AmateurRadio.com

Special Event Week: Dec 24-Dec 31, 2023

The 1st annual Olivia Digital Mode on HF Winter QSO Party, celebrating 20 years of Olivia.

The Olivia Digital DXers Club (we’re on ClubLog!) is holding the first annual Winter Olivia Digital Mode on HF QSO Party, starting at 00:00 UTC, 24 December 2023, and ending at 23:59 UTC, 31 December, 2023.

Minimum logging requirements:  Callsign worked, Band (or Frequency), Mode (I.e., Olivia 8/250, or other variations), Time QSO Started.  You can log more than that, but for the sake of the certificate, please send at least the minimum information per QSO, to NW7US (email is on QRZ profile).  Logs can be any common method, from an .ADI file, to a screen shot.

Full details are on our website:
https://OliviaDigitalMode.org

Olivia, a Multi-Frequency Shift Keying (MFSK) radioteletype digital mode, is an amateur radioteletype protocol designed to work in difficult (low signal-to-noise ratio plus multipath) propagation conditions on shortwave radio (i.e., high-frequency, or HF) bands. The typical Olivia signal is decoded when the amplitude of the noise is over ten times that of the digital signal!

Here is an introduction to the Olivia digital mode:

73 de NW7US

It might not take as much antenna as you may think would be necessary to make two-way contacts on shortwave radio (as an amateur radio operator putting an HF transceiver on the air). However, often, makeshift antennae are effective enough to be viable–just look at all the contacts many amateur radio operators make with their low-power (QRP) rigs (transceivers) using short, helically-wound, mobile antenna sticks. If they can work magic with such inefficient antenna setups, surely your effort at an antenna would pay off to some degree. Right?

[embedyt] https://www.youtube.com/watch?v=-k5Su–ez2Y[/embedyt]

Of course, I want to make a proper dipole out of this example antenna. But, while I wait for the rest of the parts I need to complete this antenna project (pulleys and a ladder, and maybe a potato launcher), I’ve put this makeshift antenna on the air, with it just high enough so that I can enjoy some time on the shortwave bands.

With this antenna, I’ve made successful two-way voice and Morse code contacts (QSOs) with stations in Europe and across North America. I am able to tune it on the 60-, 40-, 30-, 20-, 15-, 17-, 12-, and 10-Meter bands. Reverse beacon detection picks up my Morse-code CW signals, especially on 40 meters (the band on which it is tuned physically).

The bottom line: just get something up in the air and start communicating. Improve things over time. You’ll have much fun that way.

73 de NW7US dit dit

Sure! You don’t need to have a software-defined radio (SDR) before you start learning how to use the technology; there are a few different paths you can take, exploring and learning about SDR.

One way to gain some experience with SDR without spending a dime is to install a free software package for the very popular, non-Linux, operating system (that starts with ‘W’), and give SDR a test drive. If you like it, you might consider getting your own hardware (like the SDRplay RSPdx, for instance), and connecting it up to your computer and running this software, too.

Why I Dived Into SDR

I have always loved radio, ever since the early 1970s, when I discovered shortwave radio. In the last couple of years, I’ve had an increasing interest in the world of SDR. When I am working, but away from home (remember those days, before Covid?), I want to sample news and programming from around the world, but through shortwave. The way to do that, I found, is by using the various SDR options which allow a person to tune a remote receiver, and listen.

I also find working with the waterfall of a typical SDR-software user interface rewarding because, instead of blindly searching for signals in a subband, I can see all of the received signals on the scrolling time representation of a slice of frequency. Simply select that signal on the waterfall, and the radio tunes right to it.

I often connect to different SDR radios around the world, to catch all manner of shortwave signals, from maritime, military air, trans-oceanic air, or coast guard radio traffic, or other interesting HF communications including amateur radio CW and SSB signals. Occasionally, I also check out VHF and UHF signals from around the world. All of that, while instead an office building that is not suited for shortwave radio reception.

I’ve now decided to give back to the community; I’ve added my SDR receiver to the collection of receivers located around the world on the SDRSpace network of SDR radios.

My new SDRplay RSPdx software-defined radio receiver is live, via http://www.sdrspace.com/Version-3, using the SDR Console software (Version 3).

The receivers are online whenever I am not transmitting and when there are no local thunderstorms.

Antenna Port A is connected to a wire antenna (a horizontal 100-foot wire that runs out from my house’s chimney to a tall tree; about 10 feet of that wire is oriented vertically, where the wire passes through a pulley and then is weighted down so it can move with wind-driven tree movement), while Antenna Port B is connected up to a VHF/UHF discone.

Both antenna systems have an AM Broadcast band notch (reject) filter reducing local AM Broadcast-Band radio station signals by about 30 to 40 dB. I need to use these because the very close KLIN transmitting tower is just miles away and those signals overwhelm the receiver. When I use the signal filters, the local AM Broadcasting signals no longer overwhelm the receiver.

In the following video, I first explain my SDR setup, and in the second half of the video, I tune around the radio spectrum, using the software to control my SDR receiver.

[embedyt]https://www.youtube.com/watch?v=DHj917E1bKA[/embedyt]

A Couple of Questions

After watching this video, WO9B wrote an email to me. Michael asked of me two questions, summed up as:

1. Your SDR window has the IF screen on top. How is that accomplished?

2. Your AM Broadcast filters; more info, please. I live in the area of mucho broadcast stations and that looks like something I could use.

In the following video, I demonstrate how I changed my layout of the SDR Console software. And, I mention the AM Broadcast Filter for SDR Receivers (the hardware filter is found here: https://g.nw7us.us/3kU5SJN).

[embedyt]https://www.youtube.com/watch?v=YLBLHi441Zg[/embedyt]

To Use My Receiver

Download the latest version of SDR-Console from https://www.sdr-radio.com/download – there is a 32-bit and a 64-bit Windows installation package.

The 64-bit installation package may be downloaded from one of these three sources:

1. Google: https://g.nw7us.us/3auBq44
2. DropBox: https://g.nw7us.us/310ooIG
3. Microsoft: https://1drv.ms/u/s!AovWaZDu7Hrd3U-yqK1bs3wuaFw2?e=o4nKeh

The 32-bit installation package can be downloaded from one of these three sources:

1. Google: https://g.nw7us.us/3iLasrZ
2. DropBox: https://g.nw7us.us/3g4VcVc
3. Microsoft: https://1drv.ms/u/s!AovWaZDu7Hrd3U4mJiiRtI9lm70s?e=HDG4ZX

Install the SDR Console package according to the directions given. Once you have the software installed, you will want to add my server. It takes some work to get familiar with the software, but there are online FAQs on how to begin.

One guide on how to add a server to the list from which you can pick may be found, here:

https://www.sdrplay.com/wp-content/uploads/2018/02/SDRConsoleV3-ServerGuide1-1.pdf

I worked on getting all of the bugs worked out of my installation before making the video. It did take some work, and reading up on things. But, the software is solid and a good contender against SDRuno, and HDSDR, and, this way I can share it online with you.

My server is known as, ‘0 NW7US‘ — it will be online when I am not using my antenna systems for transmitting. It will be offline during thunderstorms, or during times when I must use the systems for transmitting.

Software-defined radio is a great way to hear all sorts of communications, from local AM broadcast stations, FM stations, VHF Air Traffic, to shortwave radio stations including amateur radio HF communications.

Thank you for watching, commenting, and most of all, for subscribing; please subscribe to my YouTube Channel: https://YouTube.com/NW7US Also, please click on the bell, to enable alerts so that when I post a new video, you will be notified. By subscribing, you will be kept in the loop for new videos and more.

73 de NW7US

.. (yes, this is an expansion of an earlier post… forgive the redundancy… thank you) ..

My new SDRplay RSPdx software-defined radio receiver is live, via http://www.sdrspace.com/Version-3, using the SDR Console software (Version 3).

The receivers are online whenever I am not transmitting and when there are no local thunderstorms.

Antenna Port A is a wire antenna (100′), while Antenna Port B is a VHF/UHF discone. Both have an AM Broadcast band reject filter, reducing local AM Broadcast signals by about 30 to 40 dB. I need to use these because the very close KLIN transmitting tower is just miles away and those signals overwhelm the receiver. When I use the signal filters, the local AM Broadcasting signals no longer overwhelm the receiver.

Let me know what you think. Enjoy!

To use my receiver:

Install the latest version of SDR-Console which can be downloaded from https://www.sdr-radio.com/download

Install SDR Console according to the directions given. Once you have the software installed, you will want to add my server.

It takes a little to get familiar with the software, but there are online FAQs on how to begin.

My server is known as, ‘0 NW7US‘ — it will be online when I am not using my antenna systems for transmitting. It will be offline during thunderstorms, or during times when I must use the systems for transmitting.

Software-defined radio is a great way to hear all sorts of communications, from local AM broadcast stations, FM stations, VHF Air Traffic, to shortwave radio stations including amateur radio HF communications.

Thank you for watching, commenting, and most of all, for subscribing; please subscribe to my YouTube Channel: https://YouTube.com/NW7US Also, please click on the bell, to enable alerts so that when I post a new video, you will be notified. By subscribing, you will be kept in the loop for new videos and more.

Video:

[embedyt] https://www.youtube.com/watch?v=DHj917E1bKA[/embedyt]

73!

Are you participating in this year’s CQ World-Wide DX Contest, either the SSB weekend (this coming weekend, October 28-29, 2017), or the CW weekend (November 25-26, 2017)?  The CQ WW is the largest Amateur Radio competition in the world. Over 35,000 participants take to the airwaves on the last weekend of October (SSB) and November (CW) with the goal of making as many contacts with as many different DXCC entities and CQ Zones as possible.

Space Weather and Radio Propagation

I have updated my forecast on the expected propagation conditions during both the SSB and CW weekends of the 2017 CQ World-Wide DX Contest.  I will publish a new update for the CW weekend, when we get closer to that November weekend.

The link to the latest update is: http://cqnewsroom.blogspot.com/2017/10/cqww-dx-contest-propagation-update.html

Good luck!

73 de NW7US dit dit

Shortwave radio has been a source for great sci-fi plots, spy intrigue novels, movies, and so on, since radio first became a “thing.” But, what is the big deal, really? What is it that amateur radio operators listen to?

In this video, I share some of the types of signals one might hear on the high frequencies (also known as shortwave or HF bands). This is the first video in an on-going series introducing amateur radio to the interested hobbyist, prepper, and informed citizen.

I often am asked by preppers, makers, and other hobbyists, who’ve not yet been introduced to the world of amateur radio and shortwave radio: “Just what do you amateur radio operators hear, on the amateur radio shortwave bands?”

To begin answering that question, I’ve taken a few moments on video, to share from my perspective, a bit about this shortwave radio thing:

Link to video: https://youtu.be/pIVesUzNP2U — please share with your non-ham friends.

From my shortwave website:

Shortwave Radio Listening — listen to the World on a radio, wherever you might be. Shortwave Radio is similar to the local AM Broadcast Band on Mediumwave (MW) that you can hear on a regular “AM Radio” receiver, except that shortwave signals travel globally, depending on the time of day, time of year, and space weather conditions.

The International Shortwave Broadcasters transmit their signals in various bands of shortwave radio spectrum, found in the 2.3 MHz to 30.0 MHz range. You might think that you need expensive equipment to receive these international broadcasts, but you don’t! Unlike new Satellite services, Shortwave Radio (which has been around since the beginning of the radio era) can work anywhere with very affordable radio equipment. All that you need to hear these signals from around the World is a radio which can receive frequencies in the shortwave bands. Such radios can be very affordable. Of course, you get what you pay for; if you find that this hobby sparks your interest, you might consider more advanced radio equipment. But you would be surprised by how much you can hear with entry-level shortwave receivers. (You’ll see some of these radios on this page).

You do not need a special antenna, though the better the antenna used, the better you can hear weaker stations. You can use the telescopic antenna found on many of the portable shortwave radios now available. However, for reception of more exotic international broadcasts, you should attach a length of wire to your radio’s antenna or antenna jack.

Check out books on radio…

I’m on Twitter, Facebook, and YouTube.

I made contact with 19 Japanese stations yesterday afternoon (June 14, 2013) on the 50-MHz (6 meter) band between 2314 and 2356 UTC.  This was my first “JA opening” on 50-MHz in a LONG time; my last Japanese QSOs on 50-MHz were back in the ’90s when we lived in Tiffany, Colorado (grid square DM67), a bit south of our new home in Glade Park, Colorado (grid square DM59pa). During the years we lived in Vermont the furthest west I ever reached on 50-MHz was Guam, a bit short of Japan.

If I’m anywhere near my radio (and sometimes when I’m not – thank you, smartphone) I point a Web browser at the “ON4KST 50 MHz IARU Region 2″ chat page to read late breaking 50-MHz DX related news, spots, rumors and general chatter especially during during times of the year when 50 MHz propagation is known to be possible:

• Around the spring and autumn equinoxes for Trans-Equatorial Propagation (TEP)
• May through the first half of August for the northern hemisphere summer Sporadic-E (Es) season
• A few weeks either side of New Year’s Day for the northern hemisphere winter Es season sometimes with propagation links to the southern hemisphere
• And – if we had more sunspots than Cycle 24 has seen fit thus far to bequeath – the northern hemisphere autumn and winter for F2 propagation

(Of course 50-MHz can open at any time of day and year and much of what happens on “The Magic Band” is poorly understood.  But the periods above are the ‘prime time for six.’)

It all began yesterday afternoon at 2200 UTC (which was 4 pm Colorado time) when Han JE1BMJ, a noted 50-MHz enthusiast and propagation theorist, was reported on 50,090.5 kHz by Jay K0GU on the ‘KST chat which grabbed my attention.  Jay lives in Wellington, Colorado (grid square DN70mq) about 230 miles east of me and is a dedicated, experienced 50-MHz DXer.  Jay hears a lot of stations before any one else in the Rocky Mountain region and his ‘KST posts are always worth noting.  I turned my new 50-MHz antenna (thanks to K7JA for assistance in building and installing this last month and of course G0KSC for the design) towards Japan – 312 degrees azimuth – and started listening.  At 2226 UTC I started hearing Han’s CW (Morse Code) signal slowly fade and out.

Green Heron RT-20D controlling a Spid RAK rotator

When I first attempted to make contact with Han but he was unable to hear my complete callsign and was responding to me as “AA7X” (leaving off the final T, I am AA7XT).  I eventually stopped calling JE1BMJ – I didn’t want to ‘hog the DX’ as Han and other Japanese stations were being heard over much of the US.  For a two-way contact to be considered legitimate in ham radio circles each party must copy correctly the other parties callsign and preferably some other information such as a signal report.

DXMaps.com caught the action!

At 2314 I noticed Han’s signal had gotten louder so I called him again and made a solid contact straight away.  Success!  I was amazed my ‘barefoot’ (no amplifier, only 80 Watts output) Elecraft K3 transceiver and InnovAntennas 8 element LFA Yagi (an awesome antenna but it was on a tower parked at only 3 meters [10 feet ]above ground due to recent high winds) were making the 9,000 kilometer journey!  At ten feet up towards Japan my antenna was looking into a hillside!  I listened to Han work other stations for a few few minutes and savored the moment.

InnovAntennas 8 element 50-MHz LFA Yagi

Here’s a short YouTube video I made of JE1BMJ’s signal yesterday:

I would have likely made many more contacts if had started calling CQ earlier!  For a long time I was only hearing JE1BMJ so I didn’t bother calling CQ until around a full hour after opening started.  I had an ‘instant pileup’ after first my CQ call; clearly I should have started CQing much earlier – Doh!  I proceeded to work 18 more Japanese stations before the path closed:

Toshi ,JA0RUG, who I worked during this opening, sent me a MP3 recording of my signal as heard in Japan (click on link to listen to the audio):

2013June14-2340z-AA7XT-50.093MHz-CW

Here are the grids I worked during yesterday’s opening:

The WG7J Gridmapper is a great post opening analysis tool

The first hop was certainly Es as I was hearing loud stations in Oregon, Washington and British Columbia at reasonable Es single distance, but how about the rest of the way?  Han, JE1BMJ, the first station I worked in this opening, has developed a theory on these openings – which cluster around the summer solstice – and he has dubbed the mechanism “Short-path Summer Solstice Propagation” aka SSSP.  Articles on SSSP by JE1BMJ, W3ZZ, WB2AMU and KH6/K6MIO have been published in Dubus, CQ VHF, Six News and elsewhere.  Here are a few links:

• http://www.cq-vhf.com/vhf_highlights/2008_vhf/2008_fall_vhf/Fall08SSP.html
• http://k0ha.com/6m/ExtremeMultihopEsPubv2.pdf
• http://www.uksmg.org/content/g5kw/Short%20Path%20Summer%20Solstice%20Propagation%20bt%20JE1BMJ.pdf

So far, SSSP, if it in fact exists (such mysteries make 50-MHz DXing a fascinating avocation!) seems to be unique to the 50-MHz band.  I look forward to learning more about SSSP as more and more DXers become aware of the mode and watch for it.  Ham Radio is the exception to the ‘watched pot never boils’ rule of thumb.  In DXing, an unwatched band never opens!  One interesting note is that propagation like SSSP frequently repeats itself the next day so you can be sure I will be at my radio this afternoon!

73 and CU on the Magic Band!

Bill AA7XT

PS:  Some interesting recordings of 50-MHz DX signals heard in Japan by JE1BMJ can be found here (including yours truly):

http://audioboo.fm/han01a