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Friday, 2 February 2018

ASELP vocoder

The ASELP vocoder is commonly known in the western world as being used in dPMR radios. It was developed in China as a competitor to the very popular AMBE+2 vocoder which is the standard vocoder for DMR, dPMR, and P25 Phase 2.

There is not a lot of information on this vocoder available online, so I have attempted to translate the journal article explaining ASELP from Mandarin Chinese to English. I have translated this with Google translate, some common sense, and some knowledge of radio, but if you think of a better translation for any sentence then let me know and I'll edit it if I agree with you.

Some things didn't translate very well and I have left them to allow readers to interpret the correct meaning, if possible.

If you know Mandarin and English and could help improve the translation then please leave a comment or contact me.

The original document in Mandarin Chinese can be viewed here.

Wednesday, 31 January 2018

dPMR and DMR Tiers and modes explained

dPMR and DMR are two completely separate and different standards but many people are confused by them because of the terminology used around them. In this post I will explain the terminology and hopefully stop any further confusion. Both of them are digital standards, just like P25, NXDN, D-STAR, TETRA, TETRAPOL, OpenSky.

They both use the same vocoder, but this does not mean they are compatible, because they use different bandwidths and simply because they are different standards. It's just like comparing Russian and English. Even though they use the same parameters (the human voice), they are different languages so will not be able to talk together.

The tiers are not related between different standards. Do not try to equate tier 2 DMR to tier 2 dPMR.

Wednesday, 6 December 2017

Kydera DP-550S info and downloads

Instructions for programming
For earlier radios you will need the earlier programming software. If you try one version and it doesn't work (it will give an error like "Agent id not match") then try the other one instead.

So try to read the radio first before putting any information into the codeplug. If you can't read it with the software you downloaded then use the other one.

Tuesday, 28 November 2017

Comparison of DMR radios

Sharing this? Please link to this page instead of copying because I will be regularly updating this table with new radios and new data.

If you spot any errors or out of date information or if you have more information to add, please leave a comment below or send me an email. Check contact page for details. Anything with a ? in is something I don't know. If you do, then please help by telling me. If I have missed out any Chinese DMR radios please tell me in the comments.

Information in this table is not guaranteed. I have made my best effort to provide correct information but there could be errors. Please check before buying, and if you find a mistake please let me know.

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