The Radio Network that Allowed Communication with Submarines

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.

Read The Full The Full Story Here

On-line Instruction to learn Morse code.

With many youngsters at loose ends as a result of school closings due to COVAD-19 concerns, the Long Island CW Club is offering students free on-line instruction to learn Morse code.

Howard Bernstein, WB2UZE, a founding member of the Long Island CW Club explained that learning Morse is a fun and educational activity for children of all ages that can fill part of the gap left by the current unfortunate situation that has closed so many schools across the country.

Therefore the Long Island CW Club will be offering on-line Morse code classes each Monday through Friday starting on Monday, March 23rd specifically for school-agers anywhere across the country or overseas.

Instruction will be conducted via Zoom on-line video conferencing, requiring a computer equipped with a microphone and camera.

Classes for elementary school-aged children will run 30-minutes starting at 12:00 noon EDT (16:00Z) , followed by 45-minute classes for middle and high-school-aged youngsters starting at 12:45 p.m. EDT (16:45Z)

There is no charge for participation, but parental permission is required through advance registration by contacting the class instructor, Robb Zarges, K2MZ, by e-mail at k2mz@yahoo.com or telephone at 508-8318248.

The Long Island CW Club (www.longislandcwclub.org) is dedicated to the history and preservation of Morse code communications. Its team of 15 instructors offers 25 on-line video conference classes each week at different skill levels, currently serving more than 300 students in 44 states and ten countries.

Extra Question Pool Update July 1st

QST de W1AW
Special Bulletin 4 ARLX004
From ARRL Headquarters
Newington CT March 19, 2020
To all radio amateurs

SB SPCL ARL ARLX004
ARLX004 Errata to 2020-2024 Amateur Extra-Class Question Pool
Released The NCVEC Question Pool Committee has issued errata to the new
(2020-2024) Amateur Extra-class question pool that goes into effect
on July 1.

Most changes are minor, involving typographical or style errors.

Keycard Access

Members – As per the president request key card access has been remove from your key cards.  No access will be able until current situation improves and the president gives the all clear.

If You have any questions or concerns please send them to:
Richie Danko
n3sbf@comcast.net


NOTE! If there is an ECOMM situation please contact any leadership member for access to the building.  The leadership team is Richie, Matt, Joe, Walt they can still access the building

 

Business Meeting Been Cancelled

The Steel City Club House Is Closed Until Further Notice

Business Meeting: CANCELED
Social Meetings: CANCELED
VE Testing Session: CANCELED
Operating From Club: CLOSED
Remote 1 OPEN – Remote Hams for Members
Remote 2 OPEN – VNC & Skype for Members
Repeater 147.03 MHz & PL 123: OPEN For ALL
Repeater 444.45 MHz & PL 103.5 & C4FM: OPEN For ALL
Echolink & Wires X: ACTIVE.


Tuesday Night 2m Net 8 PM:  All Are Welcome
Sunday QCWA 2m Net 8:30 AM: All Are Welcome
Sunday Digital 70cm Net 8:00 PM: All Are Welcome
Nightly 10m Chat 28.495 MHz ~8:00 PM: All Are Welcome

Attention – Simplex Test

UPDATE – Still on for Sat March 21st

The Allegheny County EC, NU3Q will be doing a Two Meter Simplex test on Saturday March 21st from 10-11 AM. We will be testing on 146.550 MHz between the Steel City club house and the Red Cross Building and the National Weather Service.  NU3Q will be looking for someone to operate from  from the Red Cross & NWS.  All hams are invited to participate in this drill from their homes and roving in their cars. Please call  W3KWH on 146.550 Mhz and let them know your location and power levels.

UPDATE: NU3Q will be doing a check in on the 147.090 machine before the simplex test begins. So check into the N. Hill repeater before you goto to the 146.55 Mhz frequency.

UPDATE: The NWS is closed now to the public there will be no operations from there

There will be a SET Drill on April 4th using HF and the North Hill 147.090 Machine.  Simplex on 2m might be tried out then too.  More details on the SET Drill are to follow soon.