, Luke! ;) Obviously, all questions asked on any forum can be answered by "read the fine manual". But I would expect that someone who has actually worked with the firmware code base could answer that particular question relatively easily: "would it be doable to replace the binary blob...
by do1jml
Mon May 17, 2021 5:21 pm
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

ve7mdt wrote:
Mon May 17, 2021 3:12 am
Is the expired one for the original AMBE or the AMBE+2 ? I am not sure if there is just 1 version?
The expired patent is for the AMBE codec, the one used in the D-Star protocol. The patents for the AMBE+2 are still valid, but will lapse eventually.
by do1jml
Sun May 16, 2021 6:53 am
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

In answer to do1jml. There is no special hardware for the codec. It is run on the arm processor by the binary blobs. (we assume this is licenced code from DVSI but we have no way of confirming this). Thank you for the info. Is the interface to the "binary blob" documented in the code? How difficult...
by do1jml
Sat May 15, 2021 5:30 pm
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

I'm afraid that it's not possible, because the algorithm is patented, and you can't reimplement it neither by HW or by SW means unless you have an agreement with the patent owner. First, the original patent for the ambe codec (US6199037) is expired and, second, the DMR standard does not mandate the...
by do1jml
Thu May 13, 2021 6:28 am
Forum: General discussions
Topic: Recent versions of firmware will be removed
Replies: 100
Views: 51227

Re: Recent versions of firmware will be removed

Sorry to come to that subject again. Am I right in my understanding that the present GD-77 firmware includes a binary blob from the manufacturer and that this blob corresponds to the voice codec (ambe2+)? That means that the code to compress and decompress audio data runs on the MK22FN512 ARM proces...
by do1jml
Tue May 11, 2021 6:21 am
Forum: General discussions
Topic: can't hear most transmissions. why?
Replies: 11
Views: 5281

Re: can't hear most transmissions. why?

I can hear some OM's but quite often,the green LED comes on, indicating some activity but I can't hear anything. I tried monitor mode (promiscous mode) on as well but that doesn't change anything. There may be non-voice activity on the repeater. A check on the local repeaters with a SDR shows them ...