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Noted DXer and South American radio enthusiast Don Moore (USA) is travelling again and posting fascinating photos & commentary of DXing and life in Colombia.
Don mentions:
The focus is MW. My postings include photos and local recordings of stations from southernmost Colombia including the cities of Pasto and Popayan. I’m currently in Cali (the third largest city) for two weeks. I’ll also get a complete band scan completed in the next few days.
His current journal entries, photos, and DX clips are on his web site.
Be sure and check out Don’s extensive coverage of the Central and South American radio scene, and coverage of his previous travels at http://www.pateplumaradio.com
Guy Atkins is a Sr. Graphic Designer for T-Mobile and lives near Seattle, Washington. He’s a regular contributor to the SWLing Post.
It’s often insightful to look to the past to fully appreciate the current technology we take for granted.
When we tap a favorite contact’s name in our mobile phone–even for someone on the other side of the world–we can be talking to them within seconds, with clarity that’s often the equal of visiting face-to-face. Perhaps Skype or FaceTime is more your style? Yawn… just another two-way, real-time video session. The fact that the other person is thousands of miles away no longer makes you pause at the wonder of it all. Continue reading →
Many thanks to SWLing Post contributor and noted DXer, Guy Atkins, for the following guest post:
Wellbrook 1530LNPro vs ALA1530S+ Imperium Loop Antennas
-Guy Atkins
This past weekend I found some interesting results from medium wave DXing with both models of Wellbrook Imperium loop antennas at the “fabled” Rockworks cliffs near Manzanita, Oregon USA. This location has become popular the last few years with Oregon, Washington, and British Columbia DXers due to the signal enhancement at this narrow strip of land approx. 450 feet above the Pacific ocean. The main benefit seems to be splatter reduction of “pest” stations due to the signal blockage of the rock walls blasted into the cliffs for the coastal highway 101. However, a boost of signals around local sunrise is also beneficial, and is a common occurrence near salt water beaches.
Because of the limited space along this scenic coastal highway, all antennas used for DXing need to be both compact and temporary. Wellbrook loops supported on pro-audio speaker stands are a great way to go, and can easily be set up in the pre-dawn darkness.
Comparison
Both Wellbrook loop antennas mounted on “pro-audio” tripod stands right at the cliff edge at Rockworks Cliffs. (Photo: Guy Atkins)
This is a comparison file of weak signal reception with the two models of Wellbrook Communications “Imperium” series loop antennas: the ALA1530LN “Pro” Imperium and the ALA1530S+ Imperium.
Both models of compact, 1-meter dia. active loops are excellent for reception from longwave & medium wave upwards. However, the ALA1530LN “Pro” excels at LW & MW with its low overall noise level and 9dB higher gain, engineered by Wellbrook for improved signal-to-noise ratio (S/N) of up to 10 dB. S/N on the HF bands is reportedly better also.
My laptop running HDSDR software in my SUV; the receiver is an Elad FDM-S2. (Photo: Guy Atkins)
On the weekend of October 24th, 2015 I was DXing at the “Rockworks” cliffs on the Oregon coast near Manzanita, OR. Both of these Imperium series antennas were in use and I was recording the medium wave band with an Elad FDM-S2 SDR receiver. Both antennas were fed with identical 25 ft. lengths of RG-58 coaxial cable.
The demonstration in this video begins with 10 seconds using the ALA1530LN Pro Imperium loop, alternating with 10 seconds with the ALA1530S+ Imperium loop.
The first signal tuned is aviation voice beacon “SQM” from Level Island, Alaska on 529 kHz (400 watts). The signal is weak, but audible as it rises above the noise floor. The reception improvement with the ALA1530LN Pro is evident.
Half way through the recording the frequency is switched to 1710 kHz, where an unidentified station (possibly a MW pirate) is audible playing the 1967 Zombies tune “Time of the Season”. Again, the clip starts with 10 seconds with the ALA1530LN Pro alternating with 10 seconds of the ALA1530S+ Imperium.
Each antenna is a worthy, compact loop for DXing, but for chasing the weakest signals with the best readability I think the ALA1530LN Pro shows its advantages.
Many thanks, Guy, for sharing your loop research!
What I love about your portable SDR set-up, is that you can go to the cliff side, set up your antennas and equipment, record the spectrum on your SDR, then go back home to analyze and listen to what you captured. It takes some of the pressure off while you’re on-site.
This year at the Dayton Hamvention, I purchased the Pixel Technologies RF PRO-1B mag loop antenna. I used it (for the first time) at the PARI DXpedition. We were all impressed with its performance. I would love to compare it with the ALA1530LN Pro at some point in the future.
My “bargain bin” $13.99 portable Basbon DSP receiver arrived yesterday from China while I was out of town. That was fortunate for the little radio, as my absence allowed it another day of life (in one piece) on planet earth.
The good: the radio’s case is surprisingly solid and of good quality. To hold the receiver you’d think you had a $50+ portable in your hands. The smallish and very basic LCD display (cleverly labeled “DISPLAY” for those who don’t catch on too quickly) looks crude however, and gives forewarning that crude performance awaits.
The so-so: strong, local FM signals sound intelligible but with lots of tinny audio and some distortion. Strong AM signals (which happen to be near or coincide with North America’s 10 KHz channel spacing) are adequate.
The bad & ugly: Once you get past the puzzling multiple button presses to get past the clock display into shortwave operation, the noises and hisses coming from the speaker will make you wish you’d left well enough alone! Strong SW signals audible on Kaito’s $17.99 low-end (and analog) WRX-911 are simply a noisy, tone-covered mess on the Basbon receiver.
I was curious if the digital hash and noise was the result of an unshielded DSP chip, so I opened up the receiver. These two pictures show both sides of the primitive PCB:
After removal of TEN (!) little silver screws holding the PCB board in place I could remove and flip it over. The square, multi-lead chip to the lower left of the LCD display is unmarked, and is presumably the DSP IC. I was contemplating making a small grounded metal shield to cover the chip, but as I moved the Basbon radio’s internals on my workbench the array of case buttons literally fell apart.
That’s the end of THAT idea! I have more interesting radio projects to spend my time on.
Thanks so much, Guy! While I’m a little sad the Basbon DSP radio performed so poorly, at $13 I suppose we can’t be terribly surprised. My Basbon DS-858 is yet to arrive–it took the seller 10 days to ship it and now it’s on the ePacket journey from China. Once received, my expectations will be adjusted accordingly.
In truth, like Guy, I often jump on radio deals like this in the off chance they may perform well for their price. Most of the time, though, I feel like I’m taking a bullet for SWLing Post readers–! (Ha ha!) Giving an honest assessment of a poor radio keeps anyone else from wasting their money.
Many thanks, Guy, for digging into the Basbon and for sharing your review with us!
I spotted this new listing on Ebay today, and was wondering if it’s a new model, or perhaps a repackaged Tecsun PL-606? It’s lacking the rotary tuning knob and has a smaller display than the 606 however. It also has two rows of main buttons rather than three:
Curiously, the seller doesn’t even list the brand name in their auction title; it’s only noted in the pictures. However, “Basbon” isn’t exactly a brand of communications receivers with a long, proud tradition :^)
For $13.99 including shipping the the USA it’s hard to go wrong, so I’ve ordered one.
[…]Three features that caught my eye with the little Basbon radio are that it’s DSP based, it has LCD backlighting, and shortwave frequency coverage down to 3200 kHz. There are 20 memories and a sturdy-looking whip antenna that rotates 360 degrees, too.
I can’t wait to get ahold of this and open it up! I wonder which SiLabs chip it uses?
Thanks for the tip, Guy! I’m also very curious about this little portable–indeed, curious enough, I purchased one, too. Guy and I will compare notes and I’ll post an update after I receive the radio. It’s being shipped via ePacket from China, so transit time will be roughly two weeks if not held up in customs.
Frankly, my expectations are very low, but like Guy, it’s a little too tempting at $13.99 shipped!
Many thanks to SWLing Post contributor, Guy Atkins, for the following guest post:
Radio Cook Islands
by Guy Atkins
A view from the driveway entrance to the Radio Cook Islands studio in 1993. Insulators on an antenna (T2FD or multiband dipole) can be seen as dark spots against the cloudy sky. A feedline is also seen rising above the left side of the building. (Photo: Guy Atkins)
(Photo: Universal Radio)
In 1993 I was fortunate to have the opportunity to visit Rarotonga with my wife, courtesy of a nice award through my company which afforded me an all-expenses-paid trip anywhere we’d like to go.
I chose the South Pacific island of Rarotonga, partly because I wanted to visit Radio Cook Islands after listening to their “island music” on 11760 and 15170 kHz through my teenage years.
During our visit to the island I recorded 90+ minutes of RCI on 630 kHz with a local quality signal using a Grundig Satellit 500 and a Marantz PMD-221 recorder.
Recordings
The programming of Radio Cook Islands is bilingual, and announcers are fluent in both English and Cook Islands Maori. Music selections on RCI encompass all styles, to appeal to many age groups. These recordings was scheduled to include as much local music as possible.
RCI programming includes all the hallmarks of a small, non-professional station: stuck records & tape carts, dead air, poor modulation, and other miscues.
However, that’s part of the flavor of local radio, and these errors are heard throughout this recording. Particularly noticeable is the bassy, over-modulation of the studio announcer during sign-on announcements.
Notes: “Party Time” music request show; weather; local ads; more music.
Two engineers from Radio Cook Islands, photographed during my visit in April, 1993. (Photo: Guy Atkins)
Sadly, RCI will likely never be on shortwave again; a fire in the local tele-comm building a few months before my 1993 visit destroyed RCI’s transmitter. I had an amusing exchange with the secretary when I visited; she insisted that their station was still on shortwave. Of COURSE we’re on the air she said, because “the frequencies are published right here in the newspaper!” The engineer and announcer confirmed, though, that the silence on their former frequencies was for real. They indicated they were covering the outer islands just fine with FM translators and had no intention of restarting shortwave.
Radio Cook Islands 630 kHz antenna on the school ground of Takitumu Primary School.
RCI’s headquarters is in downtown Avarua, and their 5 kw transmitter (reported at half power, 2.5 kw in Dec. 2012) and modern quarter-wavelength vertical antenna is located in the town of Matavera (northeast side of Rarotonga).
Bing.com maps view of Radio Cook Islands antenna, 630 kHz at Takitumu Primary School, Matavera.
The antenna is in the yard of Takitumu primary school; see photos from Bing Maps and Panaromio [above].
It sure brings back a flood of good memories when I listen to these MP3s! I’d love to visit the Cooks again sometime.
Many thanks for this wonderful stroll down memory lane, Guy–radio nostalgia at its best!
I, too, would love to visit the Cook Islands someday–it is on my bucket list. In the meantime, I’ll enjoy your recordings. Again, many thanks for your guest post!
I’m writing to let you know of a “nostalgia radio” Windows wallpaper graphic I’ve made available to radio hobbyists. This design is called Hertzian Vision, and I created it three years ago for a few SDR enthusiasts/software authors in Finland. I’d like to offer it to your readers too.
My design was inspired by the SPARK Museum of Electrical Invention in Bellingham, Washington, which opened initially as a showcase for antique radios.
Here is a link to a folder with two sizes of the wallpaper:
[Update: if you have difficulty downloading the wallpaper via the link above, you can download them directly from the SWLing Post server by clicking here and here.]
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