Welcome to the 403rd installment of Linux in the Ham Shack. In this episode, the hosts bring in guest Tom early, N7TAE. Tom is the creator and lead developer in the MVoice and MRefd projects. MVoice is the original M17 client software and MRefD is a spinoff of XLXD which creates software reflectors for the M17 voice protocol. We take an in-depth look at how each piece of software was developed and written. Then from a user perspective we detail downloading, building, configuring and running each project. Thanks for listening and have a great week.

73 de The LHS Crew

In this episode, Martin (M1MRB) is joined by Leslie Butterfield G0CIB, Dan Romanchik, KB6NU, Matthew Nassau M0NJX and Edmund Spicer M0MNG to discuss the latest Amateur / Ham Radio news. Colin (M6BOY) rounds up the news in brief and in this episode we have a double feature RSGB Quarter 1 Update and Scouting Radio.

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We would like to thank Michael Bridak (K6GTE), Christopher Naylor (VK3TLA) and our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit - http://www.icqpodcast.com/donate

- Ofcom Released Age of Radio Amateurs Data - Modified French Amateur Radio Callsign for Great Britain Nationals - Cooperative Effort to Resolve Potential 70-Centimetre Interference Issue - New RSGB EMF Calculator Available - 4M IRTS News in the East Leinster region - Resuming UK Examinations in Clubs - Ham Radio Friedrichshafen Physical Event Cancelled

Ham College episode 75 is now available for download.

Extra Class Exam Questions – Part 13.
E3B Transequatorial propagation, long-path, grayline, ordinary and extraordinary waves, chordal hop, and sporadic E mechanisms.
55:06

Download
YouTube

 

YZS-362kHz Coral Harbour, NU    (www.ve3gop.com)

Propagation on MF has been both hot and cold for the past few weeks, seemingly depending on where you live and the amount of geomagnetic activity affecting your region.

A 'challenge target' for listeners in North America is YZS - 362kHz in Coral Harbour, NU, on Southampton Island  at the north end of Hudson Bay. It's widely heard throughout North America and Europe and is a good target for listeners everywhere. Listen for YZS's upper sideband on 362.405 kHz.

When tuning for NDBs, put your receiver in the CW mode and listen for the NDB's CW identifier, repeated every few seconds. Listen for U.S. NDB identifiers approximately 1 kHz higher or lower than the published transmitted frequency since these beacons are modulated with a 1020 Hz tone approximately.

For example, 'AA' near Fargo, ND, transmits on 365 kHz and its upper sideband CW identifier is tuned at 366.025 kHz while its lower sideband CW ident can be tuned at 363.946 kHz. Its USB tone is actually 1025 Hz while its LSB tone is 1054 Hz.

Often, one sideband will be much stronger than the other so if you don't hear the first one, try listening on the other sideband.

Canadian NDBs normally have an USB tone only, usually very close to 400 Hz. They also have a long dash (keydown) following the CW identifier.

All NDBs heard in North America will be listed in the RNA database (updated daily) while those heard in Europe may be found in the REU database. Beacons heard outside of these regions will be found in the RWW database. These databases have recently been re-vamped and are slicker than ever before!

From CLE coordinator Brian Keyte (G3SIA), comes the following CLE info:

Hello all

Our 266th Co-ordinated Listening Event is almost here.
Can new 'listening eventers' join in too?  YES, PLEASE! 
Joachim and I are always pleased to help first-time CLE logs
through the harvester program.

     Days:    Friday 26 March - Monday 29 March
     Times:   Start and End at midday, your LOCAL time
     Range:   350.0 - 369.9 kHz

Please log all the NDBs you can identify that are listed in this range (it includes 350 kHz but not 370) plus any UNIDs that you come across there.
You can find full information to help you, including seeklists made from
REU/RNA/RWW, by going to the CLE page http://www.ndblist.info/cle.htm and clicking on  CLE SEEKLIST  there.

Please send your 'Final' CLE log to the List, if possible as a plain text
email and not in an attachment and - important - with 'CLE266' and 'FINAL'
in its title.
Please show the following main items FIRST on EVERY line of your log:

  #   The full Date (e.g. 2021-03-26) or just the day (e.g. 26)
         and UTC (the day changes at 00:00 UTC).
        Many of us will be changing our house clocks during
        the weekend, but UTC CONTINUES UNCHANGED.
  #   kHz - the beacon's nominal published frequency, if you know it.
  #   The Call Ident.

Optional details such as Location and Distance go LATER in the same line.
Please always include details of your own location and brief details of the
receiver, aerial(s) and any other equipment you were using.

Joachim or I will send the usual 'Any More Logs?' email at about 19:00 UTC
on Tuesday so you can check that your log has been found OK.
 

Make sure that your log has arrived at the very latest by 08:00 UTC on
Wednesday 31 March.   We hope to make all the combined results within a day
or so.

Good listening
   Brian
-------------------------------------------------------------------
From:      Brian Keyte G3SIA        ndbcle'at'gmail.com
Location:  Surrey,  SE England       (CLE coordinator)
-------------------------------------------------------------------
 

If you are interested in some remote listening - maybe due to local difficulties - you could use any one remote receiver for your loggings, stating its location and with the owner's permission if required.( e.g. see  kiwisdr.com ) A remote listener may NOT also use another receiver, local or remote, to make more loggings for the same CLE.

These listening events serve several purposes. They

On Twitter, someone recently commented that it would be nice to have more 2m SSB activity for Summits On The Air (SOTA). It is well known that FM is a more commonly used mode but that its performance suffers for weak signals. This got me wondering about which bands and modes are being used for SOTA above 50 MHz.

Above and Below 50 MHz

First off, I wondered what portion of SOTA radio contacts are on VHF/UHF. Looking at the SOTA database Facts and Figures page, I simply grouped the number of QSOs as “Above 50 MHz” and “Below 50 MHz.”

So we can see that about 1/5th of the SOTA QSOs are done using VHF and higher frequencies. Certainly, we’d expect that the HF bands would dominate the total but this VHF+ percentage is higher than I expected.

Breaking Down > 50MHz

That leads to the question of what bands are used above 50 MHz? The table below shows the >50 MHz data broken out by band. The % of Total column indicates the percent of all QSOs (Above and Below 50 MHz), while the % of >50 MHz column shows the percentage relative to only >50 MHz radio contacts. Simply put, the % of Total column will sum to 21%, matching the number in the first table. The % of >50 MHz column sums to 100%.

Well, it doesn’t take a degree in statistics to see that the 144 MHz band (2 meters) is the most popular VHF/UHF band for SOTA. Almost 90% of the QSOs are on this band. The next most used band is 433 MHz (70 cm) at a little over 9%. The 6m band (50 MHz) comes in at third with about 3.5%. The other bands are so small, they don’t really add much to the total.

The data on the SOTA page does not break out mode used by band but it does provide some aggregate mode numbers. The number of FM contacts (using any band) is 1186542. It is reasonable to assume that almost all of these FM QSOs were made above 50 MHz. (FM is used a bit on the 10m band but that combination is rare in SOTA.) That means, for frequencies >50 MHz, 88% of the QSOs (186542/1346206) were completed using FM.  We don’t know how the remaining 12% splits out but I would expect them to be a mix of SSB and CW, but dominated by SSB.

Given the high number of 144 MHz contacts in the mix, it is safe to say that 2m FM is the dominant mode for VHF/UHF SOTA. After all, it is The Utility Mode. The reasons are obvious…almost every radio ham has a handheld transceiver that can do 2m FM. It makes for an easy way to get on the air and active a summit. More importantly, it is an easy way to chase a summit. When I plan a SOTA activation, I think about the kinds of operators that will be within range and what kind of gear they are likely to have. It does me no good to drag along equipment for 2m SSB/CW if there is no one around to work that band/mode.

This analysis does confirm that the number of non-FM QSOs on VHF/UHF is relatively small. The 12% of non-FM QSOs above 50 MHz corresponds to only 2.5% of all SOTA QSOs. So why is this? Clearly, the affordability and popularity of the FM handheld transceiver is a big factor.  There are portable radios that can do “all modes” on VHF/UHF such as the Elecraft KX3 (2m option), Yaesu FT-818, and the Icom IC-705, but these are much more expensive.

What About 70cm and 6m?

Now, it is interesting that the 70cm numbers are small compared to 2m. Many of those handheld transceivers that get used for 2m also have 70cm included, so you might expect there to be more 70cm QSOs in the mix. For a given boom length, a 70 cm Yagi antenna will have more gain than a 2m Yagi. So gain is easier to come by on the higher band.

Note that the SOTA rules do not encourage working the same station on more than one band. You only get credit for working a station once on an activation. (Compare this to VHF contest scoring which usually adds in additional credit for working stations on multiple bands.) So if a chaser works someone on 2m, they typically don’t bother working them on other bands.  I am not saying this is bad, I am just trying to explain why we don’t see more QSOs on 70cm.

The other band you might expect to see more activity is 50 MHz (6 meters). This band is available to Technicians in the US and, when the band opens up, you can easily work a thousand miles or more via Sporadic-e propagation. (Sometimes F-layer propagation, too, but we’ll need a whole bunch more solar activity for that to happen.) Many HF rigs include 6m as a “bonus band”, even some of the QRP radios popular with the SOTA crowd (KX3, IC-705, etc.) So why are the 6m numbers so low? This band offers a metric ton of fun, but it dishes it out randomly. There is a reason they call it the Magic Band…sometimes the Magic is there and sometimes it is dead quiet. When it’s dead quiet, it is a poor imitation of the 2m band. It also requires larger antennas, so if an activator decides to use antenna gain to help their signal, a portable Yagi for 2 meters is going to be a lot handier than one for 6 meters.

CW and SSB

This data does show that CW and SSB are lightly used for SOTA on the VHF/UHF bands. This is an opportunity. If more of us used these modes, it would improve our ability to squeeze out contacts when the signals are weak.

Bob K0NR

The post Looking at VHF/UHF SOTA Data appeared first on The KØNR Radio Site.

Hello and welcome to the 402nd installment of Linux in the Ham Shack. In this episode, the hosts start by wrapping up the most recent QSO Today Virtual Ham Expo. Afterwards, discussion topics range from in-person ham radio events that are (currently) still happening to Garuda Linux, Audacity, Kooha, Raspberry Pi pico SDRs and much more. Thank you for listening we hope you have a fantastic week.

73 de The LHS Crew

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