STM32-DVM-MTR2K v.2.0c

Help with other MMDVM Repeater Boards (with NO onboard RF)
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LA4AMA
Posts: 7
Joined: Fri Jun 05, 2020 1:00 pm

STM32-DVM-MTR2K v.2.0c

Post by LA4AMA »

Is there a original Linux MMDVM file to be downloaded and flashed to the micro SD-card on the MTR2K modem ?
The SD-card on my modem contains nothing.....

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I did also try another micro SC-card with Pi-Star Nano-Pi Air v. 4.1.4 on it, but the Network card does not seem to function.
My DHCP router shows no connection to the MTR2K card, there is no activity on the network LED on the MTR2K card either.

EDIT 15:03 local time:
And then I found out what was wrong. I had to use the Nano-Pi file, not the nano-Pi Air.
Then it works fine.


http://www.pistar.uk/beta/Pi-Star_NanoP ... b-2021.zip

Ouuchhh....

LA4AMA
Roar
Last edited by LA4AMA on Fri Apr 30, 2021 4:43 am, edited 1 time in total.
LA4AMA
Posts: 7
Joined: Fri Jun 05, 2020 1:00 pm

Re: STM32-DVM-MTR2K v.2.0c Repeater

Post by LA4AMA »

The modem from Cort Buffington works great. I believe the MTR2K modem from Repeater-Builder is nearly identical.
Cort's modem comes with his own software, which is Linux-based, but I installed Pi-Star on my setup because I am lousy at using Linux.
Info:
http://ks-dmr.net/stm32-dvm-mtr2k-information/

Repeater-Builder:
http://www.repeater-builder.com/product ... MTR2k.html


I got help from Cort on how to setup the Motorola MTR-2000 repeater without using the WL (Wireline) card that came with most of these repeaters.
The Wireline card was installed in the upper position inside the MTR-2000:
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I have written a complete setup of this installation in the attached PDF file:

https://www70.zippyshare.com/v/WPKCSlpX/file.html

The MTR-2000 from Motorola is a great repeater. I see quite a few of them on eBay etc.

I also installed a small 60x60mm fan behind the front panel that blows cool air directly onto the Nano-Pi:

Image

I used double sided adhesive tape (Stokvis SuperTape VST4050C) and some strong glue to hold it in place.

There is a setting in Pi-Star (under Configuration and then click on EXPERT and MMDVMHost and go down to Modem) for using COS as Lockout for MMDVM, it should be set to 1:

Image

The only issue I found was that the CW ID is not sendt with CTCSS on transmit, but that can be done if you are using an external FM repeater controller. I am looking into setting up a MTR-2000 with digital modem and external FM controller, the small and inexpensive ID-O-Matic IV. A great unit that I have been using a lot on Tait T-800 II and Tait TB-7100.
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