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Many thanks to SWLing Post contributor, Bob (K7ZB), who shares the following note and recording:
Hi Thomas,
I recently started using an SDRplay RSP1A with their new software release SDRconnect.
Quite a nice piece of work and my first foray into SDR after 60 years of analog radio (K7ZB).
Today I was listening to WWV on 10MHz and it was being interfered with a strange type of digital signal that pretty much covered the band.
I finally tracked it down to 9.979MHz, recorded it and sent it to a friend who did a bit of audio analysis on it by expanding out the signal to look at individual bursts.
I certainly don’t recognize the modulation although it sounded like a form of CW in burst mode.
I am just curious if you have any insight on this signal or where I might go to find out more about it.
Thanks,
Bob
K7ZB
Gilbert, AZ
Post readers: Can you identify this signal? If so, please comment and thank you in advance!
Many thanks to SWLing Post contributor, TomL, who shares the following guest post. Click here to check out all of the posts in this Audio Plugin series:
Audio Plugins For Radios, Part 3 – VST Technical Setup
by TomL
Processing legacy audio still has a place in an increasingly digital world for the time being. The first article on this topic was strictly using the speaker jack output from an old Kenwood transceiver using a simple Behringer UCA-202 RCA-to-USB converter. However, my main receive radio is the SDR based AirSpy HF+. Either type of radio should work with the apps discussed below as long as the audio gets to your Windows computer unmolested. There are VST apps for Mac and Linux, too.
VST apps: VST3/VST2/DLL files
Also mentioned was how to install VST Host and the VST apps run inside it. A simple reminder is that VST Host does not really install. It just resides in any one Directory/Folder you want and you create a shortcut to run VSTHOST.EXE. All the .XML files and profiles will be stored there.
I like tinkering with many apps but you may prefer things a lot simpler. I use 64-bit versions when possible, like VST3 and x64 DLL files. Because of the myriad settings involved, I will just list the apps in order of processing with brief comments. The second icon on the top of each app opens up its control panel and the bottom left icon will Bypass the app as if it is not in the audio chain. The top-left icon Links to the Preceding app in the audio chain. Most controls inside the apps let you double-click on that control to reset to a default.
The general functional order of these apps is:
Limiting/Compressing volume – dealing with shortwave signal volume spikes plus judiciously squeezing high & low volumes for a more even sound.
High Pass & Low Pass Filters – limit the frequency range apps will need to work on.
De-noising – the biggest challenge in shortwave is to reduce static and local noise without damaging the wanted audio.
EQ adjustments – frequency tweaks.
De-essing – getting rid of screechy “sss”, “shhh”, and “squeak” noises as well as fading distortion, perhaps the second hardest thing to do.
Then a final Drive/Gain control to feed into the Windows mixer.
Special Effects apps, like adding stereo, or reverb, etc.
I would suggest not to spend any money until you get to use apps from each of these broad categories to understand how they work. It is very easy to destroy the audio with a couple of offending settings. If you need help with understanding how plugins work, there are plenty of YouTube videos available. One channel I like is “In The Mix” from a Scottish music production engineer, Michael Wynne (over 1 million subs!). He gives simple to understand instruction videos (especially EQ and Compressors), among other topics.
Welcome to the world of Audio Production. Here are some plugins (most are FREE!):
Reaper ReaComp – A Compressor which I am using to limit volume spikes in the <300 Hz range.
Kotelnikov – A great dynamic Compressor that helps compress volume peaks in both Peak and RMS (average) levels. Useful for highly variable signals and highly recommended.
Reaper ReaFir – A dynamic processor, the Subtract feature is a special “negative EQ” which only reduces specified frequency “Points”. It is also used as a brick filter for low & high frequency limits.
Klevgrand Brusfri Denoiser – In Swedish, “brusfri” means “noise free”, and is a Denoiser app that functions similarly to Audacity’s Noise Reduction feature but works in real time. I move to a blank frequency on the same shortwave band, have Brusfri “Learn” for about 5 seconds, and it starts working.
Bertom Denoiser Pro – A good Denoiser app but on noisy shortwave it can have digital artifacts that get very loud. I use it sparingly immediately after Brusfri.
Bitsonic Sound Recovery – This app beings midrange more forward and can brighten up dull audio. However, it can lead to increased sibilances, accentuated fading distortion, and “boxy” sounding voices.
TDR Nova – A clean sounding parametric EQ; my settings are a work-in-progress for best settings. I am experimenting with having the Wideband setting do most of the work with a slight expansion of the audio coming from the SDR. Also used as a better Gain control for Bitsonic.
Modern Exciter – Set to MIN for shortwave, this app can enhance the extreme low and extreme high frequencies without increasing noise.
LOADES – A DeEsser from Analog Obsession, controls sibilance and squeaks (beware of wonky controls!).
Klevgrand Brusfri Denoiser & Bertom Denoiser Pro run a second time. More Denoising is needed after the processing done by Bitsound, TDR Nova, and Modern Exciter.
Klevgrand FreeAmp – A simple Drive and Gain control that was free when I purchased Brusfri. It makes sure audio is driven correctly into Voicemeeter AUX Input.
Voxengo Stereo Touch – Allows adding “stereo” to a mono signal. Various Presets are available, from narrow (Voice or Guitar) to wide soundspaces (Stage, Surround, and Wide). Very interesting!
Here are three VST Host processed .MP3 files from an IQ recording of Radio Amazonia using 5.3 kHz & 7kHz filters in SDR Console 3.2 (Noise Reduction 4 was used but only 1dB Reduction). The third one is using the Stereo Touch app using just the lowest setting (Voice). I like it! 🙂 :
DW is now broadcasting a 30-minute daily Arabic-language radio program entitled “Sudan Now” on shortwave, Hotbird and SES-5 satellites and via the DW Arabic website.
As an unbiased radio program, “Sudan Now” will provide listeners in the target region with unbiased coverage of current issues in the region and will promote political, social and cultural dialogue through interviews, talk shows and reports.
Given the lack of independent information sources in Sudan and the limited ability of established media to broadcast due to internet outages and ongoing fighting, “Sudan Now” was specifically designed to be broadcast on shortwave and via the Hotbird- and SES-5 satellites. The satellite broadcast enables listeners in the target region to receive the program via their TV sets.
DW Managing Director Programming Dr. Nadja Scholz: “The conflict in Sudan is ongoing and has far-reaching effects on the entire region. It is absolutely necessary to provide the people there with a dedicated program that enables them to access independent, current and in-depth information. With shortwave radio, we further increase our ability to reach as many people as possible.”
Manuela Kasper-Claridge, DW editor-in-chief, said: “The humanitarian situation in Sudan remains catastrophic. There is a lack of everything – including free, independent information. This Arabic-language radio program is therefore urgently needed.”
The program broadcast will begin on Monday, June 26, 2023. It will air daily from Monday to Friday at 2:30 pm (local time, GMT+2) for a duration of thirty minutes. A repeat of the radio program will air daily at 8:30 pm.
“Sudan Now” can be heard in the afternoon on shortwave 15275 kHz/17800 kHz and in the evening on shortwave 15275 kHz/17840 kHz.
In addition, all broadcasts will be available on the DW Arabic website.
[…]Radio Ink: When Justin Sasso briefly mentioned KLMR’s story at Hispanic Radio Conference, it piqued the room’s interest. That’s a powerful AM story. How did this come to pass with you both?
Dan: So about a year ago in late July, KLMR was blown off the air from a micro-downburst. The previous owners couldn’t fix it and they were in danger of losing the license. When I saw the building, half the roof was gone and the antenna was dangling in the wind.
I’ve been in the radio business in Colorado for 40 years, with the last 20 in Colorado Springs, but I’ve never owned a radio station. And so when this opportunity came about, I reached out to Kirk. We had talked about possibly buying a company in Lamar previously. He’s not just the mayor, he’s my brother-in-law, but it was great that the mayor wanted to get involved in it too. So we’re off and running.
Radio Ink: For a mayor to step up and say, “This AM station is so important to my community that if nobody else will save it, I will,” is a huge testament to AM radio’s power and value.
Kirk: It’s vital. That’s what I had mentioned to Justin in that meeting about AM. When we look at rural Colorado and the ag market there, there’s a necessity for that. [Continue reading…]
The number of satellites whizzing by over our heads at any moment is staggering, and growing at a rapid rate as new constellations are launched. But sometimes it’s the old birds that are the most interesting, as is the case with some obsolete but still functional military communications satellites, which thanks to a lack of forethought are largely unsecured and easily exploitable. And all that’s needed to snoop in on them is a cheap ham radio and something like this simple and portable satcom antenna.
As proof of the global nature of the radio hobby, the design in the video below by Brit [Tech Minds] borrows heavily from previous work by Italian ham [Ivo Brugnera (I6IBE)], which itself was adapted to use 3D-printed parts in a German blog post a few years ago. [Continue reading…]
Hello shortwave listeners! With a new month just around the corner, I wanted to provide an up to date broadcast schedule for my transmissions to North America.
This radio program is 1 Hour in length and features miscellaneous discussion (sometimes about current events, other times about random subjects on my mind) at the start of the program and is then balanced out with listener requested music. I hope for it to be an enjoyable light entertainment program with good music and discussion!
There are two new shows each week, along with various repeat airings for listeners who might not be able to catch the new shows as they first air.
Main Broadcasts:
Saturday 0600 UTC (2 AM Eastern / 1 AM Central) – 4840 kHz – WWCR 100 kW – North America
Monday 0400 UTC (12 AM Eastern / 11 PM Central Sunday Evening) – 4840 kHz – WWCR 100 kW – North America
Repeat Airings:
Tuesday 2000 UTC (4 PM Eastern / 3 PM Central) – 15770 kHz – WRMI 100 kW – Eastern North America
Thursday 1600 UTC (12 PM Eastern / 11 AM Central) – 15770 kHz – WRMI 100 kW – Eastern North America
Friday 2100 UTC (5 PM Eastern / 4 PM Central) – 9955 kHz – WRMI 100 kW – South America
Saturday 0700 UTC (3 AM Eastern / 2 AM Central) – 1300 kHz – WNQM 5 kW – Tennessee
Saturday 2200 UTC (6 PM Eastern / 5 PM Central) – 6115 kHz – WWCR 100 kW – Noth America
Saturday 2300 UTC (7 PM Eastern / 6 PM Central) – 5950 kHz – WRMI 100 kW – North America
Many thanks to SWLing Post contributor, Kelsie, who writes:
Hi Thomas,
We have just launched a new bi-weekly music show on WRMI. Underground Sounds will be playing the freshest tracks by new and established independent artists from all around the world, together with the latest music news, exclusive performances, and interviews. The first show went out on June 25th, with the next due to go out on Sunday July 9th, with new shows occurring every other Sunday at 2100 UTC on 15770 kHz.
W9IMS Accelerates into Another Special Event Season – with a Chance for an Indy Racing Certificate
By Brian D. Smith
It’s back to the track for collectors of W9IMS cards and certificates.
The first of this year’s three special events tied to the major races at the Indianapolis Motor Speedway will begin at midnight Eastern Time (0400 UTC) this Sunday, May 7, and continue through 11:59 p.m. (0359 UTC) the following Saturday, May 13.
And for hams and SWLs, your chance for a 2023 Checkered Flag Award begins – and could end – with it. To earn the certificate, you’ll need to contact or tune in W9IMS during all three special events this year: the Grand Prix, the Indianapolis 500 (May 22-28) and the NASCAR 200 at the Brickyard (August 7-13).
Catch W9IMS during Grand Prix week and you’re one-third of the way to Victory Lane. Miss it and you’ll have to wait till 2024 for another shot at the certificate.
So when and where do you find W9IMS? Any time of the day or night is possible, but prime time is from 6 to 10 p.m. (2200-0200 UTC) weekdays, and the prime bands are 40 and 20 meters (generally around 7.245 and 14.245 MHz). And this year, improved solar conditions could prompt a rare move to 15 and 10 meters, likely around 21.350 or 28.340 MHz.
The choice of frequencies will be gametime decisions based on a variety of factors, including QRM, band openings and the number of calling stations. So your surest move is to check W9IMS spots, which are frequently posted on DX Summit (www.dxsummit.fi).
While some on-air times are unscheduled, you can also increase your odds by going to the W9IMS QRZ page (www.w9ims.com) and clicking the Grand Prix link under the heading “2023 Operating Schedule” – which displays the shifts that operators have already signed up for.
If time is running short, listen for happy hour – the last blast on Race Day (May 13 for the Grand Prix), usually starting at 11 p.m. Indy time (0300 UTC). That’s when W9IMS ops traditionally switch to contest-style QSOs and exchange only signal reports so they can work as many stations as possible. But remember that W9IMS special events can end early if the station encounters sparse QSOs or adverse solar or weather conditions.
Should you manage to bag W9IMS, don’t celebrate for too long: The Indianapolis 500 special event begins on May 22, only 9 days after the end of Grand Prix week. Then comes the longer wait till the NASCAR race in August.
You’ll qualify for a new and unique QSL card for each W9IMS event you log, regardless of whether you snare all three in ’23. But why not complete the set and nab the certificate – starting with the first race this coming week?
Hams and SWLs alike are eligible for any and all W9IMS cards and certificates; you can even QSL via the bureau. And if you forgot to send in your information from a previous year, it’s still possible to obtain nearly all of the previous cards and certificates. Consult the W9IMS QRZ page for full details.
Hello shortwave listeners! I wanted to make this post in order to provide an updated broadcast schedule for my transmissions to North America for the Spring of 2023.
This radio program is 1 Hour in length and features miscellaneous discussion (sometimes about current events, other times about random subjects on my mind) at the start of the program and is then balanced out with listener requested music. I hope for it to be an enjoyable light entertainment program with good music and discussion!
Main Broadcasts:
Saturday 0600 UTC (2 AM Eastern / 1 AM Central) – 4840 kHz – WWCR 100 kW – North America
Monday 0400 UTC (12 AM Eastern / 11 PM Central Sunday Evening) – 4840 kHz – WWCR 100 kW – North America
Repeat Airings:
Tuesday 2000 UTC (4 PM Eastern / 3 PM Central) – 15770 kHz – WRMI 100 kW – Eastern North America
Wednesday 1300 UTC (9AM Eastern / 8 AM Central) – 15770 kHz – WRMI 100 kW – Eastern North America
Thursday 1600 UTC (12 PM Eastern / 11 AM Central) – 15770 kHz – WRMI 100 kW – Eastern North America
Thursday 2200 UTC (6 PM Eastern / 5 PM Central) – 9955 kHz – WRMI 100 kW – South America
Friday 2100 UTC (5 PM Eastern / 4 PM Central) – 9955 kHz – WRMI 100 kW – South America
Saturday 0700 UTC (3 AM Eastern / 2 AM Central) – 1300 kHz – WNQM 5 kW – Tennessee
Saturday 2200 UTC (6 PM Eastern / 5 PM Central) – 6115 kHz – WWCR 100 kW – Noth AMerica
Many thanks to SWLing Post contributor, Bob (K7ZB), who shares the following note and recording: 
