Mmdvm duplex vs simplex Whichever it hears, it will automatically go into that mode. If you have a dual band DMR radio, then you can monitor two time slot. Apr 29, 2019 · 1. Efficient Use of Channel: Half-duplex allows for bidirectional communication over a single channel, making it effective for scenarios where parallel transmission isn't required. 5,suit for Raspberry Pi Zero W. Jun 26, 2023 · MMDVM Duplex Hotspot suits for Raspberry Pi 3,Raspberry Pi Zero W,but NOT compatible with Rasberry Pi 4. 5500 RX and 438. Change default TS behaviour in simplex MMDVM_HS_Hat running Pi-Star or W0CHP and MMDVMHOST possible? The device supports duplex and simplex modes, and the OLED screen displays status updates in two colors. After the unit boots up and the MMDVM logo is displayed on the screen, the hotspot will open a 2. Setting up your BrandMeister Account Register at BrandMeister Network's website. Control Software section in the Configuration Page. For Duplex, you’ll also need to ensure you have a duplex “hat”, and you’ll want to know that the Hotspot’s RX and TX are the EXACT OPPOSITE of the ones you’ll configure on your radio. Works like a charm. On D-Star, in simplex mode this is the behavior; but when in duplex mode it works just Feb 7, 2019 · I don't recall you mentioning which duplex hotspot you have and what it's mounted on, but I'm guessing you have selected the proper Radio/Modem Type for it in Pi-Star General Configuration. Hierbei ist jedoch zu beachten, dass es zu Einschränkungen je nach verwendetem Microprozessor kommen kann. Aug 19, 2025 · Learn about the differences between simplex and duplex fiber cable connectors. 7456MHz dual ADF7021 FW by CA6JAU GitID #89daa20 This one apparently is. I am using an AURSINC Chinese MMDVM duplex hat with my Raspberry Pi 4. Now we need to choose what modes we want to use by using the little selector on whatever mode you would like, for this example we will just look at DMR. Hardware MMDVM hotspot hardware discussion. My question is when setting up a channel using the codeplug configuration tool should the DMR MODE be Simplex or Duplex when using a duplex hotspot? Feb 15, 2019 · I have since experimented and have build several simplex and a duplex hotspots using components picked up from the local MicroCenter and Ebay MMDVM boards from the far east. Why one over the other? Mine is simplex. 525 MHz for TX / RX in duplex and I can transmit fine, but no RX. I use the WPSD software rather than the traditional Pi-star, as WPSD has more features, and is most importantly, actively maintained. com reserves the Aug 12, 2018 · I did some more testing, and my MD-380 won't connect to the hotspot at all, when its in duplex mode (though its fine in simplex) Using the GD-77. Once duplex is enabled, it just appears deaf to everything on DMR but can get it to work with NXDN in duplex mode. Modem select: STM32-DVM/MMDVM_HS-Raspberry pi Hat (GPIO) Select Simplex Node (unless you are running a duplex MMDVM hat) Click or tap Apply Changes. In simplex, it shows only Time Slot 2 as “green” and I can neither transmit or receive with that modem selection. Got myself a MMDVM V1. 1. 4. Oct 22, 2025 · Find many great new & used options and get the best deals for Simplex/Duplex Hotspot Main Board for MMDVM Digital Modem Box and 433 Antenna IC at the best online prices at eBay! Free shipping for many products! Duplex variant of MMDVM_HS_Hat. An example of this would be make -f Makefile. I just bought a mmdvm "hat" board for a Raspberry Pi I already owned. Learn more about it in this article. 5. 0 , orange pi zero ? Is there wireing diagram anywhere? Or what pins pi orange zero image is useing and should match MMDVM ? While purhasing orange pi i did not relized pin arragment is lot diffrent!! I have only one connector connected and other is not due orange-pi connector is very short. You can set the "DMO mode TDMA channel" setting on the Homebrew/MMDVM connector settings page (Advanced mode needs to Jul 12, 2021 · I have a "Jstvro" duplex pi-star hot spot. Talk about boards, duplex vs. After 1 minute the COS LED goes out but the PTT LED says on. Or, if you find a genuine Zumspot board for a good price, go for that. Case is not waterproof. If you switch to a duplex modem, you will need to choose the correct duplex modem from the list in the WPSD configuration page, and it will automatically enable timeslot 1 and timeslot 2. We need to select MMDVM Host. This is very important for a country where DMR is widely spread, e. At a litytle extra cost a duplex hotspot with two radio chips are superior as it allow the hotspot to operate on both TDMA Jan 25, 2025 · I have requested and received an NXDN ID and have set it both on the radio and in the hotspot. One use case for a duplex modem is to monitor a talk group on one time slot while talking on a different talk group using the other time slot. Amazon. I Jul 7, 2024 · I created a new 3. I found a lot of info on the logical setup of these devices and very little on the physical setup. 2 Raspberry Pi All Edition GIPO 4. I also happen to know that the design of the MMDVM_HS_Hat uses inexpensive TCXOs to provide frequency and timing references. It Only matters if using duplex install and /or if any tg rewrites are added. ini file from a while ago, when there was always a direct DMR master connection. g. Instructions indicate using the STM32-DVM/MMDVM_HS - Raspberry Pi Hat (GPIO) modem choice. Enter your desired frequency in Radio Frequency. Nov 8, 2023 · Can someone explain to me pros and cons of simplex vs duplex hotspot. Set the same freq as Radio Mobile, for example: 433. simplex, antennas, cases, displays, and radios. Some more documentation particularly around advantages of a duplex board for DMR, recommended accessories (Pi-Zero WH, power supply requirements, OLED screen and case) with screen shots of pi-star setup would help buyers choose this over the many cheaper MMDVM hotspots available. I have a full duplex MMDVM hat on my PiStar with split frequencies set up. It is a small radio, that has built in WiFi and Bluetooth. Explore our in-depth review of the MMDVM Duplex Hotspot Board. Even if you want to use Duplex eventually, I recommend starting with Simplex Mode, as it will be easier. Once the timeout is reached, it will go back to idle mode. 2K subscribers Subscribe Mar 26, 2022 · AURSINC MMDVM Hotspot USB HAT Board for Simplex & Dual Band Hotspot & Modem RPT Hat Support DMR DSTAR BlueDV | Compatible with Windows Linux Android System | BER, DMR, TX & TCXO offset | MicroUSB Port If you were buying or building an MMDVM Hotspot, would you go Simplex or Duplex? Why? Would any operating uses (applications) influence your advise? Would it matter if the Hotspot were used for either DMR or D-STAR? N5BOC MMDVM DOCUMENTATION Link to Schematic of DUPLEX board Link to SETUP instructions for DUPLEX board Link to LED definition of DUPLEX board Link to How to Update FIRMWARE on Either SIMPLEX or DUPLEX boards Link to BlueTooth LE and Serial Interface board setup instructionsLink to AMBE Hardware Encoder design files N5BOC MMDVM DOCUMENTATION Link to Schematic of DUPLEX board Link to SETUP instructions for DUPLEX board Link to LED definition of DUPLEX board Link to How to Update FIRMWARE on Either SIMPLEX or DUPLEX boards Link to BlueTooth LE and Serial Interface board setup instructionsLink to AMBE Hardware Encoder design files Satellite communication has revolutionized the way people stay connected in remote areas, at sea, or… Jun 19, 2018 · Hi I have a duplex too. It's all a bit confusing dualband, simplex, duplex naming conventions with different boards abilities depending on supplier. I have verified that the modem does indeed support VHF. whether i change to duplex-mode i have a problem. Do you want a simplex single radio high powered hot spot or are you building a full duplex repeater? Something like this coupled with a CDM-1250 would work Feb 13, 2022 · Note that, at least the UHF band, is defined as duplex -- that implies setting up a repeater split (separate Tx/Rx frequencies). LONESTAR ELECTRONICS ( N5BOC Store ), US maker of MMDVM modems both Simplex and Duplex which become the engine of hotspots running PiStar for DMR, Dstar and Fusion. Controller mode, Simplex node. Click Apply Changes. 2 20201108 14. The duplex boards have one immediate advantage over the simplex hotspots, which is that you can transmit even when your radio is in the middle of receiving. Moving onto DMR, after very methodically tuning, I got DMR TX to pretty much work, and RX mostly worked in simplex/DMO mode, but worked only 10% of the time in full duplex. It is good for DMR begineer. Brandmeister says they blocked this configuration so I'm trying to figure out how to make this work without a 6-digit repeater DMR ID. However, the two frequencies I chose are around 20mhz apart. This, and the pricing, made me decide to buy no further OS but to buy some MMDVM modems for the Raspberry Pi working under Pi-star. Duplex operations in hotspots have two antennas, is that correct I setup a duplex mmdvm with pi-star using different TX/RX frequencies and setup some channels on a at-d878uv reversing the TX/RX frequencies. Place your QTH latitude in Latitude. 1 20231115_WPSD 14. Go duplex if you use DMR, otherwise, simplex is more than adequate. I have the RX freq set to 430. all good. Customization: They are using home-brew 3D cases that look fantastic! Its a unique option and I love it. Feb 19, 2025 · Overall, if you want a portable and efficient MMDVM hotspot, this one gets the job done well. DMR radio is an Ailunce HD1. I do suggest researching which network your local repeater is on, however, if your intention is to talk to other local hams. My only real familiarity is with D-Star, I just got an FT-991 and am learning the Wires-X system. Sie unterstützen damit grundsätzlich alle digitalen Modi, die in der jeweils aufgespielten Firmware Version unterstützt bzw. Nov 16, 2025 · MMDVM BUYERS Although the MMDVM Dual (full-duplex with separate transmit and receive radios) is an open-source hardware design board, locating a board with the full-duplex open-source implementation, and especially a full-duplex implementation that is endorsed by the MMDVM developers, can be difficult. . We would like to show you a description here but the site won’t allow us. ini Startup Options A Special Options String Direct Mode Operation (DMO) The UK's Phoenix Duplex hotspot User's Manual v2020 12 23 #MMDVM Duplex hotspot User's Manual _v2020_12_23 #MMDVM About this item MMDVM hotspot supports UHF VHF, frequency range: 144MHz-148MHz, 420MHz-475MHz, 842MHz-950MHz (depending on ADF7021 and TCXO, HAT firmware amateur radio brand license restrictions) Aursinc mmdvm hat supports Raspberry Pi 4, 3B, 3B +, Pi Zero W, Pi Zero 2W, compatible with NanoPi NEO, Orange Pi, compatible with BlueDV (requires USBtoTTL or Bluetooth model). I tried it with my DMR and Yaesu radios and was able to make it through to my networks just fine using 2M. my country The Netherlands. 96inch OLED display, 3D print case 5V2A MicroUSB power supply cable Feb 24, 2021 · You don't use the MMDVM hat/RF portion, and would need two Part 90 radios that can handle digital transmissions, but then you have an actual digital repeater. I get my generic Chinese MMDVM_HS_HAT_DUPLEX pi hat from aliexpress Contents: Pi-Home My Pi-Star settings for VKDMR Local Dashboard and Log Monitoring Hotspot/Dongle Frequencies ZumSpot Setup Source Archives Firmware Update Pi-Star Update Dialogue A strategy to set up a Pi-Star as DMRGateway for Australia Homebrew repeater protocol Startup Options for DMRGateway MMDVM. 5%. Support:D-STAR, P25, DMR ,YSF and work with UHF,enables the different mode of digital two way radio to communicate with each other. 3 J-STAR For BPiM2, BPiM2z 4 My duplex RPi hat isn't talking to my radio (simplex mode works fine) pistar-mmdvmhshatflash output: Selected Modem: MMDVM_HS_Dual_Hat (DB9MAT, DF2ET & DO7EN) for Pi (GPIO) Connected Hardware: MMDVM_HS_Dual_Hat-v1. They can do everything Pi-Star/ WPSD can dish out including Yaesu System Fusion (YSF), DMR, D-STAR, P25, NXDN, M17, POCSAG paging, YSF-to-DMR, YSF-to-NXDN and YSF-to-P25. But The hotspot came configured with a "MMDVM_HS_Hat (DB9MAT & DF2ET) for Pi (GPIO)" as the configured radio/modem type. 3 J-STAR For BPiM2, BPiM2z 4 When I run the duplex hotspot, I can't get five feet away from it without sync/connection issues. 4″ Enhanced Nextion Touchscreen**Please note that connecting the Nextion screen to your set-up may require additional soldering of pins or wires not covered in these case System Fusion Differences in Duplex and Simplex: In Duplex mode, have 2 time slots, and Tx and Rx can do at the same time Radio Frequency: In duplex mode, support 430-440 uhf, in simplex mode support both uhf 430-440MHz and vhf 140-150MHz Best adjusted: TX =0, RX=0 need no offset. Second, you'll want to pick a frequency that is relatively free of noise within your home. Support : MMDVM hotspot TCXO 14. aktiviert wurden. Definitely not part 90. 3. Apr 14, 2021 · Below are some frequencies you can choose from (in the US), dependent on a few factors. Does the moden support duplex mode? I don't see a STM modem that mentions duplex mode More info in Nov 25, 2024 · Low-power simplex devices for personal use. MMDVM Duplex Hotspot. A simplex modem only supports one time slot. Duplex would be helpful if you're going to share it with other people, though. At this time, the [DMR Network] section has significantly changed ! Simplex is likely fine. 2: features, real-world use cases, and why it's perfect for amateur radio enthusiasts. Edit Duplex=0 for simplex hotspot, Duplex=1 for duplex repeater. I've listened to the output of the GD-77 (on another DMR handheld) and its continuing to transmit on the Rx frequency of the hotspot. Jan 1, 2021 · I have it tuned up as s simplex node (according to the band plan, and 300kHz from the DMR hotspot) with 0. 450 MHz would use a receive frequency of 433. It's a bit simpler to grasp in the grey matter. 96 OLED Display Support P25 DMR YSF NXDN DMR Slot 1 + Slot 2 for Raspberry Pi, Pi Zero (with OLED) Sep 6, 2023 · About this item [Latest Firmware Version] MMDVM Duplex Version V4. 5" Duplex Display interface with Nextion Editor, I placed it on Raspberry Pi 3B+ with MMDVM Duplex Modem card and NX4832T035 Display in a Fan box that I created on a 3D Printer. The Raspberry Pi Model 2B allows for wired connection to the router, while the wireless module supports connecting via WiFi. The device is powered by a 5V mobile charger or USB cable connected to a computer or laptop. Case kit requires assembly. 525 / 447. If a repeater is available it should be used in preference to a hotspot. In simplex mode support both Uhf and Vhf. 3 Difference in Duplex Simplex 4 MMDVM Setting guide 4. I was also struggling with my Duplex MMDVM Hotspot Support C4FM/DMR/DSTAR P25 With Raspberry Pi 2B+ and my Radioddity GD-88 DMR radio. 4Ghz “Pi-Star-setup” WiFi network that you can connect to using May 8, 2022 · Update: The original links for the MMDVM board and C4Labs case are no longer valid. Nov 26, 2023 · Unterscheidungsmerkmale Die meisten Hotspots basieren auf der Firmware und Host -Software MMDVM von Jonathan G4KLX. Support:DMR,D-STAR,P25,C4FM,YSF and work with UHF in duplex mode. A hotspot is useful for areas that do not have easy access to the local DMR repeater. I have the RF & Net hangtime set to 20. I know from setting up GB7KH that getting this correct takes patience. Oct 13, 2023 · Amazon. [Easy Setup] Preload sofeware Pi-Star on TF card, no need to download again. Clear descriptions of how their “Basic Spots” are JumboSpots. ) This is the source code of ZUMspot/MMDVM_HS firmware for personal hotspots (ADF7021 version of the MMDVM firmware), based on Jonathan G4KLX's MMDVM software. The board introduces an integrated receiving SAW bandpass filter centered at 432,92 MHz. Jul 12, 2021 · I have a new MMDVM pi-star duplex hotspot. The radio modem is set to STM32-DVM / MMDVM_HS - Raspberry Pi Hat (GPIO). When I run the simplex one with the exact same settings but only 1 frequency, I can go anywhere in the house. Now I just run it on simplex, and haven't had any issues. 96 OLED Display Support P25 DMR YSF NXDN DMR Slot 1 + Slot 2 for R Pi 1, 2/2b, 3/3b/3b+, 4/4b, Pi Zero, Zero 2W with USB Port (with OLED) Nov 15, 2024 · Section 1: MMDVM Hotspots are single channel simplex units. Apr 30, 2020 · A duplex modem does not have that problem. Apr 8, 2016 · How can I do that?” Only duplex modems support two timesots (1 & 2). Jan 31, 2023 · I'm considering getting into DMR and have been looking at Bridgecom options, both Anytone radios and their Skybridge Hotspot. It will stay in that mode until that mode goes idle, then there is a timeout setting. I note that their hotspot has only one antenna, which as I understand things, would be SIMPLEX only. This means that you can easily unlink from a busy talkgroup even when the hams using the TG don't leave gaps between their transmissions. If a hotspot is operating full duplex, the receive frequency on the hotspot should be 5 MHz lower. I’m in NorCal (SF Bay Area) and the frequency coordination for digital modes is governed by NCDCC NCDCC has a set of unprotected frequencies to be used with digital hotspots, but all of them are 431. Modem select: STM32-DVM/MMDVM_HS-Raspberry pi Hat (GPIO) How to program a simplex hotspot for multiple DMR networks using Raspberry Pi, Pi-Star & MMDVM Frugal Radio 18. This firmware supports D-Star, DMR, System Fusion, P25 and NXDN digital voice modes and POCSAG 1200 pager protocol. I've used the INADVM boards on the Arduino DUE, the Repeater Builder boards and also the cheap chinese STM-32 based boards. 5 Inch Colour Screen: This MMDVM hotspot board digital voice modem features a 3. I had it working simplex once, but I have switched back to duplex. Sep 19, 2019 · The advantage of half-duplex at this time is reflected. May 6, 2025 · Ask questions, share tips, and troubleshoot Pi-Star installs and configurations. For example, a full-duplex hotspot transmitting on 438. Simply put, it’s your Internet gateway to a particular digital network of hams. I have a few questions when using it in duplex mode. General Configuration Only change the following Leave Hostname as is Enter your callsign in the Node Callsign field (just your callsign and no extensions). Mar 12, 2023 · File history Click on a date/time to view the file as it appeared at that time. I have both Simplex and Duplex MMDVM hotspots built upon Raspberry Pi Zero 2 W boards with eBay sourced Hats. Double check that it will fit your Pi model and MMDVM board. I have a very standard raspberry pi based hotspot, with a simplex MMDVM hat. 1 What I Made 3. Discover key features, benefits, and real-world applications for digital ham radio users. It's identical in size to the Pi Zero, fits in all of the same cases, and has performance that's much closer to a full-size Pi 2/3. Select the best choice related to the type of MMDVM board you are using and then click save if needing to change to Duplex as Simplex is the default setting or can skip clicking apply since it is defaulted to Simplex and move to the next step. ini. MMDVM Dual Hotspot Setup (Duplex) A novice in DMR can struggle to set his Duplex MMDVM Hotspot to work correctly in the duplex mode with his radio to be able to monitor simultaneously two different talkgroups (TG). MMDVM Simplex Hotspot. 9 Edited the background image, dimming down the bright white spots to blue to make them less distracting. 2 with USB Port (with OLED)+MMDVM Hotspot USB HAT Board for Simplex & Dual Band Hotspot & Modem RPT Hat Visit the AURSINC Store Hey folks! Got a YSF/Wires-X question. in Simplex-mode i can join Brandmeister network without problems. 5 inch colour screen with a clear display that allows you to get a more accurate picture of what is Jun 26, 2024 · About this item Excellent Components: This MMDVM hotspot spot radio station is made of excellent components, with temperature compensated crystals, over long periods of time, low BER, and support for simplex mode. Half duplex Half-duplex mode of operation is similar to full-duplex, but because it is "half" duplex, it is definitely different from full-duplex. As long as they're unused, is that going to be a problem? It seems Jun 26, 2024 · About this item Excellent Components: This MMDVM hotspot spot radio station is made of excellent components, with temperature compensated crystals, over long periods of time, low BER, and support for simplex mode. *MHz and there is no room for a conventional 5MHz offset. Simplex modems (which are most modems) only support one timeslot; which is timeslot 2. Neuere Hotspots verwenden Hi folks. Aug 29, 2022 · Re: Dual band 2m 70cm simplex MMDVM hat by AF6VN » Thu Sep 01, 2022 2:17 pm G6ZKC wrote: ↑ Thu Sep 01, 2022 8:18 am Thanks for all the replies. When OS decides to put a duplex modem on the market I will consider to Choose 6 -USB Duplex MMDVM : Duplex MMDVM board Choose 7 -USB Duplex with OLED : Duplex MMDVM board with oled display Choose 8 – mini Duplex Choose 9 – mini Duplex with oled Choose 10 – mini Duplex with oled and case Choose 11 – nano NEO single MMDVM Choose 11 – nano NEO single MMDVM with oled Oct 22, 2025 · Duplex Hat Hotspot Main Board for MMDVM Digital Modem Box Support Raspberry Pi and BlueDV. These channels are to be used on a first come, first served basis with emphasis on sharing to the degree possible. 1 Contact me Now 2 Discuss group 3 MMDVM'S Project information 3. Accounts Getting a DMR Radio ID Register at RadioID to get a DMR Radio ID. The Boomerang PLUS requires an ethernet connection to setup the wifi. My hat is off to those who make it work. Simplex MMDVM boards work on one frequency at a time—they either send network traffic or receive radio signals, but can’t do both at once. 3 Flash Pi-Star OS 4. 7456MHz dual ADF7021 FW by CA6JAU GitID #cc451c4) ". Radio Frequency: UHF 430-900MHz, VHF 144-220MHz. 4" Nextion Touchscreen (included). I know the Anytone is TX on it's programmed freq. The openSPOT forwards everything it receives from the server to the transceiver and vice versa. Sent via smoke signals from my SM-G935F M1DNS (Admin) May 19, 2020 · Wireing MMDVM_HS_HAT_DUPLEX, 2018 v. After rebooting the system, I saw that the device now reported itself as running MDVM_HS_Dual_Hat-v1. I'm using the MMDMV_HS_Dual_Hat by Florian, DF2ET, Mathis, DB9MAT, and Andreas, DO7EN, and the LoneStar MMDVM Duplex by Dave, N5BOC. 2. It is available as both a simplex (more common) or duplex device as well as in VHF or UHF, or even dual band configurations. It's an mmdvm duplex hotspot running pi-star. It works great in simplex mode, but when I change it to duplex mode, it does not respond to any transmission I make. Jan 27, 2024 · A duplex modem allows you to use time slot 1 and time slot 2 on the hotspot. but if i transmit from my HT the hotspot protokoll says: "Downlink Activate received from DO8SEB" but nothing MMDVM Configuration file Since I mainly use DMR, only the DMR functionality is explained WARNING : this is a MMDVM. Hence my confusion about Simplex mode (from stuff I've read on the forum, I get the impression duplex boards don't support simplex operations since the receive antenna would be picking up the transmit antenna). 4625. The MMDVM does not response to either TX freq. 1 or 2 radios with a 9600buad port, or a discriminator tap. Also DMR is pretty fiddly to home brew a duplex repeater station with timing and waveform generation and demod. When I do "sudo pistar-findmodem", I get " Detected MMDVM_HS (GPIO): /dev/ttyAMA0 (MMDVM_HS_Dual_Hat-v1. Controller Software: select MMDVMHost Controller Mode: select Duplex Repeater. Pros Works well with multiple digital modes like DMR, D-STAR, P25, and YSF. Share reviews, recommendations, and troubleshooting help for building or upgrading your hotspot. Great way to roll your To build the firmware, use the make command, followed by -f and the correct makefile, followed by the type of board you are using. I'am assuming that's needed only for updateing mmdvm? I get after I noticed after a while, that my BER percentage of my MMDVM_HS_Hat and Pi-Star setup was significantly higher than other users, at around 3. It connects Dec 23, 2021 · Hey all, Received my pi-star duplex hotspot from eBay about a week ago and can’t get it to connect when in duplex mode meaning I can not use TS1 on DMR+ When in simplex mode I can access and connect to the server and to the reflectors on TS2 but since it’s simplex TS1 is disabled and this disables all TGs on slot1. 3. com: Duplex mmdvm Hotspot Board hat OLED Two Timeslots Two Colors Yellow Blue OLED Low BER 0 Offset Tf Card Written Pi-Star Software : ElectronicsAmazon. com Return Policy: You may return any new computer purchased from Amazon. 2 Orange Pi 4. I have an Anytone 878UV II 2 and have programmed a couple channels to the freq listed and also the same TG with reverse freq as listed and created Zone for this setup. STM32FX mmdvm-hs-hat-dual for a full duplex modem hotspot, attached to GPIO. On WPSD that gives me a seven digit mask beginning with an 8. 550000MHZ Aug 12, 2022 · After setting up the MMDVM duplex hotspot board, it is necessary to adjust the transmit and receive offsets in the MMDVMHost expert editor section. I think you are confusing three different DMR concepts: simplex/duplex hotspot boards and Tier 1 vs Tier 2 and also timeslots. But simplex implies that only one time slot can be handled at a time, whereas duplex can receive on one time slot while transmitting on the other slot. GENERAL section. I also think your question should be directed to some mmdvm group instead as pi-star is Jul 15, 2023 · The openSPOT is a simplex device, and it reports this correctly to the server. I think the COS is an indication of incoming signal, so Radio Mode is Simplex mode. Cost-Effective trueGood day! I'm in a bit of a quandary. Includes a 2. Aug 21, 2021 · simplex repeater with no OLED display simplex MMDVM repeater with OLED display duplex MMDVM repeater with no display Raspberry Pi Zero WH (W – wireless, H – soldered header – pins to connect together with the repeater) Case (the one from the picture probably is too small for the set) Optional OLED display Important! Sep 4, 2024 · I went back to the WPSD configuration, and set the modem mode back to Duplex and the type back to the MMDVM_HS_Dual_Hat option that I had originally expected to work. I looked up my local amateur band management information and found a couple of unused frequencies. May 16, 2020 · Duplex Hotspot Reliability Revisited Last August, I presented a solution for the “lost transmission” syndrome when using an MMDVM duplex hotspot. This seminar will aid a casual DMR user in connecting an Anytone DMR radio to the PNW DMR Network, via a Pi-Star-based MMDVM hotspot. 4" Color Screen - Raspberry Pi 4B : ElectronicsAbout this item This hotspot easily connects your digital ham radio to digital networks on all of these modes: DMR, DSTAR, YSF, NXDN, P25, M17, and POCSAG and supports cross-mode operation between different digital modes “THE SAMPLE SCREEN PROJECT” This document’s goal is to help you start to build your own screens or modify existing screens . 2 J-STAR with HDMI Desktop for Raspberry Pi 4. As such, some calibration can do wonders for the BER on Oct 2, 2024 · MMDVM_HS_Dual_Hat-v1. Find out which one you should use in your fiber-optic network. Oct 11, 2018 · Simplex, in simple terms, basically means you can not transmit and receive at the same time, while duplex can (and hence the two frequencies, otherwise you'd have a feedback situation, duh). When using a hotspot, you need have your own callsign and DMR ID. (The modem will reset after you click Apply Changes each time and this is normal). So the hotspot will stay in that mode until the timeout is reached. Why you need a DMR Hotspot? May 6, 2025 · MMDVM hotspot hardware discussion. Jan 13, 2024 · The closest match to this is the modem in the Pi-Star configuration pulldown menu labeled as: MMDVM_HS_Dual_Hat (DB9MAT, DF2ET & DO7EN) for Pi (GPIO) I tried that configured as a simplex node and as a duplex repeater. 6. A lot of generic hats on that market, all fairly comparable in performance. I MMDVM Repeater V3F4 Functions: Build your DMR/YSF Digital repeater, hotspot use Analog radios, such as GM338,GM340,FT-7800, IC-2820, also support DR-1X, MTR2000, Tait Dec 20, 2019 · Std setup Simplex hotspot (DMO) doesnt care abt timeslot. SDRGEEK MMDVM Duplex Hotspot Check Price on Amazon I found the SDRGEEK MMDVM Duplex Hotspot to be a solid choice for anyone looking to explore DMR and other digital modes. The MMDVM will sit there listening for both modes. com: BridgeCom SkyBridge MAX MMDVM Hotspot - Dual Band - WiFi and Ethernet - DMR, YSF, D-Star, NXDN, P25, M17, POCSAG - 2. I have confirmed the Jul 7, 2024 · I created a new 3. I understand that the simplex hotspot can only support a single timeslot, and I understand that this defaults to TS2. This website might have the best explanation for you: New member, thanks for the admit. ini file In main menu click Amateur radio then Edit MMDVM. You need to enter own callsign, DMR ID, your repeater parameters and allowed modes. 5 inch colour screen with a clear display that allows you to get a more accurate picture of what is Nov 8, 2020 · MMDVM HotSpot: firmware for ZUMspot or MMDVM_HS based boards (D-Star, DMR, YSF, P25, NXDN and POCSAG) - juribeparada/MMDVM_HS Jul 11, 2025 · Half-duplex mode is a balance between simplex and full-duplex modes, providing dual communication but with some compromises in speed and performance. 0 dual antenna (not included), and 2. Been licensed for quite a while, but I was away from the hobby for a number of years. 1 Flash SD card (TF card)tools 4. 7456MHz I've tried various combinations, I've also flashed the firmware. - MMDVM digital interphone modem (hotspot) box, through which she uses ordinary digital interphones to realize national interconnection, solves the restriction of the connection distance of ordinary digital interphones. Contribute to phl0/MMDVM_HS_Dual_Hat development by creating an account on GitHub. I have a DMR+ network configured with the default DMRGateway rewrite masks setup. 17 20190529 14. May 20, 2018 · Firmware upgrade UserGuide for MMDVM HAT (Simplex/Duplex/Repeater) made by BI7JTA I want to upgrade from a simplex hotspot to a duplex hotspot, but puzzled with the task of picking an offset. 550 TX. Basically this corrects the transmit (TX) and receive (RX) frequency of the board, if they’re not on frequency. Jul 17, 2020 · Hello Community, i got a mmdvm dual hat with pi-star running. STEP 5. 0% BER. Broad Community Support Pi-Star has a massive global user base, which means: Plenty of online resources, forums, and tutorials are available. All I have done is changed from simplex 446. 1 Raspberry Pi BPi NanoPi 4. There are two groups of channels defined, one for simplex hot spots, the other for two slot full duplex devices which are typically found in newer DMR hotspots. It adds a slight bit of delay and sometimes misses your attempt to handshake. The hotspots are capable of multiple modes as well, such as D-Star, P25, DMR+, YSF and NXDN. If the settings above are correct move to the next page. com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. I can't suggest a specific premade hotspot, though. I've been using a loner simplex Pi-Star MMDVM and it is The MMDVM dual HotSpot (MicroRepeater) board as shown on the photo above has been designed in an attempt to improve the receiver's characteristics of a duplex (dual) HotSpot "hat" built arround two ADF-7021 single chip transceivers and STM32F103 controller. Mar 6, 2019 · The term you are looking for is high powered MMDVM hotspot. The same point is that point A can send information to point B, and point B can also send message to point A. It could be that I missed a setting somewhere, but I reconfigured it several times and could never get it to work. First, you'll want to make sure these are not in use already from a close neighbor. Insert you callsign. Several members of the 020 Digital Multiprotocol Group and I remain dissatisfied with our overall user experience. I've tested it on VHF and UHF simplex, and duplex UHF. The server should honor this and send only one timeslot, as in DMR simplex devices only use 1 timeslot. The FT-991 handles that just fine; but I still can't send any commands when the radio is busy. YMMV, of course, but I purchased a full-duplex mmdvm hat and it's never worked quite right with duplexing enabled (RPi 3B running Pi-Star). Adjusted RX/RX Offset while Amateur Radio Hotspot VHF & UHF Digital Modes By Rob Robinette K9OJ I use a few Chinese MMDVM_HS_HAT_DUPLEX pi hat + pi3 for all my digital ham radio needs. Oct 11, 2018 · In DMO/Simplex Mode MMDVM will pass all TS1 traffic as TS2 I am no expert on this stuff by any means, This is just a result of testing the indicated modes on my two D878 Radios Most hotspots operate simplex and should use one of listed frequencies for both transmit and receive. 2 with 0. About this item Full body coverage for Raspberry Pi (not included), Duplex MMDVM v1. 2 Pi-Star for BPi-M2/M5 3. Getting back to it. 4625 and the TX freq is 439. Nov 16, 2025 · The most recent hardware development for MMDVM is the availability of boards that have two radios and support full-duplex operation. I don't remember which one stays on or off, but it should easy enough to test with a dummy load and an antenna. 7456MHz dual ADF7021 FW by CA6JAU, G4KLX, W0CHP. the hotspot is joining the BM network and i can hear the talkgroups and OMs. Feb 13, 2022 · The issue is the duplex configuration fails as it is rejected by Brandmeister. Jan 12, 2023 · MMDVM stands for Multi Mode Digital Voice Modem. It’s not clear to me what Discover the AURSINC MMDVM Duplex Hotspot Module V1. AURSINC MMDVM Duplex Hotspot Module Dual Hat V1. Edit MMDVM. Duplex setups for full repeater functionality, enabling simultaneous two-slot DMR communication. 8 Changed "Duplex MMDVM Voice Modem" on MMDVM Pages from "Duplex" to "Simplex" for Simplex Layouts. A simplex node will use 1 radio A duplexed node will use 2 radios and will require a duplexer. Apr 17, 2018 · Bonsoir, pour la simple et bonne raison que sur sa carte MMDVM c'est cette interface qu'il utilise et non pas celui de l'OM DL. A duplex hotspot enables simultaneous communication on two frequencies, enhancing performance and reducing interference for better connectivity. Jan 23, 2020 · This is a MMDVM_HS_Dual_Hat hotspot in duplex mode with DMRGateway and an actual Pi-Star image. Apr 19, 2025 · Differences in Duplex and Simplex: In Duplex mode, have 2 time slots, and Tx and Rx can do at the same time Radio Frequency: In duplex mode, support 430-440 uhf, in simplex mode support both uhf 430-440MHz and vhf 140-150MHz Best adjusted: TX =0, RX=0 need no offset. What are you trying to do? By the way, I have found it very hard to get any answers out of this forum. Traffic will flow regardless of what tg it comes into the hotspot over rf and or the interwebs. 7456MHz dual ADF7021 FW by CA6JAU GitID #cc451c4 TCXO Value: 14. Unfortuantly, by far the majaority of hotspots in service are simplex, That is they have only one radio chip. Feb 29, 2020 · It connects your installation to the Internet, switches voice packets between the Internet and local radio equipment (duplex repeaters or simplex hot spots) and displays a dashboard full of status messages and indicators about the state of conversations it's working on. Fast assistance for troubleshooting. NB! For first system setting up and always use only simplex mode! Duplex=0 Oct 8, 2020 · So, why do I often recommend them? Transparency: Images of the inside of their units. 7456MHz , Duplex, Simplex, Simplex (NanoNEO/AIR), VR2VYE & BI7JTA Username >> pi-star Password >> Raspberry Let’s start at the top Control software. 4. 150MHz to 442. First define what you want to do. 1 GPIO Definition 4. I have configured the hot spot to 433. MMDVM boards come as either simplex or duplex, each with its own special features. I recently purchased a "full-duplex" Pi-Star. Here's a new link to an MMDVM board on Amazon. It doesn't matter what mode you use it on, though if you set it for more than one, Pi-Star has to do a "scan" to pickup the mode to use as you transmit into it. It works great in simplex mode, updated firmware and current pistar software. Quality options: DMRspot is one of the few who offer something special, and that is N5BOC MMDVM Boards from Texas, both simplex and DUPLEX MMDVM Simplex Hat , or Duplex Hat, RPi ZeroW/2W/BPiM2z, 8GC10 Pi-Star OS, 0. 450 MHz. 3 dulex hat and got it running on a pi4 with the latest pi-star image. Works great in simplex mode with NXDN and DMR, however I cannot get duplex working. May 24, 2024 · Micro SD card = Amazon MMDVM board = STM32-DVM OR Zum MMDVM OR Micro-Node TEENSY NOTE: These are NOT hotspot boards, they are different and built to interface with a physical radio. 1. I *do Configuring the Boomerang with your WiFi’s password Please skip steps A and B if your Boomerang hotspot is connected to your network using an Ethernet cable. Hi! I've recently gotten into dmr, and just set up my first hotspot. My question is about choosing tx and rx frequencies. This article is focused on the MMDVM board with dual (duplex) radios and the DMR protocol, operating on the Brandmeister network. RX and TX is fine. Half Duplex Mode Advantages of Half-Duplex Mode 1. I've built numerous. Feb 7, 2021 · But with a simplex device, it can't hear while it's transmitting, hence my preference for a duplex device, which is always receiving on the RX frequency. Il doit quand même avoir des différences entre la conception des cartes Duplex!!!!! A Multi-Mode Digital Voice Modem (MMDVM) Hotspot is built on a Raspberry Pi, sometimes called a Pi-Star.