MMDVM Board - XD3804300

Help with other MMDVM Repeater Boards (with NO onboard RF)
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G0FHM
Posts: 17
Joined: Mon May 14, 2018 8:47 pm

MMDVM Board - XD3804300

Post by G0FHM » Mon Oct 28, 2019 10:41 am

Hi folks,

I'm getting all the kit together for building a DMR repeater.

I have the above mentioned board (see attached photo).

I have a Pi 3B+ running 4.1.0-RC6.

When I connect the board to the Pi, the LEDs' on the board cycle, the red PWR LED is on, and the green LED flashes. However, the Pi won't boot - There is just the solid re LED, and no green ACT LED.

Am I doing something wrong? Or have I got a duff board?

Thanks,

J

Oh and PS - Can somebody tell me what the IGN connector does? I want to think ignition.....
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SP2GCH
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Location: Poland
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Re: MMDVM Board - XD3804300

Post by SP2GCH » Mon Oct 28, 2019 11:49 am

Have you chosen the Pi-Star modem configuration?

G0FHM
Posts: 17
Joined: Mon May 14, 2018 8:47 pm

Re: MMDVM Board - XD3804300

Post by G0FHM » Mon Oct 28, 2019 11:52 am

I cannot get the pi to even boot with the board connected, so cannot even change it.

I will try to select it, then power down the pi, connect the board and attempt to power it up again!

SP2GCH
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Re: MMDVM Board - XD3804300

Post by SP2GCH » Mon Oct 28, 2019 12:00 pm

As you have the opportunity to connect the monitor to Raspberry to plug in and see if you can see anything. For me it is as if the card was damaged or a problem with the recorded image.

G0FHM
Posts: 17
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Re: MMDVM Board - XD3804300

Post by G0FHM » Mon Oct 28, 2019 12:08 pm

I will try and have a look.

I'm not sure it the pistar image, as I can use the same Pi with a Radioddity GD77 as a hotspot and I have tried a STM based hat on the GPIO pins, and that works fine also. It's either a configuration setting I am missing, or a defective modem board.....

G0FHM
Posts: 17
Joined: Mon May 14, 2018 8:47 pm

Re: MMDVM Board - XD3804300

Post by G0FHM » Mon Oct 28, 2019 12:53 pm

Problem solved!

It would appear to be a power supply issue. If I remove the hat, power up the pi, and immediately put the hat on, everything powers up and runs as it should.

I currently have a 2A PSU which seems to work for the STM hats, but obviously the initial current pull on startup is too much for the PSU. Best I invest in one that has a bit more beef!

Thanks for pointing me in the right direction regarding plugging the pi into a monitor!

J

SP2GCH
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Re: MMDVM Board - XD3804300

Post by SP2GCH » Mon Oct 28, 2019 1:20 pm

It is good that the problem has been solved :) I use a 2.5 Amper adapter

g7kbr
Posts: 32
Joined: Thu Nov 01, 2018 1:03 pm

Re: MMDVM Board - XD3804300

Post by g7kbr » Wed Oct 30, 2019 9:56 pm

Just saw you have one of the MMDVM pog STM32 boards. Do you know how to program these with the latest MMDVM code? I see these boards are from eBay and only cost £20.


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