Sunday, June 13, 2021

HR3:2021 Quick Engagement Results

Yesterday was the first annual Hudson River Radio Relay event. This year our fundraising theme was to support Bannerman's Castle Trust via GoFundMe and we managed to raise $1,418 in total with over $300 of that coming in the hours leading up to, during and just after the four hour event which took place from 1:00 PM to 5:00 PM Eastern US time on June 12th

While we await the final logs from all eight of our participating special event stations to get compiled and posted to the website, an initial estimate from casual discussion with most all the participating locations sounds like we should end up around 500 to 600 total contacts as a collective group.

There are so many positive things that will get mentioned about this event that will get published in the coming days along with lots of pictures and videos, but here is a quick snap shot just based on who visited each special event web page as well as the page for each of our eight callsigns.   

Both metrics were measured from between May 13th and June 13th at 10:00 AM EST.

It was expected the N2B station would possibly gain the most attention as a never before activated USIAP island NY047, but the N2O station rivaled our flagship location mainly due to its various USIAP, COTA, POTA and SOTA designations along with an amazing number of enthusiastic members that promoted what they were doing.

Our three stations that were not aided by affiliation of the different "on the air" categories like islands, parks or summits such as N2H, N2S and N2V seem to have also been very popular too over the last 30 days of measurements and deserve a lot of credit also.

The three lowest elevation stations, some only a few feet above the river such as N2U, N2D and N2N are hidden gems that deserve much more attention considering how hard they worked and are all actually very rare locations that we need to help promote even more for next year. 

Between these three stations, there was a brand new USIAP NY-073 on a US Army facility plus POTA K-2079, K-4582, K-5161, COTA K-00825 and the former home of the founder of Paramount Pictures.

What's Next?

Now that we have an official website visit metric posted just after the event, please go and learn more about each club and location they operated at during this special event by visiting 

More detailed articles from each station highlighting each sponsoring club and a list of total event contacts plus the winner of our Xiegu G90 package raffle will be coming soon, so please follow the HVDN blog for more details between now and ARRL Field Day which is just under two weeks away.

Tuesday, June 1, 2021

May 2021 Global Digital Repeater Roundup

Our May 2021 summary of the HVDN Global Digital Repeater Roundup marks our 9th edition in this series which tracks the evolution of digital voice mode popularity within the amateur radio community.

Starting back in October 2016, a fellow local club in the Hudson Valley was firm in not wanting to invest in a digital mode repeater until they knew based on fact, which was going to be the most popular mode to promote to its membership and find ways to fund. This is what spawned HVDN.

Hudson Valley Digital Network compiles data on repeaters based on freely available information found on the website.  While repeater deployments only tell a fraction of the story relating to the overall use of digital voice, they also are a great way to measure the health of amateur radio communities in certain locations around the world.

Repeaters are expensive to build, manage and operate  

The Overlook Mountain Amateur Radio Club in New York operates two analog FM VHF repeaters, with one of those being considered a wide area repeater. 

This sole wide area repeater has proven to be a major resource in creating a social and positive atmosphere which attracts new membership to this club and offers an alternative for those not happy with overall "repeater culture" found in other area organizations. 

This repeater is also credited with providing a valuable mental health benefit during the early and dark days of the COVID situation. 

Without examples like the OMARC 146.805 MHz repeater, many other clubs around the world would find it hard to show value to its membership unless they are involved in other public awareness aspects beyond repeaters of any type.

Adding digital repeaters to the right club, enhances its  membership reach and community value but adding a digital repeater to the wrong club does nothing other than to deplete the club treasury.  

Careful decisions need to be made when considering how a repeater will be funded, managed and operated.

Not a New York or a Hudson Valley thing, but a global thing!

If clubs fail to innovate or provide services to its membership, they fail to grow.  When a club fails to grow,  its area competitors stand to take advantage in attracting new members or create reasons for  alternative organizations that can help educate or attract new amateur radio enthusiasts. 

Repeaters are often the lifeblood of many amateur radio clubs and need to be carefully considered. 

The above chart and table shows that DMR is by far the most popular digital mode with a staggering 148.42% growth over the last 5+ years globally.

The next closest contender is Yaesu's single vendor ecosystem Fusion System at a still impressive 106.91%.  

The oldest digital voice mode offered by the limited dual vendor ecosystem behind Icom D-Star comes it at a slow and steady 20.72%, even though it had a huge head start over its competitors for more than 10 years prior to 2016.

Since our last update in October 2020, DMR repeaters globally grew 7.97% compared to Fusion's 7.32% increase.  In contrast, Icom's D-Star only added 1.43% growth in the same time period.

With these three amateur designed and amateur only digital voice systems representing at least 9,146 global digital voice repeaters, its clear that the total number of next generation repeater systems is catching up fast to the approximate 17,000 total of analog repeaters world wide which has had about a total of 40 years to get to that point.

Should you still invest in DMR?

Every digital radio today supports legacy analog FM mode along with its newer digital friend be it DMR, as found in the popular Anytone D878 series of radio or any of the Yaesu, Icom or Kenwood counterparts capable of Fusion or D-Star.

Commercial standards like P25 are technically fastest growing mode at 157.27% over the last 5 years whereas NXDN is growing at 91.46%, but both lack consumer grade equipment and prices to really capture the hearts, minds and wallets of many amateur enthusiasts.

Since October 2020,  P25 global repeaters increased another 6.82%. NXDN grew at 13.76% but this is still mostly only happening in parts of the south eastern United States and is not considered true global growth.

All five of these modes do require licensing of the underlying technology to bring a new radio to market which impacts pricing and vendor ecosystem support.

There is a totally new open standard based on FDMA technology called M17 being developed by the amateur radio community which has a goal to circumvent some of these issues.

While most repeaters capable of supporting 9600bd data rate communications with 2.5PPM or better stability can be converted to work on any digital mode,  hand held or mobile radio equipment is not as ready to modify. 

Not having  ready made M17 capable radios are needed and not yet available. M17 wont be impacting new buying decisions of the amateur community in the near future.

Exit M17: Is the future here?

The M17 project which is supported by HVDN  as well as by a massive investment by Open Research Institute and a grant from Amateur Radio Digital Communications is unique since its developer community has found ways to modify DMR radio equipment such as the popular TYT MD-380 to transmit and receive M17 signals. 

The OpenTRX alternate firmware along with some hardware modifications are needed but is not a fully mature approach yet.

This is interesting since TDMA based DMR is very different than M17's FDMA architecture. More details on this can be found on the M17 Integrations summary page.

It is not likely that any of the Yaesu Fusion, Icom or Kenwood D-Star equipment will permit this type of modification, so purchasing any one of the many DMR products available today not only gives you the most popular digital voice mode along with legacy analog access, but could in the future be useful for M17 as it gains prominence.

To date, there are believed to be two M17 capable repeaters in development, but there is already a digital backbone being developed to support the future of digital repeaters and the many more hot spots that will likely result. 


So summarize all the above is easy:

  • DMR is still the most popular digital mode
  • DMR is not likely to be passed by anything in the near future
  • There are more DMR capable radios to choose from and not as impacted by supply chain issues like Yaesu or Icom.
  • If you travel, DMR is likely where to find more activity excluding the use of a hotspot.
  • The latest Anytone D878 which has AX.25 packet (APRS) is by far the best $299 USD utility radio to invest in for now and the near future.
  • Upgrading from an older TYT MD-380 or Radioddity GD77 to an Anytone or Alinco may give a good reason to modify your old radio to be used on M17 in the near future.
  • Supporting the future of the hobby via the M17 project will ensure relevance for the future to show alternatives to HF or analog VHF for terrestrial communications.

Friday, May 21, 2021

SNR: Getting the most from your antenna

Hello Amateur Radio Enthusiast!!

Ensuring that the signals you receive are intelligible, means that you want to have more signal than noise or a ratio of the two which is beneficial to your goals.

The easiest way to balance your signal to noise ratio or SNR, is to use the appropriate antenna to receive the signal you want. 

Changing polarity from vertical to horizontal is one way to influence your SNR. Another way to change your SNR is by using an antenna that focuses on the magnetic portion of a signal compared to that of the electrical portion. More about magnetic versus electrical fields can be viewed here.

Here is a great example thanks to Hudson Valley resident, Sebastian KI2D. He is using a Xiegu G90 HF radio with its waterfall function to visualize the signals and he toggles between these two antennae while you listen.  Antennae evaluated are:

  • 160m Sky Loop, 560' of wire, Palomar Engineers 4:1 balun
  • Chameleon EMCOMM III 130' end-fed half-wave antenna

In the video, the lower noise floor is done with the 160m wire loop which offers both a change in polarity as well as some magnetic properties. This antenna works on other bands beyond 160m also, but with different radiation patterns. Resonant loop antennae can be designed for any frequency however.

The end fed half wave antenna is more suitable for the electrical portion of the signals being received and even though it is also horizontal, have a much higher noise floor compared to the loop.  The end fed or EFW is popular and supports multiple operating bands also, but takes up much less room.

The results of the comparison are impressive

If you would like to enter in for a chance to support Bannerman's Island as part of Hudson River Radio Relay on June 12th, we are not only offering a complete chart of the electromagnetic spectrum, but also chances to be entered in for a drawing to win your very own G90 radio, just like the one featured in Sebastian's video. 

The poster can be viewed mounted in a frame in the recent USMA balloon presentation  by Nolan N2WU during HVDN:LIVE from May 17th 2021

It is likely that the N2S station this year at College Hill Park in Poughkeepsie thanks both to the Mount Beacon Amateur Radio Club and QSY Society will be using a variety of antennae to ensure they can hear and be heard during this four hour event.  Sebastian KI2D will be one of many operators as part of N2S that day. 

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