Help with DSDPlus Fastlane and NXDN 4800

[GTR8000]

Nice! On the bright side, you cleaned up a lot of junk in your batch file, so there's that lol

 

[mtindor]

@slicerwizard you are suggesting switch it to 12.5, thanks I'll try that.

I don't think that is what he is suggesting.

NXDN48: 4.0 BW
NXDN96 / DMR: 7.6 BW
P25 standalone site / Phase I : 9.5 BW
P25 Simulcast / P25 Phase II: 12.5 BW

So you should consider the narrowest bandwidth that works for NXDN96 -- 7.6 in this case.

Mike

@mtindor yes distance is my friend (or enemy in this case). Moving closer to the source made a huge difference and removed the multiple errors I see from home. Unfortunately this system is seldom used and in the 30 minutes I was there got no hits on it.

View attachment 86112

LOL. At least you are able to see how much better it would perform with a stronger signal.

mike

 

[RaleighGuy]

Question deleted, I figured it out

 

[mtindor]

Excuse the stupid question, but how do I change the band width?

In the FMP* waterfall window -- if you are mouse-focused on that window, you can just type 'b' to toggle between the bandwidths, which show at the top border of that screen. You can press ? when focused on that screen to see all of the commands (many of which you should not even mess with). But "b" will switch between 4.0, 7.6, 9.5, 12.5, 25.0

Mike

 

[RaleighGuy]

I'm sorry for all the newbie questions, but I'm learning quick honest

 

[mtindor]

I'm sorry for all the newbie questions, but I'm learning quick honest

No problem. You seem to be. If you weren't, I probably wouldn't be answering lol.

Mike

 

[GTR8000]

NEXEDGE 9600 is 9.5 kHz

 

[mtindor]

NEXEDGE 9600 is 9.5 kHz

Ok. you run it at 9.5. I get great results at 7.6. I knew somebody would correct me. Coulda been worse -- Slicer coulda done it lol.

 

[GTR8000]

I can run it at 7.6 or 12.5 and get great results as well, but the correct bandwidth is 9.5. The emissions are actually just a bit wider than P25 FDMA (8K30 vs 8K10), but hey whatever floats your boat lol

 

[RaleighGuy]

Now I'm really confused since this website says 12.5

Next Generation Digital Narrowband (NXDN) - Signal Identification Wiki

NXDN is a digital narrowband trunked radio protocol used in commercial, business & industry, transport and Public Safety professional radio systems.

www.sigidwiki.com

 

[GTR8000]

Now I'm really confused since this website says 12.5

The signal fits within a 12.5 kHz channel, but the actual emission is a bit narrower, and does not take up the full width of the channel. Same with 4800 or IDAS, which fits within a 6.25 kHz channel, but is a bit narrower. Also known as the "occupied bandwidth".

The thing to pay attention to is the emission designator: NXDN48 is 4K00 (4 kHz) while NXDN96 is 8K30 (8.3 kHz)

 

[RaleighGuy]

Now I understand, thanks for the english version

 

[mtindor]

Ok. you run it at 9.5. I get great results at 7.6. I knew somebody would correct me. Coulda been worse -- Slicer coulda done it lol.

On second though, I probably do use 9.x. It's been a long time since I was trying to monitor NXDN96 sites. I still do try to narrow stuff up as much as I can, but if I was using 7.6 I was probably shooting myself in the foot.

m

 

[GTR8000]

All good...DSD+ is pretty forgiving unless you really set a whacky bandwidth filter, then you can get into some trouble. Also pretty good at determining the bandwidth it needs on its own, so while it's normally okay to set an initial bandwidth filter, you're better off not forcing it and letting the software auto-adjust as it tunes to voice channels.

 

[slicerwizard]

@slicerwizard you are suggesting switch it to 12.5, thanks I'll try that.

Sorry, I didn't notice that it's an NXDN96 system, so 9.5 kHz is ok, but try 7.6 kHz as well - it can reduce the amount of noise that DSD+ has to deal with. You need to watch the error rate in the DSD+ console window while parked on the NEXEDGE96 control channel.

But "b" will switch between 4.0, 7.6, 9.5, 12.5, 25.0

22, not 25.