9 May 2019

Metal case for duplex hotspot

by | posted in: DMR, Ham radio | 2

Unlike the “Jumbospot” most duplex MMDVM hotspots are not sold in a case.  You simply get the “modem” board and normally need to buy a Raspberry Pi and case separately.   I’ve tried making my own case from laser cut perspex, but it ended up being quite bulky, and I prefer to put RF devices into metal boxes, so I started to look for a suitable case which could be modified and eventually found … Read More
7 May 2019

Non-invasive GD-77 debugger connections

by | posted in: DMR, Ham radio | 3

I wanted to connect a hardware debugger into another of my Radioddity GD-77s, but didn’t want to drill a hole in the side like I did on one of the radios…   But I then realised that the rubber protector that goes over the 2 jack sockets in the side of the radio, can be removed, and this gives a handy hole, through which I can feed the Serial Wire Debug wires.   Inside … Read More
1 Nov 2018

MMDVM hotspot – hardware network switch

by | posted in: DMR, Ham radio | 30

Several months ago, John VK4JWT asked me if I knew of a way to switch his JumbSpot between Brandmeister and DMR Marc using some sort of physical switch. John was interested in this feature, because he does a lot of mobile operation and it would be much easier to be able to flick a switch on the hotspot, when driving along in he car, than it would be to mess around with different channels … Read More