RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Help with Raspberry Pi Foundation Boards (Raspberry Pi, Pi Zero, Pi Zero W, Pi A, Pi B, Pi B+, Pi2 B, Pi3 B, Pi 3 B+)
IW8FAY
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Joined: Mon Sep 14, 2020 11:17 am

RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by IW8FAY »

hi ,, I have a problem with a DUPLEX mmdvm, I practically can't connect to my P4 8 GB. I TRIED 2 UPDATED DUPLEX fw, MODEM and other tests but I can't connect .... there will be some incompatibility problem, can you give me a hand? Thank you

P4 8GB
MMMDVM DUPLEX
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MW0MWZ
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by MW0MWZ »

"does not work" is pretty vague - any clues to go on, any logs etc?
Andy

73 de MW0MWZ
http://pistar.uk
IW8FAY
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by IW8FAY »

Hi and thank you.

Dual GPIO modem
- The red LED flashes and the green is fixed
- I connected the MMDVM with - - -
- Home connection in wi fi
I tried all kinds of modems but it doesn't go with anyone, I also tried with the command
"Sudo Pistar-Findmodem" but find no modem! It's amazed because he does it with 2 mmdvm duplex! I also set the simplex mode that duplex .... nothing
A friend of mine told me that maybe there is incompatibility ???



Help
IW8FAY
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Joined: Mon Sep 14, 2020 11:17 am

Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by IW8FAY »

what resistance must be removed? I try to do it.
the model is 8GB P4, thanks.
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IW8FAY
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by IW8FAY »

here's what you asked, I also have another Mmdvm and the same with the PI 4B does not work!
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G6WOV
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by G6WOV »

I have also bought a Dual Hat and a Pi 4 4GB, that looks identical. My Hotspot was bought from Amazon

https://www.amazon.co.uk/Hotspot-Module ... B08DY96HHH

But I (still) haven't chosen a Radio to buy to use with it, and so assumed the blank OLED Screen was because there was no Radio attached. Mostly the Screen is blank, the green Power LED is on, and a red LED flashes. But it does show "Closed" when Powered down from the Dashboard, it also says "Starting" for a few seconds, at about 30 seconds after powered up. 

I can try it with a Pi 3 at some time soon and let you know if it performs any differently. But without a Radio attached probably it will appear the same as the Pi 4. But if I can try anything else with it, please let me know. But if it does not work with a Pi 4 then my son might get to swap his Pi 3 for a Pi 4 yet! 🙂
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G6WOV
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by G6WOV »

Unfortunately I can't see the Model Number without desoldering the OLED. But the Dashnoard shows it as
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The details on Amazon are;
Product details
Date First Available ‏ : ‎ 30 July 2020
Manufacturer ‏ : ‎ Hopcd
ASIN ‏ : ‎ B08DY96HHH
Manufacturer reference ‏ : ‎ Hopcdwru7hoc8ne
G6WOV
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by G6WOV »

The LEDs flash as you describe.
Is this the section of the Log File that you required?
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I think mine should work when I get a Radio connected to it.
Retirement is just weeks away 🙂
G6WOV
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by G6WOV »

I was intrigued by the original post by IW8FAY as I have made the same choice of Hat and RPi4 combination. I'll keep an eye out on any progress with this post, for when I get "on the air" for real. Also as soon as I get an oppertunity to test my Hat with the Pi3 I'll let you know the results. I wonder if it will work on this original Pi ? This was one of the first units produced and belongs to my eldest son, who got up extremely early to buy it on the first release day.
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G6WOV
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by G6WOV »

Except just noticed this only has 26 GPIO Pins😂
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