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This is certainly not the first blog posting to be written about the D-STAR Access Point Dongle (DVAP).  If you Google the subject you’ll find many.  I would like to thank Tim Kirby, G4VXE for his excellent blog postings regarding the subject of the DVAP and his time in helping answer a few questions I had regarding the product. 

Let me start off by answering the question of why, why did I purchase the DVAP?  Yes, I am extremely fortunate to live in a part of the county which has several excellent D-STAR repeaters.  As a matter of fact, we have repeaters both here in Denver (W0CDS) and one down in Monument, Colorado (W0TLM) serving the greater Colorado Springs area.  From just about any point in Denver, including my home shack (via external antenna) I can connect to the Denver machines and generally anywhere south of Denver can hit the Monument system.  So again, why do I need the DVAP device?

This is partly answered by saying my biggest interest in D-STAR is not for local rag chew.  I much prefer to either just listen in on an active reflector or conduct short QSO’s or even rag chews with a hams around the world.  It has been my experience that our local D-STAR repeaters are often used for local rag chew sessions.  Again, sometimes I just enjoy listening in on an active reflector and hear hams from the other side of the world talk about whatever they are talking about.  The DVAP allows me to essentially connect to any D-STAR reflector I choose and I can listen without interruption or without tying up the local repeaters for just my listening enjoyment.  Of course, I can also contribute to the conversations as well and I do enjoy that aspect about D-STAR over Echolink or IRLP.

You might be wondering exactly what the DVAP is and how it works?  Another great question.  You may have heard of the DV Dongle which came out a few years ago.  It was a little blue box which connected to your PC and allowed up to use a PC headset and microphone to access the D-STAR network. The DVAP is almost the same thing.  Notice I said almost.  It does connect to a PC or Mac, but you must also own a D-STAR capable transceiver.  I have the ICOM IC-92AD. 

In my case, the IC-92AD controls all aspects of the DV Access Point Dongle and functions much the same way as my local D-STAR repeater.  The DVAP is essentially my own personal D-STAR repeater/gateway system.  I can setup my memories in the IC-92AD to connect to, communicate with and disconnect from all the reflectors on the D-STAR global system.   The DVAP has a built-in antenna and is capable of transmitting at 10mw on the 2m amateur band.  The range of the DVAP is designed to cover a range of up to 100 yards.  Depending on a few variables your results may vary.  In my application I plan for now to just operate it indoors with the stock antenna.  Of course, I’ll test with my outside mounted 2m antenna at some point to see just how far I can walk away from my QTH and still be able to use the DVAP.  But the general application is mainly inside my home and perhaps on the back deck or courtyard.

As you can tell from the photo above, the DV Access Point Dongle is relatively small.  Inside the box you you’ll find the DVAP module with antenna attached, a user guide and a USB cable.  The user guide explains briefly about the operation of the DVAP and points you to the DVAP Support Website.  From the DVAP website you’ll find additional “how to” material and links to the various software you’ll need to download and install. 

Because I had done some homework on my own before hand, and again thanks to Tim for answering a few questions, I was setup and fully functional in about 10 minutes.  During this 10 minutes I downloaded the software and drivers, unpacked the DVAP from the box, connected it to a laptop running Windows 7 and programmed a few memories to connect to the UK reflector.  I’ve been playing around with the DVAP and getting my memories setup on the IC-92AD for about an hour and am really pleased with the DVAP.  As I stated, I’ll do some more testing and will make sure to blog about my experiences.  Currently I’m using the DVAP tool which is what you’ll find on the DVAP support website.  I do have plans to test another client which offers a little more functionality and allows you to connect direct to reflectors from the software client versus the need to setup from the radio.  But I wanted to first checkout this client first.

As I stated earlier, I do have a few tests I want to complete.  First, I’ll connect the DVAP to my external 2m antenna which is mounted just below my roof line.  It might be interesting to know just how far I can walk away from my QTH and still be in communication to the DVAP.  Remember the DVAP transmits at 10mw.

I also want to check out the other software client which I briefly discussed.  I also plan to setup additional memories on the IC-92AD for other D-STAR reflectors.  I’d like to see how it all works from my office location.  I do work in a lab which is somewhat of an RF black hole.  It might be nice to take the setup to work and enjoy some D-STAR QSO’s during my lunch break.  Finally, I plan to test the range of the DVAP by attaching my external 2m antenna and walking around the neighborhood.  This will probably just a be a one-time test to fulfill my curiosity of just how far 10mw will truly go.  I also have plans to test to see how well it would perform when connected to my 3G AT&T data card.  This could be useful on longer road trips where either I don’t take along HF gear or just to supplement my operation.  I’m sure I’ll share my experiences via this blog site.

But for now, it will come in handy in the shack.  Speaking of which, I just finished my first QSO on the DVAP while connected to the USA Reflector 001, module C with N9ZGE – Don in Springfield, IL.  I was his first D-STAR contact and he was my first DVAP contact.  Best of luck to Don as he continues making those D-STAR contacts.

If you would like to learn more about the exciting D-STAR digital mode, please read this.

Until next time…

73 de KD0BIK

Years ago, after I built my Elecraft K2 I had the idea that I would only use home-built radio equipment. However I found that it was no longer possible to buy a kit to build a 2m FM radio. This afternoon I visited a site mentioned by Tim, G4VXE in his latest blog posting and was intrigued to find that a Dutch group is working on a design for a VHF/UHF transceiver kit. Not only that, it is apparently being developed in consultation with Elecraft and is built into an Elecraft EC-1 (K2) enclosure!

The basic kit will be for an analogue FM transceiver with modules for 2m, 70cm and 23cm (it isn’t clear to me whether you must choose one of these bands or whether you can fit all of the modules.) But with the addition of another module it can also become a D-Star transceiver!

Now I have never made any secret of my dislike of D-Star, mainly due to the fact that one manufacturer has a monopoly on the provision of radios. But a home-brew D-Star transceiver that doesn’t require you to buy anything from Icom and would sit neatly alongside my K2 in a matching enclosure could just be the thing that makes me swallow my objections. Yes, it will still have an AMBE chip containing the proprietary codec. But most of my radios contain chips with proprietary firmware so I don’t think that’s a good enough reason for continuing to avoid D-Star.

Years ago, after I built my Elecraft K2 I had the idea that I would only use home-built radio equipment. However I found that it was no longer possible to buy a kit to build a 2m FM radio. This afternoon I visited a site mentioned by Tim, G4VXE in his latest blog posting and was intrigued to find that a Dutch group is working on a design for a VHF/UHF transceiver kit. Not only that, it is apparently being developed in consultation with Elecraft and is built into an Elecraft EC-1 (K2) enclosure!

The basic kit will be for an analogue FM transceiver with modules for 2m, 70cm and 23cm (it isn’t clear to me whether you must choose one of these bands or whether you can fit all of the modules.) But with the addition of another module it can also become a D-Star transceiver!

Now I have never made any secret of my dislike of D-Star, mainly due to the fact that one manufacturer has a monopoly on the provision of radios. But a home-brew D-Star transceiver that doesn’t require you to buy anything from Icom and would sit neatly alongside my K2 in a matching enclosure could just be the thing that makes me swallow my objections. Yes, it will still have an AMBE chip containing the proprietary codec. But most of my radios contain chips with proprietary firmware so I don’t think that’s a good enough reason for continuing to avoid D-Star.

One of the things at the back of my mind when I was writing that the magic of ham radio wasn’t in high technology was the feeling that anyone who got into the hobby out of a mania for high-tech toys was soon likely to be disappointed. I’ve seen it happen when people who are new to the hobby and don’t yet know much about it get an enthusiasm for APRS or Echolink. They get disappointed that the network coverage is patchy or nonexistent compared to cellphone coverage because they don’t realize that it depends on hams to provide the infrastructure and where there are few hams – or none interested in these particular aspects of the hobby – there are no repeaters and no gateways.

I’ve seen the same people criticize the latest VX-8, TH-D72 and Icom D-Star radios as being overpriced and unimpressive. They don’t like the geeky “walkie talkie” look or the plain 1990s LCD display. They can’t believe that APRS radios don’t support predictive text entry like the cheapest mobile has for more than a decade. And why can’t they have a colour screen and a scrolling map display?

It’s easy to dismiss these criticisms as coming from people who don’t understand that ham radio is a specialized niche market and that amateur HTs don’t benefit from the economies of scale which allow vastly more R&D to be spent on a smartphone costing a similar amount of money. But then I realized that perhaps the critics had a valid case. Manufacturers of smartphones don’t completely reinvent the wheel whenever they release a new model. They just design the hardware. But the hardware is a platform. On it runs a standard OS and various apps, a few of which may be customized to the manufacturer or phone but most of which are generic. Given that software development is one of the most time consuming and expensive parts of any new technology product development, wouldn’t that be a huge saving?

Why can’t top of the range hand-held radios use a similar hardware architecture to cellphones? Instead of a custom design the radio would be a computer running embedded Linux. The RF side could be SDR or it could use conventional technology – it wouldn’t matter, that would simply depend on what is most cost effective and delivers the best battery endurance. But all the control functions, together with transmit and receive audio, would be accessible through an API to software. The user interface would be an app.

Since the radio is a computer the interface would be endlessly customizable and all kinds of things not possible with existing radios could be feasible. Instead of entering local repeater frequencies into memories you could install an app that gets your position from the built-in GPS and shows you the nearest repeaters. One click and you’re listening on it.

Instead of a plain LCD display showing distance and bearing your APRS capable radio could show a full map display just like APRSISCE currently provides on Windows smartphones. You wouldn’t need packet modem hardware in the radio because packet generation and decoding could be done in software. In fact there would be no such thing as an APRS capable radio. The platform would be the same – if you wanted APRS you would just install the APRS application. If you wanted Echolink you could add the Echolink application. If you wanted D-Star you could buy the D-Star app from Icom. If you wanted to work satellites then I’m sure someone would write an app that would keep track of where the satellites are and even control the radio frequencies taking account of doppler.

You could power this hypothetical next generation radio using cellphone battery packs, which are a lot cheaper than the custom battery packs for traditional ham radios. You could even use standard cellphone accessories.

So why won’t this happen? I guess the reason for that is that Yaesu, Icom, Kenwood and the rest don’t make cellphones. Their business is making radios that are intended to be as dumb as most of their users. Ham radio is just an offshoot. The market just isn’t big enough to justify developing what for them would be a completely different and unique hardware platform. So I guess for the foreseeable future we’ll be stuck with our geeky walkie talkies and the cool stuff will all be on cellphones.

Several ham radio blogs have linked to the Wired article Why Ham Radio Endures in a World of Tweets. “What is it about a simple microphone, a transmitter-receiver and the seductive freedom of the open radio spectrum that’s turned a low-tech anachronism into an enduring and deeply engaging global hobby?” the author asks. He goes on to describe the thrill of establishing a direct, person to person long distance contact and exchanging QSL cards, which he contrasts with “a world of taken-for-granted torrents of e-mails, instant messages and Skype video-chats.” It’s a point of view that QRP enthusiasts and many others will identify with.

In the comments to the article many have been keen to say that ham radio is not low tech, citing “VoIP Radio” and digital techniques as examples. They may be true, but I’m afraid the commenters miss the point. The more high-tech ham radio becomes, the less magic there is. Developments like D-Star are about as far from the concept of a simple transceiver and the freedom of the open radio spectrum as it is possible to get. It isn’t simple, it isn’t free (since it depends on a network controlled by someone else) and it isn’t open. Which is why it is anathema to many of us.

There is a danger that the pursuit of technology could turn ham radio into a poor copy of existing communications networks. Ham radio has endured because it has held on to its traditions involving relatively simple technology that most hams can understand and even build for themselves. If we ever lose sight of that the hobby is as good as dead.

Introduction:

• Intro from Pete, VE2XPL, host of the wAVEgUIDES pODcAST.
• Promo for the GNU World Order podcast.

Announcements:

• Hello to the new folks in the chat room.
• The Mintcast podcast is either going to stop or will have new hosts after the next episode. If you’re interested in hosting a podcast, contact the folks over there.
• Please spread the word about MAGNetcon, the Mid-America GNU/Linux Networkers Conference, to be held May 6-7, 2011 at the St. Louis Union Station Marriott. If you know anyone that might be a sponsor, exhibitor, or speaker, please let us know. Application forms are available on the web site.
• Check out the new website for Resonant Frequency.
• Also mentioned, the Going Linux podcast and Computer America, “America’s longest-running nationally syndicated radio talk show about computers.”

Feedback:

• Richard, KR4EY, writes about CW… wait, we did this one in Episode 52.
• John, KC8DAX, weighs in on the Windows vs. Linux debate: there are hams that will buy a wire antenna and there are others that will build one. He thinks it’s the same thing with operating systems. Would you want a radio you couldn’t open? Our hosts discuss.
• We received a donation from Charles to help send Linux in the Ham Shack to the 2011 Dayton Hamvention. Thank you, Charles!
• Joe, K1RBY, recently discovered the podcast and is catching up, but is having a problem using gpodder to retrieve episodes. Yes, Joe, there is a bug in one of the WordPress plugins on the web site that contributed to the problem (see lhspodcast.info for a description of the problem.) It has been corrected.
• John, K7JM, also had the problem with gpodder and sends his appreciation for the fix.
• Richard, KJ4VGV, tells us that he is a new amateur radio operator since May and has published an article: Antenna Restrictions: Are They a Catastrophe Waiting to Happen? Good job, Richard!
• James, N2ENN, comments about our episode 52 when we discussed Unity, and offers his thoughts on Wayland, Debian and Ubuntu. Our hosts discuss, and digress to a discussion of browsers, plugins, drivers, ALSA and PulseAudio on Debian vs. LinuxMint Debian Edition. They also commment on Bill Meara’s (of SolderSmoke fame) efforts to get WSPR running under WINE in Ubuntu.
• Paul, KE5WMA, writes “PIC micro controllers are getting more popular in HAM projects. Any suggestions on programming software and boards?” Well, Paul, Linux does still support serial ports, but this may be a good topic for another show. You might find something useful in the many hits returned by a Google search on “Linux PIC programmer”.
• B.B., KC5PIY, asks for help with getting Windows programs for programming radios, such as the Icom IC-2820H and IC-706 MkIIg, running under Linux. He’d also like an APRS client. Richard recommends UIView as an APRS client for Windows, and Xastir for Linux. Russ suggests that most of the radio programming applications will run under WINE in Linux. Also, check out CHIRP, free Linux software for programming a variety of D-STAR radios. You may also want to explore the D-RATS mailing list. It’s not likely you’ll be able to dual-boot Windows and Linux on that netbook, but you can install Ubuntu Linux using WUBI, which would allow you to run Linux within Windows, or install Linux to a USB flash drive using Pen Drive Linux.
• Craig, KB5UEJ, writes about learning IPv6: “I went through the Hurricane Electric certification program and really learned lots about IPv6. I’m now running IPv6 on my home using HEs IPv6 tunnelbroker service. It’s no longer the big bad scary thing that it used to be.” Russ also talked about IPv6 on episode 6 of his QSK podcast.
• Matt shares his thoughts about building “simple” projects from junk box parts and the similarity to running Linux.

Contact Info:

• Contact Richard at [email protected], Russ at [email protected], or both at the same time at [email protected].
• Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
• Leave us a voice mail at 417-200-4811, or record an introduction to the podcast.
• Sign up for the LHS mailing list.
• Sign up for the MAGNetcon mailing list.
• LHS merchandise is available at the SHOP! link on Web site. Check out the Badgerwear or buy one of the other LHS-branded items at PrintFection.com/lhs or Cafe Press. Thanks!
• Thanks to Dave from Gamma Leonis for the theme music.

Music:

• “Balboa” by Ness from the album Fiesta, courtesy of Jamendo.
• “Crawling Back In” by Deathalizer from the album It Dwells Within, courtesy of Jamendo.

One of the reasons why I have not been an enthusiast of the D-Star system is that it creates a separate class of activity incompatible with existing voice modes just for the dubious benefit (from an amateur point of view) of using digital voice instead of analogue. Using EchoLink, IRLP and APRS we already have a global network that allows one ham to contact another anywhere in the world using ham radio, one that does not require anyone to purchase expensive new equipment from Icom or anyone else. What we have not done is put it together in a way that makes it work seamlessly as a coherent network.

Automatic Voice Relay System (AVRS) is an idea by Bob Bruninga, WB4APR, the inventor of APRS, first published in 2000, to create a system that allows users of EchoLink, IRLP and even D-Star to inter-communicate. APRS provides the location and identification information for the analogue FM EchoLink and IRLP users, something that is already built in to the D-Star system. As is often the case, those who have the great ideas don’t always have the skills needed to bring them to fruition, so AVRS remained little more than an idea for ten years.

Now, apparently, a developer has been found who is able and willing to write the software that will enable AVRS version 2 to come into being. You can read more about AVRS here. For seamless one-button operation you will need one of the new generation of APRS-capable radios (Kenwood TM-D710, TH-D72 or Yaesu FTM-350) that are able to QSY to a frequency contained in an APRS packet. Some will argue that if you are going to buy one of those, why not buy a D-Star radio instead? But AVRS capability, being based on APRS, can easily and inexpensively be added to any analogue FM radio. AVRS will not leave analogue FM users out in the cold because their local repeater converted to D-Star, as has happened in some parts of Britain.

One of the interesting aspects of AVRS version 2 is the development of A-Star repeaters. These are analogue FM repeaters with a D-Star gateway that use the D-Star network to link them together. Callsign and location (if known) information is transmitted as a 0.3sec APRS packet burst at the end of each over. A-Star users will appear to D-Star users just like other D-Star users and can easily intercommunicate. A-Star users can initiate a contact with another A-Star or D-Star user just by sending an APRS message starting with A*. A-Star users don’t even need to be monitoring a repeater in order to be contactable: they will receive the message as an ordinary APRS message and can QSY to the repeater (with one button press if using one of the radios mentioned above) using the information contained in it.

AVRS looks like a great idea with the potential to bring digital and analogue voice users together. It might even erode some of the analogue vs D-Star conflict.