MMDVM Simplex with improved layoutDesigned by N5BOC Store (469-378-5600), Ships from United States of America
What is it? This is a redesign of the standard SIMPLEX board I've been selling. I took the design practices of the DUPLEX board that enable it to work so well and ported them over to the SIMPLEX...Read More…
This is a redesign of the standard SIMPLEX board I've been selling. I took the design practices of the DUPLEX board that enable it to work so well and ported them over to the SIMPLEX board. For example this board has its own dedicated 3.3V regulator and does not pull voltage off of the noisy Raspberry Pi 3.3V line like all other simplex board do. This board is now a 4 layer board with LARGE ground planes for 3.3V and GND sandwiched in the middle. This acts as one very large decoupling cap the side of the entire board. Also this isolates signals between TOP side and BOTTOM side. Speaking of that all of the Analog RF signals are on the TOP side only and the high harmonic digital signals are all kept isolated on the BOTTOM side. Making this board much more stable. It should also make it more sensative on receive.
This board fully supports an OLED screen and the Nextion screen. I comes with a 432MHz ceramic antenna mounted on the board. But if you prefer you can dismount this antenna and install an SMA connector in order to install a standard antenna with some gain.
I find however the ceramic antenna is well more than enough when the HOTSPOT is in the shack with me or riding along beside me in the truck.
To bring the SIMPLEX board up to the same level of quality as the DUPLEX board I'm selling.
Implementation of good design practices and spending a little more on quality components. For instance the 4 layer board cost 1.5 times the price of a 2 layer board but it is key to many of the features that make this an improved design.
The most common question I get is which modem do I select from inside of Pi-Star. You should pick... MMDVM_HS_HAT (DB9MAT & DF2ET) for Pi (GPIO)
If you have an issue please contact me and I will do my best to resolve your issue by Email. If after a few exchanges the problem is still not resolved I will ask you to return the board to me where I will check it out on the bench. If there is a hardware problem I will either repair the board or replace it. If you think you've received a defective board you must contact me about it within 14 days. Anything that arrives DOA I will just replace as long as I have stock of that board. However out of over 500 boards shipped only 1 was truly DOA. The board itself has a 6 month warranty on it. If it fails within 6 months I will first try to repair it, and if I can't do that I will replace the board. Please contact me for an RMA # before returning a board. I mostly want people to be happy so I will admit I'm very lenient on returns.
While I am selling only a tested board guaranteed to operate as expected, I am not supplying the software, or a case or any kind of display. You can if you prefer order a very nice Turn Key version all in a case ready to go from my friend Brian K6BPM. He will even customize the software with your specific CALL, DMR ID and WiFi credentials. It truly is plug and play! Please see what he has to offer on his site. DMRSPOT on 27labs.com
Tom | June 6, 2019
Peter | May 5, 2019
Robert | April 27, 2019
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