Need Help with NXDN Digital Programming

[dapaq2]

I am looking for someone who is experienced with Kenwood NXDN that could help me program a couple of NX series radios for NXDN Digital 6.25. I have gone in and entered the frequencies, selected NXDN, and very narrow, and the audio sounds just absolutely horrible! It makes my voice sound like a robot talking into a tin can and has that 'tape drag' effect like the cassette tapes would do at times. The transfer rate is also delayed, it takes about 2 seconds for the receiving radio to start talking vs instantly in analog narrow band. I am fairly sure that I just dont have the radios programmed correctly and I really could use someones help who does this for a living that can point me in the right direction or provide me with some guidance.

Thanks much,

Doug

 

[Josh]

How much exaggerating are you doing here?

There is a digital delay between A/D to D/A conversion. The delay is about 1/4 second or so.

And yes, it will sound "robotic" as you say, since it's a digital mode using AMBE. It should sound a lot like the sound samples here at AMATEUR RADIO DIGITAL VOICE COMMUNICATIONS . Check a few out and see if your results are similar.

All you should have had to do is program the frequency set it for NXDN very narrow and be done for as basic operation as you could expect, that or your radios somehow got horribly out of tune, but if that were the case then digital operation would be hit or miss as the data stream wouldn't be modulated properly.

 

[dapaq2]

Well if I am "Exaggerating" then I am not doing it on purpose, I dont have them in front of me to retest again, Maybe I will check them out again today and count exactly how long the delay is.

If digital is suppose to sound robotic, I personally do not know how everyone can say that digital is so much better than analog. Maybe in the added features are but it sure isnt in the voice quality department thats for sure.

I did indeed program them as you mentioned, I thought for sure I had done something wrong but it sounds like I did it correctly and was just expecting it to sound better.

Any pointers on NXDN settings for Unit Id, Unit Id Name, Group Id, and ect. Also how about FleetSync, can you help there? I understand that FleetSync is a better system vs MDC1200?

Thanks much,

Doug

 

[baycomm]

There have been many improvements from Kenwood with regard to the quality of NXDN audio. It is very important to have the latest firmware revision (currently 2.52). This revision enables enhanced audio equalization settings that will remove the robotic sound and let you tailor the audio to your specific preferences. Also, the web site listed in the post by Josh does not contain any NXDN audio samples. While various brands of digital radios use the same AMBE +2 CODEC, they do not all employ the same signal processing and therefore may sound drastically different. Once you update your firmware send me the program file & I will optimize the audio with the settings that we have found to work best.

 

[dapaq2]

Thanks for the info Baycomm,

Firmware is up to date on all our radios to version 2.54. Feel free to send me a newly created .dat file with freqs for the following TX160.230 RX160.230. I will compare your data from your example file with my file.

Thanks much,

Doug

 

[dapaq2]

Baycomm, What areas in the software are you making the adjustments? Is it in Audio Equalizer tx and rx? Can you tell me where and what you adjust?

Doug

 

[baycomm]

Try the following under the NXDN tab:
Audio
Function Type: Enhanced
RX Audio Response: Check "Low"Cut", Gain control: Low, Equalizer: High Boost
TX Audio Response: Auto Gain Ctrl: ON, Audio Equalizer: Flat

 

[dapaq2]

Thank you Baycomm, I will use those settings for awhile and see how it works out.

Doug

 

[LTR]

Baycomm, have you done any audio testing with the new NX-320 radios? I just got a few of those and it seems like they might need a different setting for RX audio than the NX-300's.

 

[baycomm]

I haven't gotten any yet-still listed as on backorder.

 

[LTR]

I got in one of each, the display version and a non-display version about two weeks ago, they have the same enhanced audio settings as the NX-x00 radios, but they do not have the standard filter settings. The radios sound a little more "tinney" to me and seem to need the flat setting instead of high boost. Let me know what you think when you get some in.

 

[ck8308]

Which software need fo NX-320?

Baycomm, have you done any audio testing with the new NX-320 radios? I just got a few of those and it seems like they might need a different setting for RX audio than the NX-300's.

Hi, LTR, What programe you use fort NX-320 ? , i use kpg-141d , but it can't read and write program..


thanks for help

 

[LTR]

I use KPG-141DN version 1.21. When I first got these radios I had the same problem, then I found out that I was not pushing the two prong cable all the way into the radio. It is a tight fit, that needs snapped in.

 

[LTR]

I purchased mine through my local Kenwood dealer.

 

[ck8308]

I purchased mine through my local Kenwood dealer.

i got areadly the software, but just problem how to start programming, got any samle file for help, thanks so much....


that's 1st thime use nxdn digital system, no understand for starting..