SDRTrunk Missing calls - Site Review

[PtBreak]

I've searched on the forums to find a solution to two issues I've been having with a site I added.

First issue was missing calls when they key up back to back so I added an additional dongle to hopefully fix that issue.

The second issue was the calls would sometimes sound garbled and like it was a robot that was corrupted.

I manually adjusted the gain and the PPM which I read could of been an issue and since then they have been cleaner and sounded better.

However I'm still missing calls with 3 RTL-SDR4 dongles running on a Pi4B with the RR Pi Image and SDRTruck.

Can someone take a look at my set up to see if I'm missing something?

I have all other channels I don't want to hear muted and off.

I've attached a couple screenshots.

Thanks

Site Background:
3 RTL-SDRV4 Dongles
Ras Pi4B
Ocean City, MD P25 System on the Ocean City Simulcast Site Ocean City Site: Simulcast

769.26875c

770.05625c

770.85625c

772.10625c

772.43125c

772.70625c

 

[dave3825]

Post a link to the site, and system programming.

 

[mtindor]

First off, running the waterfall for any length of time on a PI is a nono. It's eats up CPU like no other, and the PI has nothing to spare.

Secondly, maybe the PI + SDRTrunk and 3 RTLs is just too much for the PI.

I understand wanting ot see the waterfall, but don't evaluate any sort of performance (clear / garbled audio, etc) with the waterfall on. Turn it off before doing that. I don't care what anyone says -- a PI running SDRTRunk with the waterfall on is a CPU killer.

 

[Whiskey3JMC]

Post a link to the site, and system programming.

OP did at the bottom of the first post...

Ocean City, MD P25 System on the Ocean City Simulcast Site Ocean City Site: Simulcast

Pretty sure only two RTL dongles would be needed to cover the system

 

[PtBreak]

First off, running the waterfall for any length of time on a PI is a nono. It's eats up CPU like no other, and the PI has nothing to spare.

Secondly, maybe the PI + SDRTrunk and 3 RTLs is just too much for the PI.

I understand wanting ot see the waterfall, but don't evaluate any sort of performance (clear / garbled audio, etc) with the waterfall on. Turn it off before doing that. I don't care what anyone says -- a PI running SDRTRunk with the waterfall on is a CPU killer.

I keep it off, I only turned it on for a screenshot and when I was adjusting the gains.

It def slows everything down so I never have it on unless I’m messing with a setting then it’s off and I also reboot the pi just to make sure every thing is fresh.

 

[mtindor]

If that is the only system you are going to monitor, you should just need/use two dongles. If you are running the latest 0.6.1 Final version, under each tuner you can set a minimum and maximum freq.

I would set something like:

dongle 1
min: 769.25625
vfo center: 770.0625
max: 770.86875

dongle 2
min: 772.09375
vfo center: 772.40625
max: 772.71875

That way each dongle is only responsible for a certain block of frequencies, and the dongle won't have to retune to keep a hold of the control channel.

Might be overkill, but that is what I would do.. I see absolutely no reason for three dongles.

MIke

 

[PtBreak]

If that is the only system you are going to monitor, you should just need/use two dongles. If you are running the latest 0.6.1 Final version, under each tuner you can set a minimum and maximum freq.

I would set something like:

dongle 1
min: 769.25625
vfo center: 770.0625
max: 770.86875

dongle 2
min: 772.09375
vfo center: 772.40625
max: 772.71875

That way each dongle is only responsible for a certain block of frequencies, and the dongle won't have to retune to keep a hold of the control channel.

Might be overkill, but that is what I would do.. I see absolutely no reason for three dongles.

MIke

I figured 3 might be overkill however I couldn't figure out why I still wasn't working.

Where do I find the setting for this? Thanks!

Edit: Think I found it I've attached screens for confirmation.

Thanks

 

[PtBreak]

If that is the only system you are going to monitor, you should just need/use two dongles. If you are running the latest 0.6.1 Final version, under each tuner you can set a minimum and maximum freq.

I would set something like:

dongle 1
min: 769.25625
vfo center: 770.0625
max: 770.86875

dongle 2
min: 772.09375
vfo center: 772.40625
max: 772.71875

That way each dongle is only responsible for a certain block of frequencies, and the dongle won't have to retune to keep a hold of the control channel.

Might be overkill, but that is what I would do.. I see absolutely no reason for three dongles.

MIke

It keeps changing the freq's you recommended I put in for each dongle, not sure if I'm missing or doing something wrong. It also sounds like I'm missing calls as well, any help is appreciated thanks!