October 9 Meeting

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.   

KK6IK.jpeg


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

September Meeting

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

WVARA BBQ on Saturday, August 10

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.

“CQ Field Day CQ Field Day” 2024 ARRL Field Day. We were there!

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.

The mighty 2024 WVARA Field Day Crew
The mighty 2024 WVARA Field Day Crew
GOTA Station
GOTA Station
The CW Tent
The CW Tent
Twilight on Mora Hill
Twilight on Mora Hill
VHF-UHF Tent and antennas
VHF-UHF Tent and antennas
Digital Station VAN, Antennas and Solar Panel Trailer
Digital Station VAN, Antennas and Solar Panel Trailer
CW Quad Antennas
CW Quad Antennas
SSB Tower and 10m, 15m, 20m, 40mYagi, and 80m dipole
SSB Tower and 10m, 15m, 20m, 40mYagi, and 80m dipole

June 12 Meeting

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

May 8th Meeting

Our next WVARA meeting will be held in-person on Wednesday, May 8, 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.  Mark Aaker, K6UFO, will bring us up to speed on how to be more effective at FT8 contesting.  FT8 is the most popular mode for daily operation and DX chasing, and this popularity is now spilling into contesting.  While entering a fast-paced SSB or CW contest can be intimidating, FT8 cycles reduce the frantic pace and are great for the contest newcomer.   And learning to contest in FT8 can gain you DX, improve your daily FT8 skills, and develop skips that will help you in other contests.
After Mark’s presentation, I will review the status of WVARA’s plans for Field Day, which is June 21-23.  We’ll be on Mora Hill and having a blast as usual.

BTW, several of us meet nearbyfor 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

April 10 Meeting


Our next WVARA meeting will be held in-person on Wednesday, April 10, 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.  

At this month’s meeting, Ralph Simpson will tell us about secret radio communications during WW2 and the cracking of Enigma.  WW1 had been the first war to use radio, which was an enormous advantage on the battlefield. But the weakness of existing ciphers meant every country now had their secret messages broken by the enemy! This vulnerability was the driving force for the invention of more advanced machine ciphers and was the beginning of crypto warfare. The Enigma machine was invented during this time and was the first cipher device to use electricity. So, radio was directly responsible for the resulting explosion of crypto warfare, which continues to this day.

The Nazis used the Enigma in WW2 and had the utmost confidence in the secrecy of their messages, despite evidence of enemy codebreaking. The story of Allied codebreaking during WW2 is a story of innovation, intrigue, and deception. The success of cracking the Enigma was kept secret for 41 years, until 1974, despite tens of thousands of people working on the effort in the UK and US. This secrecy is especially incredible for us living in the age of the internet, WikiLeaks, and Edward Snowden. Over 35,000 Enigma machines were manufactured, but only 400 exist today.

Ralph Simpson worked in the computer industry for 32 years, working for IBM and Cisco Systems. He started as a systems engineer for large mainframe computers and held a variety of technical and management roles. He retired as Senior Director for Service Strategy at Cisco Systems.  Ralph is now retired and volunteers at History San Jose and the Computer History Museum. He wrote a book on cipher history called, Crypto Wars: 2000 Years of Cipher Evolution. He is also an avid collector of cipher machines, which you can see on his website, CipherHistory.com

BTW, several of us meet nearbyfor 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

POTA (Parks On The Air) January 10, 2024 Meeting Presentations

Many thanks to Clay and Scott for their excellent presentations about POTA (Parks On The Air) at our January meeting.   There were lots of engaging questions from our enthusiastic crowd.  

Discussions are now afoot for a WVARA POTA activation sometime this spring — maybe from a local state beach.  We’ll keep you posted as plans develop so you can get involved!

Clay Cougar POTA Presentation, What is Parks on the Air (POTA)?

Scott KK6IK POTA Experience, POTA ACTIVATIONS
& LESSONS LEARNED (SOFAR).

W6PIY