Category Archives: Mediumwave

India, DRM, and FM white spaces

Digital Radio Receivers – Availability At An Affordable Price

by Yogender Pal (Chairman, DRM India Chapter)

[…]Transmissions in FM band in India, by AIR as well as private broadcasters, are still in analogue mode only. Aware of the advantages of digital radio broadcasting, the Telecom Regulatory Authority of India, the regulator for all the broadcast services too, has recommended to allow private broadcasters to broadcast in the digital white spaces available in the FM band (VHF band II). This recommendation is under consideration of the Ministry of Information and Broadcasting. The Ministry held a meeting on the issue on August 30, 2018. All stakeholders (public and private) were in favor of digital broadcasting in FM band and suggested that the ministry makes public a regulatory policy as soon as possible. Cellphone manufacturers also gave their support provided no additional costs were involved.

A digital receiver is required to receive digital radio broadcasts as analogue receivers cannot decode the digital signals.

One of the welcome features of the current roll-out of DRM digital radio in India has been the early and overwhelming commitment of the car industry. Most of the leading car manufacturers in India have either already incorporated DRM receivers in their cars or are in the process of incorporating them. Hyundai has built-in DRM radios in all its models except one. Maruti Suzuki has also incorporated DRM receivers in 6 models and all their models are soon expected to have built-in DRM receivers. Mahindra has also installed DRM in its TUV model. It is encouraging that the roll-out of DRM equipped cars is growing rapidly. At present the number is understood to have surpassed the 10 lakh mark. Indian car manufacturers are not charging extra from consumers for line-fit DRM radio sets.

In parallel, efforts are being made by a large number of Indian and foreign receiver manufacturers to provide standalone DRM receivers. Communications Systems is the first Indian radio manufacturer to domestically develop and produce a DRM receiver (AV-1401). Inntot Technologies, a young start-up enterprise, has developed a software-based DRM receiver based on a generic processor. This is likely to be much cheaper. GeekSynergy, another start-up company, is also working on the development of a highly affordable DRM receiver.

Gospell Digital Technology located in China has presented a very well-reviewed DRM Receiver, GR216, which is already in production. Gospell is developing a DRM receiver dongle, GR-227 too, which can be plugged in the existing audio systems in the automobiles on USB ports or Aux input to receive DRM digital signals. Titus SDR, a Panamanian based company, has developed a multi-standard and software-based digital radio receiver. Starwaves has also developed a prototype DRM receiver.

Standalone DRM digital efforts remain relatively expensive at present. Like with any new technology higher volumes will bring down the cost of the receivers. AIR may thus offer content with additional audio services, innovative advanced features such as journaline advanced text, emergency warnings, and traffic information so that listeners see value in buying a digital receiver.

An app for DRM digital reception in mobile phones in FM band has been already developed. Demonstrations have been made on the reception of DRM digital signals in the existing mobile phones by plugging a dongle. External dongle would not be required in the new mobile phones; however, the industry wants to see the publicized policy of the government before making the necessary adjustments for working of the app.

Most of the standalone receivers can receive DRM (in addition to analogue) in AM bands; and its software can also be upgraded to receive DRM in FM band. As announced by Director General recently, AIR may start digital radio broadcasting in FM band. Government may also accept TRAI recommendations and announce a roadmap for digital radio broadcasting in FM band by private broadcasters so that the industry (cellphones, automobile, and standalone receiver manufacturers) gets confidence and starts mass production of receivers.[…]

Read the full article at Broadcast and Cable Sat online.

Many thanks to Ed for the tip!

Fred Jacobs on “Rekindling Our Fading Romance With AM Radio”

8 Replies

Many thanks to SWLing Post contributor, Dennis Dura, who shares the following article which appeared in Jacob’s Media Strategies on Dec 31, 2018. I’ve pasted an excerpt below, but you’ll want to read the entire piece by clicking here:

Rekindling Our Fading Romance With AM Radio

I know I may sound like a relic from another era, but chances are if you’re a Baby Boomer (or gasp – even older), you were inspired by AM radio as a kid growing up whether it was in a big city or a small town. If you’re a member of a younger generation, you may not even know that AM – or amplitude modulation – has a magic power. At night when the clouds are just right, AM signals have the ability to “skip” across geography, unlike frequency modulation (FM) which is line of sight. “Clear channel” stations had an even easier time being heard beyond their metro confines – often covering many states during the nighttime hours.

Many of us radio veterans remember those nights, lying in bed, where your trusty bedside AM clock radio pulled in signals from all over the U.S. As a boy in Detroit and not especially well-traveled, I learned how to pronounced Des Plaines (Des-planes) and Touhy (2E) by listening to Chicago radio stations like WBBM and WLS. Tuning in KYW in Philly (which came in “like it was next door”), I learned how to spell the quirky town of Conshohocken from listening to Phillips Ford commercials. It was from a jingle that got in your head (CON-SHO-HO-CKEN). At least, it got in mine.

It didn’t matter if you lived in Dallas or Des Moines, or a small town in Delaware – you were able to pick up big AM radio stations from faraway. And if you talk to today’s broadcasters on the other side of 50, many will tell you their careers were likely inspired by these booming, exciting blowtorches on AM radio that provided a soundtrack for our teens.

AM radio was where we first heard the Beatles, the Supremes, the Stones, Stevie Wonder, and even the Doors. Big AM Top 40 stations of the day – KHJ, WABC, CKLW, WLS – played all these cool rock songs, right next to Herb Alpert & the Tijuana Brass, Elvis, Bobby “Boris” Pickett, and the Singing Nun. And even though the fidelity of amplitude modulation is obviously technically inferior to that of FM, there was something very different and even romantic about hearing all those songs first on AM radio.[…]

Continue reading the full piece at Jacob’s Media Strategies.

Thanks for the tip, Dennis! I think this piece speaks to so many of us radio listeners–especially this one who prefers the “fidelity of amplitude modulation” over so many other mediums.

AM receiver design with regards to IBOC bandwidth claims

5 Replies

Many thanks to SWLing Post contributor, Emilio Ruiz, who writes:

Hi Thomas,

I’m writing because found this (interesting) analysis about radio
components and the impact on radio receiver quality:

http://www.geocities.ws/shreddermanrulz/myth1.htm

I think may be are interesting topic for readers of the SWLing Post.

This is interesting, Emilio. Thank you for sharing. Although the reason the author put together this post was to refute IBOC’s claims about testing AM receivers, it is also a fascinating look into cheap AM radio/receiver design. Thank you for sharing!

Guest Post: A visit to Tokyo’s Akihabara district

10 Replies

Many thanks to SWLing Post contributor and word traveler, Chris Johnson, who shares the following:

This past year while traveling for business in Japan I decided to explore a district within the city limits of Tokyo known as Akihabara or better known to locals as the “Electronics District”.

After jumping off the train I found my senses bombarded by a cacophony of sounds and enough neon from the street to the sky to put your senses into overload. The streets were crowded and the stores were filled with every modern electronic device known to man.

Click here to watch video.

My imagination ran wild, I started wondering what this place would have been like in the 1970’s when some of the most cutting edge electronics were CB radios or shortwave receivers, the different brands, models etc… Perhaps some of that still existed here so I started wandering the streets and found more of the same you would find in a big box store but multiplied by 10, overwhelming.

Just when I was ready to give up the search I turned the corner down a side street and discovered a red awning with “Tokyo Radio Department Store” emblazoned on it, I felt like I discovered a lost treasure amongst the modernity.

I walked through the main entrance and was immediately drawn down a maze of narrow corridors that were staffed with small stores and stalls that sold electronic parts both popular and obscure, it was incredible. That was just the first floor with 3 more above to discover, I thought to myself if I ever wanted to build a transmitter this is the one place in the world where you could shop and find all the parts you need.

As I ventured up the narrow stairs to the floors above once again I felt like I found a treasure of gold, before me were shelves and displays crammed full of radios, some I haven’t seen in many years and some from the recent past .

This was like a Hamfest and eBay together under one roof. Truly incredible as you will see in the pictures below. I couldn’t get close to some of the ones wrapped in plastic but maybe a sharp eyed enthusiast can Identify them. I highly recommend anyone traveling to this part of Asia to check out this hidden gem you will not be disappointed.

Thank you so much for sharing this photo tour, Chris! I mean…WOW! There are so many radio gems here. I see some classic solid-state receivers, ham radio transceivers and even valve gear I’ve never seen before. Amazing!

Thank you for taking the time to share your tour of the Akihabara district of Tokyo!

Post readers: Please comment if you’ve ever visited the Akihabara district or any other “Radio Row” districts in the world. please consider sharing your photos!

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Any reviews of the JINSERTA Mini portable radio?

8 Replies

Many thanks to SWLing Post contributor, Marc Thomas, who writes:

I was wondering if anyone has tried this $40 receiver that seems to have an exceptionally broad frequency coverage:

SW: 2-30MHZ, 5KHZ STEP
AM: 520-1720, 9K/10K STEP SEL
FM: 87.5-108MHZ, 0.1MHZ STEP
AIR: 118-138MHZ, 5K/50K STEP SEL
VHF: 30-223MHZ, FM-N/FM-W
CB: 25-28MHZ, 5KHZ STEP

Links to several sellers:

AliExpress here or here

eBay.com

Amazon.com

Link to the manual on this page:
http://www.beliteaircraftstore.com/radiant-pocket-radio-receiver/

Not sure I like the proprietary looking battery.

Thanks.

I am not familiar with this radio, Marc, other than I can see the physical similarities with the Eton Mini. The Eton Mini, however, does not have the VHF coverage of this radio.

Post readers: Is anyone familiar with the JINSERTA Mini? If so, please comment!

75 years ago today: “Christmas Eve at the Front,” a ground-breaking global broadcast

8 Replies

How would Christmas Eve at the Front have sounded on a radio back in 1943? Something like this…

Christmas Eve, 1943: America’s third in WWII.

On this day, exactly three-quarters of a century ago, America tuned into a special live broadcast that would not only engage American listeners, but also every major network in the US at the time: CBS, NBC, and Mutual Broadcasting Company. The simulcast program, “Christmas at the Home Front,” starred troop entertainment veterans Bob Hope and Bing Crosby, as well as numerous others including screen actor Lionel Barrymore–also well-known for his regular portrayal of the miserly Scrooge in NBC’s annual radio drama “A Christmas Carol”–and featured an address by then-President Franklin D. Roosevelt.

This broadcast also included live audio feeds from North Africa, Italy, New Guinea, Guadalcanal, New Caledonia, China, India, Panama, Alaska, Pearl Harbor and even Navy ships in undisclosed locations. Keep in mind, this was 1943. These audio feeds weren’t carried over the Internet or a satellite network, they were shortwave radio signals from remote sites–signals that were bounced off of the ionosphere and back to the studios where they were incorporated in a live radio show. No doubt, this holiday special required months of planning to orchestrate and perhaps even a leap of faith to execute.

Being something of a WWII radio buff, I’ve listened to this recording a few times in the past. And after receiving Bill’s message about it recently, I listened again; the audio obviously came from a recording at NBC studios, very pristine considering the recording’s age and the number of times it’s likely been copied or changed formats, but also with demarcated track switches, not exactly as it would have sounded on the air at the time.

Radio broadcast with entertainer Bob Hope, 1943. Source: Broadcasting and Recorded Sound Division, Library of Congress

So I did what any self-respecting radio geek would do: I fed the recording into an AM transmitter to recreate the sound as it might have played on American radios of the time, and made an off-air recording of the entire broadcast.

Hopefully now, with the help of this recording, you may be able to imagine what families on Christmas Eve in 1943, huddled around their radios, might have experienced as they strove to feel a little closer to loved ones serving in the war, while enjoying a little light entertainment and absorbing the latest message from their president.

But it’s also meaningful to note that times have certainly changed since 1943. Without a doubt, it’s often easy to be lulled into a nostalgic appreciation of that time, and former times generally, made all the rosier by the present knowledge that the outcome of the war was, in many respects, favorable to us. But those who know history know the truth: that war is hard, that our struggles both here and abroad were real, and that people died–as many as 85 million. When the drama was over, the fallen did not rise again to play in another film; they were gone, forever. This is the grim shadow that lies beneath the warmth of entertainment broadcasts like this one.

Fortunately, our civilization continues, and will always view the war and the political circumstances surrounding it through the fading glass of advancing time and hear it through the crackle of increasing distance. And fortunately, our then-enemies are now among our strongest allies. We have a diverse and international audience here at the SWLing Post, so I hope this recording is recognized for what it is: simply a moment in entertainment history that the passing of time allows us to enjoy, during a war the likes of which we hope never again casts such a shadow over us. One such was enough.

Now sit back, close your eyes, and set your time machine’s dial back to Christmas Eve, 1943…

Imagine you’ve just turned on the family console radio, the frequency dial gradually warming with its familiar glow, and have tuned to your local NBC station; soon, the voices of well-known entertainers begin to fill the parlor and the rest of the household, their tasks or play momentarily abandoned, quietly join you there to listen…

Click here to download this recording.

Many thanks to SWLing Post contributor, Bill Hemphill, who reminded me of this show recently when he shared this excellent feature article from the American Legion website.

Quick Look: the RADIWOW R-108, a new DSP shortwave portable

38 Replies

Last week, I received a new portable shortwave radio by the post from China: the Radiwow R-108.

The brand, Radiwow, was new to me, but I suspect they’re linked in some way to the folks behind XHDATA. They contacted me around the Thanksgiving holiday and inquired about evaluating this new portable receiver. I replied, asking a few questions about the unit–you see, I don’t typically agree to take a look at a new product if I think it could simply be a re-badged version of something currently on the market.

Their reply was simple:

“Yes, it is shortwave radio, like PL-310ET radio but add air band, and better reception performance. Your tracking number is…”

So evidently, it was already on the way.

Radiwow claims the performance is better than that of the venerable Tecsun PL-310ET. This, I will have to test because the PL-310ET is certainly a workhorse Ultralight radio. And the R-108 includes air band? Sounds like a CC Skywave without weather radio. That could be quite appealing if the price is competitive.

And it seems this little radio fits neatly into the requirements of Ultralight DXing, thus I hope Gary DeBock and Guy Atkins might take a look as well.

In addition, the R-108 includes longwave frequencies. Something I know will please a number of our readers.

Here are some of the key points I gleamed from a digital copy of the owner’s manual:

Radiwow R108 Features:

Frequency range:
- Longwave: 150-450 kHz)
- Mediumwave/AM: 520-1710 kHz w/10 kHz steps, 522-1620 kHz w/9kHz steps
- Shortwave: 1711-29,999 kHz
- FM: 87.5-108 and 64-108 MHz
- AIR: 118-137 MHz
ATS memory scans on all bands
500 available preset memories
Squelch control
Direct keypad entry of frequencies
Clock function with sleep timer, snooze and alarm (buzzer or radio)
Keylock
FM stereo
AM bandwidths: 6, 4, 3, 2, and 1 kHz selections
Music/Voice audio modes
Built-in intelligent charger for included 3.7V 1500 mAh Li-ion battery pack

By the way, I suspect Radiwow is linked to XHDATA because 1.) they knew my shipping address without asking and 2.) their website prominently features the XHDATA D-808.

In addition, the only other place I could find the R-108 listed on the Internet is via AliExpress. As with the introduction of the XHDATA D-808, the AliExress price is (today) absurdly high. To me, this indicates that the page is simply a placeholder until the first production run is ready to ship.

I have a PL-310ET and you can count on me to compare the two sometime after the holidays.

In the meantime, I thought I’d share a few photos of the unit.

I must admit, the front panel of the radio looks familiar, but perhaps only because most other DSP portables have a similar layout. Please comment if you know of an identical portable.

Follow the tag Radiwow R-108 for updates.