into the voice of the Association,
kHz at 2300Z
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.
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 firstname.lastname@example.org 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
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.
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.
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.
Radio Becomes Primary on 1900-2000 kHz on August 6
"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.
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
Liberty Park and Community
History: A Century of Amateur Radio and the ARRL
Check into our sister net,
the Georgia Traffic and Emergency Net
Georgia Cracker Radio Club Newsletters from the past Provided by WA4IQU and ND4XE
Enjoy the link here!
....................Send your news, stories, comments, agitations, aggravations, hate and discontent to the