Georgia Single Sideband Association
Serving Amateur Radio since 1960



Check into the voice of the Association,
the Georgia Single Sideband Net, nightly on

3975 kHz at 2300Z




ARRL Southeast Division



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Upcoming Hamfests

Huntsville Hamfest
August 15-16
Huntsville, AL

MORE

Shelby Hamfest
September 5-6
Shelby, NC

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LaGrange Hamfest
October 10
Lagrange, GA

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Stone Mountain Hamfest
November 7
Lawrenceville, GA

MORE

HamJam 2015
November 14
Alpharetta, GA

MORE

 


Amateur Radio Roundtable

Tune in to Amateur Radio Roundtable, a live weekly amateur radio webcast and simulcasted shortwave program, held every Tuesday night at 8 PM CDT (0100 UTC Wednesday). The show can viewed at W5KUB.com or heard on shortwave radio station, WTWW on 5085 KHz. Tom Medlin, W5KUB, is joined by co-host Ted Randall, WB8PUM, from the QSO Radio Show. The show covers a wide range of topics for ham radio operators, shortwave listeners, and electronic hobbyists; including balloon launches, Satellite, go-kits, emergency communications, SDR, digital modes, DXing, home brewing, and more.


Our guest for next week's show (August 4) will be Charlie Emerson, N4OKL, from Huntsville, Alabama. Charlie is chairman of the Huntsville Hamfest which will be held August 15-16. During the hamfest, W5KUB.com will be awarding donated vendor prizes, including a prize from the Huntsville Hamfest committee.

To watch Amateur Radio Roundtable go to W5KUB.com. To join the chat room, sign up for a W5KUB.com account. It only take a couple of minutes. If you are listening on 5085 KHz, we would like to hear from you. Please send an email to tom@w5kub.com and tell us your location and signal report.

A backup video server has been implemented. In the unlikely event that a viewer cannot access the main video server, viewers will now have the option to select our backup server.

Be sure to check out Ted Randall's show, the QSO Radio Show. Information about Ted's Saturday shortwave show can be found at qsoradioshow.com.

We need help with topics. If you have a specific subject that you would like to present in a future show, send an email to tom@W5KUB.com.

Forward this message to a Friend will allow you to share this message with your friends.

Join us for fun and interesting discussions!

-Tom Medlin, W5KUB

 

New Horizons Phones Home

NASA's New Horizons spacecraft made its historic rendezvous with Pluto this week. While there is no direct Amateur Radio involvement in the Pluto flyby, many amateurs are curious about how NASA communicates with New Horizons at a distance of nearly 3 billion miles.

At that vast distance, New Horzions' radio signal is extremely weak -- so weak that only the Deep Space Network's largest 70 meter parabolic dish antennas and receivers are capable of detecting it. New Horizons downlink transmissions take place on an X-Band frequency of approximately 7 GHz. In terms of raw RF output, the traveling wave tube amplifiers (TWTAs) aboard the spacecraft supply only 12 W to its 2.1-meter high-gain antenna.

There are two TWTAs aboard New Horizons. Each is connected to a separate radiating element at the antenna. One element is configured for left-hand circular polarization and the other for right-hand circular polarization. The original intent for using two TWTA was for redundancy.

As the spacecraft was on its way to Pluto, however, engineers discovered that they could use this cross-polarized configuration to transmit two signals simultaneously. At the Deep Space Network they designed a system to detect the separately polarized signals and combine them for substantially greater gain.

A stronger signal means New Horizons can transmit at a higher data rate -- about 1.9 times the rate than with a single TWTA. Unfortunately, New Horizon's nuclear-powered generator has decayed during its 10-year flight, and there is no longer enough power to run two TWTAs at the same time, unless the team shuts down another onboard system.

This is why it will take considerable time to download the treasure trove of images and other information that New Horizons carries in its memory. At present, New Horizons is transmitting data at just 1 kByte per second. A typical image produced by LORRI, the Long Range Reconnaissance Imager, is about 2.5 Mbytes, even when compressed. At such a low transmitting data rate, it takes about 42 minutes for New Horizons to transmit a single image to Earth -- and then there is the 4.5-hour trip at the speed of light! This is why mission scientists are warning an impatient public that it will be well into 2016 before all of the data arrives at Earth.

A footnote: In 2005, NASA invited individuals to sign on to the "first mission to the last planet." Their names -- and sometimes Amateur Radio call signs -- burned onto a compact disc went into deep space on the New Horizons spacecraft. Participants, such as ARRL member Angel Santana, WP3GW, received a certificate of appreciation from NASA. He wondered how many other hams were among the more than 430,000 who took NASA up on its invitation to, "Come with us as we complete the reconnaissance of the solar system and unlock the secrets of Pluto, its moon Charon, and the Kuiper Belt."

For more details about the New Horizons RF communication system, see "The RF Telecommunications System for the New Horizons Mission to Pluto" from the Johns Hopkins University Applied Physics Laboratory.

-- Thanks to Steve Ford, WB8IMY; Angel Santana, WP4GW, ARRL Letter

 

 

Heat: Summer's #1 Killer

Twenty years ago this summer, a heat wave struck Chicago, leading to the deaths of nearly 750 people during a single week. The Chicago heat wave of 1995 tragically demonstrated that heat and humidity can be a deadly combination. These factors put a lot of stress on the human body and can lead to serious health conditions such as heat exhaustion, heat stroke, or even death. The more extreme the temperature, the shorter the amount of exposure time needed to fall ill.

Heat waves have the potential to cover a large area, exposing a high number of people to a hazardous combination of heat and humidity. In fact, heat is typically the leading cause of weather related fatalities each year. High temperatures and humidity are common in numerous locations across the country. However, when temperatures spike and humidity is on the rise in areas of the U.S. that are not accustomed to these conditions, people don't necessarily understand that they need to take action to stay safe.

The Heat Index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. High humidity levels combined with hot conditions can be extremely dangerous. Limit your outdoor activities during these periods.

- National Weather Service

 

 

Amateur Radio Becomes Primary on 1900-2000 kHz on August 6

Amateur Radio will be upgraded from secondary to primary in the 1900-2000 kHz segment of 160 meters in the US on August 6. That's the effective date of the WRC-07 implementation Report and Order and WRC-12 Order portions of a lengthy FCC document released on April 27. Both appeared in the Federal Register on July 7; the Notice of Proposed Rule Making (NPRM) of the same proceeding was published in the Federal Register on July 2. The Radiolocation Service (RLS) has been primary in the band segment. The FCC also made a secondary allocation of 135.7-137.8 kHz to the Amateur Service, but this band will not be available until service rules have been adopted.

"The FCC action with respect to 1900-2000 kHz reduces the possibility that we might suffer in the future from new Radiolocation Service deployments," said ARRL CEO David Sumner, K1ZZ. "On the other hand, we will have to put up with radio buoys that have been operating illegally in the band but that now have been 'regularized' by the Commission."

The FCC said that while it had believed there was no non-Federal RLS use of the 1900-2000 kHz band, the record indicated there are maritime users, including the US "high seas" migratory species fishing fleets, making use of radio buoys in the Atlantic and Pacific oceans as well as within 200 nautical miles of the coast. It did not identify these users in the WRC-07 proceeding, however, "because they did not appear in its licensing database," it said.

"Apparently, fishing vessels have operated radio buoys in US waters under the belief that a ship station license issued under Part 80 of the Commission's rules permits operation of the buoys," the FCC Order continued. The FCC said a Part 80 license applies only to stations in the maritime services and does not authorize operation of radio stations requiring a Part 90 license, "such as the radio buoys at issue here."

The FCC said its action regarding 1900-2000 kHz supports increased use of 160 meters as reported by commenters in the proceeding and provides "spectrum support" for Amateur Radio emergency communication. The FCC said its action also offers the Amateur Service "the long-term security that primary status entails."

In removing the primary RLS allocation, the FCC added a new footnote to the US Table of Allocations that provides for radio buoy operations in the 1900-2000 kHz segment on a primary basis in Region 2 (the Americas) and on a secondary basis in Region 3, which limits operations to the open sea.

-ARRL Letter

If anyone ever reads any of this, a few of us migrate to 1883 at night. Sometimes. There aren't very many of us, and if the summer noise is too bad we don't, but check there if you still want some low band fun after dark!

 

 

The Augusta A.R.C. Hamfest / Techfest

September 12th, 2015, Time: 7am – 2pm

Admission: Free

Liberty Park and Community Center
1040 Newmantown Road
Grovetown, Georgia 30813

 

 

Radio History: A Century of Amateur Radio and the ARRL

Look at this "history" of ham radio through the eyes of the ARRL, an interesting read!

 

Check into our sister net, the Georgia Traffic and Emergency Net
nightly at 7:15 PM Eastern on 3982.5 mHz
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Georgia Cracker Radio Club Newsletters from the past Provided by WA4IQU and ND4XE
Enjoy the link here!



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