Category Archives: Accessories

Reminder: Only two days left to enter our latest radio challenge!

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Enter our challenge and you could win this prize package worth over $200 courtesy of CountyComm!

Let’s imagine that your area suddenly loses power–as well as cell phone and internet service–for an indeterminate period. Home and personal electronics remain unaffected, but must be powered off-grid (without mains power).  Moreover, you may be required to evacuate your home…perhaps even on foot.

In preparation for this event, what portable radio kit would you assemble?  

Submit your answer to this question and you could win a preparedness prize package courtesy of CountyComm!

All entries must be received by November 21, 2015.

Click here to read about this challenge and how to submit your answer!

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New kit by NM0S: the 4S-Tuner/Antenna Coupler

4stuner_panelDave Cripe (NM0S) has designed yet another QRP kit for the 4 State QRP Group: the 4S-Tuner/Antenna Coupler.

Description (per Four State QRP Group):

This excellent random wire antenna tuner is the classic T-Match design which is known for wide matching range and smooth operation. Dave has added a nice wrinkle – the SWR indicator employs TWO leds, not the normally seen single red LED. A green one indicates output power with a red one indicating reflected power. The beauty of this arrangement is that the operator sees the output power peaking as the SWR goes down, just like a power meter with dual meters – very intuitive. This makes tuning easier and leaves no doubt that it’s tuned for maximum power output. For a high SWR the red LED is at full brightness and the green LED is off. At 2:1 both are at equal brilliance. At 1:1 the green is full on and the red is off. The small size is perfect for portable operations. Add this dandy little tuner to your portable ops go bag, or use it at home. It’s equally at home on a picnic table, in a tent or camper, as well as on the operating desk in your shack.

Specifications and Design Features

  • Wide tuning range: 80 meters thru 10 meters. Tested on EFHW and 100′ wire.
  • Maximum Power Throughput: tested at 10 Watts.
  • Low loss large toroid
  • Twelve taps for small inductance step selection.
  • Low insertion loss when matched.
  • Enclosure Size: 3″x3″x2″.
  • Pittsburg Construction.

Shipped price is $51.00 (US), $55.00 (Canada), $60.00 (Outside US/Canada).

Dave Cripe designs excellent kits for the ham radio community; they’re easy to build, fun and functional.  If this kit is as popular as his past kits, the first run will most likely sell out in short order.

 Click here to check out the 4S-Tuner/Antenna Coupler at the Four State QRP Group website.

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Bill’s simple Sony SRF-59 passive loop antenna modification

Sony-SRF-59-AM-Loop-Antenna

In reference to our previous posts about the Sony SRF-59 ultralight receiver, SWLing Post reader, Bill Mead, writes:

“As someone who doesn’t normally open the backs of radios, this is my mod on my ultralight. All it takes is a bit of electrical tape to hold the belt clip on the loop.”

That is, indeed, a brilliant and simple mod. The SRF-59 inductively couples to the loop antenna, so no soldering is needed; simply tape the belt clip to the loop, making sure the position is convenient for tuning the SRF-59 and the loop’s capacitor.

You can find passive loop antennas ranging from $19 to $50 US. The Grundig AN-200 and the Terk AM Advantage are two models currently on the market. Here are a few places you can check prices:

Grundig AN-200:

Terk AM Advantage:

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TASS: An Arduino-based antenna switch

TASS

Many thanks to SWLing Post reader, Stan (WA1LOU), who writes:

“Enjoy your blog. I have been reading it for years. [H]ere is something your readers might be interested in that I mentioned in my blog today:

http://www.horzepa.com/2015/09/computer-controlled-switch-system.html

Very cool! Goes to show that there are a countless number of applications for the Arduino system to be used with amateur and shortwave radio.

Click here to read Stan’s informative post, and here to order the TASS system from TAPR.

John Ackermann also produced this informative presentation/video about the system:

https://youtu.be/P-TUM2dOi4c

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The Oxo Good Grips Turntable for the Mediumwave DXer

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SWLing Post contributor, Robert Gulley, writes:

I recently purchased an Oxo Good Grips Turntable, 16” from Amazon. As the photos show, the size of the turntable can hold a fairly large radio (CC Radio EP and Select-a-tenna) on the turntable in almost any configuration. (Of course the CC Radio EP doesn’t need the Select-a-tenna, just used for illustration purposes for size.)

At $16.99 I think it is a good bargain, and seems quite capable of turning smoothly even with this amount of weight.

Click here to view on Amazon.com.

turntable1

Many thanks, Robert! I think that turntable is large enough to hold pretty much any portable radio; thanks so much for the photos (especially the one your kitty cat photo bombed, above!). I have several OXO products in my kitchen and have never been disappointed with quality, so I expect this turntable will last you a very long time.

Readers: If you haven’t checked out Robert’s radio blog, All Things Radio, I encourage you to do so!

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Review: the Waka Waka Power+ portable solar charger

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In my role as director of our 501(c)(3) charity, ETOW, I’m always on the lookout for technologies that could improve the lives of those living at or below the poverty line in remote and sometimes politically-charged regions of the world that are usually off-grid. At ETOW, we prefer simple, rugged technologies that require no learning curve, that can be easily maintained, and that offer exceptional benefit to our users. Self-powered radios, of course, are  ETOW’s mainstay, but we’ve also provided digital recording and playback devices, solar and hand-cranked power generation, and, of course, lighting.

When I first learned about the Waka Waka Power+, I had ETOW in mind. I reached out to Waka Waka and they sent a sample for me to evaluate.

The flip cover has detents which allow you to angle the solar panel for optimum solar tracking.

The flip cover, which acts as a stand, offers detents which allow the user to angle the solar panel for optimum solar tracking.

The Waka Waka Power+ is a small, lightweight portable power supply built on a 2200 mAh LiPo battery pack. A built-in solar panel occupies one full side of the device, which charges the battery when placed in sunlight.  On the other side of the device–behind a flip cover–is a large round power button and two protected Cree LED lights.

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After charging my Tecsun PL-380, the Power+ still had about 50% of its battery available.

On top side of the Power+ is a row of four green LEDs that indicate the battery level.

The body seems to be made of a very durable plastic designed to operate in temperatures up to 80 °C (175 °F). It has a smooth surface and gasketed USB ports. The LEDs are protected behind clear lenses.

Flashlight

Let’s face it: operation of this flashlight is dead simple.  No learning curve here, which suits ETOW’s use brilliantly.  And brilliance, indeed, is what the device provides.

Press the large power button once to check the battery status; press twice, and the LED lamps are activated at their brightest setting–about 70 lumens, which lasts about 10 hours on full charge.

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Each consecutive press decreases the LED brightness for a total of four brightness settings. The lowest LED setting (about 5 lumens) is perfect for reading, and should increase the light’s longevity to approximately 150 hours with a full charge.

Emergency?  If you press and hold the power button for two seconds, the Power+ will flash “SOS” in Morse Code.

The Power+ also has a hole in the tilt base that allows you to perch it on top of pretty much any bottle and become a table lamp.

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I used a bottle of single-malt, but any bottle will do!

You can also loop a string through the central hole and hang the Power+ from the ceiling–or the roof of your car or tent–for an overhead lamp. Fantastic design for useability!

Charging

The Power+ has two USB ports:

  • a micro USB for charging the Power+ from any other USB charger (cell phone charger, USB port on PC, etc.)
  • plus a full size USB port to charge other devices on the go (your smart phone, or–for our purposes–a shortwave radio)

If you plug your Power+ into a typical smart phone charger or a USB port on your computer, it will charge the battery in about four hours.

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If you’re on the go, or simply want to go green, you can charge the Waka Waka Power+ internal battery with the solar panel directly facing the sun. It takes about two days of sunny skies to fully charge the Power+.  But you can use it even if not fully charged.

Most of the time I’ve used solar power to charge, I started with a battery at 50%–it took perhaps five to six hours of sunlight to bring the battery to full capacity.

Summary

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The Waka Waka Power+ is the first solar-powered portable charging device that has actually impressed me. I’ve tested numerous flashlights and portable battery packs over the years; many have been effective as smart phone chargers, but were heavy or unstable (one, for example, literally melted down on my bed while charging–no kidding).

Clearly, I like the Waka Waka Power+. I’m especially impressed because this seems to be Waka Waka’s first product iteration. The Power+ is small, lightweight, tough (though not waterproof) and delivers what it promises.

Negatives? Well, the only one I can think of at this point is that it takes almost two days of sunlight (at least, where I live in North America) to fully charge the Power+ via the sun. It could take longer if you live in an area with less sunlight hours. To be honest, however, I’m still fairly impressed that a PV panel as small as the one on the Power+ charges this quickly.

I’ve charged my Moto X (2nd gen) smart phone several times during my travels; it even came to my rescue when I left my phone’s mobile charger at home and had nearly depleted my battery while using the phone’s GPS to find my way in unfamiliar territory.

WakaWakaPowerPlus-and-PL-800

I’ve also used the Power+ to charge my Tecsun PL-380, PL-310ET, and PL-880 shortwave radios. In each case, I effectively charged the radio’s battery from roughly 25% to 100%.

The Power+ easily fits in my Spec-Ops Brand Op-Order Pouch and even my Maxpedition EDC Pocket Organizer. It’s an ideal size to carry pretty much anywhere, and especially useful for one bag travel.

I also think the Waka Waka could be quite useful in some of the countries where ETOW works.  They could have especial relevance in regions where mobile phone networks are in place–increasingly prevalent in rural Africa–but our ETOW partners (teachers and community supporters) have no means of powering the phones or else can’t afford to power them. I’ll certainly order a few and test them in the field.

WakaWakaPower+

The icing on the cake–? When you purchase a Power+, Waka Waka will donate a Power+ for humanitarian use (not yet to ETOW, but to other worthy organizations) through their network.  It’s a “get one, give one” deal–and believe me, this helps out.

At $79 US, this is a bargain for a cool little charger/flashlight that actually delivers as advertised.

The Waka Waka Power+ can be purchased

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