SDRTrunk RTL-SDR skipping over P25 transmissions

[Dominic V]

Hello everyone, I was wondering if anybody would know why sometimes when I'm using my 2 RTL-SDRs to listen to a P25 system it will pick up all transmissions, but then randomly it will miss one. Does anyone know how to fix this? I am monitoring the Albany County P25 system in Albany, NY monitoring the Albany County Simulcast site. I have 2 RTL-SDRs so I have plenty enough bandwidth for 2.8mhz spacing.

Thanks,

Dom

[Spike's Custom Worx]

So I found something interesting, I did some testing with some ram combinations. 3 of the same machines, 1 with 2 4gig sticks and 2 with 1 4gig and 1 8gig fir a total of 12...on the 8gig machine sdrtrunk is using 1500 or so Mb of ram, on the 1 12gig machine sdrtrunk is using around 1400 mb and the other machine is only using 700 mb. The machine with only 8gigs seems to work the best. I'll have 2 8gig sticks in my possession to try Sunday 

[Dominic V]

I’m not sure if that was meant for this thread..

[Spike's Custom Worx]

It was, because I have the same skipping issues that I've been trying to correct for a long time and the best solution it looks like so far is adding more ram and forcing sdrtrunk to use it

[Dominic V.]

I have plenty of RAM, 32gb to be exact. My computer is brand new and has the best specs, no reason for it to be a performance issue.

[Brad Wicks (Ulti P. Uzzer)]

Your thinking that have 2 SDRs being enough may not necessarily be true. Your assumption would depend on how busy the sites are you listen to, you may need to add a 3rd SDR. I built a killer fan cooled 5 SDR array For SDRT.  You don't need that many, but may need a 3rd one.

[charley....@gmail.com]

Yep.  Sometimes the "free" SDR might be assigned to a voice channel that overlaps the spectrum coverage that you might assume would be covered by the SDR receiving the control channel.  There is a kludge out there that forces each SDR to cover specific chunks of spectrum but I don't know the technique - hopefully someone can chime in.  I avoid the issue by using Airspys with SDRT.

[Austin Hruskach]

In the SDRTrunk Directory, open the SDRTrunk App Log and look for the RAM usage in the brackets. This is the Java memory allocation. See if it gets close to the threshold. Regardless of the RAM in your system, edit the SDRTrunk.bat file and add Java parameters to allocate more RAM.

"-Xms4g" will allocate 4GB of RAM.