Batboard

Hi all!

Recently I find out something very "good" - that US versions of some radios doesn't have DPL codes non-included in old EIA/TIA-603 standard (standard describes only 83 codes).

My US Waris have 87 DPL codes (83 standard + 4 "non-standard": 036, 122, 525, 645).

My MTS2000 has 84 codes (83 standard + 1 "non-standard": 645).

This is NOT FAIRLY, because for e.g. EMEA Waris radios have 103 codes (83 standard + 20 "non-standard": 36, 53, 122, 145, 212, 225, 246, 252, 255, 266, 274, 325, 332, 446, 452, 454, 455, 462, 523, 526). And also majority of advanced amateur transceivers have 104 codes.

Any way to get "non-standard" codes on US Waris and MTS2000?

May be firmware upgrade can help?

Or some RSS/CPS tricks exist?

Or other ways?

just curious to how you are shure that the radio is a us radio. i was under the impression that all of the us versions did dpl?

HLA wrote:just curious to how you are shure that the radio is a us radio. i was under the impression that all of the us versions did dpl?

I sure that I own US radios.

- CDM series is US by default.
- MTS2000 have signs on the original case (MADE IN USA BY MOTOROLA; For customer service call 1-800-523-4007. Radio products group, Ft. Lauderdale, FL. Covered by one or more US patents). Supports MDC1200.

Both radios can DPL.

But you radios cannot? That's quite doubtful!

I wish M would get with the program and include all 104 DPL codes like what other manufacturers have done. M radios only have the standard 83 codes plus a few non-standard codes. The exact number varies by model and series. It's not a country-specific thing.

When I use DPL, I stick to using codes that are part of the standard 83 codes. I avoid using a non-standard code to avoid problems with compatibility across different radio manufacturers.

Theoretically, there are 512 possible codes. However, only a subset of the total number of possible codes have been implemented. Some codes are duplicates of other codes when partially shifted into the decoder's shift register. Some codes produce a waveform that looks similar to a CTCSS/PL tone, causing PL decoders to false decode and DPL decoders to get falsed by PL tones. Other codes don't work reliably or simply don't work at all. All of these problem codes have been eliminated from the table. Although there probably are many more codes available which would probably work fine, they weren't implemented because the goal was to come up with a usable set of codes, enough to to provide a good alternative to the set of analog CTCSS/PL tones.

An old ham radio friend of mine once told me DPL also stands for "Definitely Prevents Losers". I'm having to use DPL full time now on GMRS to better ignore the unlicensed bubble pack riff-raff. My 2 GMRS repeaters only use DPL now.

My recommendation is to stick to using only DPL codes that are part of the original set of 83 standard codes. These codes are known to work well.

IN regards to this I have mtr2000 programmed w/a DPL of 525 and the P1225'2 MT2000 M1225'S WON'T Handle this DPL any ideas??

Stu

Hi,

The bit pattern for DPL 525 is 101010101 - which is why they DON'T use it - in anybody's system. I have no idea how you got it into an MTR, but I would suggest trying something more standard.

73 DE Hartley

Hartley wrote:Hi,

The bit pattern for DPL 525 is 101010101 - which is why they DON'T use it - in anybody's system. I have no idea how you got it into an MTR, but I would suggest trying something more standard.

73 DE Hartley

I also suggest using a standard code, part of the origninal 83 code set.

I know some Icom and Kenwood radios will allow you to program any DCS code from 000 through 777. Although you may be able to program non-standard codes, they are not guaranteed to work properly. I called it DCS because it technically can't be called DPL in a non-M radio!

The actual code for DPL525 is 4525. There is an octal "4" (100 binary) ahead of the 3 octal digits that you can program. There are also 11 error-correcting code bits ahead of the last 12 bits, the last 9 of which make up the 3 digits you can program. The "100" bit sequence is what the DPL decoder synchs up on to see if the next 9 bits match what the decoder is looking for. There are no "start" and "stop" bits in a DPL word. The only bit sequence the decoder knows to look for to start looking for the rest of the codeword is the fixed 100 pattern in the DPL word.

The actual full 23-bit DPL word for DPL525 is: xxxxxxxxxxx100101010101
Each "x" represents an error-correcting code bit (11 ECC bits total), generated by the Golay algorithm from the last 12 bits in the word, the last 9 of which make up the 3 octal digits you can program. It's a (23,12) cyclic Golay pattern. The math behind the Golay algorithm and the generation of the ECC bits is something else. It's purpose is to help the decoder recognize the desired bit pattern in the presense of noise.

Any DPL code you program really has 11 ECC bits plus an octal 4 (100 binary) ahead of the 3 octal digits (last 9 bits) that you can program.

If you program DPL525, I suspect it will make an obnoxious "buzzbuzzbuzzbuzzbuzz" sound on the air. It might cause some PL decoders to false decode on the waveform because it looks enough like a PL tone to some decoders.

I prefer to stick to using only DPL codes that are part of the original 83 standard code set. They are known to work well and virtually all radio manufacturers have implemented them, so they should work across different radio brands.

On GMRS and MURS, I'm having to use DPL full-time instead of PL because the DPL="Definitely Prevents Losers" factor.

Good luck.

EAN503 wrote:IN regards to this I have mtr2000 programmed w/a DPL of 525 and the P1225'2 MT2000 M1225'S WON'T Handle this DPL any ideas??

Stu

This code exist in US Waris (Professional Series) radios!

n1das wrote:I know some Icom and Kenwood radios will allow you to program any DCS code from 000 through 777.

Which Kenwood models? You can provide few examples??? Just I use many of Kenwoods and thinks that it is can make only custom QT/PL/CTCSS tones, but not DQT/DPL codes.

The Commercial Series radios from Motorola will allow you to enter any DPL code you wish...not that it matters though. As far as i can tell, any possible "non-standard" DPL is the same as one of the the "standard" DPLs. Here's a good reference for DPL info:

http://www.open.org/blenderm/dcs.html

Todd

wavetar wrote:The Commercial Series radios from Motorola will allow you to enter any DPL code you wish...not that it matters though. As far as i can tell, any possible "non-standard" DPL is the same as one of the the "standard" DPLs. Here's a good reference for DPL info:

http://www.open.org/blenderm/dcs.html

Todd

Not any. Try 024, 027, 028, 029, 030 & etc. But I guess that pattern of these examples will be similar to other codes Therefore it is doesn't have practical sense.

wireless.friendly wrote: Not any. Try 024, 027, 028, 029, 030 & etc. But I guess that pattern of these examples will be similar to other codes Therefore it is doesn't have practical sense.

Umm, yeah...I just tried every one of those DPL codes, and the Commercial Series lets me put in ALL of them. It doesn't care, just like I said.

Todd