Tag Archives: raspberry pi

Getting Started with Pi-Star: From Hotspot setup to Memory Programming

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If you’ve been following my page for the last year, you will have seen at least a half dozen posts mentioning the Zumspot. It’s pretty much taken the digital amateur radio community by storm over the last year or so. I picked one up from HRO in Dayton/Xenia last year, had it up and on the air in a matter of a half hour or so – in fact it takes longer to assemble the case to put it in. For those unfamiliar, the Zumspot is a board that’s about the size of a stick of gum, it’s designed to work the the Raspberry Pi (the kits even come with a Raspberry Pi Zero to use it with).

The point of the Hotspot is to get you up and on the commonly used digital voice modes even in areas with no repeater coverage. They cover D-Star, DMR, C4FM (or Yaesu System Fusion), P25, and NXDN. In a lot of areas there is no coverage of any of these modes, less all of them, so for someone interested in trying them out, but not crazy about the idea of building up a whole repeater just to play around with the mode, these are a very cost effective method of getting into the mode, starting off at around $140 from Ham Radio Outlet for the whole Kit. It fundamentally works by receiving your RF signal in whichever digital mode/modes you choose, and transmitting it via the internet to the desired Reflector/TalkGroup/Room you choose.

A lot of people I know that have these have had the occasional hiccup with setup, or memory programming – I can sympathize with that as when I started this, I think I played around with the software for hours before it finally worked. Admittedly I’m unsure if the board even works with other software, as these boards all come with a memory card preloaded with the Pi-Star software, however having used other software such as Western Digital’s with other hotspots, I will say that Pi-Star is a much more straight forward, user friendly interface that, for the average user with no past experience with this type of thing, is pretty much just the way to go in the current digital radio landscape.

Let’s get started!

The first thing that we’re going to need to do before all else is insert the SD card that comes with the Board into the computer – this comes preloaded with the Pi-Star image which makes this easy. From there we can get you set up for wireless Internet connectivity. The Raspberry Pi (any model after the original) has built-in Wi-Fi, so what you need to know is your Wi-Fi’s SSID, or display name, and your password. Once you have that, we’re going to head over to https://www.pistar.uk and the website will look as it does below:

From here, we’re going to select the option in the left-hand column that says Pi-Star tools, and that will give you a drop-down menu, select Wi-Fi builder

It will bring you to the screen below – it provides good instructions on what to do from here. You enter your Wifi information in the circled area, and it will generate a WiFi configuration file that we will the drag and drop on to our Pi-Star memory card, and get the device up and running!

Let’s locate the file that we’ve created (should be in your downloads folder), we’ll drag and drop that into the SD Card that has our Pi-Star OS on it. For this piece simply follow the onscreen instructions, this is very well documented and easy to setup.

Once we’ve done that, let’s eject the card from the PC, insert it into our Raspberry Pi with our Zumspot board attached, and plug in the power! Be sure that you’re utilizing the Micro USB Port labeled for Power, if you’re using a Pi-Zero there are going to be two set right together – the outer one is the one meant for the 5v Power input. Wait about 30 seconds to a minute after plugging in, and then go to your PC/Tablet. If you’re utilizing a full computer, go to your internet browser and simply type http://pi-star however, if you’re utilizing an Android or iOS Device, go to your browser and type pi-star.local – after you click go/hit enter you’re going to be redirected to the “Dashboard”

From here, to begin setup, you’re going to go to the “Admin” button on the top row

You’ll be prompted for a username and password as it shows above – the default is as follows:

Username: Pi-Star

Password: raspberry

The first thing you’ll want to do before setting at configurations is fetching an update for the latest Pi-Star software, this will have any types of stability patches, security updates, etc.., so make sure you click the “update” tab along the top bar. It’ll run its course and reboot.

Once we’ve done our update, go back to the “Admin” tab to get setup! It will bring you to the following page once you select Admin

This is where the confusion comes in – what type of software are we having Pi-Star act as? MMDVMHost or a D-Star Repeater? Well, this I guess is only confusing for those that are D-Star ONLY users, but even if you’re using it exclusively for D-Star, you need to select MMDVMHost.

Below you’ll see the MMDVMHost menu, and it’s here that you select what modes you’ll be using – I use YSF (Fusion/C4FM), D-Star, and DMR, so I have all of those selected as active as you’ll see, and then click apply changes.

Next, you’ll input your Callsign, as this is what the node will need to be assigned to be able to transmit over the gateway, and your CCS7 (or DMR) ID. This post is assuming that you have both registered your call, and gotten a CCS7/DMR ID, if you have not locate your closest D-Star Repeater and see if they’re setup for callsign registration, and go to http://www.dmr-marc.net/ to obtain your CCS7 number. After that you’ll pick a frequency – BE SURE YOU’RE IN AN OFF SECTION OF THE BAND! Last thing you want to do is be in the middle of the satellite downlinks or something, and mess with someone’s Sat. contact. If you’re interested in utilizing DPRS to transmit your location with each transmission, as well as mark the location of your hotspot, you’ll enter the latitude, and longitude of your hotspot, and the location data it asks for below. In order for it to communicate effectively with the Pi, as well as to identify what you’re using over the gateway, select the drop-down menu for “radio/modem type,” and select your corresponding hotspot setup (as you’ll see mine is the Zumspot/Pi-Zero).

Another thing to note in the photo below is that each mode is already configured. When you check the various boxes for the particular modes after your information is in, there isn’t a whole lot else to be done. With DMR, specify that you’d like to utilize the gateway, and enable the brandmeister network, and you’re pretty much good to go. For D-Star you can choose a default reflector to link to on startup if you’d like, or if you don’t want to have it automatically link, just leave it where it’ll default to – should say REF001A and the manual box will be checked, meaning you have to tell it to link to the reflector. With Fusion, you just select a room to link to, and you’re done.

Click Apply Changes, and now, we’re ready to use it! When you save your settings, it should automatically reboot, you’ll lose your connection to the device for about 30 seconds to a minute, and then you’ll be back up and running, and ready to go! Now, it’s time to move on to the radio side..

D-Star with the Kenwood D-74

With D-Star the memory functions can be a little tricky, and while this is likely the most functional mode of all the commonly used ones today, the initial programming with an Access Point is a little tricky – the thing to remember is that we need to treat a hotspot just like a repeater, down to programming with an offset and everything. The kicker is that there is NO offset, so we have to remember to set the frequency shift to +/- 0.00 MHz. If you don’t do this, your memory will be tagged as skip, meaning any time you rotate the dial to access the memory, it will be skipped over in the repeater list. As follows are the step by step instructions for programming the Kenwood D-74. Other radios such as the Icom ID-31/51/5100/7100 all use very similar memory functions, the key point to remember with all of these radio’s is to set that +/- 0.00 MHz offset, otherwise it will not work with any radio.

Choose Write, and you’re all set! You’re on D-Star via Hotspot!

DMR with the CS-580

Programming your DMR HT is very straight forward – all that has to be done is presetting a memory bank for the Hotspot, and programming each Talk Group you’ll likely use in a separate channel. Set the TX/RX to the same frequency in the memory channels, and vary each one for each talk group. With the hotspot, while you can program an “unlink” command, it is not necessary unless you plan on just utilizing as a simplex repeater, every time you key up a new talk group, the Hotspot unlinks from the previous group, and links to the new one automatically. Below are step by step instructions for programming the CS-580 (BFXD HT), your mileage may vary as I only have DMR experience with this radio, and I’m unaware of how the software for the TYT MD-380, or Hytera radio’s works in comparison.

Save, and Write the Data to your Radio… We just have one more step! In a lot of cases the DMR radios that people use are Chinese radios that are cheaper, and not necessarily as clean on the spectrum.. So to accommodate this, we’re going to go into our expert settings, and open up the TX/RX sensitivity of Pi-Star.. This is done by clicking the Expert option at the top of the Admin menu.. You’ll be brought to the screen below:

You’ll be brought to another screen where the second orange line down says “Modem” – this is where we configure the offset sensitivity. We’re going to open that number up from 0 on both to -475 for both TX and RX as you see below

All other data can remain as is. Apply your changes, and reboot, and you’re up and on the air with DMR!

C4FM (System Fusion) with the FT-70D

Admittedly my experience with fusion at this moment is limited to dashboard control, and the little FT-70D, however having just gotten an FTM-400 I hope to change that soon. Fusion can be linked to rooms through direct input or dashboard, however up until recently the FT-70 did not support direct input. Programming is very simple however, be sure that your callsign is programmed into the radio, set the frequency for the Hotspot in your memory as a simplex frequency, and set the mode to digital. Write the memory, and you’re good to go! For the most part that is, from the Admin page on the Pi-Star dashboard you can change the room you’re linked to, and find out what room is which assigned number. When you know the corresponding numbers, you can program those into your radio, or directly input them to link to those rooms. If anybody has more information on programming radios for Hotspot use with C4FM, please feel free to comment.

Write it to memory by pressing F followed by V/M, press it again and type out what you’d like to name the channel, and press again to write, and you’re on the air on the Hotspot with Fusion!

I hope that this has been an informative post, and can be used as a tool for you in the future! And to make it easy to access in the future this will be a permanent link in the menu bar – this will remain a fluid post updated as new information comes along, but for the moment this is as up to date as can be!

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Mmmm… Pi….

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If you’ve talked to me at all about computers, you know that I love these things. Or if you read my previous post about DV hotspots in Amateur Radio, you must have noticed that I mentioned a device called a Raspberry Pi. In the post I discussed the Pi Zero briefly. Today I just want to quickly go over what a Raspberry Pi is, and why you should have at least one if you want to play around with any technological concepts.

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Pictured on the left is a model B+ of the original Raspberry Pi board, and on the right is the more recent Raspberry Pi 3 B board.

The Raspberry Pi is a credit card sized computer. It has a handful of ports – 4 USB, 1 Ethernet, 3.5mm Stereo, HDMI, Micro USB (for power), Micro SD card slot for storage, 2 ribbon cable slots on the board (1 for camera, and 1 for a display), as well as a 20 pin GPIO.  They upgrade the memory on them between releases, and the Pi 3 is a lot more powerful than the original Pi was for sure, in addition they now have built in WiFi and Bluetooth where as before you had to get a USB device to have the capability. In addition, via the ribbon cable port you are able to convert it into the functioning touchscreen computer below.

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What purpose does this serve really though? Why should you want one of these? There are a few things that can be done with these for sure – I have primarily used them in radio applications for running hotspots, and logging, however I am in the process of building a media server off of one as well (been a long process, just need to pull the trigger on some storage, and it’s ready), which will allow me to have the entirety of my music, photos, and movies stored on it, and will make it accessible from anywhere. Pretty neat, right? All off of a board that’s the size of a credit card. You can tie them in for home automation, security systems via the camera port, media center boxes, and any hardware tinkering you want to do, you can fiddle around with the GPIO – check out the people that have built robots and drones with these, they’re really cool. They’re a sandbox for technological play – pretty much any concept that you have you can probably fill in with one of these.

In addition to the Pi, there is the Pi Zero that I mentioned in a prior post. That is a board only slightly larger than the size of a stick of gum. It has 2 micro USB ports, one micro HDMI, a ribbon cable port for a camera, and an SD card slot. That is it. I don’t have any photos, but you can check them out here. This I haven’t really played around with too much, but it’s a slimmed down, bare bones version of the Pi, meant for you to be able to play around with for single uses.

What’s Next? – How about a little digital talk?

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Field day is but a week and a half away at this point, and my radio is setup as one of the main stations, and as I live in a smaller apartment space, setting up, and breaking down is a process the way I have everything wound up, so I will not be on the air for another couple of weeks… from home at least, I always have the mobile. And I guess I should specify on the air for sideband – I do operate the currently dominant digital protocols as well, so I’ll be on D-Star, Fusion, and DMR.

On the note of digital, why don’t we discuss a little device that has become the be-all, end-all of digital hotspots, the ZumSpot. For those of you that don’t know, the digital protocols that most all major radio manufacturers produce at least one radio for now are pretty reliant on the internet when it comes to their extended features. Sure, you can talk D-Star, or DMR simplex, and you can use the repeaters locally if there are other people in your area with the ability to use them, but where’s the fun in that? With the infrastructure that’s out there, we can talk all around the world!

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I picked one of these little guys up in Dayton this year. It’s a small, single band (70cm) MMDVM (Multi-Mode Digital Voice Modem) board that you use in conjunction with a raspberry pi computer. It attaches right to the GPIO, you screw on an antenna to the SMA connector, and after setup of the software, you’re good to go! They’re powered simply via the Pi through the GPIO, so you have no additional power concerns. In the above photo I am powering it through a PowerFilm Solar phone charger. With this battery bank at a 50% charge or so when I plugged it in, I had around 7 hours of usage of the ZumSpot, only about 30 minutes of talk time, however the remainder was receive time. You can purchase it as a kit for $129.95 from HRO, that includes the hotspot, a raspberry pi zero, and a small SMA rubber duck antenna to attach to the board. I will warn you that this doesn’t come with a case, there is a case available for purchase, it’s a real pain to put together, but it works for sure, and I would highly recommend putting something on it so you don’t just have open circuit boards laying around.

It is the most all inclusive hotspot produced to date, it covers the big 3, as well as P25, and NXDN, with support for running cross modes if you can figure out how to set it up. I am no expert. By any means. It took me close to 12 hours of playing around with this to realize that when I changed my call, I never reconfigured by D-Star registration correctly. That was in December, it’s now May at this point – just goes to show how little I use the D-Plus reflectors. After I finally get all of this configured it works perfectly. I have been using it on and off, bringing it with me tethered to a cell phone for internet service, linked to the DCS006B reflector.

I’m not going to go through the details of setup here, I may make another post about that, however it’s straight forward. If you have any interest in these modes, this is one of the cheapest ways to get into it. If you feel like putting together a repeater to play with the mode, go for it, but if you just want something small, cheap, not needing tons of equipment that’s going to require a second mortgage to get running, you can get one of these boards, and the entry level radio for one of the modes – I’d suggest the Icom ID-31 for D-Star, the Yaesu FT-70 for Fusion, and the TYT MD-380 for DMR (only because of the users groups and assistance that can be given), and still get out for under $400 – especially if you catch the radio’s when there is a manufacturer rebate.

Definitely something I would recommend to anybody that is looking to play with digital voice modes locally as it is such a simple way to get in to it.