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Radio receiver ‘listens’ for dark matter particles
Researchers have developed a way to “listen” for the signs of dark matter axions, the particles that may make up dark matter.
Forty years ago, scientists theorized a new kind of low-mass particle that could solve one of the enduring mysteries of nature: what dark matter is made of. Now a new chapter in the search for that particle has begun.
The Axion Dark Matter Experiment (ADMX) is the world’s first and only experiment to have achieved the necessary sensitivity to “hear” the telltale signs of dark matter axions.[…]
Many thanks to SWLing Post contributor, David Iurescia (LW4DAF), who shares the following news from Radio Slovakia International:
RSI addressed by President
On Thursday, RSI celebrated 25 years of its existence at a special event. Besides welcoming the newly appointed Culture Minister ?ubica Laššáková, the Education Minister Martina Lubyová, the US Ambassador Adam Sterling, the Russian Ambassador Alexej Fedotov, other diplomats and representatives of RTVS, the editorial team was also addressed by the Slovak President Andrej Kiska.
At the beginning of his video speech, Andrej Kiska congratulated the team on their 25 years of broadcasting abroad. He underscored the role of public service radio at a time when there is an array of questionable and doubtful sources of information. “A public service radio which is – quite rightly – subject to public control; which verifies the sources of its information. A public radio whose editorial team can be sure of their information.” Said the President, adding that the issue of freedom of speech and its limits is a big subject of debate globally. “But it is also a key factor because … it is not only those of our citizens who may find themselves for a certain time outside Slovakia’s borders, who live or work abroad, who deserve verified and truthful information. Our fellow Slovaks living abroad also deserve it. And in fact everyone who takes an interest in what is happening in Slovakia or Central Europe and wants to find out more deserves it”, concluded Andrej Kiska.
On the occasion of the 25 years since the launch of the independent foreign broadcast by the public Slovak Radio, Radio Slovakia International was also addressed by the Foreign Minister Miroslav Laj?ák: ” 37 years ago, Music TV aired the hit “Video kills the radio stars”. I am very happy today that this black vision has not come true and radio was, is and will be.” The Foreign Minister continued with a remark on the important anniversaries to be remembered in 2018. To the centenary of the former Czechoslovakia, 50 years since the Prague spring and 25 years of an independent Slovak Republic, Miroslav Laj?ák added 25 years of the Slovak Radio foreign service.
According to the the RTVS General Director, Jaroslav Rezník, broadcasting abroad should be part of the fully-fledged portfolio of every public media. Back in 1993, Radio Slovakia International informed about the establishment of the new country, later on about its transformation and success story. Today, RSI represents the primary source of relevant information about Slovakia on the internet, too. In his speech given on the occasion of its 25th birthday, Jaroslav Rezník called RSI the media foreign affairs ministry. “I am very happy that today I can meet people who were at the beginning as well as those who today are preparing broadcasts not only for RSI but also for the Slovak Radio as a proud and patriotic company”, said the current RTVS General Director.
UPDATE (05 November 2018): Please note that we have posted a second production run update to this initial review. In short, C. Crane addressed all of the major issues I noted in the review below. Click here to read the CCRadio-EP Pro update.
Without a doubt, C. Crane Company has become an established name in our radio community as a retailer and manufacturer that focuses on the world of broadcast listening. The company’s ads, website, and blog all promote broadcast listening as a viable and important part of our evolving media landscape. Their radio products are all designed with broadcast listening in mind.
The C. Crane CCRadio 2E
Currently the company manufactures one of the most capable AM broadcast receivers on the market: the CCRadio-2E.
The CCRadio-2E, however, is a pricey portable at $170 US, perhaps overkill for the casual broadcast listener.
So, for those seeking a simpler broadcast receiver, C. Crane later developed the original CCRadio-EP, a bare-bones, fully analog AM/FM radio with a large backlit slide rule dial, designed for the listener who wants to “go old school” in their receiving.
The original CCRadio-EP also attracted mediumwave/AM broadcast radio listeners because it had fairly impressive performance characteristics supported by C. Crane’s patented Twin Coil Ferrite AM antenna. In many ways, the original CCRadio-EP was somewhat reminiscent of the GE Superadio.
Yet while the original CCRadio-EP has––according to C. Crane––been a popular product, because certain vital EP components are now becoming obsolete, the company has been forced to redesign it; hence the new CCRadio-EP Pro.
The CCRadio-EP Pro: A different animal
Let’s be clear, though: unlike its predecessor, the CCRadio-EP Pro is no longer a true analog set.
Despite external similarities, internally this radio and its predecessor are very different receivers. Inside, the EP Pro is based on the Silicon Labs SI4734 DSP chip. Perhaps it goes without saying, but I consider the move to a chip a significant design change.
Crane kindly sent me a review sample of the new CCRadio-EP Pro. It’s important to note that the review unit came from a strictly limited first production run; the actual consumer rig’s first major production run is still a few weeks away. Thus this radio is not yet shipping.
I’ve had the CCRadio-EP Pro for a few weeks now, during which time I’ve given it a thorough evaluation. So, let’s take a close look at the CCRadio-EP Pro––first, in terms of performance.
AM Performance
Let’s face it: if you’re a radio enthusiast and reading this review, you’re likely mainly concerned with the EP Pro’s performance on the AM broadcast band. Personally speaking, that’s true for me, too.
The CCRadio-EP Pro (left) and Tecsun PL-660 (right).
Over the years of reviewing portable receivers of all stripes, I’ve learned that nothing beats a radio specifically designed for AM broadcast band performance. Without a doubt, C. Crane intends that the CCRadio-EP Pro be one of these radios. Indeed, in many ways, it’s an ideal set for broadcast listening, because it sports:
C. Crane’s Twin Coil Ferrite AM antenna
A large speaker
Wide/Narrow bandwidth switch
Dedicated external antenna connections
Although beefy internal AM antennas, large speakers, and external antenna connections were relatively common in the 1970s and 80s, these are rare features among modern AM/FM portable radios. The fact is, radios with superb AM broadcast performance are becoming a rather rare breed.
External antenna connections
In other words, the CCRadio-EP Pro has many design features that position it to be a formidable AM broadcast band receiver.
So, then, how does it perform? Well…that’s complicated to explain. The CCRadio-EP Pro has some positives, but also a notable amount of negatives.
Let’s start with the good news.
Positive: AM Sensitivity
Comparing the CCRadio-EP Pro (left) with the Sony ICF-5500W (right) and the Tecsun PL-660 (middle) at the Pisgah Astronomical Research Institute.
The CCRadio-EP Pro is quite sensitive on the AM broadcast band. When I’ve compared it with a number of shortwave portables I own, it almost always outperforms them on frequency. When my Tecsun PL-660––one of the most sensitive mediumwave receivers among my shortwave portables––is tuned to a marginal signal, it sounds about half as sensitive as the CCRadio-EP Pro.
The noise floor is fairly low while the audio is robust and room-filling via the EP Pro’s front-facing speaker.
Positive: No drifting
As I’ve said above, unlike the original (analog) CCRadio-EP, the EP Pro is a mechanically-tuned DSP radio. In all of my testing, I never noted a time that the radio drifted off frequency.
Positive: Nulling
Crane’s internal Twin Coil Ferrite AM antenna affords the listener excellent gain and nulling capabilities. In fact, I find the nulling quite sharp, a major positive for this listener.
Positive: Fine tuning control
On the right side of the CCRadio-EP Pro you’ll find a large tuning knob (top), the antenna trimmer (middle), and large volume knob (bottom)
Like the original EP, the EP Pro has a Twin Coil Antenna Fine Tuning adjustment.
This feature can help make small adjustments to received station to peak reception. This fine tune control is actually trimming the twin coil ferrite bar.
Positive: Wide/Narrow filter
The EP Pro does have a Wide/Narrow filter selection which essentially helps widen or narrow received audio. Note that this has no meaningful impact on the imaging mentioned below.
Altogether, this about sums up the CCR-EP’s positive performance capabilities on the AM broadcast band.
Now let’s look at the CCR-EP’s negatives, some of which are, unfortunately, significant.
The original CCRadio-EP revives the joy of a purely analog radio set. When you tune up/down the bands, there’s a fluidity to the whole process. While the interface is simple, analog tuning allows your ears to pick up on the nuances––the rise and fall of stations both strong and weak as you travel across the dial.
As we mentioned earlier, mechanically-tuned DSP radios, like the new CCRadio-EP Pro, may look like analog sets, but inside, they’re entirely digital. And one drawback to all of the mechanically-tuned DSP radios I’ve tested so far is a tendency to mute between frequencies. With each 10 kHz frequency step, you’ll hear a short audio mute. If you tune across the dial quickly, audio mutes until you land on a frequency. Here’s a video demonstrating the effect:
Needless to say, muting makes band scanning a more fatiguing process. It’s really a shame this affects the AM band. I hope that C. Crane engineers can minimize this issue in future production runs, but I understand much of this is a characteristic/limitation of this particular DSP chip.
Crane actually includes a note about weak images which you might find below and/or above your target signal. Weak images are an unfortunate reality of the CCRadio-EP Pro; they’re prevalent on both AM and FM.
Here’s how you’ll experience the images by way of example: let’s say you’re tuning to a strong local AM station on 630 kHz, noting that the EP Pro has 10 kHz tuning increments. As you tune to 630 kHz, you’ll hear the station on 620 kHz, though it won’t be as strong as it is on 630 kHz. Then if you tune to 640 kHz, you’ll likely hear a weaker image of the station there, as well. In my experience, images are present on both sides of the target station if the station is strong. If it’s a weak station, you might only hear it, say, 10 kHz lower but not above (or vise versa).
The CCRadio-EP Pro is powered by four D Cells.
As you might imagine, this poses a problem for the weak signal AM broadcast band DXer. Let’s say you’re trying to snag an elusive DX station on 640 kHz; although the EP Pro might have the sensitivity required to grab that station, it’s simply not selective enough (if selective is indeed the right word) to reject the local station on 630 kHz, thus your weak DX will have local competition.
This, more than any other negative, takes the EP Pro out of the realm of the mediumwave DXer.
I’ve also discovered that, on my unit, the top half of the AM dial is inaccurate. I estimate that the slide rule dial is off by about 40-50 kHz at the top end of the band. It’s much more accurate below 1,200 kHz, however.
Here is a few photo of the CCRadio-EP Pro tuned to 1600 kHz:
I hope C. Crane can address this in future iterations of the EP Pro. While I don’t expect slide rule dials to be extremely accurate, there nonetheless needs to be some reliability.
Note: C. Crane engineering is aware of this problem and even attempting to implement a fix on the first production run units. I will follow up when I learn more.
Negative Audio “pop” with power on
As you might have heard in the band scanning video above, any time you turn on the CCRadio-EP Pro, you’ll hear an audio “pop.” This is happening when power is applied to the audio amplifier. The pop is not soft, but fairly audible, and is present even if you turn the volume down all the way. The audio pop is prevalent via both the internal speaker and when using headphones. Fortunately, it’s much less pronounced via headphones. While not a major negative, I find it a bit annoying, and don’t doubt that other listeners will, too.
Note: C. Crane engineering tell me that they’ve minimized the audio pop since making the limited first production run, thus the first full production run should be improved.
Negative: AM frequency steps currently limited to 10 kHz
My initial production run EP Pro is limited to 10 kHz frequency steps. This radio is primarily marketed to North America where 10 kHz increments are standard. Of course, if you’re trying to use the EP Pro to snag Transatlantic or Transpacific DX, you’ll miss the ability to tune between those broad 10 kHz steps. But, again, due to the imaging mention above, I think the CCRadio-EP Pro is simply not suited for DXing.
Note: C. Crane engineering has informed me that future production runs of the CCRadio-EP Pro may have a 10/9 kHz switch, thus eliminating this negative. If you’re reading this review a few months after time of posting––crossed fingers––this may already be resolved.
FM Performance
If you’re looking for a simple AM/FM radio, and plan to spend most of your time on the FM band, you’ll like the CCRadio-EP Pro.
Positive: Audio
FM audio is very good on the CCRadio-EP Pro. I think it would be safe to say that it’s superior to most other receivers currently on the market in its $85 price range. Audio is room-filling and has good characteristics with dedicated adjustments for Bass and Treble. FM audio is reminiscent of 1970s-era solid-state receivers like the GE Superadio (a big positive, in my book). The bass is not very deep and resonant, nor the treble super-crisp, but the sound overall is very pleasant to the ear.
Positive: Sensitivity
The EP Pro is a sensitive FM receiver. It received all of my benchmark local and distant FM stations.
Positive: No drifting
As with AM, the EP Pro does not drift off frequency (again, this is actually a DSP radio).
The FM band is less affected by some of the negatives that impact AM broadcast band listening:
Negative: Inaccurate dial
As with the AM dial, FM frequency markings are slightly off. I measured the entire FM band and found that the upper half of the dial (above 102 MHz) seemed to deviate the most. See images below comparing the Tecsun PL-660 and CCRadio-EP Pro tuned to the same FM frequencies:
Here are a few examples of the CCRadio-EP Pro and Tecsun PL-660 tuned to the same frequencies:
Note: As mentioned above, C. Crane is trying to implement a fix for this in future production runs.
Negative: Imaging
As with the AM band, you will find imaging on the FM band. This bothers me less on the FM band, but I live in an area where the FM dial isn’t incredibly crowded. If you live in an urban market with stations packed into the dial, then the imaging concern will probably make the experience of listening to a weak station adjacent to a strong station quite unpleasant.
What about muting between frequencies? While you can hear frequency steps on the FM band, there is little to no muting between frequencies. It almost feels more like an analog radio.
Funny, but the weak signal images around a strong FM frequency actually help contribute to an analog-like experience during band scanning, as stations seem to rise and fall as you tune.
There is another factor that I don’t really consider a positive, but is worth noting. The EP Pro is one of the best mechanically-tuned DSP receivers to use on the FM band because the slide rule dial is wide––there’s a larger space for the needle to travel. FM band scanning would be a pretty pleasant experience if only the dial markings were more accurate.
Summary
Every radio has its pros and cons. When I begin a review of a radio, I take notes from the very beginning so that I don’t forget some of my initial impressions. Here is the list I formed over the time I’ve spent evaluating the C. Crane CCRadio-EP Pro.
Pros:
Excellent AM sensitivity
Good audio via internal speaker
Internal Twin Coil Ferrite AM antenna provides excellent gain and nulling
My conclusion is that the first production run of the CCradio-EP Pro is simply not an enthusiasts’ radio.
If you read the list of negatives in the AM performance section of this review, you’ll know why I simply can’t recommend it…at least not yet. If C. Crane could minimize AM muting, improve imaging and fix the frequency accuracy, this radio may prove more promising. But at this point, the limited production run CCRadio-EP Pro lacks the level of refinement that I’ve come to expect from a C. Crane radio.
For what it’s worth, I have been in close contact with C. Crane regarding these issues; the company is taking them to heart and even looking to implement some fixes/adjustments prior to their full production run. As these issues are resolved, I’ll amend this review. Click here to read the second production run review.
The lack of refinements is somewhat disheartening. Otherwise, the CCR-EP Pro would be a great mediumwave DXing machine. When on frequency, it’s quite sensitive and stable! Perhaps some mediumwave DXers could overlook the negatives above to take advantage of this. I would not, however. I’d soon find the problems frustrating and turn to other receivers in my arsenal. Sensitivity is important, but personally I would sacrifice sensitivity to have an overall better tuning and listening experience.
On the other hand––as C.Crane makes a point of stating––the CC-Radio EP Pro was designed around the needs of Bob Crane’s mother: so is essentially an effective radio for casual listening that’s utterly simple to use. In this respect, at least, the EP Pro is a success.
The EP Pro has no multi-function buttons, no menus, and no memories. The knobs and buttons are tactile and obvious. The backlit dial is also a nice touch; I love it. The EP Pro is old school design around a modern DSP chip and, in terms of audio, a hat tip to classic solid state analog radios from the 1970s and 80s.
The casual listener––especially those who use radio to primarily listen to their one favorite station––will enjoy the EP Pro. For example, I have an older friend who’s in the process of replacing his bedside radio of 30+ years. He wants a set he can tune to his staple AM broadcast station (which is not a super-easy catch) and leave it on frequency––essentially, he wants a “set it and forget it” radio. I think the EP Pro will work well for this application.
But for radio enthusiasts––like most of you wonderful people who read the SWLing Post––I would pass on the EP Pro and consider a more capable mediumwave radio instead like the original CCRadio-EP, the CC-Radio 2E, or a vintage solid state set like the GE Superadio, Sony-5500W, or the venerable Panasonic RF-2200.
You can purchase the CCRadio-EP Pro from the following retailers:
Art Bell, a radio host best known for a paranormal-themed nightly show syndicated on hundreds of stations in the 1990s, died at his home in southern Nevada, authorities said Saturday.
Nye County Sheriff Sharon Wehrly announced in a Facebook video that Bell died Friday in Pahrump. He was 72. An autopsy will be conducted to determine cause of death, she said.
Bell hosted the popular radio talk show “Coast to Coast AM” before he left the airwaves in 2002. He broadcast the show from his radio station, KNYE, in Pahrump.
The program focused on Bell’s conspiracy theories and his fascination with the paranormal and unexplained phenomenon such as UFOs and crop circles. He served as his own producer, engineer and host, according to the Las Vegas Review-Journal.
Fans, including celebrities like William Shatner and singer Josh Groban, took to Twitter to praise Bell. Groban recalled staying up late to listen to the host’s “one of a kind” voice and how “his shows were so weird & spooky but somehow managed to hold off your skepticism.”
Former business partner Alan Corbeth said during Bell’s 2008 induction into the National Radio Hall of Fame that nobody was better than Bell at understanding “how to create theater of the mind…”[…]
Last week, I picked up the first season DVDs for the TV science fiction series “V” at our local library. I somehow missed this series when it was first produced in 2009–however, I do remember clearly the original 1984 series.
In the second half of the first season, a small group of resistance fighters created a makeshift basement headquarters for their operations. In many of the scenes, the camera would pan over a table with a compter (or laptop) and two radios. Both rigs appear to be transceivers or transmitters. Can anyone ID these sets? Please comment!
The ESA just discovered a second magnetic field surrounding our planet
A trio of satellites studying our planet’s magnetic field have shown details of the steady swell of a magnetic field produced by the ocean’s tides.
Four years of data collected by the European Space Agency’s (ESA) Swarm mission have contributed to the mapping of this ‘other’ magnetic field, one that could help us build better models around global warming.
Physicist Nils Olsen from the Technical University of Denmark presented the surprising results at this year’s European Geosciences Union meeting in Vienna, explaining how his team of researchers managed to detail such a faint signature.
“It’s a really tiny magnetic field,” Olsen told BBC correspondent Jonathan Amos. “It’s about 2 – 2.5 nanotesla at satellite altitude, which is about 20,000 times weaker than Earth’s global magnetic field.”
On a fundamental level, both fields are the result of a dynamo effect produced by charged particles being sloshed around in a fluid.
The stronger magnetic field that tugs on our compass needle forms from the steady movement of molten rock deep under our feet.
This field also leaves its signature in the alignment of particles embedded in Earth’s crust, a pattern that has also been analysed in detail by Swarm
SWLing Post readers: check out this amazing audio documentary by our friend David Goren about the legendary hip hop pirate radio station WBAD. It’s part of a new series from KCRW called Lost Notes.
David shares the following note:
“Endless thanks to DJ Cintronics, and Dren Starr for sharing their stories. Thanks also to Myke Dodge Weiskopf and Nick White of KCRW for their incredible, skillful work and dedication bringing this to fruition.
If by chance you are not a hip hop fan, I would still encourage you to listen to this compelling two person narrative about people who love music and the lengths they go to put it on the air.”
