11 Apr
2017
11 Apr
'17
2:26 p.m.
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
11 Apr
11 Apr
3:42 p.m.
the most common cause of this condition is insufficient CPU. It may improve (or may not)
improve with a lower sampling rate (-S)
Max
4:13 p.m.
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(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com]
Sent: Tuesday, April 11, 2017 09:42 AM
To: op25-dev(a)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
7:34 p.m.
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.
8:14 p.m.
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(a)yahoogroups.com [mailto:op25-dev@yahoogroups.com]
Sent: Tuesday, April 11, 2017 01:34 PM
To: op25-dev(a)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.
2583
days inactive
2583
days old
4 comments
3 participants
participants (3)
-
'Doug Bade' kd8b＠thebades.net [op25-dev] -
ikj1234i＠yahoo.com [op25-dev]
-
kd8b＠thebades.net [op25-dev]