Many thanks to Bert Henderson, W6MSD, for Wednesday’s excellent presentation on DIY off-center and end-fed wire antennas.

Here is a link to his excellent presentation in pdf format.

…Are available on our Photos Page

Our next WVARA meeting will be held in-person on Wednesday, November 13, in Meeting Room 3 at the Silicon Valley Chapter of the American Red Cross, 2731 N. First Street at Plumeria Drive (southwest corner) in San Jose.  Social time begins around 6:45pm, with the meeting commencing at 7pm.  If you haven’t been to the Red Cross in a while, “talk-in” is usually available on the Association’s repeaters. Best choice would be 2m/220.  

This month’s presenter will be WVARA member Bert Henderson, W6MSD.   There are plenty of commercially-made HF antennas that you can buy.  But why not save some dollars and build your own?  Bert will talk about DIY wire antennas that you can make yourself with an emphasis on end-fed and off-center fed antennas.  He will present on the transformers and antennas he’s designed and made, some basics on how they work, a summary of other available info.  He will also bring some of his home-built hardware to show, as well as his nanoVNA to demonstrate a measurement or two.

Bert retired last year after a career developing microwave components and subsystems.  He’s an innovator with six patents and a leader in frequency conversion, signal generation, and control technologies.  His ham radio interests include antenna design, CW, and (of course) Field Day.

BTW, several of us meet nearby for dinner prior to the meeting at 5:30pm at Disn-N-Dash (2551 N. 1st St. San Jose):  https://dishdash.com. Feel free to join us.

Three things to remember:
• Since the west side entrance to the Red Cross Building is always locked, we recommend entering the Red Cross Building through the main entrance situated on the north side of the building.
• The Red Cross locks the main entrance at 7pm sharp, so please come early in order to get access to the building.  
• Since Meeting Room 3 is about 100 feet from any entrance, any late comers who knock on an outside door won’t be heard from our meeting room.  So please try to arrive early!  If you need help getting in the door, you can call Tim’s cellphone:  408-929-9311 or mine: 408-636-6172.

Jim, K6EI
WVARA Vice President

WVARA Beach Party POTA Saturday, November 9, 2024, from 9:30 am to about 3:30 pm

Manresa Main State Beach, day use picnic area

POTA: US-3469
1445 San Andreas Rd, Watsonville 95076 (Admission fee or CA state park pass needed)

The West Valley Amateur Radio Association (WVARA) is having a Beach Party POTA. It is a chance to get outside, have fun and play radio with old and new friends. We always welcome and enjoy seeing members and non-members, meeting new hams, and showing off and explaining our hobby with interested non-hams.

If you’re recently licensed, stop by and make some new friends. Perhaps you can get a little help with a cantankerous HT, some antenna advice, or check out different gear and operating modes.

If you don’t have a license and are interested in what amateur radio is about, come by and ask questions, see some of what we do and try getting on the air.

If you are a ham and interested in POTA (Parks on the Air), but not sure about what to do or not yet registered, we can help you with that. It is easy and free!

To spice it up a little, we’re going to:
• Try getting some kind of a kite antenna up and make some contacts using it 

• Award a few prizes

We have some great prizes we’re going to award. Prizes will be awarded by random drawing.

To enter a drawing, you’ll need to check in with “Beach Party Control”, receive a ticket for the appropriate drawing, and provide enough contact information so we can get in touch with you if you win something but are not around at the drawing .

For licensed hams, we’ll have a SOTABEAMS Band Hopper II 20m-40m antenna package, a PackTenna Mini In-line RF Choke and other fun and useful items to award.

If you are not yet licensed, but are interested, we’ll have a separate drawing for a copy of Gordon West’s 

Technician FCC Amateur Radio License Preparation book (10th Edition, 2022-2026 questions).

Food: Logistics:

We provide: charcoal, grilling tools, basic condiments, bottled H2O.
You bring: whatever you want to grill/eat, perhaps a side dish, snack or desert to share.

Bring any gear you’d like to operate. We’ll be QRP, but higher power is fine if you want: bring your own power and antenna. We’ll work out interference if needed.

If you’re hiking / biking / small vehicle-ing to the site, here’s what we’ll have there that you won’t need to bring (unless you have gear you want to try — always fun!).

We’ll have QRP-sufficient 12 volt power, and power distribution strips with PowerPoles. Bring your own PowerPole-equipped power cables.

We’ll have two or three push-up fiberglass masts. If you have antennas you want to try, bring them. If they need support beyond a push-up, you’ll need to bring that too.

If you need AC power (i.e. for a PC for digital), bring it.

Day of the event we’ll monitor 146.52 (2M call) and 446.00 (440 call).

Our next WVARA meeting will be held in-person on Wednesday, October 9, in Meeting Room 3 at the Silicon Valley Chapter of the American Red Cross, 2731 N. First Street at Plumeria Drive (southwest corner) in San Jose.  Social time begins around 6:45pm, with the meeting commencing at 7pm.  If you haven’t been to the Red Cross in a while, “talk-in” is usually available on the Association’s repeaters. Best choice would be 2m/220.  

This month’s meeting presentation is all about reducing RF noise in your shack by WVARA member Scott Nacey, KK6IK.   Scott will describe the ongoing saga of his battle with local HF RFI in Willow Glen which severely degrades all HF operation at his home.   He will present the process from the realization that he had a severe RFI issue, through the tools he brought and built in order to identify the many sources of interference both inside and outside of his house.   Once he acquired and  built the tools, the story continues with how he approached local companies mitigate neighborhood-wide problems as well as how he engaged the ARRL RFI Team and FCC to get the company that caused the most severe RFI to respond.   

In addition to Scott’s presentation, Tim Stehle (KN6FGH / WVARA President) will lead a group discussion on plans for WVARA’s upcoming POTA / beach party event scheduled for Nov 9.

BTW, several of us meet nearby for dinner prior to the meeting at 5:30pm at Disn-N-Dash (2551 N. 1st St. San Jose):  https://dishdash.com . Feel free to join us.

Three things to remember:
• Since the west side entrance to the Red Cross Building is always locked, we recommend entering the Red Cross Building through the main entrance situated on the north side of the building.
• The Red Cross locks the main entrance at 7pm sharp, so please come early in order to get access to the building.  
• Since Meeting Room 3 is about 100 feet from any entrance, any late comers who knock on an outside door won’t be heard from our meeting room.  So please try to arrive early! 

And don’t forget: PACIFICON is Oct 18-20.  https://www.pacificon.org/home   The technical forums will take a lunch break from 11:50 until 1pm on Saturday.  For those WVARA folks who are interested in getting together for lunch, let’s meet just outside the main entrance to the hotel lobby (i.e. the revolving doors) at 11:55.

Jim, K6EI
WVARA Vice President

Our next WVARA meeting will be held in-person on Wednesday, September 11, in Meeting Room 3 at the Silicon Valley Chapter of the American Red Cross, 2731 N. First Street at Plumeria Drive (southwest corner) in San Jose.  Social time begins around 6:45pm, with the meeting commencing at 7pm.  If you haven’t been to the Red Cross in a while, “talk-in” is usually available on the Association’s repeaters. Best choice would be 2m/220.  

This month’s meeting presentation is all about Digital Signal Processing by Jeff Kabel, AA6XA.   Digital Signal Processing (DSP) is everywhere in modern communications systems. Jeff’s presentation will give a qualitative introduction to DSP. We’ll cover basic DSP concepts and some simple examples. DSP can be very math heavy but Jeff’s presentation will not involve any difficult math. The goal is to give you a feel for how DSP works and some of the ways it is important to wireless communications.

Jeff got his license when he was 14 and in middle school. He upgraded to Extra a few years later in high school then went off to college to become an electrical engineer. After taking a break from ham radio for a few years he got back into the hobby after moving to California. Jeff is an avid SOTA activator, and his activations can be seen at http://www.youtube.com/@hambitious. He also enjoys homebrewing, VHF+ contests, and CW contests.

BTW, several of us meet nearby for dinner prior to the meeting at 5:30pm at Disn-N-Dash (2551 N. 1st St. San Jose):  https://dishdash.com . Feel free to join us.

Three things to remember:
• Since the west side entrance to the Red Cross Building is always locked, we recommend entering the Red Cross Building through the main entrance situated on the north side of the building.
• The Red Cross locks the main entrance at 7pm sharp, so please come early in order to get access to the building.  
• Since Meeting Room 3 is about 100 feet from any entrance, any late comers who knock on an outside door won’t be heard from our meeting room.  So please try to arrive early!  If you need help getting in the door, you can call my cellphone:  408-636-6172.

Jim, K6EI
WVARA Vice President

There won’t be an evening WVARA meeting in July or August. Instead, we are having our annual WVARA BBQ on Saturday, August 10 from 11am to 2pm. 

Our location (Owl Burrow Picnic Area, next to our traditional Pickleweed site) is inside Sunnyvale’s Baylands Park and includes multiple tables, grill, an AC outlet, and a covered awning for shade. There is an entry fee per car at Baylands Park, so you may prefer to carpool. We’ll have hot charcoal and condiments; feel free to bring some protein to grill.

Field Day: what an event it was! This year we operated QRP in the 12A Battery category from Mora Hill in Rancho San Antonio Open Space Preserve, overlooking the Silicon Valley from an elevation of 500 feet. We had a Get-On-The-Air (GOTA) station, three HF CW stations, three HF SSB stations, three HF digital stations, and five VHF/UHF stations including one with satellite link capabilities.

Our Field Day score in 2022 and 2023 had placed us at #2 out of roughly 4,000 entries nationwide — second only to W3AO on the East Coast. This year, we were in a good position to beat our previous QSO totals. But NOAA observed a M9-class solar flare (peaking at 1301z Sunday morning) which triggered a R2-moderate radio black-out. The sudden drop-off in signals caused some of our site’s operators to wonder if their rigs/antennas were still working properly. Needless to say, we came in a bit below last year’s QSO totals, but still with impressive results: 2,426 contacts and a preliminary total score of 23,690

Antennas on Mora Hill this year included a 4-band (10/15/20/40) yagi, a 2-element wire yagi on 40, and 2-element quads on 10, 15 and 20. In order to minimize interference between the CW and digital stations, Bobby located the digital tent’s triband yagi and dipoles about 200 feet from the rest of the site. The digital team was able to avoid long runs of coax by installing the digital RF hardware for both of their stations in the van and then running 200 feet of Cat5 Ethernet cable to the main site where the digital tent and terminals were located.

Our next WVARA meeting will be held in-person on Wednesday, June 12, in Meeting Room 3 at the Silicon Valley Chapter of the American Red Cross, 2731 N. First Street at Plumeria Drive (southwest corner) in San Jose.  Social time begins around 6:45pm, with the meeting commencing at 7pm.  If you haven’t been to the Red Cross in a while, “talk-in” is usually available on the Association’s repeaters. Best choice would be 2m/220.  

This month’s meeting will be a double-header.  

1. Ed Fong, WB6IQN, will tell us about the latest original idea in ham radio — the ultra compact, all-mode portable HF transceiver:  the uSDX+ .  
2. After Ed’s presentation, we’ll finalize our WVARA’s plans for Field Day on Mora Hill, which in case you haven’t heard is June 21-23. If you haven’t done so already, feel free to fill out our on-line participant survey so that we can include you in our Field Day plans.  
   Here’s the URL:  https://www.surveymonkey.com/r/NB28TGZ

>>>>>>>>>

Here are some details about Ed’s presentation:  

The uSDX+ is a software-defined transceiver based on the Silabs synthesizer chip and the Atmel ATMEGA 328P  FPGA.  The entire radio including the 4000mAh Lion battery is only 1 lb 2 oz.  The radio can operate all weekend with a single charge.

• General coverage receiver – 3.5MHz- 30 MHz
• Transmits on 80-10 meters including all WARC bands
• Built-in CW decoder, keyer, all DSP filter from 4KHz to 50 Hz, DSP noise reduction
• Output –  5 watts for CW –  for SSB  slightly under 10 watts.

This rig uses a Class S is a switching amplifier, so although efficient, it cannot be directly used as a SSB output stage which historically requires a less efficient linear amplifier.  So how do they achieve linear SSB amplification from a switching amplifier and achieve 80%+  efficiency?  The key is in the 800 kHz sigma delta modulator.  Ed’s presentation will focus on this clever approach to generating SSB.

Ed Fong was first licensed in 1968 as WN6IQN.  He later upgraded to Extra Class (when 20 WPM was required ) with his present call of WB6IQN.  He obtained the BSEE and MSEE degrees from the Univ. of California at Berkeley and his Ph.D. from the Univ. of San Francisco.  A Life Senior Member of the IEEE, he has 12 patents and over 40  published papers and books in the area of communications and integrated circuit design.  Presently, he is employed by the University of California,  Santa Cruz (previously with Berkeley from 1997-2010) as an instructor teaching graduate classes in Antenna Design,  RF design and high speed interface.  In his 35 year career, he has done work for Stanford University, National Semiconductor, Advanced Micro Devices, numerous startup companies in the Silicon Valley.

>>>>>>

BTW, several of us meet nearby for dinner prior to the meeting at 5:30pm at Disn-N-Dash (2551 N. 1st St. San Jose):  https://dishdash.com . Feel free to join us.

Three things to remember:

• Since the west side entrance to the Red Cross Building is always locked, we recommend entering the Red Cross Building through the main entrance situated on the north side of the building.

• The Red Cross locks the main entrance at 7pmsharp, so please come early in order to get access to the building.  

• Since Meeting Room 3 is about 100 feet from any entrance, any late comers who knock on an outside door won’t be heard from our meeting room. So please try to arrive early!  If you need help getting in the door, you can call my cellphone:  408-636-6172.

Jim, K6EI

WVARA Vice President