Tag Archives: FM

Make a Raspberry Pirate Radio

Sorry, I just couldn't resist the urge to make a pirate graphic.

Sorry, I just couldn’t resist the urge to make a Raspberry Pi-rate graphic.

Many thanks to SWLing Post reader, Paul, for this article on Make Magazine that teaches you how to turn your Raspberry Pi into an FM transmitter. Make Magazine states that this FM transmitter “has enough range to cover your home, DIY drive-in movie, a high school ball game, or even a bike parade (depending on the stragglers).”

What a simple hack:

(If the embedded video above doesn’t appear, simply click here to watch at Makezine.com.)

Raspberry Pi’s are very inexpensive (less than $40 US on Amazon) and a fun tool to have around the shack anyway. I plan to try this project as early as this weekend. I have many hours of shortwave radio recordings that I would love to pipe through the house via FM. I only wish the Raspberry Pi could broadcast in AM. Perhaps one day…

The Tecsun ICR-110 packs AM/FM and digital recording/playback

Photo: BigBargainsOnline from eBay

In a comment, SWLing Post reader Owl mentions:

“Tecsun has just released ICR-110 which is as BIG as the PL-880 and seems to have the same speaker too.”

The ICR-110 can be found on eBay–click here to search. At $46.00 US shipped, I’m very tempted to purchase it. Though it lacks shortwave, it appears that it can record AM (MW) and FM broadcast stations in either MP3 or WAV formats. While I’ve yet to find a radio that can make a digital recording with acceptable fidelity (the CC Witness Plus being a notable exception) I would like to think the engineers at Tecsun have nailed it.

I have a friend who has recently purchased the ICR-110, and am looking forward to his review! (hint, hint)

Review of the RadioShack AM/FM portable digital radio, Model 12-587

The RadioShack Model 12-587 AM/FM Radio

The RadioShack Model 12-587 AM/FM Radio

Three days a week, my father––now in his seventies––takes a three mile walk through his home town, revisiting the neighborhoods of his youth. He began the walks upon retirement, and in my opinion, the routine has helped keep him in great shape. When he first started walking I learned he was carrying around a heavy AM/FM radio with him.  I bought him a bargain one-off Coby AM/FM portable that is not only lightweight but sports a handy neck strap. Dad’s loved it. Indeed––much to my surprise––it’s lasted about ten years, and is still playing, although starting to show signs of wear…

So I decided it was time to test drive a suitable replacement. After searching, I found the RadioShack Model 12-587 AM/FM radio. At a clearance price of $14.99 (US), there will be no loss of sleep if Dad misplaces it or drops it on the pavement.

Still, I couldn’t resist giving it the once-over, and thought I might share the mini review that resulted. As I always say for radios in this price range, my expectations were low.

Here’s a summary of this little AM/FM radio’s pros and cons:

Back of model RadioShack 12-587

Back of model RadioShack 12-587

Pros:

  • Very good FM selectivity and sensitivity
  • Excellent FM stereo lock
  • Scan function both useful and quick
  • 10 AM and 10 FM memories (see con)
  • Large, amber back-lit LCD display
  • Simple control lock switch on right side
  • AM (medium wave) sensitivity adequate
  • AM nulling above average
  • Plastic “blister” packaging very easy to open!

Cons:

  • Tinny sounding audio via built-in speaker
  • Headphone audio lacks high/low; mid-range only
  • Memory allocations supposedly volatile (when batteries are replaced)
  • AM frequency steps fixed at 10 kHz (cannot adapt to 9 kHz steps used in rest of the world)
  • AM (medium wave) sensitivity mediocre at best
  • Complete mute while tuning; not capable of band-scanning
  • Dimple on tuning knob not useful
  • Very sensitive to noise (QRM) on the AM band, resulting in static popping/crackling in audio

Obviously, this is not a radio for the radio hobbyist or world traveler, as it lacks any real medium wave sensitivity and cannot tune in 9 kHz steps. FM tuning is also locked on odd frequencies, thus will not work throughout parts of the world with even spacing. And though the radio is touted as having “extended bass,” the audio is tinny, even via headphones.

RadioShack-Model12-587-AMFMRadio-2BUT.  This is a perfect example of a situation in which, though cons outweigh pros, the RS Model 12-587 is a great match for its intended purpose: my father’s morning walks. Why? It’s a simple-to-operate radio with a large, back-lit display (Dad won’t need to put on his glasses to read it). It receives local AM and FM stations very well. The mid-range audio––while lacking ample fidelity for music––are perfect for the talk shows he listens to while walking. The radio is durable, lightweight, easy to tune, and has a lock feature. It is also remarkably easy to program memories: simply press the program button until preset flashes in the LCD display, use the scan up/down buttons to choose a memory number then press program again.  It’s also very affordable, so no problem to replace as necessary.

In conclusion, the RS Model 12-587 is not a performance radio––and I wouldn’t generally recommend it––but it suits my father’s needs very well.  Like to walk or run? Maybe it’s just what you’re looking for, too.

Newsweek: Can radio turn the tide in Syria?

Syria_(orthographic_projection)Thanks to The Professor for sharing this brilliant article by Mike Giglio in The Daily Beast:

“Twenty minutes—this was the small window of time that Majid (not his real name) usually gave himself to broadcast his radio dispatches and then flee. The Syrian was making a name for himself as a bold, young journalist in Damascus, venturing into contested neighborhoods in the capital’s war-torn suburbs to deliver his reports. The broadcasts were low tech and old-fashioned, produced for an upstart radio station called Al-Watan FM, or “The Homeland FM,” and went out on the local airwaves, crackling into a sphere otherwise tightly controlled by the regime. Any Damascus resident scanning the dial could tune in.

It was dangerous work. Pushing into the capital’s FM frequencies meant transmitting an easy-to-track signal from within the city. Government soldiers or regime thugs often came looking for Majid when he went on the air, so he tried to be quick—setting up, going live, then packing up and disappearing within the span of 20 minutes.”[]

Continue reading the full article in Newsweek’s The Daily Beast online.

Mystery radio identified

Click to enlarge.

Click to enlarge.

Wow, that was quick! Many thanks to Ulli who solved the case of the mystery radio we posted yesterday.

Ulli comments with details:

The radio was a giveaway about 1995.
I opened it :
1 IC Sony CXA1191S 314J22V , 5 Transistors , 3 -band filter , 5.5 cm speakers , 8ohm , 0.5 W.
Today’s AA batteries are a bit too long, the 3 AA not quite fit into the battery tray .
The display with the time can be tilted .
On the back is a sticker :
AM / FM CLOCK RADIO LCD , DC POWER SUPPLY , RADIO DC 4.5 V, 1.5 V DC CLOCK ,
ART No. 05796-07 , CENTRON LABORATORIES LTD .
and on housing :
U.K.REG.NO.2013420 .

Thanks, Ulli!

Bill helps with low-power, license-free broadcasting

HobbyBroadcasterIn reference to our post, Dave’s FM Station Empire, SWLing Post reader Bill writes:

Nice article on the use of low power broadcasting. For the last 5 years my site, HobbyBroadcaster.net, has been helping radio enthusiasts along with schools and businesses learn how to use legal, low power, license-free Part 15 radio for a variety of uses. I created the site due to my involvement with starting a campus-limited high school station and discovering the lack of quality resources available for school-based broadcasters unable to obtain an FCC allocation. With many hobbyists also using this same technology on AM to serve their neighbors with micro radio it only seemed natural to expand the interest to hobbyists, too.

Also, Part 15 regulations allow for some use of the shortwave bands for experimental broadcasting with the most common frequency used by hobbyists being 13.56 MHz.