Guest Post: Review of the Tecsun AN-07 whip antenna extender

Many thanks to SWLing Post contributor, Nicolás Colla, who shares the following review:

The Tecsun AN-07 is a whip antenna extender that is approximately 65 cm long. I bought mine from eBay seller Anon-co, and it arrived from Hong Kong in approximately twenty days.

The first thing I noticed with my new antenna is that it probably works only with Tecsun radios.

The antenna on my Degen DE-13 self-powered radio is too thin for the extension; the one on my Panasonic RF-3500 kitchen radio is too thick. I have another Tecsun antenna, the AN-05, which is a 6 m wire with a clip on the end that can be put on the radio’s aerial. I hung the AN-05 indoors, in the place with the least amount of RFI (just next to a window), and decided to compare the performance of my Tecsun PL-310ET with the default whip, the longwire and my new extension, on shortwave and FM.

For that, I made a quick scan of the bands with the Easy Tuning Mode (ETM) function of this radio, between 1330 and 1355 UTC. The results were the following:

Shortwave

With the default aerial: 3 stations found.

With the AN-07 antenna extension: 9 stations found.

With the AN-05 longwire antenna: 23 stations found.

As you can see, the AN-05, which is 6 times longer than the AN-05 (the aerial’s height is 1 meter with the added extension), gives by far the best results. Ironically, another scan with the AN-05 AND the AN-07 at the same time, with the clip adjusted on the extension, gives 29 different stations. I don’t know why, but it works better!

FM

With the default aerial: 42 stations found.

With the AN-07 antenna extension: 57 stations found.

With the AN-05 longwire antenna: 35 stations found.

The AN-07 seems specifically designed for FM reception, and it really shines on this band. The signal of a local station increases approximately +12 dbµV on this set’s signal meter.

In short, if you would like to get outstanding FM reception, or if you want to increase your shortwave signal quality JUST A BIT and don’t want to mess with wires, the Tecsun AN-07 is ideal.

Click here to view the Tecsun AN-07 on eBay.

Thank you, Nicolás, for the quick review! As you say, that’s impressive performance on FM especially. What I like about the AN-07 is that it’s passive and requires no power supply or batteries. It’s also compact and easy to pack for travels. Many thanks for sharing your evaluation!

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Video: Excellent aircraft scatter demonstration

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Many thanks to SWLing Post contributor, Robert Gulley, who shares this fascinating video from the Alps DX YouTube channel. In this short demonstartion, you can follow the flight path of an Airbus A320 and the signal from France Musique from Marseille as it is bounces off of the aircraft. Fascinating:

Click here to view on YouTube.

Description from YouTube: France Musique from Marseille / Grande Etoile on 94.2 received via Airscatter. I’m always amazed when I see and hear those signals coming out of nowhere when the plane crosses the path … Nothing a few seconds before, nothing right after. Radio is magic !

Equipment : ELAD S2 SDR + SDR# v1357, Airscout v1.1, 5 element Yagi (polar H).

I find this amazing. I’ll be the first to admit that I’ve never attempted FM aircraft scatter. Since I have an ADS-B receiver, and several excellent FM receivers, all I really need is a decent Yagi antenna and some careful planning.

Post Readers: Please comment if you’ve logged stations from aircraft scatter! Any tips?

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Ultra-Rare DX: Logging Radio Kahuzi in the DRC

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Many thanks to SWLing Post contributor, Dan Robinson, who shares the following guest post:

In these days of declining activity on the shortwave bands, we don’t often enjoy the experience of hearing what we might still call “rare” stations. The new year brought an exception.

On January 1st, 2019 I was tuning around the 48 meter band, which is largely populated by European pirate stations, utilities, and weather stations, when I heard a station on 6,210.20 khz. It was very distinct in that it sounded like an African station — music, with a male DJ/MC and religious songs.

What immediately came to mind was the religious station calling itself Radio Kahuzi, which is in Bukavu, Democratic Republic of Congo.

The station has been heard by DX’ers in a number of countries since the mid-2000’s and because it’s management is based in the U.S. it is possible to obtain a QSL verification.

Radio Kahuzi also has Twitter and Facebook channels, making it easier to communicate with station managers and staff, and has this blog site: http://radiokahuzi.blogspot.com/

As a You Tube video shows the station has been on the air since the early 1990s:

Click here to view on YouTube.

On January 1st, RK was heard from about 1730 to 1747 UTC when it shut down, playing what Richard McDonald, one of the station’s founders, says were musical pieces that are specific to RK.

On January 2nd, 2019 the station was heard again via Europe-based SDRs, signing off at approximately 1811 UTC.

Here is McDonald’s response to my report (which included an mp3) from January 1st, in which he notes that he even went so far as to give the main station announcer, Gregoire, my name and asked him to mention me in the station’s broadcast:

“I just shared with Gregoire that you had sent a recording of the last minutes of his closing musical sign-off if Radio Kahuzi and he agreed to greet you by name this evening and several days in several languages including English.

You got him saying his name at 5:54 into your recording yesterday,and the ID sign off Mountain Blue-Grass Music was unique to Best Radio Kahuzi in Bukavu!

Barbara Smith will be happy to send the QSL Card and info about us and our National Director and his family situation in case you have any suggestions

Powering off here! Our power cuts off with SNEL often — I just lost a longer reply to you !
But Keep Looking UP ! And Keep On Keeping ON !

Richard & Kathy McDonald”

By the way, according to Wikipedia, SNEL stands for Société nationale d’électricité “the national electricity company of the Democratic Republic of the Congo. Its head office building is located in the district of La Gombe in the capital city, Kinshasa. SNEL operates the Inga Dam facility on the Congo River, and also operates thermal power plants.”

A very interesting page containing the history of Radio Kahuzi, with information about the McDonalds, is at: http://www.besi.org/

As of the time of this writing, it’s unclear to me whether the extended broadcast times of Radio Kahuzi will be continued or if this was a one shot deal linked to the new year — we may have some clarification on this in coming days.

Here’s a video of my January 1st, 2019 reception of Radio Kahuzi:

Click here to view on YouTube.

For now, I am quite pleased to join the group of about 63 DX’ers around the world (that number comes from a link on the RK website called “Shortwave Listeners” that lists SWLs who have heard and contacted the station).

Though it is highly unlikely that Radio Kahuzi will be heard anytime soon in the United States (the station’s schedules shows it being active from 8 AM to 8 PM Bukavu time) at least using U.S.-based radios, whether SDR or traditional receivers, it’s nice to know that there is still a station out there (with 800 watts!) that is a real DX target!

Wow! What a fantastic catch, Dan! Thank you for sharing your catch and, especially, shedding light on this rare DX.

Post Readers: Please comment if you’ve logged and/or confirmed Radio Kahuzi.

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FTIOM & UBMP, January 6-12

“Crystals Go To War”: A 1943 film about the production of Signal Corps radio crystals

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Many thanks to SWLing Post contributor, Charlie (W4MEC), who shares this fascinating film which documents the production and calibration of crystals in 1943. I had no idea of the amount of labor and attention to detail this process required–an absolutely fascinating process:

UPDATE (08/09/2022): the YouTube account associated with this film has been deleted by the owner.

Click here to view this same film now hosted by the Antique Wireless Association.

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Washington Post looks at the “Last of the scanners”

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(Source: Washington Post)

Last of the scanners: Are police security measures and new technologies killing an American obsession?

In a white house on a quiet, leafy street in Takoma Park, Md., lives a man who listens to nothing but mayhem. He is remarkable not because of his appearance — tall, thin, black hair — but for what he has around him at all times: scanners.

On this day, the scanners of Alan Henney — whose tweets of bedlam are followed by dozens of Washington journalists — were going full blast. Eleven cluttered his coffee table and living room, all tuned to different radio frequencies from across the region. There was the chirp of D.C. Fire and EMS responders. The prattle of dispatch in Prince George’s County. And the broadcast of Montgomery County officials telling of a traffic accident, which, Henney concluded solemnly, “doesn’t sound very good.”

Something else that didn’t sound very good: the garbled noise coming from one scanner, obscuring D.C. police chatter. To Henney it sounded like death — not the death caused by crime or traffic accidents, but the demise of a passion.

Across the United States, there are hundreds, if not thousands, of people like Henney who listen to official communications on radio signals, sifting through a morass of chatter for interesting news. Some pester crime reporters with tips. Others, such as Henney, showcase the hard-won news items — like gem hunters would a stone — on their social media feeds. But soon, Henney fears, all of that may end. And what will become of the scanner enthusiasts when there’s nothing left to scan?

Over the past few years, an increasing number of municipalities and police departments, including the District’s, have begun encrypting their radioed communications, a trend driven in part by fear that bad guys and terrorists need to do little more nowadays than download a police-scanning app to get all the intelligence they need on what police are doing and where. Just this year, police in Las Vegas, Richmond and Knoxville, Tenn., have encrypted their radio communication.

But what police are calling a public safety measure, scanner hobbyists are describing as a blow to transparency. Now they’re asking plaintive questions about whether it portends the end of a pastime once incubated in science clubs and Scout groups.[…]

Click here to read the full article at the Washington Post.

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From the Archives: Radio Australia rings in the millennium

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Dear SWLing Post Reader,

It’s New Year’s Eve and as I do each year, I’ve been spending time on the radio tuning around the bands–crossing borders and time/date zones at will. Most broadcasters spend this day going over events of the year, playing music and looking back. Some even have an in-house on-air party of sorts when they slip into the new year. It’s always fun.

I remember very fondly the full day I spent at the radio as we entered the year 2000. I wrote a post about this and published a recording several years ago. I decided it was time to pull that post from the archives and put it on the front page once again. I hope you enjoy it.

Since this post was first published, Radio Australia has gone off the air of course, so I find recordings like this even more meaningful.

Here’s wishing you and yours an amazing New Year!

-Thomas

Radio Australia rings in the millennium

Yesterday–New Year’s Eve, 2014–I spent some time listening to a few broadcasters as the new year passed through their time zones. While I missed hearing Radio New Zealand International (the first to welcome the New Year on the air), I did manage to catch Radio Australia, and the New Year was celebrated with no fanfare; one program merely ran into the next, and there was a brief mention of 2014’s arrival in the headline news.

Oh, but it wasn’t that way when we moved into the year 2000…

Rewind 14 years

Back in December of 1999, before setting off to visit family for the New Year, I had a sudden notion: I decided it would be fun–and a bit novel–to record radio broadcasters as each moved into the new millennium. As we were packing the car to travel, I changed my mind about using my Grundig Yacht Boy 400 to accomplish this fairly ambitious, round-the-world listening/recording endeavor; instead, I grabbed my ham radio transceiver, an Icom IC-735, and packed it, along with a hefty 12-volt power supply. While my IC-735 lacked AM filters (at the time) it had much better sensitivity than the YB400, especially when hooked up to a decent antenna. I also had the foresight to take along a few odds and ends, including a mechanical antenna tuner and a spool of long wire.

The Icom IC-735

To record the broadcast, I used my trusty Aiwa AM F70 MiniDisk recorder–remember those? Upon arrival at our extended family’s home, they kindly permitted me to erect a long wire antenna in a sloping configuration in their yard. It did a fine job netting the airwaves. The MiniDisk recorder recorded brilliantly, allowing me to monitor levels and even edit afterward.

As a result, I spent New Year’s Eve 2000 recording station after station as the earth turned. It was great fun, and meanwhile had very little impact on our family celebrations as I simply left the recorder running for long periods of time.

My trusty Aiwa AM F70 MiniDisk recorder.

While I have yet to dissect the many hours of recordings, if memory serves, I think I managed to record Radio New Zealand International, Voice of Russia, Radio France International, NHK, Voice of America, and Radio Canada International as each rang in 2000. The IC-735 performed quite well, save a lack of bandwidth filters, as I only really had two–very wide, and very narrow.

So, for your New Year’s Day listening pleasure: I hope you’ll enjoy, as much as I did, listening to Radio Australia ring in the new millennium yet again. In the news items, you’ll hear that Russian President Boris Yeltson has handed the reigns over to Vladimir Putin, and remarks about the (lack of) problems resulting from the infamous Y2K threat.

Click here to download the recording as an MP3, or simply listen below: