Digital Mobile Radio (DMR) Part # 2

Home Brew - Kansas City Style!

Part #2

DMR is an another digital mode for hams. DMR is based on the international commercial radio standard. I could try and explain it, but the easiest way is to just have you look at: 

"The Amateur's Guide to DMR" by W2XAB

We here at BYRG World Headquarters have been experimenting in taking some of our older analog-only radios and using some behind the scenes "Sm0ke and Mirrors" secret sauce to make a very versatile DMR compatible digital radio repeaters.

The "RLP Special" chassis with a 

MCS2000 VRM-650 UHF Transmitter & Receiver decks. 

The heart of the repeater is the MMDVM Modem/Arduino DUE and the Raspberry Pi
Controller with the DMR-UTAH Pi image for software. 

We feel that this is a better way to go than the standard MMDVM Ubuntu Mate software load. 
The neat thing about this is we can also do other digital modes like System Fusion, 
D-Star & P25 as well as DMR if we want. 

Front View

    

                                        

Rear View

More to come on this VRM-650 DMR project as I get it completed and tested.
In Part #3 we will cover the conversion and hook-up of the MCS-2000 VRM-650 radio deck to use for the RF portion of the DMR repeater project.

This RF deck requires little overall modding and is pretty much a painless way to go without worrying about matching heads and cables that you might find with regular MCS-2000 radio packages. 

It just makes for a cleaner conversion and rack mounting.


All for Now - Comments Invited

SmØke out.....

Digital Mobile Radio (DMR) Part # 1

Home Brew - Kansas City Style !

Part #1

DMR is a another digital mode for hams. DMR is based on the international commercial radio standard. I could try and explain it, but the easiest way is to just have you look at: 

"The Amateur's Guide to DMR" by W2XAB

We here at BYRG World Headquarters have been experimenting in taking some of our older analog only radios and using some behind the scenes "Sm0ke and Mirrors" secret sauce to make a very versatile DMR compatible digital radio repeater.

The "Ernie Miller" Radio Chasis with a 

MCS2000 900 Mhz Transmitter & Maxtrac 800Mhz Converted to 900 Mhz Receiver. 

The network back end is done by the BrandMeister Network 
and it has some ties to the Allstar Network too.


The heart of the repeater is the MMDVM Modem/Arduino DUE and the Raspberry Pi
Controller and Network connection.

The wonderful thing about this is we can also do other digital modes like 
Fusion, D-Star & P25, and soon NXDN and be allowed to be cross-connected to our existing analog network too!

This is a work in process and no doubt be the way to go for the radios of the future.

Front View Before Painting
















               Rear View Before Painting






We will cover the 900 Mhz DMR project as I get it completed and tested at a later date.  

Currently, it is on the bench awaiting further connector interfacing.

All for Now  - Comments Invited

73  Dr SmØke