Author Archives: Thomas

Tecsun AN-48X Loop Antenna: One simple suggestion to improve performance

Many thanks to SWLing Post contributor, Robert Richmond, who writes:

I recently received the new Tecsun AN-48X loop antenna. I have not had much time to thoroughly test it, but I can make one immediate recommendation IMO. Replace the bundled “feedline” between the loop and controller with an actual *shielded* 1/8″ male-to-male stereo audio cable.

The bundled cable causes near-hand capacitance at the controller, potential RFI issues, etc.; at least for my received unit. The noted concerns largely corrected when replacing the bundled cable with a 6′ shielded audio cable. Tuning now works as expected, and SNR seems much improved.

I have longer 12′ shielded cables and some 1/8″ female-to-female couplers on order to eventually try longer feedlines should the need arise. I will try to drop you a line if/when I get around to testing them.

That’s a sound suggestion, Robert! Thanks for sharing!

Assembling the uBITX V6 QRP transceiver

Last Friday, after returning from holiday travel, I found a belated Christmas gift on my doorstep: the new uBITX V6 QRP transceiver.

In the spirit of full disclosure, this package wasn’t delivered by Santa, rather by DHL in record time from India. As I mentioned in a previous post, I simply couldn’t resist purchasing such an affordable general coverage transceiver.

To be clear, the uBITX V6 isn’t really a kit. The boards are all fully populated by a women’s cooperative in India. You can purchase the uBITX V6 for $149 without a chassis and for $199 with a custom metal chassis. I purchased the latter.

Assembly may take thirty to forty minutes following HF Signals’ online guide. I employed my twelve year old daughters who pretty much assembled the entire radio–I only helped seat the display to the main board.

There is no firmware or software to upload. Simply assemble the radio, solder a power cord to the supplied coaxial plug (hint: positive tip polarity), connect an antenna, connect a power supply, and turn it on.

You’re on the air!

So far, I’ve only scanned the bands and listened to QSOs and broadcasters (no AM mode, so I’ve been zero-beating stations in SSB). Today, I hope to chase a few parks via the Parks On The Air program.

I still need to calibrate the radio yet (although it does zero beat WWV perfectly).

If you purchase the uBITX V6, don’t expect a benchmark transceiver. This uBITX V6 feels more like a work-in-progress and I assume the pre-loaded firmware is simply a first iteration.

Since the radio is open source, I expect hams will soon hack this rig to go above and beyond its basic (understatement alert–!) feature set.

If you’re a CW operator, you might hold off on purchasing until someone has properly implemented the mode. I made some test CW CQs into a dummy load just to check out the keyer and I honestly don’t think I could manage a proper QSO at this point. Sending is sluggish and…well…awkward.

Note that I will be writing a full review of the uBITX V6 for a future issue of Radcom (the RSGB’s monthly publication). Check back here for uBITX V6 notes along the way.

Also check out the excellent blog of our friend, John Harper (AE5X), who has also recently put the uBITX V6 on the air!

Anyone else order a uBITX V6? Please comment!


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Alan takes a deeper dive into decibels

Many thanks to SWLing Post contributor, Alan Fahrner, who writes:

One of your articles below inspired me to write this:

https://math.promo/2019/12/shortwave-decibels/

This past August I went back for a second bachelors, this time in mathematics. So, I love when real life can be used as an example of answering the age-old question, “When am I ever going to use this?” about math. 🙂

Happy New Year!

And a Happy New Year to you, too, Alan! Thanks for sharing!

The Global Radio Guide: Winter 2019-2020

Many thanks to SWLing Post contributor, Dan Ervin (KB0RTQ), who writes:

Just in time for the new year, the Winter 2019-2020 edition of the Global Radio Guide is available on Amazon in e-book form for $8.99.

Click here to view on Amazon.com (affiliate link supports the SWLing Post).

I first learned about this guide thanks to you and the SWLing Post, and their content and “Hour by Hour” listening guide reminds me of the old “Passport to World Band Radio” of days gone by.

73, and here’s to a wonderful 2020!

Thank you so much for the tip, Dan! I should mention that the guide also has a substantial introduction section with articles, propagation forecasts, and product reviews.

 

Free Radio Skybird’s last flight of 2019

(Source: Pete Madtone)

OLYMPUS DIGITAL CAMERA

The last transmission of 2019 from DJ Frederick’s Free Radio Skybird will be on Tuesday December 31st at 0900 UTC on 6070 kHz shortwave via Channel 292. The show will be rebroadcast on Sunday 5th January at 1100 UTC/UK on 7440 kHz. If you haven’t got a suitable shortwave set it can also be heard on the SDR link on Channel 292’s site here.

The programme will feature Justin Patrick Moore’s Radiophonic Laboratory and One Deck Pete (from Weeds up to me knees) presenting the Skybird Mailbag. There’ll also be an airing of Pete’s “Nine and a half minutes at ninety BPM” that has new tunes from: FrappBlundettoLama’s Dream and Mario Pinosa Trio. Mixes from previous shows are available at our audio podcast page here.

The programme will be available on DJ Frederick’s Soundcloud page a day or so before transmission date if you want to hear it in true stereo but we here prefer the show via the ionosphere. Tune in and turn on! #shortwavesnotdead #madtone #freeradioskybird

By the way we’re always looking for decent tunes to play on our spot on Free Radio Skybird. If you know of anything “up our street” so to speak, do contact us via the blog or at onedeckpete (at) gmail (dot) com and if we like it we’ll play it. Free Radio Skybird is now available via 5 FM stations in the USA WSCSWMNBKBOGKOWS and WEJP as well as good old shortwave via Channel 292 and the above is the transmission zone when the conditions are good.

Understanding decibels

Many thanks to SWLing Post contributor, Marty, who shares the following article from Nuts and Volts magazine–a primer on decibels:

The “dee-bee” is everywhere in ham radio, and is used for characterizing everything from antenna performance to nano-sized signals. Learn the decibel (abbreviated as lower-case ‘d’ followed by an upper-case ‘B’ or ‘dB’) and you and your signal will go a long way!

From the ARRL Ham Radio License Manual’s online math tutorials for beginning hams (arrl.org/chpt-2-radio-signal-fundamentals), we introduce the decibel. “You have probably recognized deci as the metric prefix that means one-tenth. The unit we are really talking about here is the bel (a ratio of sound levels named for Alexander Graham Bell), so a decibel is just 1/10th of a bel. We use a decibel instead of a whole bel because the bel represents a rather large change in levels. The dB is a just-perceptible change and more useful as a unit of measurement.” As used in wireless, the decibel is the ratio of two power levels:

dB = 10 log10 (P2/P1)

Note that the dB has no units because it is a ratio. The dB is just a number that describes how much bigger or smaller one quantity is compared to the other. Both quantities themselves must have the same base units, though — watts, for example. If P2 is larger than P1, the dB value is positive, such as for amplifier gain. If P2 is less, the value is negative and represents attenuation or loss. (Somewhat confusingly, it’s common to specify an amount of attenuation as a positive value of dB. For example, “This filter attenuates the signal by 20 dB.”)

Click here to read the full article at Nuts and Volts.

Guest Post: Radio Seribatu’s Three FM Stations Launch on January 1st, 2020

Radio Seribatu FM Tower

Many thanks for the following guest post about SWLing Post supporter, Mark Fahey, who will soon be launching three local Balinese radio stations:


Radio Seribatu New Year 2020

A 2018 personal DX-pedition by SWLing Post supporter Mark Fahey to a remote village community in Indonesia’s Bali Province was intended to capture and record local and regional MW and SW Tropical Band spectrum on a WinRadio Excalibur for the Radio Spectrum Archive.

The field trip took a most unexpected turn; It was a total failure. Mark didn’t suffer any equipment problems, the loop antennas performed well; the problem was that MW, SW radio was irrelevant to the local population and there were just no longer any local stations broadcasting to archive.

Mark hanging backstage for Radio Volcano

To salvage the experience, Mark shifted his focus to recording video and audio of local gamelan and soundscapes. Seen as a strange novelty by the local jungle community, Mark was soon allocated land, the village built him a house and he has become the first foreigner to ever become a resident of the district and village.

Radio Seribatu Studio Building Studios are on Lower Levels of the house

In return, he has undertaken a project to introduce, and up-skill the village in sustainable eco-industries and educate the village millennials on how to manage these ventures using digital technologies. A component of the project has seen the establishment of three radio stations broadcasting 100% Balinese content. They are the first 24-hour radio stations in the province.

For the last six months, the three stations, Radio Seribatu – Village; Radio Seribatu – Volcano and Radio Seribatu – Mesin have been building the studio complex, solving power and bandwidth issues and training the staff. The network licensing is now permanently allocated and at midnight on January 1st, the test transmissions finish and the three stations officially open.

Each station brings many firsts to the region. They are the first to broadcasts 24 hours per day in the province, the first to broadcast 100% Balinese content and the first to deploy a fully digital workflow and studio complex.

Radio Seribatu Studio A sports state-of-the-art digital workflow

Late February, Mark is presenting a deep dive of the stations in a presentation at the upcoming NASWA Winter SWL Fest in Philadelphia, and at that time the SWLing Post will present a detailed tour of the network, discuss the journey, how unexpected twists and turns were overcome, and explain how Radio Seribatu’s test broadcasts in less than twelve months have reached the third most listened to radio network in all of Indonesia.

Most (if not all!) SWLing Post readers are beyond Radio Seribatu’s FM footprint; however, the majority of the station’s listeners tune in via their IP web streams and so can you! You will find the stations in most online radio directories, iOS and Android Apps and new generation factory fitted car radios (including Buick, Hyundai, Subaru, Mazda, Chevrolet, VW, BMW, GMC, Ford, Chrysler, Kia, Honda, Audi, Toyota, RAM, etc.).

Radio Seribatu Worldwide on Car Radio

A sure-fire way to listen is via the stream links on their website www.radioseribatu.com

 

On the Radio Seribatu VILLAGE station, you will hear everything that is happening around Seribatu village and wider across the island. This is the place to hear live gamelan, festival broadcasts and discussions about issues affecting the community.

On VOLCANO, the playlist is 100% Balinese Indi Rock, Alternative and Punk. 24 hours per day this is the place to hear Balinese bands.

On MESIN Radio Seribatu is playing 100% Balinese Electronic, Trance, House, Techno and Dance.

Each station’s test transmissions are on air right now and continue up until 6 PM Bali Time on New Year’s Eve, December 31st (1000 UTC December 31st). Then all three stations will be in simulcast, presenting a 6-hour special soundscape/actualities program that allows the listener to experience the tropical sounds of Seribatu. With the stroke of midnight; at the beginning of the new decade, all three stations launch into their regular programming.

Putu and Radio Seribatu_s Scoppy

Radio Seribatu is QSLing anyone who listens in, be it via stream or FM. Simply send a hello note and brief report of reception to [email protected] and in return, you will receive a limited edition QSL, complete with an exotic postage stamp, posted directly from the Balinese jungle. No return postage required!


Here’s a rundown of what you can hear on the 31st December 2019 launch broadcast:

1000 UTC – (6:00 PM Bali Time)

Puja Tri Sandya Prayers

The Trisandya (from Sanskrit ??????????? ??? , Trisandhy? Puja, “three-evening prayer”) is a commonly-used prayer in Balinese Hinduism. It is uttered three times each day: 6 am, noon, and 6 pm, somewhat reflecting the Muslim azan prayers heard in other parts of Indonesia.

1005 UTC – (6:05 PM Bali Time)

Seribatu Village Awakens

Most Balinese families live within a family compound in villages that may have a population of around 700 – 800 people. In Seribatu the family compounds typically contain several homes for different members of the extended family. A typical home compound may comprise up to three families and grow to approximately 30 people. The village stirs to life just before the crack of dawn; roosters crow and chickens are fed. Early morning is a busy time in Seribatu, listen for village drums, Motor Bikes and Scooters heading off to the Dawn Market, Women sweeping their homes with a wicker brush, crickets chirp, and villagers trade at the dawn market. School starts early, and before the heat the day the Indonesian National Anthem is recited.

1017 UTC – (6:17 PM Bali Time)

Balinese Wisdom – The Song of Morality

Please don’t ever think you are very Clever; Let people either say you are good or great.

1019 UTC – (6:19 PM Bali Time)

Morning Market

Simple Seribatu village compounds do not have a refrigerator. Meat, fish and other food are purchased the local central market at dawn and the following few hours before the heat of the day descends. Farmers trade their vegetables and other produce. Merchants sell hardware and household supplies. Minivans packed to the roof with purchased fresh produce maneuver around the narrow lanes of the market.

1044 UTC – (6:44 PM Bali Time)

Ducks in the Rice Fields

Rice is a staple food in Bali, and it has strong ties to the Balinese culture. The cycle of rice growth pretty much sets the tone for much of the traditional Balinese life. The Balinese community views rice as a gift from God and a symbol of life. For thousands of years, the Balinese people have been growing rice and cultivating the beautiful rice terraces of Bali where three kinds of rice are grown: white rice, black rice, and red rice.

1102 UTC – (7:02 PM Bali Time)

Balinese Cleansing Ceremony

This ceremony is intended to cleanse the bhuana alit (the inner world of the individual human being or the micro-cosmos) of negativity so that he/she will be able (again) to enclose and utilize this inner power in an appropriate, spiritual way. The symbolism of this ceremony is intended to remind the individual to guard himself against the selfish desires and actions of the ego in favor of the unselfish goals of the soul or higher self. One prays for a clear mind with positive thinking and for strength to keep one’s self- control in situations where negative emotions are bound to arise.

1114 UTC – (7:14 PM Bali Time)

Satria Bird Market

As a popular Indonesian saying goes, a man is considered to be a real man if he has a house, a wife, a kris (dagger), and a bird. Keeping wild birds as pets is a massively popular hobby in many parts of Indonesia. The better the bird sings, the higher the demand for it. On a visit to Bali’s Satria Bird Market, you will see many thousands of birds from hundreds of species. Many of the birds are caged in poorly maintained conditions. Among the strangest are vendors who keep birds in bags, from unfledged chicks still in nests to breeding adults.

1115 UTC – (7:15 PM Bali Time)

Bats at the Goa Lawah Temple

One of nine sacred temples on the island of Bali, the cave temple of Pura Goa Lawah is home to thousands of bats. If the local legend is to be believed, it also hides a river of healing waters and a titanic snake wearing a crown.

While the site had no name when the temple was built, it gained its name due to the thousands of bats that cling to the ceiling and walls of the natural chasm, “Goa” meaning “cave” and “Lawah” meaning “bat.” It is thought that the cave may extend through the mountain right to a nearby town. The legend goes that the dark recesses of the tunnel are home to a mythical snake king known as Vasuki, a massive naga that wears a crown on his head. He is said to live on the copious amounts of bats in the cavern. Yet another legend claims that a river of miraculous healing waters rushes through the depths of the cave.

1120 UTC – (7:20 PM Bali Time)

Balaganjur Traditional Musicians Rehearsal

Baleganjur music is an inseparable part of life and death in Bali, heard in every village across the island. Its traditional purpose is to accompany funeral processions, so this intensely rhythmic yet dignified ensemble has a permanent role in Balinese society. The musicians play their instruments as they walk, and due to this portability, Baleganjur is now a fixture of all celebratory processions. A standard Baleganjur ensemble consists of about 20 musicians, plus helpers to carry gongs, but these days in Bali bigger is better!

1155 UTC – (7:55 PM Bali Time)

A Brief Balinese Radio Interlude

Listeners phone in and sing, callers discuss the terrorist bombings in Bali, Rinso (Indonesia’s most popular detergent) Soap Powder advertisement and how to cure a stubborn cough.

1242 UTC – (8:42 PM Bali Time)

Subak – Water Irrigation

Subak is a traditional ecologically sustainable irrigation system that binds Balinese agrarian society together within the village’s Bale Banjar community center and Balinese temples. For the Balinese, irrigation is not simply providing water for the plant’s roots, but water is used to construct a complex, pulsed artificial ecosystem. The water management is under the authority of the priests in water temples, who practice Tri Hita Karana Philosophy, a self-described relationship between humans, the earth and the gods.

1255 UTC – (8:50 PM Bali Time)

Temple Ceremony

In Bali, there are over 4,500 temples where ceremonies take place almost every day of the year. Temple festivals are held on the anniversary of when the temple was consecrated and usually on a new or full moon.

An Odalan or temple ceremony usually lasts for three days, but larger ones, which occur every 5, 10, 30 or 100 years, can last for 11 days or longer. The Balinese are honoring the deities that rule over the temple by giving them a myriad of offerings, performances of vocal music, dance and gamelan music. They invite them down from their abode on Mount Agung to partake in the activities. Every ceremony in Bali is to maintain the natural balance of positive to negative, so the Balinese do not destroy the negative forces, but balance them in harmony with the positive.

1426 UTC – (10:26 PM Bali Time)

Seribatu Evening

As the end of the year and the decade approaches, the sounds of frogs, crickets and tropical rain delight the ear while a cool bottle of Bintang refreshes your thirst.

1505 UTC – (11:05 PM Bali Time)

Radio Seribatu Countdown to Launch

Sinaga Goatama’s (Mendira Village) original electronic composition “Blazing Fire” guides us to midnight and the launch of regular programming on all three Radio Seribatu stations.

1600 UTC – (Midnight AM Bali Time)

It’s 2020 and Radio Seribatu has Launched!

All three of Radio Seribatu’s Radio Stations; Village, Volcano and Mesin radio are officially on-air, and commence their regular programming!


Wow, Mark! This is a most impressive endeavor and, no doubt, all three Seribatu stations will have a loyal following in Bali and across the planet! I’ve already become a fan of MESIN! 

We wish you and the Seribatu staff/volunteers massive success in your 2020 launch year!

Post readers: Again, Radio Seribatu, is QSLing anyone who listens in. Send a brief, accurate report and you will receive a limited edition Seribatu QSL. Send all reports to: [email protected]