* MMDVM Versus M17
* Comments to FCC re: AST SpaceMobile Claiming 430-440 MHz For Its Use Are Due Monday 2025-07-21
Zero Retries is an independent Amateur Radio newsletter, now in its fifth year with 2800+ email subscribers. Radios are computers - with antennas!
#hamradio #M17project #mmdvm
I finally figured out how to open talkgroups! Listening to this guy from Japan talking to a guy from Chile, and then an Australian trying to talk to a lady in Virginia. TG 91 is the 'worldwide chatroom' and it is living up to its name
#HamRadio #DMR #MMDVM
Self-designed tray to hold a ham radio repeater controller. Consists of a Raspberry Pi 3, Repeater builder STM32-DV MMDVM hat, radio connection cables, and a 12v to 5v buck converter. Ports up front for USB-C devices (namely portable routers), a Nextion display, and the suite of Pi 3 connections.
Motorola CDR700 repeater (two CDM1250 radios and a repeater controller aka RICK). This is a prototype controller build where I had front panel status LEDs and OLED instead of a Nextion LCD panel.
Almost done with it too. A replacement repeater controller for my old Motorola CDR700 repeater. Designed the case, filled it with a Pi3, MMDVM hat and power goodies. Final config today and tomorrow, goes into the repeater tomorrow. Purple is prod, grey is prototype. #RickPi #MMDVM #hamradio
A 3d printed tray holding a Raspberry Pi 3 and MMDVM radio control board. The tray is purple and the external display connector is orange, very audacious for ham radio gear.
Nextion HMI displays are going to be the end of me. At least the MMDVM RICKpi drawer thinger is finally at version 1.0 after many kg of filament used for test fitment prints. #mmdvm #repeaterbuilder #stm32-dv #nextion
Anyone happen to know the itinerant / backyard repeater frequencies for the Washington DC area in the 440MHz/70cm band? I have a repeater I would like to stand up for #shmoocon and want to make sure I'm not stepping in other in-use pairs. #dmr #mmdvm #cdr700 #cdm1250 #tmarc
Duplex multimode digital voice hotspot
Screenshot of Pi-Star Admin page
image showing the most excellent results of a successful hot replacement of filament in a 3d printed bracket.
-chef's kiss- No-stop filament change! Printing a bracket for a replacement RICK in Motorola CDR700, eventually to be populated with a Pi3 and STM32-MMDVM.
#hamradio #mmdvm #raspberrypi #3dprinting
A Ham Radio Hotspot for DMR calls.
The BI8JTA MMDVM radio board, RasPi4, 5v noctua fan, 3D printed case modified from Printables to fit everything.
#Ham #HamRadio #AmateurRadio #MMDVM #Radio #AnyTone #3DPrinting
![[BusySignal-KE2EFX]](https://cdn.bsky.app/img/avatar/plain/did:plc:nxwh7vs7qidjqeqzngdid5ri/bafkreiflvru7ffmfvluakf7kfckdqamiikazipbwuwq4a6qiyvepbxucb4)
