Kydera DR-880UV Plus / Radioddity GD-88 firmware

This post was originally intended to be a repository of firmware for the DR-880UV Plus radio since Kydera does not have a page on their website like other manufacturers do to provide updated firmware. However, now that Radioddity has started publicly releasing new firmware that works on both brands, I've started using it to provide more details on their newest firmware.

If you want to share the any of my downloads (not the ones on Radioddity's website), please link to this page rather than the mega.nz link directly because I will update it with new ones in the future.

How to use

To apply the firmware you need the IAS software and the programming cable. Turn off the radio, connect it with the programming cable and then turn on the radio while holding the top side button. It should show a different screen from normal with A or B on the top. You can change between A and B by holding the top side button again.

Then use the IAS software to load in the A firmware with A on the screen of the radio. Switch it over to B and then load in the B firmware. Each firmware package should have two files in - one for each of A and B.

Versions

September 2022 Version

Screenshots of radio (one for each VFO. The firmware is different for each):

It's interesting to note that this version says GD-88 V1.0 at the top line when opening the versions on the radio.

Issues I've found with this firmware:

• Volume is way too loud even on minimum.
• Screen backlight setting (BL Switch) keeps resetting itself to BL ON after I set it to auto.
• Wrong ham contact shown. If two people are talking it keeps showing the details of the first one.
• VFO B keeps changing its step back to 5kHz. I've changed it to 6.25kHz about 10 times now.
• Recording feature just stops recording even though it's still turned on in the menu. Can't get it to resume recording even if I turn it off and on.
• The Single frequency repeater (SFR) is buggy. Half the time it doesn't pass audio. It always sounds muffled and quieter than the original audio so it seems like it's being transcoded even though it shouldn't be.
• Analog APRS can lock up the radio and it continues transmitting until you pull the battery out. I think this occurs if the message you set is too long.

Download link

October 2022 Version

This one is from Radioddity and shows as Oct 27/28 when loaded to the radio. It still shows as GD-88 V1.0 though. It works on the DR-880UV/Plus.

Changes:

• They've changed the version display so you can see the version of both A and B VFOs on one screen now (instead of two separate screens like in the photos for the previous version). 
• Includes talker alias! Excellent feature so you don't have to load the ham contacts database and keep it updated. The radio will now transmit and receive talker alias on DMR.

Download direct from Radioddity: https://www.radioddity.com/pages/radioddity-download

Click on the GD-88 then download 2022-10-28 Firmware B49E.D64.EHRSAB.007.

November 2022 Version

Changes:

• Supposedly fixes the ham contacts database. I've loaded the firmware onto my radio and it does seem to be better. It would previously get stuck on one contact and show that contact for everyone else until you restarted the radio.
• Adds support for programming cables based on the FTDI-chip. Most people won't notice the difference but if you had a programming cable you thought should work but didn't, it might now work after updating the radio to this firmware. The problem is you'd need a working cable to update the radio first anyway.
• "minor fixes within the Talker Alias display". Not sure what Radioddity meant with this one. It seems to be working just the same for me. They didn't provide any more detailed information about what they fixed.
• "Assignment of 1450 Hz Pilot tone fixed (does require at least CPS 3.3 DMR CPS_DRS [9.2.16])". Again not much detail provided by Radioddity on this one. I'm guessing the 1450 Hz tone which is needed to speak through some analogue repeaters wasn't working before and now it is.

See Radioddity's page on it here: https://www.radioddity.com/blogs/all/bugfix-for-radioddity-db25-d-and-gd-88

I think I heard someone mention in a discussion that if you put this firmware on a Kydera radio it will brick the radio (make it stop working), but it works fine on my Kydera DR-880UV / Plus. I'm guessing if you have the non-plus version (Kydera DR-880UV) it would probably not work.

Download direct from Radioddity: https://www.radioddity.com/pages/radioddity-download

Click on the GD-88 then download 2022-11-20 Firmware B49E.D64.EHPSAB.010.

March 2023 version

Changes:

• DTMF is supported now
• Single VFO mode added
• "DMR-audio level aligned to analog-audio level" Still too loud on both at minimum volume.
• Talkgroup will be received now if programmed as the contact for a channel
• "Current entry of menu or submenu and the total number of entries are displayed in the upper right corner above each other" Still hard to use. They should just replace it with an extremely simple text based menu.
• "RXGroupList’ menu within ‘Device Info’ now displayed correctly" To be honest I hadn't noticed there was an issue with this before.
• A few other minor things. You can see the rest in the release notes provided within the update package.

I actually made an update video based on the state of the radio with this firmware update applied:

Download direct from Radioddity: https://www.radioddity.com/pages/radioddity-download

Click on the GD-88 then download 2023-03-30 Firmware. Or direct download link here.

June 2023 unofficial version

This is not an official Radioddity or Kydera released firmware. This is one I got sent by a radio dealer I know, who got it direct from Kydera after he showed them my videos complaining about the radio's problems. They made this firmware to address one of those problems. 

I expect they will include the changes in the next official firmware release.

Use at your own risk! I have tested this on my own radio and it worked fine, but I don't take any responsibility if it causes issues with your radio!

Changes:

• Analog and digital audio are now at a much lower volume when the volume is set to the minimum level.
• There may be other changes - I haven't tested everything and no changelog was provided by Kydera.

Download link had to be removed after a request from Kydera to take it down. It turned out they had used the radioddity model number (by mistake I think) in this firmware even though they sent it out via Kydera. I think that's why they wanted it not to be shared anymore (but I'm not 100% sure). The Late June 2023 version below seems to be almost the same anyway so if you were looking for this update then just use that one instead.

Late June 2023 version

This one is an official Kydera firmware. I've had one person verify it also works on the Radioddity GD-88 which is usually the case with all of these firmware releases.

This has just come out on 03 July 2023 even though the date in the versions info shows June.

Changes:

• Analog and digital audio are now at a much lower volume when the volume is set to the minimum level.
• There may be other changes - I haven't tested everything and no changelog was provided by Kydera. Please let me know in a comment or by contacting me using any of the details on my contact page if you find other changes from the last firmware.

This is an official release this time (so I shouldn't be asked to remove it), so here's the download link.

Comparison of digital PMR446 radios. dPMR446 and DMR Tier 1.

Old radios:

Radio model	Digital mode	Approx. price	Waterproofing	Notes	Availability
Icom IC-F4029SDR	dPMR	-	None	First digital PMR446 radio.	Discontinued. Icom recommends IC-F29DR2 instead.
Icom IC-F29SDR	dPMR	-	IP67 (submersible)	Icom IC-F29DR with display.	Not officially discontinued but availability is poor
Icom IC-F29DR	dPMR	-	IP67 (submersible)		Discontinued - Replacement is Icom IC-F29DR2
Kenwood TK-3401D	dPMR	-	IP54 (splashproof) & IP55 (water jets)		Discontinued - Replacement is Kenwood TK-3701D
Kenwood TK-3601D	dPMR	-	IP67 (submersible)		Not officially discontinued but availability is poor
Motorola XT660d / XT665d	dPMR	-	IP55 (water jets)	Motorola's first and only digital PMR446 radio. XT665d includes LPD channels (low power, not PMR446 and they have worse range so not much benefit of having these channels). The dPMR association claims that this is not a dPMR radio, but I received a recording of the digital signal from someone who says they have this radio and it decoded using some software that decodes dPMR signals, so I think the dPMR association are mistaken and it is a dPMR radio (maybe just not certifiied by them).	Discontinued - No replacement. Motorola only sells analogue PMR446 radios now.
Hytera PD355LF	DMR	-	IP54 (splashproof)		Discontinued
Hytera PD365LF	DMR	-	IP54 (splashproof)		Discontinued
Icom IC-F29DR2	dPMR	-	IP67 (submersible)	Programming cable is about £50 and software (CS-F29DR2) is about £24.	Discontinued. Replacement is IC-F29DR3.

Current radios:

Radio model	Digital mode	Approx. price	Waterproofing	Notes	Availability
Icom IC-F29DR3	dPMR	£192	IP67 (submersible)	Programming cable is about £40 and software (CS-F29DR3) is apparently available from dealers. Icom says software from the last model (the IC-F29DR2) is not compatible so you have to buy new software (which is rather a shame because the radios appear to be functionally identical with the DR3 only having a more powerful speaker).This radio seems a good choice.	Good availability
Kenwood TK-3701D	dPMR	£145	IP54 (splashproof) & IP55 (water jets)	Programming software is about £20 and cable is generic kenwood style so many can be found cheaply. Range test video. A good choice.	Good availability
Alinco DJ-PAX4	dPMR	€180	IP67 (submersible)	Programming software freely available online. Cable looks to be kenwood style so should be cheap. Seems like it could be a good choice.	Good availability in EU only
Wouxun KG-D26	dPMR	€199	IP54 (splashproof)	Programming software freely available online, but it shows that it doesn't use common IDs as is recommended for dPMR446 equipment (so programming is more complicated). May work fine just for groups who will only use this radio out of the box and not need to reprogram to talk to other dPMR446 radios. At the price I wouldn't recommend it and would just go for the Kenwood instead if you only need IP54 rating.	Good availability in EU only
Dynascan DA-350	dPMR (AMBE+2C)	€175	IP67 (submersible)	Uses AMBE+2C vocoder (not the standard AMBE+2 that most other radios use) so will not be compatible with other radios, except in analogue mode. Looks like a rebranded cheap Chinese radio so probably not as good quality as other brands. Could not find it available in the UK so price is in euros.	Good availability in EU only
Hytera BD305LF	DMR	£97	IP54 (splashproof)	Not so good build quality and uses DMR mode so worse range than dPMR. Not recommended.	Good availability
Hytera BD505LF	DMR	£153	IP54 (splashproof)	Not so good build quality and uses DMR mode so worse range than dPMR. Not recommended.	Good availability
Hytera PD505LF	DMR	£178	IP54 (splashproof)	Seems better build quality than Hytera BD series. Uses DMR mode so worse range than dPMR.	Good availability
Hytera BP515LF	DMR	£144	IP54 (splashproof)	Uses DMR mode so worse range than dPMR.	Good availability

My recommendations

For PMR446 use, dPMR is better for most users because it uses 6.25 kHz channels rather than 12.5 kHz. DMR has to do some trickery to allow the same effective number of channels (32) which not all radios do, whereas with dPMR there are 32 channels by default. dPMR mode also gives better range. For these reasons I recommend people pick dPMR radios over DMR when choosing digital PMR446 walkie talkies.

I also don't recommend the Dynascan DA-350 because it looks like a rebranded cheap Chinese radio so the quality is dubious and it won't work with any other dPMR radios (unless they happen to use the same non-standard vocoder). I have the Kenwood TK-3701D and I can recommend it. It works very well and is much better value for money than the Icom if you don't need IP67. I haven't tried the Icom IC-F29DR3 or the Alinco DJ-PAX4 but they also look like good options especially if you need IP67 rating since the Kenwood is only IP55. Out of the Icom and Alinco I'd probably go for the Alinco because it has programming software that is free and the Icom programming cable is expensive.

If you find any radios I've missed off this page or if any information is out of date, please leave a comment (or email me using the details on my contact page) so I can update it.

This page was last updated 02/07/2023.

Chinese dPMR radios comparison

Names	Type	Vocoder / Vocoders	Availability	3.125 kHz steps	Compatibility group	Notes
Puxing PX-508D, Puxing PX-558D, Radtel RT-14D, NRC DigiA	Handheld, no display or keypad	AMBE+2C	Poor	Yes	1
Zastone ZT-9908	Handheld, display and keypad	AMBE+2C	Poor		1
TYT DM-UVF10, Retevis RT2	Handheld, display and keypad	AMBE+2C	Poor		1
Puxing MD-500	Mobile	AMBE+2C	Poor
BFDX/Belfone BF-P108	Handheld, no display or keypad	RALCWI	Poor
BFDX/Belfone BF-P118, Luiton DG-1180	Handheld, display and keypad	RALCWI	Poor
Kirisun S780, Kirisun FP460	Handheld, display and keypad	ASELP	Poor	Yes	2	Poor range - bad receiver sensitivity.
Kydera DP-550S	Handheld, display and keypad	AMBE+2C, ASELP	Poor	No. Rounds to nearest so 446.103125 becomes 446.1		Terrible audio quality - very muffled sound. Does not work with other dPMR radios.
Recent RS208D	Handheld, no display or keypad	ASELP	Good		2
Recent RS209D	Handheld, display and keypad	ASELP	Good		2
Recent RS308D	Handheld, no display or keypad	ASELP	Good		2
Recent RS309D	Handheld, display and keypad	ASELP	Good		2
Sainsonic FM-416, HYND DP320	Handheld, no display or keypad	Probably ASELP	Poor
Recent RS-619D	Handheld, display and keypad	Probably ASELP	Good
HYND DP330		ASELP, AMBE+2C	Good
HYND 500(DPMR)		?	Good			Be careful, they also sell a DMR model of the same radio with the same model number.

Vocoder
The vocoder is the part of the radio that converts your voice into very low bitrate digital data so it can be sent over the radio channel efficiently. Each vocoder will sound different because they make different sacrifices to compress the voice. I wrote a page about different dPMR vocoders here. Some radios are available with multiple vocoders so you have to make sure to get the right one. The only way to tell is usually by trying it, or sometimes the seller or manufacturer will be able to tell you. They often don't know much about their products though.

3.125 kHz steps
For a radio to work on dPMR446 channels it needs this. If not, it will be on the wrong frequency. The radios on this page are not legal to use on PMR446, however it is pretty common for people to program chinese radios to use PMR446 frequencies and as long as you fit in by using the right frequencies and bandwidth then it probably won't be noticed. Therefore, if you're planning to use one of these radios on PMR446 digital frequencies then you should get the one with 3.125 kHz steps.

Compatibility group
This is a term I just made up for this page. Radios in the same compatibility group should be able to talk to each other. This is not guaranteed as I have not tested them all and specifications (including vocoder) are sometimes changed even for the same model number.
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If you're trying to buy any of these radios, aliexpress, eBay and alibaba are usually good places to search. eBay is usually the easiest as they will post from your country but only the most popular radios usually get listed there. Aliexpress is the next best but they post from China so it may take a long time to arrive. I have linked some of the names to the product page on aliexpress.

Please leave a comment below if you have information missing from this page that I can add.

Quansheng UV-R50 programming software download

I found it very difficult to find this software online so thought I'd provide an easily searchable download link. For some reason it installs itself as TG-Currency03.exe. They probably just didn't bother to rename it from a default. So you'll need to look for that to open it once installed. I suggest you rename the folder during the installation to something sensible, so you know what it is later on.

If you're going to link to the download then please link to this page as I may change the download link if it breaks, and then your link would break too.

https://mega.nz/file/ZNwRkbzI#4srxAMaqACmBZFrLeoJFWEW2kzd_Eava56Rj23o3Pu4

The original link to the Quansheng website where this file is from, is below. I provided this just in case it actually stays up and doesn't break. It might be a good idea to try this link first because it may have a more up to date version of the software. 

http://www.qsfj.com/products/459

Tuning your hotspot (Pi-Star)

Tuning your hotspot is something you should do to get the lowest BER (Bit Error Rate) - that means to get the least errors in the digital data being sent by your radio. If you have a high BER then it causes your audio to sound bad to others or even to fail to decode if it's very badly tuned.

So to do this, first open up the dashboard of your hotspot. This can be accessed at pi-star/ usually. Then click on configuration near the top right of the page.

Next, in the same area click on Expert, then MMDVMHost. Scroll down on this page to the Modem section. You should see an RX offset field.

Now, set your radio to use a talkgroup/room/reflector where you won't be disturbing anyone by transmitting. I suggest using an echo test one. On the Brandmeister network this is done with a private call to 9990.

Open a new tab in your browser and navigate back to the dashboard. When you transmit, you should be able to see it under the Local RF Activity section. If you don't then it could mean that your frequency is off by such an extent that the hotspot isn't even detecting the transmission.

From here you can start tuning up and down on the RX offset frequency. I'd recommend going up or down in 100 Hz steps at first. Each time, save the new RX offset and transmit again for a few seconds. See if your transmission comes up under Local RF Activity. Look at the BER and write it down along with the RX offset. After some trial and error, you should find an offset that gives the lowest BER. If you are still increasing/decreasing the offset and the BER keeps going down, then keep going until the BER starts to increase again. At the minimum point, you've found the correct offset.

At this point you can either tune it further, by going up and down in smaller steps than 100 Hz, or you can just stick with the current offset. I'd recommend tuning it more if you have the time.
If you choose not to tune it further, then you're done!

dPMR vocoders

Kirisun S780. An example of a cheap Chinese
dPMR radio with the ASELP vocoder

There are a number of vocoders commonly used in dPMR. For those of you who are not familiar already with what a vocoder is, here is a brief explanation: A vocoder converts the voice signal into low bitrate digital data so it can be sent over a radio channel, and then converts it back to voice at the other end. This allows the voice to be sent in less bandwidth than if some other audio codec that is not optimised for voice (MP3 for example) was used, or even than analogue modulation. A vocoder is just an audio codec that was specifically designed to be optimised for voice, and usually will not accurately represent other sounds.

The dPMR standard has two bits allocated to denoting which vocoder is in use, allowing four choices. This is specified in the dPMR Mou tech.lib-Voc Bits-v1 document. The options are:

1. (00 in binary) Standard vocoder. AMBE+2.
This vocoder is very widely used in digital PMR/LMR products including in DMR, P25 Phase 2, and NXDN. It is a solid choice of vocoder, but far from the only choice. A sample of how this vocoder sounds can be heard at the start of this video. All Icom and Kenwood dPMR radios use this vocoder and are guaranteed to work together because they have been through interoperability testing.

2. (01) Vocoder to be selected by the Chinese DRA.

According to one commenter on this article, the DRA is a Chinese entity but seems not to have produced anything since 2010. I did some further research (originally for this article) and found out that DRA stands for Digital Radio Association. It seems they originally intended to create a dPMR based radio standard called NDR, using their own vocoder. dPMR radios with this vocoder could be sold as NDR radios, presumably to assure users that they would be compatible with each other.

I could not find any information about this vocoder online. I requested information from the dPMR association and they did not know what it was either. My guess is that the DRA and their NDR project got abandoned.

If any vocoder was selected, I believe it's highly likely that the ASELP vocoder would have been the one chosen. This is because it's a Chinese developed vocoder. See more information later in this article.

If you have any further information then please leave a comment below or contact me.

3. (10) RALCWI vocoder.
I have never seen a single dPMR radio using the RALCWI vocoder. I cannot even find any samples of what that vocoder sounds like online. I contacted the company that made this vocoder, asking if they had a sample, and if they would give me permission to post it. They said that they do have a sample but that "audio samples are only made available to known equipment manufacturers with a defined relevant project." My guess is that this vocoder must not sound very good, because other vocoder makers usually want to show off how great their product sounds.

4. (11) Manufacturer defined vocoder.
This is probably the second most used choice after number 1. Although the certified dPMR radios all use the standard vocoder, many Chinese manufacturers have been using the dPMR standard to create fairly cheap digital radios, however their radios have not been certified by the dPMR association so are not guaranteed to work with other dPMR radios. The manufacturer defined vocoder is not one specific vocoder. It can be any other vocoder that the manufacturer selects.

Other Vocoders

The vocoders that I have seen in use (with, I assume the manufacturer defined setting), are ASELP and AMBE+2C. More information is given below.

ASELP
A vocoder developed by the Chinese Tsinghua university. ASELP stands for Advanced Sinusoidal Excitation Linear Prediction and is not to be confused with ACELP, the vocoder used in TETRA. This vocoder was developed because of the desire for a vocoder with intellectual property rights that were owned by a Chinese organisation. There is not all that much information on this vocoder online in English, however you can read my attempted translation of the journal article describing this vocoder.

ASELP is commonly used in Chinese made dPMR radios and sounds fairly good. A sample of the vocoder as implemented in the Kirisun S780 can be seen in this video.

AMBE+2C
This vocoder caused a bit of confusion for dPMR enthusiasts because nobody seemed to know who it was by, if it was the same as AMBE+2, or if it was just a name made up by the Chinese manufacturers to trick people into buying their radios (which would not be surprising because Chinese radios are commonly listed online with exaggerated output power and specification claims).

I contacted DVSI, the company who made the AMBE+2 vocoder to ask them about AMBE+2C. They told me that it is their vocoder. It is made as an alternative to AMBE+2 but is not compatible with it. Although I was not given pricing information, I would guess that this vocoder is cheaper than AMBE+2 and that's why it is commonly used in Chinese made dPMR radios. It is available through a software licence.

My advice
If you're looking to buy dPMR radios then I recommend that you buy radios using the standard vocoder. These are sold by Icom and Kenwood, and they are all good quality radios. The dPMR radios sold by Chinese manufacturers are cheaper, but the quality is usually nowhere near as good, and you cannot rely on them to work with each other. Even within the same model of radio, the vocoder is sometimes changed, so if you need to buy a new radio later on then you might find that it won't be able to communicate with the older ones.

Jumbospot ethernet adapter

A cheap Chinese ethernet adapter

If you're thinking of getting an ethernet adapter for your jumbospot hotspot, watch out. The cheap Chinese ones on ebay (usually marked with the number 9700) have issues. See this link for full details. The short version is that they're only USB1 so are very slow, and they have a poor design that makes them perform sub-optimally.

They still work but it might not be as good as a properly made and supported ethernet adapter. The slow speed is generally not too much of a problem since hotspots don't need to transfer data at a high speed most of the time anyway. Digital voice is low bitrate, which means it only needs low speeds.


They should work out of the box, assuming you have a relatively up to date version of pi-star installed. I had to restart the hotspot to get it to work. I also noticed the dashboard loading much quicker than on Wi-Fi so even with the slow speed and poor design, it might be better to get one of these than relying on Wi-Fi.

Still, it would be better to buy one which is properly supported, like the 3 Port USB Hub w/ Ethernet - Micro USB (Pi Zero) sold by ModMyPi, Pimoroni and other retailers.

Update (19/04/2019): After about three months of use, I haven't had a single issue with this ethernet adapter. Although in theory they might not be completely optimal, I find that in practice they work perfectly adequately for hotspots. Hotspots generally operate at a low data rate, so the fact that this product only supports USB 1 isn't an issue for this use case. I recommend this product if you want to connect your hotspot by ethernet cable for more reliable connection to the internet.

Ailunce HD1 full detailed review

Note: This review was originally made in video format (click here to watch) however I have posted it in text format as well for those who prefer to read it, or to allow readers to use automatic translation. If you want to watch the video version in your language, it has full subtitles so you can use automatic translation on YouTube.

Body of the HD1, a dual band DMR radio

Intro

If you hadn't heard of it already, the Ailunce HD1 is a dual band DMR radio that covers 136 to 174 and 400 to 480 MHz. It does both FM and DMR, as most DMR radios do. But the thing that makes this radio stand out from the other DMR radios is that it was specifically made for amateurs and has a number of features that commercial DMR radios don’t have.

Puxing PX-508D

A front view of the radio

Features
A dPMR radio with IP67 waterproof rating available in UHF or VHF. Capable of doing 3.125KHz steps which means it could be used on certain channel allocations such as the dPMR446 licence free channels in Europe. However, this radio would not be legal on those channels due to the power output which is over 0.5W.

As with many Chinese radios, this radio can be customised by the factory with your own brand. It is also sold as:

• Radtel RT-14D
• NRC DigiA

Please leave a comment if you know any other names this radio is sold under (or to add to any other information in this post).

Note: There is also the Puxing PX-508 which is the FM only version with no dPMR. Make sure to get the version with the D on the end if you want dPMR.

The PX-558D seems to be very similar if not the same as the PX-508D.

Compatibility
Known to work with other dPMR radios using the AMBE+2C vocoder. Tested with:

• Zastone ZT-9908
• TYT DM-UVF10 / Retevis RT2
• Puxing MD-500

If you have used this radio with any other radios, please leave a comment so I can add them to the list.

Connector

The accessory connector of the PX-508D

The programming cable needed seems to be the Motorola MagOne A8 style cable, but this is not verified. It can be seen in the software that it must connect through a COM port, but some cables have the COM to USB adaptor integrated.

I have confirmed that it works with accessories with the MagOne A8 connector. For the radio to be waterproof, the cover must be on the accessory port.


Downloads
Programming software download

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.

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.

Kydera DP-550S info and downloads

Compatibility
This radio does not seem to be compatible with any other dPMR radios. The reason why is unknown. If you have this radio and have got it to work with other dPMR radios please leave a comment or contact me.

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.

Comparison of DMR radios

The date at the top is only the date this article was originally posted. It does not change when I update the post!

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

Please contribute
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.

Disclaimer
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!

Legal information
This comparison is made for licensed amateur radio operators. It is illegal to use any of these radios on licence free channels such as PMR446 or FRS (including GMRS). Radios used on FRS and GMRS must be certified for use on these channels by the FCC. Radios used on PMR446 must have 0.5W maximum output power, and a fixed antenna.

First look at the new Ailunce HD1!

This is a pretty exciting radio as it's the first radio I know of to be made specifically for amateurs. It has a VFO or frequency mode so you can just type in the frequency without having to enter it into a channel, unlike other DMR radios which were made for the commercial market.

Watch the video for more:

Baofeng UV-5S. Waterproof dual band HT programming software

I recently bought this radio to test out, and I'm quite pleased by it. It seems to work well, and I tested how waterproof it is in my video on it.

Dual band DMR radios: Ailunce HD1 and TYT MD-2017

Ailunce HD1 prototype.
Image courtesy of @l_Steven59_l

A dual band DMR radio is something that has been on many people's wish lists for quite a while now. The first dual band DMR radio to be released is the TYT MD-2017, but should you buy it now? My opinion is maybe not.

Although TYT is the first manufacturer to come out with a dual band DMR radio, it definitely will not be the only one for long.

Ailunce (part of Retevis) is working on a radio called the Ailunce HD1 which is expected to be released around mid June 2017. With the release of this radio, the TYT MD-2017 may have to drop its price to compete, so if you can wait a couple of months, you may save yourself a good amount of money.

If we look at the trend with earlier Chinese-made DMR radios such as the TYT MD-380, we see that the price started off high but decreased as more similar radios came onto the market. Especially since TYT is forcing retailers to sell the radio at a fixed price right now, the prices should come down significantly once there is some competition.

Not counting the Baofeng DM-5R and other "fake" DMR radios (see this post), the release of the Ailunce HD1 will bring the number of dual band DMR radios on the market to two, and inevitably more will follow.

Price fixing and the TYT MD-2017

A post on Trilogy's website suggests that TYT may be engaging in resale price maintenance with radio dealers in the UK and possibly worldwide. Is this legal in the UK? A review of online documentation would suggest not.

Resale price maintenance (RPM) is defined by the Competition and Markets Authority: "RPM is where a supplier and a retailer agree that the retailer will not resell the supplier’s products below a specified price."

Note: I used the term price fixing in the title of this post. Technically retail price maintenance is not the same thing as price fixing, however they are both actions that harm the consumer by causing a price not to lower with competition. Both of these practises are illegal in many countries.

Screenshot of the webpage on Trilogy's website

Decoding TETRA on Windows!

To capture the signals I was using an RTL SDR which is a very cheap device that allows you to tune to a wide range of frequencies. You can find one to buy at this link:
http://smarturl.it/rtlsdr (Redirecting link for your local area)

Video by cURLy bOi who wrote the wintelive software: https://youtu.be/OTKn1UwYMBI

The audio on this TETRA system is often not very good. I'm not sure of the exact reason for this but it sounds like they have the mic gain set to a fixed value rather than using AGC, so their voices are often way too loud or way too quiet. I don't know why they would do this. Maybe the radios they use aren't able to do AGC, in which case they must not be very good radios. I had to adjust the audio gain in this clip to reduce the volume of some radio users and increase the volume of others.

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Baofeng DM-5R Programming software download

I noticed that it was very difficult to find a working link to download this software since everybody else was linking to the file hosted on radioddity.com which they had removed. I found a working download link eventually but thought I would post a new link online so others can find it easily. If you want to provide a file for download, please host it yourself or put it on some file host instead of just linking to someone else's download!
Anyway here it is:
Download
The link contains the software for the Baofeng DM-5R DMR radio for Windows and Mac OS.

Baofeng DM-5R demystified

The first time ever the Baofeng DM-5R has been explained honestly and without BS. If you noticed the poll in the card, please do answer it. I'd like to know what you think of it.