Category Archives: Digital Modes

All-digital AM HD: WWFD’s experiment is attracting attention

(Source: InsideRadio via Ulis K3LU)

All-Digital AM Grabs Automakers’ Interest.

The fate of AM radio in the car dashboard may pass through Frederick, MD. That’s where the latest experiment on an all-digital AM signal is taking place, on Hubbard Radio’s adult alternative “The Gamut” WWFD (820). The project, in conjunction with digital radio developer Xperi and the National Association of Broadcasters’ PILOT program, is already generating interest from carmakers in the U.S and around the world.

The Federal Communications Commission in July approved a proposal to allow WWFD to turn off its analog signal for the next year while remaining an all-digital operation. The aim is to use the real-world environment to conduct experiments designed to improve the all-digital AM service.

WWFD has 4,300-watts day (non-directional) and 430-watts night (directional) and the company proposes to operate with roughly the same output when it goes digital-only, 24-hours a day. Dave Kolesar, Hubbard’s senior engineer overseeing the project, said it’s an ideal station to use for a test case since it’s non-directional by day and directional at night.[…]

The switch has already been flipped and Xperi senior manager of broadcast technologies Mike Raide said preliminary results are encouraging. “We haven’t had any problems with OEM receivers,” he said, noting he drove 70 miles from the transmitter site and still picked up WWFD without any problem. In fact, one DX listener in the Pittsburgh area, roughly 300 miles away, said they were able to hear the station during the daytime. “That’s a testament to how robust all-digital is,” Raide said.[…]

“At a time when we’re all hearing rumors about car manufacturers cutting AM from their factory offerings, something like this could come along and show the auto manufacturers that AM still matters and AM has a digital solution as well,” Kolesar said.[…]

Click here to view the full article at InsideRadio.

In August, I received a strong lock on WWFD in neighboring West Virginia via my car’s built-in HD receiver. The next day, I made this short video of my reception on the Sangean HDR-14 (read review here) in neighboring Germantown, Maryland:

I found that WWFD covered the DC metro area quite well.

Post readers: Do you believe, as this article implies, that AM HD could revitalize the band?

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“Slow Scan Radio” is a new digital program on Channel 292

(Source: Southgate ARC via Mike Hansgen)

New Datamodes programme on BC bands

Starting on Wednesday 25th of July 2018 at 1830 UTC, there will be a new 30 minute programme featuring various datamodes, such as SSTV and some of the more complex and interesting PSK modes.

The programme is called ‘SLOW SCAN RADIO’, and will go out on 6070 kHz AM via the transmitter of German based relay station Channel 292, and should be audible throughout many parts of Europe.

http://www.channel292.de/schedule-for-bookings/

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Bill tunes to WWFD in AM HD

Many thanks to SWLing Post contributor, Bill Mead, who writes:

Thomas, I’m sending you a short clip from WWFD 820 kHz in Frederick, MD. It’s America’s only all-digital station, apparently. They are HD only with a relatively eclectic music format. I’m hearing them at my QTH in Harrisburg, PA, about 80 miles or so north of their transmitter which is 4.3 Kw daytime. I sort of doubt they’ll come in at night when they drop down to 430 watts, but who knows.

My experience with HD on MW is that it can be heard at pretty decent distances under ideal conditions but the slightest bit of interference, a lightning strike or someone switching on the lights for example, and it’ll lose the HD lock.

My HD receiver is a Sony XDR-F1HD. It’s well-known as an excellent FM DX machine. What’s not as well-publicized is that it’s a very decent MW receiver as well. All it needs is a good MW loop antenna directly connected to the AM ANT terminals on the back of the radio.

Click here to view on YouTube.

Excellent!  Thanks for sharing, Bill. I’m passing by Frederick, MD in a couple of weeks and plan to tune to WWFD in both my car and with the Sangean HDR-14.

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Lilian decodes SSTV images from International Space Station

Many thanks to SWLing Post contributor, Lilian Putin?, who writes:

Greetings, my name is Lilian Putina and I am from Moldova. I’ve been following your blog for a long time, with the help of it I’ve purchased a short wave radio, SDR, and WRTH almanac.
I take everything a little bit: shortwave, FM DX, weather images from meteorological satellites, decoding of NAVTEX, WSPR and FT-8 etc.

I’m sending you two SSTV images received from ISS on June 30, 2018.

Many thanks, Lilian!  I’m also very pleased that you’re enjoying all aspects of radio–to me, that’s what makes this all so very fun!

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Al decodes SSTV image from International Space Station

Many thanks to SWLing Post contributor, Al Holt, who shares the decoded SSTV image above via Twitter and notes:

A two-fer, excellent!! Here’s what I caught during its pass over Florida @ ~0914z, a 3-star pass. Had my HT on freq. but dropped it on the floor and got a burp which produced the break in the upper 1/3 of the image…Doh! -73

Ha ha! Thanks for sharing, Al! Based on such a short gap in the image, you must have recovered that HT rather quickly!

Post readers: Has anyone else decoded SSTV during an ISS pass?

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