Page 5 of 7
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 7:25 am
by F1RMB
Hi Alfred,
Looking at the dmesg output, it's riddled of:
Code: Select all
[ 211.777881] WARN::dwc_otg_hcd_urb_dequeue:639: Timed out waiting for FSM NP transfer to complete on 1
[ 211.778282] WARN::dwc_otg_hcd_urb_dequeue:639: Timed out waiting for FSM NP transfer to complete on 0
[ 211.812878] WARN::dwc_otg_hcd_urb_dequeue:639: Timed out waiting for FSM NP transfer to complete on 6
Maybe you can try to plug the programming cable to other SUB ports on your Pi3 B+ (maybe it's related to
https://github.com/raspberrypi/linux/issues/3401)
Cheers.
---
Daniel
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 9:26 am
by oe7abh
Hi Daniel,
The upper USB ports "raspberry (2017) pi 3 model B +" are marginally better, but not satisfactory. I also tested a "raspberry (2014) pi model B + V1.2" the same result.
Summary: GD77 hotspot
with raspberry (2017) pi 3 model B + and raspberry (2014) pi model B + V1.2 as GD77 hotspot with original SMA antenna does not work well.
I have not tested a raspberry zero-w and raspberry 4.
The GD77 hotspot works very well with an external antenna (outside antenna).
73 Alfred OE7ABH
http://tyrofly.at/
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 1:22 pm
by N1KY
For testing can you try a UHF frequency?
My setup is very different from yours but I had issues with my GD77 hotspot while using VHF. MMDVMHOST would routinely lock up while the GD77 was transmitting, even on the lowest power setting. I didn't have the option to use an outside antenna.
I switched the GD77's hotspot frequency from 2M to 70CM and have not had any issues since.
It might be worth trying.
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 4:49 pm
by oe7abh
Hi Craig !
I tested UHF with raspberry (2017) pi 3 model B + ....... same problem......
The RF injection blocked in the GD77 or Raspi at the right place ...
Maybe a technician can do that ?
Maybe a Raspberry zero-w is better against HF radiation ?
73 Alfred, OE7ABH
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 6:26 pm
by F1RMB
Hi Alfred,
What is the value of RFLevel in your MMDVMHost config file ([Modem] section).
Cheers.
---
Daniel
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 7:40 pm
by oe7abh
Hi Daniel, hi Roger !
The HF-problem is solved !!
Servo cable
3-pole twisted and
two turns on 2x ferrite ....
SERVOKABEL verdrillt Ferrit
My ferrite dimensions: outside diameter 10mm and inside diameter 5mm
The HF-power from 50mW to 5watt now work correctly on the GD77 hotspot - no TX-interruption !!
73 Alfred OE7ABH
http://tyrofly.at
Re: Stop transmitting occasionally...
Posted: Tue Aug 25, 2020 8:59 pm
by F1RMB
Hi Alfred,
So you have the worst GD-77 programming cable
Glad you find the solution.
Cheers.
---
Daniel
Re: Stop transmitting occasionally...
Posted: Wed Aug 26, 2020 6:04 am
by oe7abh
Hi Daniel,
I cannot say why there is no problem with many other devices. There are many different hardware setups.
I also can't say whether there are different components on the GD77 board.
The fact is that my cable has to be very radiation-resistant and it works perfectly.
I thank you for your help !
73 from Tyrol!
Alfred OE7ABH
Re: Stop transmitting occasionally...
Posted: Wed Aug 26, 2020 10:57 am
by F1RMB
Hi Alfred,
oe7abh wrote: ↑Wed Aug 26, 2020 6:04 am
Hi Daniel,
I cannot say why there is no problem with many other devices. There are many different hardware setups.
I also can't say whether there are different components on the GD77 board.
The fact is that my cable has to be very radiation-resistant and it works perfectly.
I thank you for your help !
73 from Tyrol!
Alfred OE7ABH
Yeah, but at 50mW, no one as experienced such problem. Maybe the USB plug or the cable itself has a problem.
Anyway, the one you built works
Cheers.
---
Daniel
Re: Stop transmitting occasionally...
Posted: Wed Aug 26, 2020 1:44 pm
by oe7abh
Hi Daniel,
The changes with the new cable are enormous:
The HF-power from 50mW to 5watt now work correctly on the GD77 hotspot - no TX-interruption !!
I can only recommend every GD77-hotspot operator to make such a cable.
HF in the device brings indefinable states .........
I wrote that I had tried several original programming cables and several GD77 radios - it was already a problem with 50mw HF-power.
I think here is the same problem!
viewtopic.php?f=9&t=1177
73 Alfred OE7ABH