I still need to do some fine tuning, but it does work. MMDVM Repeater Test of C4FM - DMR - Analog FM

When I use dmr or c4fm, I hear the digital noise also coming out to my Frequency on FM that has ctcss programmed in mmdvm and my radio. How do I stop that from happening. It appears the digital

Hi Geoffrey, To avoid hearing the DMR modulation on an analog channel of the repeater, I put a CTCSS on transmission. In this way, the terminal only opens when the repeater is in FM mode. When the

Hi Jeff, Not sure I understand your issue. What kind of noise do you have ? "Currently it works with CTCSS + COS" => You have CTCSS and COS activated ? 73 Geoffrey F4FXL - KC3FRA

Hi all, I noticed a squelch tail phenomenon which produces an unpleasant noise when the repeater no longer receives a carrier. Currently it works with CTCSS + COS I do not know what parameter can act

Hi Folks I see a lot of comments about the MMDVM not supporting various hardware with the new FM work. I think I need to point some things out: 1. The developers don't have access to all of the

Hi Geoffrey, RaspberryPi 3B / Stretch / Raspbian GNU/Linux 9 / Kernel 4.19.66-v7+ I don't think it's a platform problem since I have the same hardware/software combo since last year and I've tested a

Hi, What platform did you compile on ? I needed to compile under Debian 9. Compiling under debian 10 resulted in w non working Firmware. 73 Geoffrey F4FXL - KC3FRA

Yes of course - I see that now. Have to consider that when conversion time comes.

It is beneficial when using the new FM Analogue mode on the MMDVM. Not needed for digital modes. Dom G7NPW

Hi Scott and all, I did program the firmware, before I noticed the message about 'not load the firmware' version. So far no real issues observed with the 'older' modes, except for the fact that

Running 3 DMR repeaters I have not used COS in any of them, and they all use different modem cards Zum-USB, Zum-Radio Pi-Hat & RepeaterBuilders Hat, I presume this is for other modes? Regards Chris

Hi Matthew, This is what I did on mine and it works 100% Repeater pinout might be different to yours Dom G7NPW

The 2N7000 is an n-channel device, so you are using it as a source follower with a fairly high output impedance (that 47K). Note that the device itself has a minimum on-resistance of about 5 ohms. A

Thanks for the responses. Brian - The power comes from a Raspberry Pi over USB to a Nucleo Board where I guess it's dropped down to 3.3v. All grounds are commoned. I've confirmed there's 3.3V at the

I pulled mine up high with a 10k pull up resistor on my F0DEI board then set the Tait to be active high when busy. And applied this signal between the resistor and the board input. You have the

What is the input circuit to the STM32F446? What supply does that chip run from? -- Brian G8SEZ

Hi All, I am experiencing some issues with COS which I believe are being caused by a low voltage from the MOSFET (~1.6V) not being high enough to register as "high" on the STM32F446RE. I am using a

I compiled and uploaded the latest version on a STM32F104 board and noticed it won't start (no led sequence, only two lit when powered on). The version (prior to FM) that's working is

Hi Folks I've been spending quite a bit of time investigating the Kenwood repeater protocol. Internally the MMDVM when using NXDN uses the Icom repeater protocol to communicate between the modem and