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From: Interesting Engineering
What do you do when you need to communicate with a crew of 50 sailors submerged in a submarine in an undisclosed location across the world’s oceans? That was a difficult question to answer for Navy leaders in WWII.
Radio waves don’t easily travel through saltwater, which meant that getting active communication with a submarine crew meant making the submarine surface an antenna. This was the obvious solution, but it made a previously covert submarine now a visible target.
The solution to the problem
Engineers tasked with finding a more covert solution soon discovered that radio waves with low frequencies, around 10 kHz, could penetrate saltwater to depths up to around 20 meters. They realized that if the transponders on submarines were switched to these frequency ranges, then they communicate with leadership on land.
The problem with this idea was that creating and broadcasting these low-frequency radio waves required massive antennas. Essentially, the lower the frequency of a radio wave, the longer and larger the antenna is required to be
Engineers honed in on a range of frequencies lower than 30 kHz for submarine communication. The wavelength of these frequencies were roughly 10 kilometers or more, meaning that engineers would need massive antennas. The only way to produce these frequencies with such a high range was to use a massive system of antennas with massive amounts of power.
Nazi engineers seeking to communicate with their fleet of U-boats designed the Goliath antenna network in Saxony-Anhalt, Germany. After construction, it was operated during World War II and had a transmission power of up to 1,000 kilowatts. For comparison, that’s equivalent to the power draw of 500 average American households.
The Goliath Radio Transmitter
The Goliath network would regularly transmit frequencies between 15 kHz and 25 kHz. It was powerful enough to reach any German submarine located anywhere in the world submerged up 20 meters. The only time communication was hindered was when German U-boats were navigating deep Norwegian fjords.
Are you board yet? Sick of the family already? Cabin fever already setting in? Get on the radio on most nights Steel City members can be found on our club hang out frequencies of 28.495 Mhz.USB. Let ham radio warm up your soul…
A special event to mark Maine’s bicentennial will take place during Statehood Week, March 16 – 21, with the on-air event extending to March 22. Volunteers around the state will be on the air with special event call signs from the nine counties that existed in 1820, when Maine became independent of Massachusetts: W1C (Cumberland); W1H Hancock; W1K Kennebec; W1L Lincoln; W1O Oxford; W1P Penobscot; W1S Somerset; W1W Washington, and W1Y York.
Three other special event stations will be K1J Jameson Tavern in Freeport; K1P Portland, and K1B Boston, in recognition of their contributions to Maine’s Statehood.
CW, SSB, and digital operation will be continuous on HF, VHF, and UHF for the duration of the event. The event is sponsored by the Maine Bicentennial Special Event Committee.
Additional information is available on the event website.
LAST TWO DAY OF THIS DX OPERATION
The Perseverance DX Group is organizing a team of experienced DXpedition operators to activate the South Orkney Islands (IOTA AN-008) from approximately Feb. 21, 2020 through March 5, 2020. South Orkney Islands is currently #16 most wanted on Clublog.
The team will be QRV from Signy Island on 10-160 meters, SSB, CW, RTTY and FT8. Located at 60 degrees south / 45 degrees west, we expect temperatures to hover around freezing most of the time, with constantly changing conditions of wind, rain, snow and occasional sunshine.
The team will erect two extreme weather tents for radio operations, sleeping and eating.
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It was 2 am on a cold and wintry 13th of December in 1926 when electronics wizard John Stroebel threw the switch that sent power surging through the tiny, home-built 50 watt transmitter set up in the basement of his Wheeling, West Virginia home. Upstairs, from the Stroebel parlor, that first WWVA broadcast crackled triumphantly over the air waves, while crystal set owners patiently endured noisy static to listen to that initial history-making radio transmission.
WWVA launched the new year and the new decade of 1950 with a significant change in programming. On January 2nd, the station began 24 hour operation, its strong nighttime signal now carrying all through the night to the millions of WWVA listeners throughout the Northeast and Canada.
UPDATE – Currently closed to the public.
Scientists come from around the world to use the Green Bank Telescope, because it is the most accurate, versatile, large dish radio telescope in the world. Its suite of receivers covers 100 MHz to 100 GHz in frequencies, its processors can spot nanosecond timing differences in data, and it observes under radio-quiet skies. The Green Bank Telescope can be used to do chemistry, physics, radar receiving, and astronomy and has no equal in the world.
With spring and summer around the corner it would be a good time to visit Greenbank and nearby is Cass Railroad. The Snowshoe resort offers very reasonable rates in the summer after the skiing season plus there are motels and B & B’s in the area. Greenbank is an easy and scenic drive from Pittsburgh approximately 4 hours.
This is my antique Victor Radio not RCA Victor yet. Still plays 40’s music for some reason must be stored in its memory. HI HI