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Re: Update 21st Feb
Posted: Tue Feb 25, 2020 2:08 am
by kd2lh
So far, it's been running about 5 hours with plenty of usage and no problems.
I'll test for the next few days, and if we can confirm this solved the issue, I suggest we make recommendations in documentation and manuals for adding a ferrite to prevent RFI and use of a metal enclosure for the computer.
This was failing on my RPI 4b which effectively had a metal enclosure thanks to a thick metal heat dissipation case, so the Ferrite filter might be needed in any case.
Note that I've been running the hotspot at 1 watt.
Re: Update 21st Feb
Posted: Tue Feb 25, 2020 4:56 am
by VK3KYY
kd2lh wrote: ↑Tue Feb 25, 2020 2:08 am
So far, it's been running about 5 hours with plenty of usage and no problems.
I'll test for the next few days, and if we can confirm this solved the issue, I suggest we make recommendations in documentation and manuals for adding a ferrite to prevent RFI and use of a metal enclosure for the computer.
This was failing on my RPI 4b which effectively had a metal enclosure thanks to a thick metal heat dissipation case, so the Ferrite filter might be needed in any case.
Note that I've been running the hotspot at 1 watt.
You may have already answered this question, but ..
Are you using the antenna on the top of the radio or connecting to an external antenna?
Re: Update 21st Feb
Posted: Tue Feb 25, 2020 9:06 am
by EB3AM
I noticed this problem when I had the original antenna connected to the walkie directly. It has never happened to me with an outdoor antenna. And I also noticed that it is more unstable in UHF than in VHF.
It is definitely an RF issue. The programming cables are not shielded. One would have to make a good one. The Raspberry should be in a metal case. and the radio should also be shielded. And done, remove the battery and charger and put in a power supply.
Re: Update 21st Feb
Posted: Wed Feb 26, 2020 3:57 am
by kd2lh
I am using the radio with the antenna that ships with it mounted on the radio, not a remote antenna.
Marc
Re: Update 21st Feb
Posted: Wed Feb 26, 2020 4:30 am
by VK3KYY
kd2lh wrote: ↑Wed Feb 26, 2020 3:57 am
I am using the radio with the antenna that ships with it mounted on the radio, not a remote antenna.
Marc
OK.
That explains why you have so much RF around the radio to cause problems.