I am not sure if I set something wrong or this is a limit of the device. I built a new linux box and installed op25 as suggested on the page of http://op25.osmocom.org/trac/prefs/wiki/InstallInstructionsPage http://op25.osmocom.org/trac/prefs/wiki/InstallInstructionsPage I blacklisted the dvb_usb_rtl28xxu kernel module as it was interfering when I tried to run the scope. When I run the RTL scope command from http://op25.osmocom.org/trac/login/wiki/SignalScopePage http://op25.osmocom.org/trac/login/wiki/SignalScopePage, ./scope.py --args 'rtl' -g 65 -f 123.45e6 -N 'LNA:49' -V -v 0 -S 1000000 -q 39 -T trunk.tsv I change the -f freq to my freq of interest and the scope runs but it appears to be in a locked read only type state. I can view the spectrum analyzer but I can change nothing in that panel. Everything is sort of greyed out. I tried not loading the -T trunked part of the command as I am looking at a conventional channel right now. I tried to see if I could find anything in the internet on this as well as here but not finding anything. If I run the command as a discriminator scanner installation, the scope module is not locked and I can connect other screens like c4fm, constellation etc... Is this a limit of the RTL device or did I overlook something?? I have been trying on and off over last couple years to get OP25 working and my Linux skills have been improving in that time but not sure what this is caused by .. Doug
the most common cause of this condition is insufficient CPU. It may improve (or may not) improve with a lower sampling rate (-S)
Max
Max;
Thanks! I can try sampling rate tests, but horsepower sounds like the issue.
Sorry for the newbie question as I have struggled and given up several times over the last couple years on getting this going. The new installation procedures are much clearer to me and a lot easier to replicate. During the compile, I did see more than a few deprecation type warnings so not too sure how long those instructions will stay valid.
I am using an Atom mother board. CPU horsepower could be an issue! I was not sure how much juice the DSP processing required. I can build a more powerful machine as I have other parts I can build up.
Just to clarify, assuming I can get a more powerful host, the RTL will allow for constellation views etc??? just checking in case I need a more robust RX platform as well. I am hoping we can use this OP25 RTL platform to do P25 TX alignment on MMDVM P25 systems in absence of a real P25 Test Set. I do have access to Anritsu P25 gear at work, but looking for a field solution for those who do not.
I am looking to work with Phase II also as I have a Phase II system I maintain.
Doug
From: op25-dev@yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Tuesday, April 11, 2017 09:42 AM To: op25-dev@yahoogroups.com Subject: [op25-dev] Re: New Install, RTL Dongle only allows spectrum analyzer view
the most common cause of this condition is insufficient CPU. It may improve (or may not) improve with a lower sampling rate (-S)
Max
yep, the RTL is good for approx. 2.4 MHz width of spectrum, and the Atom seems to be at the margin of what works. When properly set up OP25 will work with the RTL for full capability (constellation, spectrum, datascope) etc.
Max;
Excellent! I appreciate the effort to make it all a little easier to get going. I will re-task a more powerful PC tonight... Thanks for your time!
Doug
From: op25-dev@yahoogroups.com [mailto:op25-dev@yahoogroups.com] Sent: Tuesday, April 11, 2017 01:34 PM To: op25-dev@yahoogroups.com Subject: RE: [op25-dev] Re: New Install, RTL Dongle only allows spectrum analyzer view
yep, the RTL is good for approx. 2.4 MHz width of spectrum, and the Atom seems to be at the margin of what works. When properly set up OP25 will work with the RTL for full capability (constellation, spectrum, datascope) etc.
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'Doug Bade' kd8b＠thebades.net [op25-dev] -
ikj1234i＠yahoo.com [op25-dev]
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kd8b＠thebades.net [op25-dev]