Tag Archives: USB power

Radio Waves: New BBC Ham, Russian Propaganda, Rotators, USB Continuity, and a Moment of Silence

Radio Waves:  Stories Making Waves in the World of Radio 

Because I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest SWLing Post readers.  To that end: Welcome to the SWLing Post’sRadio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors, Marty, Mike Terry, and Tracy Wood for the following tips:


BBC World Service presenter is a radio amateur (Southgate ARC)

Gareth Mitchell M7GJM is well known as presenter of the BBC World Service show Digital Planet. He got his amateur licence in 2019 thanks to help from members of Essex Ham

Since getting his licence, Gareth M7GJM has been mentioning amateur radio in his BBC World Service show, most recently, featuring how radio hams in Australia have been helping with emergency comms.

Read the Essex Ham story at
https://www.essexham.co.uk/news/online-learning-and-exam.html

Information on the free Foundation Online course that Gareth took is at
https://www.essexham.co.uk/train/foundation-online/


Russian ‘Propaganda Machine’ Selects Kansas City As Its Second Radio Broadcast Site (KCUR)

Commuters interested in conspiracy theories about George Soros, Hillary Clinton and the Republican National Committee have a new option, courtesy of the Russian government.

Early this month, a radio station based in Liberty, Missouri, signed a three-year deal to broadcast Radio Sputnik across Kansas City.

The English-language programming airs for three hours each morning and again in the evening on three frequencies controlled by KCXL: 1140 AM, 102.9 FM and 104.7 FM.

It’s produced by the U.S.-based branch of an organization created in 2013 by Russian President Vladimir Putin to promote Russian interests abroad.

The organization, Rossiya Segodnya, hopes to restore a “fair attitude to Russia in every country in the world,” according to court records.

For now, Radio Sputnik only broadcasts in two American cities: Kansas City and Washington D.C., where its programming has aired since 2017.

“We’d love to broadcast in all major U.S. markets,” a Radio Sputnik spokesperson told KCUR via email. “But unfortunately, U.S. authorities are working really hard to prevent us from doing so.”[…]


Rotators – How do you turn that thing? (Nuts and Volts)

We’ve had a few columns on antennas and propagation, and there sure is a lot of variation in the types of antennas! All the different ways signals propagate require different antenna directions and types. Hams use dinky finger-sized “rubber ducks” on handheld radios but also some ridiculously big antennas it seems. Hams can’t use as much power as some of the other communication services, so they use antennas to get through by focusing radiated power.

If the antennas can focus a signal, then they need to be able to focus it in the desired direction, right? A few antennas can do that electrically by controlling the signal’s phase or switching antenna elements on and off. Most of the “pointable” ham antennas, though, need to be pointed mechanically and held in place during a contact or to keep a communications link working. The thing that hams use to point their antennas — large and small — is called a rotator.

There are a wide range of rotators, just like antennas. You may have used a TV antenna rotator with its “chunk-chunk-chunk” stepping. At the other end of the scale, whole towers turn! We’ll cover some of the most common types and give you an idea of how they work. (If you want detailed information, including guidelines and illustrations for how to work with these unsung heroes of the antenna farm, see the sidebar, “Rotator and Tower Know-How.”)


Build a USB continuity jig (Nuts and Volts)

If you’re like me, you likely have a drawer or shoebox stuffed with assorted USB cables that are used to either charge or program a USB device. The problem often is that some cables may only be useful for charging, and which only have the +Vcc and ground wires intact with one or both data wires either broken or not connected in the first place.


Every Radio Station in Los Angeles Holds Moment of Silence for Kobe Bryant (Billboard)

Los Angeles has been rendered speechless by the shocking death of NBA legend Kobe Bryant, his 13-year-old daughter Gianna “Gigi” Bryant, and seven others in a helicopter crash in Calabasas, Calif., on Sunday morning. And for one minute and eight seconds — the extra time nodding to Bryant’s original No. 8 Lakers jersey — radio stations across the city held a moment of silence Monday (Jan. 27) at noon.

The Southern California Broadcasters Association asked its members to synchronize their moment of silence, as well as continuously airing reminders about the upcoming tribute.

Before noon, the SCBA requested all local area radio stations to repeat this core introductory message for grieving Angelenos listening in: “Right now All LA radio stations are now broadcasting 1:08 minute silence for LA Sports Legend Kobe Bryant,” according to an announcement posted on the association’s website.[…]


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Steve searches for a USB-powered battery charger for solar recharging

Many thanks to SWLing Post contributor, Steven Crawford, who writes with the following inquiry:

[I’m searching for] good quality USB powered battery chargers for AA and D size rechargeable batteries.

Wall outlet chargers are common but quality USB powered battery chargers appear much less common…less common than the packable solar panels with USB ports such as Anker’s, that could be used to power them. Ideally the charger should handle Nicad’s, NIMH and Ii-on but have standardized on AA, AA + D adapter sleeves, and D batteries for my storm supplies.

If I understand correctly, you’re searching for a good qualityUSB-powered battery charger that supports multiple battery chemistries (nickel-cadmium, NIMH and lithium ion) so you can recharge AA, AAA and D batteries with a portable solar panel.

I’m hoping SWLing Post readers can offer some suggestions.

I’ve also looked into this type of charger for both Ears To Our World and my own personal use when off-grid in the summer. I’ve never found one that truly supports all of the battery chemistries you mentioned. The one I’ve used (an EBL) works quite well, but only supports NiMH AA and AAA batteries. As you mentioned, you can use D cell sleeves with the AAs.

EBL makes a number of USB chargers that can be found by searching Amazon. This one–an EBL Quick Charger (affiliate link)–can recharge NiMH batteries within 40 minutes and I’ve personally used one. I’ve been pleased with EBL batteries as well.

I never use nickel cadmium rechargeable batteries at this point, so really don’t know what’s available on the market.

I have found that there are a number of USB-powered lithium battery chargers, but typically for specific lithium cell configurations like 18650, 16340, 14500, 26650, etc. Some of these inexpensive chargers have magnetic contacts that can fit almost any battery type and on Amazon and eBay they claim to recharge multiple battery chemistries, but frankly I’m quite skeptical. These $9 devices don’t seem to have a way of detecting battery chemistry, thus I’m not sure how they would adjust the charging cycle accordingly. Perhaps I’m incorrect in this assumption?

Other than using Powerfilm solar NiMH battery chargers (I can recommend these) which are incorporated in their folding panels, I’ve never charged batteries directly from a solar panel. Typically I have a 9ah or larger 12V battery floating between the PV panel and the charger.

I’ve found that using a 12VDC charger–like this–that’s pulling power from a 12V battery is simply a little more efficient, faster and reliable than charging directly from a small PV panel. Since I always have 12V batteries on hand when off grid, it’s a simple solution for for my system.

Post readers: do you have any USB-powered battery charging suggestions for Steven? Please comment!

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USB Battery Pack Keep-Alive Load Kit

(Source: Southgate ARC)

USB power banks are a convenient way of powering low power USB devices in the field. Unfortunately, as they are designed for charging phones and tablets, many have an internal electronic cut out circuit that switches power off below a certain current draw. The exact current that they switch off at varies from pack to pack.

Although there are circuits on the internet that purport to solve this problem by applying a pulsed load, we found this did not work with all power banks. As a result we designed a neat variable electronic load to address this problem.

Available as a kit, using it is easy; just plug it into your power bank, plug your target device into it and adjust the current draw until the pack remains on.

http://www.sotabeams.co.uk/usb-battery-pack-keep-alive-load-kit/

This could be a handy tool for those of us who use USB battery packs for portable work. SotaBeams originally created this simple kit for the WSPRlite.

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