Exploring the End-Fed Half Wave Antenna

Ferrite core

Tony K6TTP sent us this article on the end-fed half-wave antenna written by John VA3KOT for Ham Radio Outside the Box. “This is probably the best overview article on end-fed half-wave antennas I’ve read in many many years. It broadly addresses in brief the fact and opinion that exists in the EFHW world, and explains the complexities, alternatives, and some variations on the type.” It’s a great introduction for anyone considering constructing one of their own. The caption for the image accompanying this post reads, “49:1 showing 2xFT140-43 ferrite cores. No case, insulated wire protects windings from moisture.”

You can tell us about your antenna building adventures on Instagram, Threads and Mastodon.

SPARC and Friends Support Family Bike Ride

SPARC was proud to provide communication assistance to South Pas Active Streets during a community cycling event on Saturday, March 16. Jason KM6WJQ and David KK6DA, two active members of ARES LAX NE who recently worked the Firecracker 10k in a similar capacity, lent their considerable expertise. Together with John KK6ZVQ, they monitored the progress of a bike caravan along Mission Street and informed ride marshals whenever the group became split up by red lights or delays.

South Pas Active Streets organized over eighty bicyclists to ride from Garfield Park to the South Pasadena Nature Park and back. Over half of the riders were children, many of whom had never visited the Nature Park or Arroyo bike path before. Several community groups participated in activities at both parks, including South Pasadena Beautiful, Friends of the South Pas Nature Park, the D.U.D.E.S., a local Lionsheart chapter, and The Hive which provided a craft station. Mayor Evelyn Zneimer and Councilperson Janet Braun joined the group and spoke about the importance of community involvement with our civic planning.

Below are two embedded Instagram posts showing a selection of photos from the event.

We look forward to helping with similar events in the future!

March 2024 Meeting: Restoring Vintage Radios

At our March 2024 meeting, SPARC welcomed Joe and Sandra Fekete to discuss vintage and antique radio restoration. Joe Fekete is an active member of SCARS, the Southern California Antique Radio Society. He was a ham in 1970s and has served as an FCC liaison. He currently lives in Monrovia with his wife Sandra who is a self-described “conehead,” which in the restoration hobby means someone who specializes in repairing speakers.

Sandra and Joe Fekete

Joe and Sandra demonstrated their techniques for restoring old radios to appear “right off the assembly line.” For example, when stuffing capacitors they recreate vintage labels to preserve technical information and capture the look of the original components.

Vintage capacitor labels ready to be scanned and reprinted

The meticulous couple spent three years restoring the radio of a 1957 Corvette on behalf of Cerritos collector Kent Browning.

Sandra holds the metal frame of a classic Corvette speaker.

Here are a few resources the Feketes mentioned for anyone interested in attempting a restoration:

If you’re interested in acquiring a vintage radio, SCARS will hold a swap meet in Burbank on June 15.

Several SPARC members have extensive experience with vintage ham equipment. Bob WB6YJJ brought in two beautiful vintage radios and an oscilloscope, seen below.

A nonworking 1930s commercial radio from the Feketes (top left) and three working pieces of equipment from Bob WB6YJJ

The gleaming transmitter on the right is a working Johnson “Viking Valiant” from the late 1950s. Rick KI6ZKM brought a Hallicrafters rig that he plans to repair.

Interior view of a Hallicrafters rig owned by Rick KI6ZKM

Tony K6TTP shared several tips for anyone embarking on a restoration:

  • Document everything with photos.
  • Locate a trustworthy schematic for your rig and compare it to the physical equipment.
  • Replace all the capacitors. If a vintage capacitor hasn’t failed, it will. 

Tony recommends Old Radio Parts for obtaining replacement components and the website HiFiAudio.com for its many kits and guides. Tony is restoring a Hallicrafters SX-140 with help from HiFiAudio’s guide.

Mark WB6CIA suggested building a collection of vintage tube substitution books. He also consults SAMS Photofact manuals which can be ordered online or found in vintage bookstores.

SPARC thanks the Feketes for a fascinating presentation, and thanks all the members who shared their equipment and wisdom.

Amateur Radio Booklet by Noël F4JJD

Flying around the web, I found this useful booklet created by Noël Martin, F4JJD. It’s called, simply enough, the Amateur Radio Booklet 2024 Edition (3.3 MB PDF). It includes:

  • Band Plans
  • Classification of Emissions
  • Q Codes
  • Morse Code
  • Radio Abbreviations
  • Digital Modes
  • Radio Waves Physics
  • Prefixes Allocations
  • Amateur Radio Grid Locator

Noël maintains the booklet as a project on GitHub. According to his personal site, he’s a ham and software engineer in France. You can follow him on Mastodon here.

TNX to Cale K4HCK, and his great newsletter Amateur Radio Weekly, for the link!

February 2024 Meeting: Working Satellites with Clint Bradford, K6LCS

Our February 2024 meeting was held via Zoom and featured Clint Bradford, K6LCS presenting “How to Work Amateur Satellites with Your HT.” Clint has been a ham since 1994. His niche in the hobby is working amateur satellites with minimal equipment and spreading the word on how to do it. He has served as a liaison between NASA, the ARISS team, and schools coordinating amateur radio contacts between the International Space Station and students. Clint has created a support Web site at work-sat.com that’s a one-stop source for all the citations, equipment recommendations, and software suggestions made in his presentation. He also maintains a Groups.io list at work-sat.groups.io. He resides in Jurupa Valley, California, with his wife Karen, who expertly handled Zoom duties during the meeting.

Some notable Clint quotes:

  • Why work satellites? It’s just another cool thing we can do in this wonderful hobby of amateur radio. 
  • Tips to improve your HT’s battery life: Cut your output power in half, improve your antenna, use an earpiece. 
  • It’s rocket science… but it ain’t rocket science.
Photo from Clint’s QSL card. He’s seen here at the LA County Fair, where he worked three countries using only 2W of power.

Some slides from the presentation:

Other useful links besides work-sat.com:

Software recommendations:

SPARC thanks Cliff and Karen for an informative (and funny!) evening.

OTHER CLUB BUSINESS

  • Join our Groups.io list and become a member
  • Our simplex net returns next week on 2/14. Chris KM6OUK is compiling signal reports from the simplex nets so we can map propagation behavior in our area.
  • The Battleship Iowa Amateur Radio Association (BIARA) will hold a special event station on February 22 from 1600 to 2400 UTC. Try contacting this unique radio station to our south in San Pedro.

UPCOMING MEETINGS

  • March 6 at 7:30 p.m. — We’re back at the Eddie Park House where we will be joined by Joe Fakete, an active member of the Southern California Antique Radio Society. Joe will speak on vintage and antique radio restoration. Bring an old ham rig or vintage consumer radio, and Joe will walk you through the steps to put it back in working order. Email us if you would like to bring some equipment but need help transporting it. Related: Jim Fisher, the president of SCARS, invites everyone to learn more about the group, become a member, and participate in SCARS’s annual auction. It takes place on 2/17 in Tustin. 

  • April 3 at 7:30 p.m. — Also back at Eddie Park House, our guest will be Diana Feinberg, AI6DF. Diana is section manager for the ARRL LAX section. Her visits to SPARC to update us on League business and the state of amateur radio are an annual tradition.

73!

January 2024 Meeting: Simplex Operations

Radio Mobile Online propagation prediction

At our January member meeting we introduced the new club officers for 2024 and thanked outgoing president Stan Tahara KR6CV and outgoing treasurer Bob Vanderwall WB6YJJ for all their hard work.

Our featured topic was simplex operation and tips for participating in a simplex net. Jeff Liter, W2JCL gave a presentation which you can view embedded below. Download a PDF copy (1.1 MB) of it by clicking here.

Links from the presentation:
Radio Mobile Online propagation prediction tool
Having Fun with VHF” presentation by Bob Witte K0NR
Ed’s Radio, site listing Southern California nets

In conjunction with the discussion of simplex, we announced the addition of a new simplex net to our monthly schedule (click here for full details).

SAVE THE DATES
January 20: ARRL January VHF Contest. A good opportunity to get on the air and test your equipment. We encourage you to participate from home or the field.

January 27: Winter Field Day. Join SPARC in Eddie Park for this annual emcomm practice event.

JOIN OUR GROUPS.IO
SPARC is migrating its mailing list to groups.io so members and friends can have more control over how they receive news and updates from the club. Whether you are a long-time member or simply interested in hearing about our activities, we hope you will subscribe and stay in touch.

IT’S DUES TIME
And speaking of membership, now is the time to join or renew. Dues are only $20 per year, per household. Cover all hams at the same address with one payment!

📻 Returning members renew by clicking here.

🙌 New members join by clicking here.

If you have more than one ham in your household, please submit a membership form for each person so we can add everyone to our member database.

73!

New Net Schedule for 2024

Starting on January 10, SPARC will experiment with adding a simplex net to its monthly schedule. We will adjust the net based on need and experience if necessary. Here is the current monthly schedule.

1st Wednesday of the month, 7:30 p.m.
Monthly member meeting — NO NET

2nd Wednesday of the month, 7:30 p.m.
Simplex net on 145.600 MHz, no PL tone

3rd and subsequent Wednesdays, 7:30 p.m.
Check-in Net on the TELCO Repeater
145.180 MHz
PL 156.7 
Negative offset

Our goals for the simplex net are to practice emergency communications skills and to develop a propagation map of the city so that club members know “who can hear me” without a repeater.

Please join our Groups.io announcement mailing list for news about meetings, events, and changes to the net schedule. We hope to hear you on the air soon!

Wrapping Up 2023 and Looking Ahead to 2024

The Canoe House

Our November 2023 membership meeting was cancelled due to a guest speaker falling through, but spirits were high at our annual December social at the Canoe House restaurant. Over a dozen members gathered to catch up and discuss their various radio-related projects.

A week later, during our December 13 on-air net, participants described their favorite ham radio gifts, either received or purchased for themselves. The fond memories included:

To inspire future hams, Mark WB6CIA suggested donating a pair of walkie-talkies to a Toys For Tots drive.

On behalf of everyone at SPARC, we hope you have a happy, healthy, and radio-active 2024!