Locating RF Interference at HF

A proven and practical approach to dealing with RFI from grow lights and more.

By Tom Thompson, WØIVJ
Radio frequency interference (RFI) increased dramatically in my neighborhood
recently. Locating the sources was not easy, due in part to the distances involved.
The typical range for a consumer device that meets the applicable FCC Part 15 or
18 emissions limits is usually no more than a few hundred feet. Some of the
sources in my area, however, were more than a half-mile away. The usual “sniff”
methods weren’t practical, and without an initial heading, the sources were difficult
to find. Furthermore, they were primarily HF sources. I needed a radio direction
finder, but an HF handheld Yagi was not an option!

Continue reading on the ARRL website

 

AMSAT and ARISS Designing for Lunar Gateway

Details are still being fleshed out, but AMSAT and ARISS are working on the design of an Amateur Radio system for NASA’s Lunar Gateway. As NASA explains, the Gateway “will be a small spaceship in orbit around the moon that will provide access to more of the lunar surface than ever before with living quarters for astronauts, a lab for science and research, ports for visiting spacecraft, and more.” For NASA, the Lunar Gateway is “a spaceport for human and robotic exploration to the moon and beyond.” For radio amateurs, the Lunar Gateway will represent the next step in moving ham radio out of low-Earth orbit and into deep space. Under the current timeline, initial sections of the Gateway are scheduled to launch in 2022, with the Gateway in lunar orbit by 2026.

“To make this happen, we are leveraging the work and expertise of the worldwide AMSAT organizations and the international ARISS community in this endeavor,” ARISS-International Chair and AMSAT Vice President for Human Spaceflight Programs Frank Bauer, KA3HDO, said. “We have an international team working on this and are meeting twice a month to mature the concept.” The ARISS concept was presented to NASA in May and got positive feedback, and was favorably received a few weeks later at the ARISS-International meeting in Montreal from the Canadian Space Agency’s Gateway Program Manager.

“The Amateur Radio Exploration (AREx) team has done some really good work,” Bauer continued. “The challenge for amateurs will be on the order of a 30 dB signal path loss as compared to LEO. But the link margins on our design seem too close.”

Read the full short here: ARRL.ORG

August Work Party Pictures

Take a look at the pictures  taken at the work party Aug 2019.  That our Karl, WA3VXJ mounting our new Hex Beam antenna on the far tower. After that he was up the VHF tower remounted the 2m beam antenna. I also got to ride up  70 feet to take some pictures.

« 1 of 2 »

All antenna projects are now done!

The last antenna is now up and open for contacts

Click Image for full size image

Now all the tower are filled with antenna’s at the steel City club house.  The NA4RR Hex Beam antenna is on top of the far tower.  Contacts have all ready been made with Joe WA3FWA making the first contact with an parks on the air station in Nova Scotia.  This antenna will cover the follow bands: 6, 10, 12, 15, 17, and 20 and buy throwing a switch at the patch panel it will cover the 40m band also.  Members should log into the member only section to see the article for all of Steel City antenna farm.

Here is a nice article describing the NA4RR hex beam

Work Party – Part 2

Work Party – Saturday – Aug 3 – 8:00 AM

Attentions all Steel City members there is going to be an antenna work party at the club house on Saturday Aug 3rd starting at 8:00 AM.  We have several projects plan and can use your help. New rotor cable been run and tested several times. After finishing the Hex Beam will mount the 2m antenna on the VHF tower.

  • Finish the new Hex Beam to the far tower
  • Mount the 2m beam to the VHF Tower

* NOTE If your taking pictures please bring your data cable so that your pictures can be posted on the website

 

Coax Cable

From the ARRL “So What” podcast
All about the Coax Cable


Regardless of whether you are operating at HF, VHF or UHF, the quality of your feed line is critical to your station. The feed line (also called the transmission line) is the RF power conduit between your radio and your antenna. All the energy you generate travels to the antenna through the feed line. By the same token, all the signals picked up by your antenna must reach your radio through the same feed line.

Read the rest on the ARRL Website

Wikipedia Artical:  Coaxial Cable info

 

2019 Corn Roast

STEEL CITY AMATEUR RADIO CLUB
ANNUAL CORN ROAST WILL BE HELD

August 18, 2019 at 1:00 PM 

This is open to all Steel City ARC member and pending members.  Bring your YL and kids and enjoy this annual get together with the whole Steel City family.

For More Information See the Corn Roast Website

Please send Carol your RSVP so she can get a good head count
she can be emailed at the follow address. 

N3SBF@COMCAST.NET
RSVP by  Aug 3rd

World Scout Jamboree — NA1WJ Station

World Scout Jamboree — NA1WJ Station

You can work the World Scout Jamboree station July 22 to August 1.

We will be posting our operating frequencies in real time on Facebook and Twitter. You can also join our email group at https://groups.io/g/na1wj.

See Amateur Radio Live from the Jamboree for detailed information on frequencies.


Steel City Members:  Please keep an eye on this the scout will be looking for some contact and they will need our help

SSB in MHz: 28.390, 24.960, 21.360, 18.140, 14.290, 7.190, 3.940

PSK-31 in MHz: 28.120, 24.920, 21.080, 18.100, 14.070, 10.142, 7.080, 3.580

EchoLink: Conference *JAMBO* (node 832996).
Please plan to connect via *JAMBO* conference for best results.

CW: There will be limited operation on CW as time permits. See Scouting Frequencies.

SATELLITES: We will be active on the FM and SSB satellites.

Wall Street Tries Shortwave Radio

Wall Street Tries Shortwave Radio to Make High-Frequency Trades Across the Atlantic

Editor Note: While this is not an direct amateur related article it is using our technology. Hopefully it doesn’t hurt our small bands.

Read the full article here:  IEEE Spectrum 

Shortwave radio is venerable technology, dating back to the early part of the 20th century. Radio amateurs, often called hams, use it to contact one another around the world with modest equipment. So it’s surprising, really, that high-frequency traders have only lately begun to take advantage of this technique. But that appears to be what is happening.

I say “appears” because there’s only indirect evidence that traders are pursuing this approach. Most comes from Bob Van Valzah, a software engineer and networking specialist who characterizes himself as a “latency buster.” By chance, he stumbled on an odd-looking cell tower in West Chicago, near where he lives, and after much investigation  concluded that the giant antennas sprouting from it were sending signals about goings on at the Chicago Mercantile Exchange to trading centers in Europe.

Who exactly is using this link? If you dig through the FCC’s online license database, you can find that although the official license for the West Chicago tower that Van Valzah investigated was awarded to one company, the “real party of interest” is IMC B.V., a technology-driven trading firm that has invested in McKay Brothers [PDF] and thus is no stranger to the value of low-latency radio links.

Read the full article here:  IEEE Spectrum

Here is another more detail post on what is going on here:
SHORTWAVE TRADING | PART III | FOURTH CHICAGO SITE, EAST COAST