The concept of transmitting digital information on the same frequency as an AM
audio carrier, as Dr. Kim Andrew Elliott and Thomas Witherspoon, will do at the
Fest rings a vague bell. Someplace I read that KFI, Los Angeles, had a radio
teletype signal superimposed on its carrier by means of frequency shift keying
during World War II. The project was highly classified as the information was
being sent on behalf of the War Department. The frequency shift was small
compared to the 10 kilocycle bandwidth of the channel so an AM receiver would
not detect the frequency deviation unless the receiver had a BFO and the
receiver operator had it turned on which would not be normal for AM audio
reception. KFI had and still has excellent coverage of the Pacific Ocean area.
I have personally heard KFI on the northeast coast of Kauai at 3 in the
afternoon local time in August.
A Google search for this reference failed to turn up anything. Has anyone else
ever heard of this project, and if so, can you supply a reference?
Joe Buch
N2JB
>________________________________
> From: John Figliozzi <[email protected]>
>To: Discussion list for the Winter SWL Fest <[email protected]>
>Sent: Tuesday, February 5, 2013 3:25 PM
>Subject: [Swlfest] Forums Schedule Update!
>
>2013 Winter SWL Fest Forums “Preliminary Final”* Information
>(*I think Rob DeSantos would like that description…)
>
>Here is further information on the scheduling of the forums and other key
>events on Friday, March 1 and Saturday, March 2 at the 2013 Winter SWL Fest.
>Times are EST and in 24 hour format. All forums, except the traditional
>Saturday Night Shortwave Shindig, are timed for one hour. Please be advised
>that this schedule remains subject to change.
>
>Friday, March 1
>
>0830 – Registration and Exhibit Room Open. (Hours of operation to be
>announced.)
>
>0930 – Economically Enhancing Your Collection thru Auctions and Flea Markets
>– Ed Mauger
>
>1100 – From the WBCQ Archives – Larry Will. A combination visual, video and
>audio presentation highlighting the most interesting bits of the history of
>the now legendary independent shortwave station WBCQ “The Planet”, located in
>Monticello, Maine, and it’s hundreds of programmers from the presenter’s point
>of view.
>
>1200 – Lunch on Your Own
>
>1400 – DX’ing With a Dish – Mario Fillippi. Beginning with the basics of
>Free to Air (FTA) Satellite radio and television, this illustrated session
>will cover station setup, programs to be heard, satellites that are out there
>for FTA, data on which satellites are best for international reception, areas
>of the world that can be accessed via FTA, etc., etc., etc.
>
>1530 – Antennas, Batteries and Computers, Oh My! – Tom Swisher. Annually, one
>of our most popular forums, the inestimable (?!) Scanner Scum will continue
>Scanner Basics from last year by delving into effective portable antennas,
>better batteries and interesting ways to use your computer with your scanner.
>
>1630 – Drinks and Dinner (Maybe Dancing? Gosh, We Hope Not!) on Your Own
>
>1900 – Swap Meet
>
>2000 - QRP: How Low Can You Go? – Thomas “Uncle Skip” Arey. International
>shortwave broadcasters use thousands of watts and gigantic high gain antennas
>to move their signals around the world. Hams like Uncle Skip do the same thing
>with 5 watts (or often less) and a random length of wire. Learn about this low
>power (and low cost) way to experiment with HF radio.
>
>2100 – The Friday Night Shortwave Shindig 10th Anniversary – David Goren. Our
>popular, oh-so-relaxed evening-long live listening event, conceived, developed
>and presented by David with a little help from his friends, that features
>archival shortwave sound, live monitoring, and live performance of shortwave
>radio related arts and culture. If you’ve missed out on this in the past,
>don’t lose out this year!
>
>Saturday, March 2
>
>0830 – Registration and Exhibit Room Open
>
>0915 – Sounds from Space: Monitoring and Tracking Satellites Using HF – Dave
>Marthouse. How to monitor the various orbiting satellites that can be found
>throughout the frequency spectrum from hf through the microwaves. These birds
>include weather, navigation, amateur radio, military and more. Monitoring
>these satellites can be done for the most part with simple equipment (even
>hand-held receivers and antennas)!
>
>1015 – Silent Auction Opens
>
>1045 – Digital Text via Shortwave Broadcast - Kim Andrew Elliott/Thomas
>Witherspoon. Unless you’ve been more tightly closeted than usual, you will
>have heard of the weekend tests being conducted on The Mighty KBC
>demonstrating that the digital text modes used by radio amateurs (e.g. PSK31)
>can also be transmitted on analog amplitude-modulated shortwave broadcasts.
>And they can received by an inexpensive shortwave radio, then patched to a
>basic PC for decoding, using free software. Often when shortwave reception
>conditions result in difficult comprehension of voice broadcasts, digital text
>can be received 100%, or nearly so. Digital text via shortwave broadcast can
>fill in when the internet is disrupted by disasters and dictators. Digital
>text might also be effective against jamming. This session will feature
>recorded examples of digital text via shortwave, but the decoding will be done
>live on the PC in the room. (Obviously, plenty can go wrong
here!)
>
>1215 – Luncheon (including In Memoriam and progress updates from Prometheus,
>Ears to Our World and perhaps others.)
>
>1345 – Loop Antennas Reprised and Continued – Jef Eichner. A partial recap of
>last year’s hugely popular program, including some new information and
>experiments, then moving on to broadband loops, relatives of the magnetic
>loop, loop sticks, etc..
>
>1500 – The Annual Pirate Forum – George Zeller leads this merry (or not) band
>of extra-legal radio enthusiasts in a discussion about pertinent (or not)
>events and developments in the past year.
>
>1615 – Silent Auction ends.
>
>1630 – Movie Matinee at Plymouth Meeting.
>
>1830 – Cocktail (Half) Hour
>
>1900 – Banquet (Keynote Speaker tba)
>
>2100 – Raffle
>_______________________________________________
>Swlfest mailing list
>[email protected]
>http://montreal.kotalampi.com/mailman/listinfo/swlfest
>
>To unsubscribe: Send an E-mail to
>[email protected]?subject=unsubscribe, or visit the URL shown
>above.
>
>For more information on the Fest, visit:
>
>http://www.swlfest.com
>http://swlfest.blogspot.com
>
>
>
_______________________________________________
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