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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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
KE7FNS
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by KE7FNS »

IW8FAY wrote: Thu Jun 17, 2021 6:31 pm can you give me a hand?
Need more info, please answer all of the follow questions with as much detail as possible.

Which MMDVM_HS hat? (look on the PCB for silkscreened text)

Which modem selection do you have selected in the dashboard?

How do you have it connected to the RPi? GPIO or USB

When you power on the RPi, do the LED's on the MMDVM_HS hat flash 3 times? YES/NO

Does the PWR LED on the MMDVM_HS hat light up and stay solid? YES/NO

Does the SRV LED on the MMDVM_HS hat blink? YES/NO
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
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 ???



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KE7FNS
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by KE7FNS »

IW8FAY wrote: Fri Jun 18, 2021 5:41 am Dual GPIO modem
I am not familiar with a modem that says "Dual GPIO modem", can you take a photo of it and post it so I can see what design it was based on? Where did you buy it from? Did the page you bought it from have any instructions listed on it? Did it come with any documentation? Did the page/documentation say it was compatible with RPi 4's?

IW8FAY wrote: Fri Jun 18, 2021 5:41 am A friend of mine told me that maybe there is incompatibility ???
My initial guess is it is because you are using an RPi 4, I have seen some instructions for some MMDVM_HS boards that require removal of a resistor to work with a RPi 4. The problem is at this second I don't know if you have one of these boards or not yet, but I suspect you do and you overlooked the warning on the sellers site.
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
IW8FAY
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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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KE7FNS
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by KE7FNS »

IW8FAY wrote: Fri Jun 18, 2021 10:32 pm what resistance must be removed? I try to do it.
the model is 8GB P4, thanks.
I told you I cannot find a MMDVM_HS board when I search for "Dual GPIO modem". Please post a photo of the MMDVM_HS hat, not what you selected in the dashboard. (although I am very surprised that setting doesn't work for you)

I can't tell you if you need to remove a resistor without identifying the exact board you have and then finding the instructions for your specific board first. Every board design is different.

Do you have the ability to try the modem with another RPi that is not a RPi 4? RPi Zero, RPi 2, or 3?
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
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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KE7FNS
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Re: RP P4 8GB, DOES NOT WORK WITH DUPLEX MMDVM

Post by KE7FNS »

IW8FAY wrote: Sat Jun 19, 2021 7:26 am here's what you asked, I also have another Mmdvm and the same with the PI 4B does not work!
Can you post a photo of the other MMDVM hat also?

The information I need to properly identify the board and revision it is under the OLED. So either remove the OLED, or get very creative with angles and see if you can get the information on the PCB.

From a cursory glance it is a clone of D2FET's board, I'm not sure if things were updated/modified on your specific board.
https://github.com/phl0/MMDVM_HS_Dual_Hat

I'm pretty sure I've tested two of those boards on a RPi 4, but they are 1.3 revisions from 2018. I will test them again later when I have some free time.

Your modem selection you posted in the dashboard is correct for that board.
If someones previous actions are any indication of their future actions, then I predict the deletion and removal of access will happen at any moment. 7-11-2020.

"07/13/20 This Website Has Been Taken Down" ... again :lol:
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