Re: OK I seem to be homing in on the problem
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I. have posted some examples of the sounds in a second post.
I understand that PBEACON?is not controlled by GPSD support but PBEACON and more importantly for my testing digipeating are functional if GPSD is enabled.
The behavior is as follows:
- GPSD disable: ?Direwolf functions normally and packets are decoded by nearly all stations which receive the packets
- I enable GPSD and nothing else?and the PBEACON?packets and digipeated packets sound "rough" and the packet ?are not decoded
- I enable GPSD and enable TBEACON and digipeating and the packets sound rough?and are not decoded
When GPSD is enabled it measurably degrades?the sound when listened to and the packets can not be decoded.
It is not a function?of sound level: ?adjusting levels changes volume but not behavior.
It is not a function of the sound card: ?this problem is evidenced with a DINAH usb sound?card and a Signalink usb sound card.
At this point it would?appear that there is a problem with the GPSD capabilities in Direwolf.
Direwolf works fine for a static digipeater but is not working as a tracker with location provided by gpsd daemon.
Hello Don,
My direwolf system performs perfectly with GPSD
disabled in the direwolf.conf.
I have PBEACON?on and have set up a system to listen to the
sound.
The PBEACON function is for static locations only and doesn't have
any interaction with GPSD.? It's on the TBEACON (Tracker BEACON)
that uses your GPS.
I hear the usual rough but steady sound.
I don't know quite what you mean by "rough" but your 1200bps AFSK
packet sounds should sound similar to these examples with a clear,
not distorted sound:
??
I now enable the GPSD option.
PBEACON?is still on.
Again, these should be 100% unrelated.
I listen to the sound, it is extremely rough and erratic
and my systems are unable to decode the packet.
You're listening to what you're system is transmitting or what it's
receiving?? Can you provide a mp3/wav file example of this?
It appears that enabling GPSD seriously?degrades the
quality?of the modulating sound produced?by direwolf making
the sound unreadable most of the time.
I have increased and decreased the volume of the sound and
it has no impact, so. it appears to be an issue in the
generation of the tones themselves not in the levels.
If I was to guess, once you enable gpsd and it powers up the GPS and
then your radio starts transmitting, you're getting RFI coming back
into the system that's impacting your sound card's output.? This
isn't an uncommon issue.? How close are all the wires and cables to
the transmitting antenna?? Can you move the transmitting antenna and
ideally transmitting radio as FAR AWAY from the rest of the
Raspberry Pi, GPS, and all cabling as possible?? Can you add
ferrites to both sides of all your power, audio, etc cables?
--David
KI6ZHD
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