NanoVNA and checking a common mode choke
Last week a new toy arrived a Nanovna and I have been playing around with it and learning the ins and outs of the unit. This unit allows me to check antenna SWR, attenuation and coax switch isolation to name a few things. I am not going to get into the details of the Nanovna as there is lots of information for those interested available on the internet. My first project was to check the attenuation on one of the common mode chokes I made. It was made from RG316 coax, FT 240-31 mix toroid and had 10 turns on it. I never put this common mode choke through any testing as I did not have anything to test it. I was going by some charts, the type of toroid mix and the number of turns needed for 40m to 10m.
Now that I had a Nanovna I could perform an attenuation test on the common mode choke I was using and see some actual numbers. I have been reading and -30dB or more across 40m-10m is great for a common mode choke. I calibrated the Nanovna and performed an attenuation test and to my surprise, the common mode choke I made failed! The common mode choke I made was above -30dB from 40m to 10m. It was not time to fix the problem and bring my readings below -30dB.
I tried reducing the windings around the core increasing them and doing a Nanovna sweep each time to see the results. My final result was 14 windings and that gave me the ideal results. The Nanovna indicated -35dB on a full band sweep (6.5MHz to 30MHz) on individual band sweeps the readings were 10m -44dB, 15m -34.5dB, 20m -35dB and 40m -35dB. I am much more pleased with these readings.
| Full band sweep |
The software to display the readings is called Nanovna saver, it's free and works great. I am very pleased with the results from the Nanovna and I was able to check and fix my common mode choke. I will now move on to the next project and that is the isolation between antenna 1 and 2 on my LDG AT200pro2 but more on that in another post.
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].
Fraser Does Pikes Peak
Pikes Peak is a great summit for a SOTA activation. You can hike up, drive up, or take the cog railway to get to the top. Pikes towers over eastern Colorado and has an excellent radio horizon in all directions. It is easy to work a bunch of stations on 2m FM. With a bit of effort, you can work Kansas, Nebraska, Wyoming, and New Mexico on VHF.
Fraser/MM0EFI was visiting from Scotland, operating here in the US as W0/M0EFI. Here’s his HF operating experience, with cameo appearances by Carey/KX0R, Christian/F4WBN, Elliot/K6EL, and Steve/WG0AT.
Now for the VHF fun on 2m FM. I happened to be on South Monarch Ridge (W0C/SP-058) that day and we completed a Summit-to-Summit contact on 146.52 MHz, at a distance of about 80 miles—easy contact using just HT’s on both ends.
Fraser, thanks for the fun videos from America’s Mountain.
73 Bob K0NR
The post Fraser Does Pikes Peak appeared first on The KØNR Radio Site.
Bob Witte, KØNR, is a regular contributor to AmateurRadio.com and writes from Colorado, USA. Contact him at [email protected].
Amateur Radio Weekly – Issue 323
2024 ARRL Field Day Theme: Be Radio Active
The theme encourages Radio Amateurs to take advantage of the peak of Solar Cycle 25.
ARRL
Installing VARA on Debian 12 Linux
I thought it best to document it here, and maybe help another poor lost soul.
The Modern Ham
QLog
A cross-platform logging app with rig control, cluster, WSJT-X support, and more.
OK1MLG
Girl Scouts gear up to talk to International Space Station
Here’s how they’ll do it.
The Sacramento Bee
My ATU is soooo good, it will give a perfect match on anything
Even without an antenna connected.
owenduffy.net
CATS APRS alternative featured on Hackaday
CATS uses raw FSK rather than the inefficient AFSK used by APRS.
Hackaday
Low band VHF tests in Western Australia
The frequencies were 30.8761 MHz , 36.6073 MHz, 39.1467 MHz and 40.6864 MHz.
EI7GL
How I do it: A complete POTA activation from start to finish
Watch me, in real time, as I deploy an end fed half wave antenna, set up my station on a picnic table, and do a QRP (5 watt) POTA activation on the 15 meter band.
KB8VBR
Handmade QSLs from the 1930s
Hams would purchase post cards from the post office (only a penny each, including postage!) and created their own designs.
KB6NU
Source of major RFI identified
You may note that it is at least 5,9+10dB.
Johnson’s Techworld
APRS RX comparison
Anytone 878 vs Yaesu FT-5DR.
W0RMT
Video
Portable DIY adjustable 2m J-Pole
Peel and stick some metal tape on a strap, cut out a J-Pole pattern.
VA5MUD
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Amateur Radio Weekly is curated by Cale Mooth K4HCK. Sign up free to receive ham radio's most relevant news, projects, technology and events by e-mail each week at http://www.hamweekly.com.
LHS Episode #536: The Weekender CXIV
Listen Now
Spin the Random Topic Wheel (Segment 1)
- Using Call Sign Prefixes and Suffixes
This Weekend in Hedonism (Segment 2)
Cheryl’s Recipe Corner!
Irish Cream
Description
Russ and I occasionally venture into the world of making flavored liquor (like Amaretto, Kahlua, etc). While we have not ventured into Irish Cream, YET, this is a recipe that has been stashed backed with tons of fantastic reviews. It is definitely a recipe open to alterations. And, taste as you go… it might be too sweet for your preference. Only add 1 can sweetened condensed milk originally, then add more as you deem necessary
Ingredients
1 (750 milliliter) bottle Irish whiskey (You can substitute bourbon or brandy for the liquor, if you so choose. Or use some flavored Crown Royal, maybe splitting it with something else… or using up an almost empty bottle)
10 ounces melted milk chocolate chips (you can substitute butterscotch, peanut butter or vanilla chips; if using semi-sweet or dark chocolate chips, it will make the Irish Cream less sweet; or use 3-4 tablespoons chocolate syrup)
1 or 2 (14 ounce) cans sweetened condensed milk
2 (12 fluid ounce) cans evaporated milk
2-1/2 cups heavy cream
1/4 teaspoon instant coffee granules (or 1/2 cup of double strength brewed coffee)
1 Tablespoon Pure Vanilla Extract
1 Teaspoon Almond Extract
Directions
Pour a small amount of whiskey into a large bowl. In the top of a double boiler, melt chocolate, stirring constantly until smooth (skip this step if using chocolate syrup. To skip double boiler completely, heat a small amount of milk with chocolate chips in the microwave until melted, in 10-15 second increments between stirring. WATCH CAREFULLY to keep from scorching). Mix melted chocolate with whiskey in the bowl. Gradually stir in sweetened condensed milk and evaporated milk. Stir in cream, instant coffee granules (or brewed coffee), and remaining whiskey. Pour mixture into three 750-milliliter bottles, seal, and store in the refrigerator. Let rest, without consuming, for at least 1 month before use. Gently shake bottle every few days to keep everything mixed up. To serve: shake the bottle well; serve in small glasses over crushed ice. Yield: 3 750-milliliter bottles
Cheryl’s Mixed Drink Corner
Bailey’s Mint Martini
Description
To celebrate St. Patrick’s Day, enjoy this tasty minty concoction!
Ingredients
1 ounce Baileys Irish Cream
1 ounce green Creme de Menthe liqueur
1 ounce vodka
1 ounce half & half
Ice
Whipped Cream - Optional
Chocolate Shavings (or crumbled chocolate cookies) - Optional
Directions
Fill cocktail shaker with ice. Add ingredients; cover and shake well. Strain into a martini glass. Garnish with whipped cream and chocolate shavings as desired.
Russ’s Drink Corner
Writer’s Tears Copper Pot Irish Whiskey
Description
Writers’ Tears is a unique marriage of Aged Single Pot Still and Single Malt Irish whiskey. Distilled entirely from barley, both malted and unmalted, this is a truly special Irish Whiskey. Writers’ Tears is triple distilled, non-peated and matured in Flame Charred American Oak bourbon casks. An award-winning whiskey that has also been included in Ian Buxton’s publication “101 Whiskeys to try before you die”.
Details
Mashbill: 60% malted barley, 40% barley
Proof: 80 (40% ABV)
Region: Carlow, Ireland
Color: Pure honey
Nose: Sugar, vanilla, confectionary sweets, malt, cream, touch of cinnamon
Taste: Malt, sweet cream, vanilla, sugar cookies, light berry sweetness
Finish: Soft sugary sweetness, hints of chocolate and vanilla
Price: $45 (750ml)
Rating: 86
Bill’s Whatever Corner
Clonakilty Distillery - Minke Irish Gin
43.6% ABV – 700mL
Minke Irish Gin is a juniper based, citrus forward gin. Distilled from whey for a smooth, velvety mouthfeel. Every drop is distilled in our copper pot still. Minke Irish Gin was Awarded “Best Classic Irish Gin” at the World Gin Awards 2023. Inspired by the Minke Whale, the majestic creatures that swim wild off our Atlantic Ocean coastline. The same coastline that we forage our unique botanical Rock Samphire (https://en.wikipedia.org/wiki/Samphire)), which is sustainably harvested along our Atlantic cliffs. This is harvested only by hand and only when in season.
Clonakilty Distillery - Port Cask Whiskey
43.6% ABV – 700mL
Clonakilty Port Cask stands out as a truly exceptional expression within Clonakilty’s cask series. This is a mature premium blend of single grain and Clonakilty Distillery’s Single Pot Still whiskey, which was named World’s Best Irish New Make Single Pot Still at the World Whiskies Awards in 2020. Clonakilty Port Cask is matured in a combination of ex-bourbon, and Ruby and Tawny port casks from the Douro Valley. This exquisite whiskey showcases a fusion of Irish whiskey with the delicate and nuanced influence of port.
Segment 3 (Announcements & Feedback)
Hamvention 2024 Fundraiser
Source: https://lhs.fyi/hv2024
Segment 4 (New Subscribers, New Supporters & Live Participants)
Subscribers and Patreons
Chuck Hailbronner
Facebook
Hal NineThousand
Twitter
@KiloDeltaNiner
Instagram
grumpeur
Mastodon
@LS5BAT
@fedelapena
@shtrom
Mailing List
KB3BMT
Discord
Ausmus47
tuxclaw
Not The Daddy
HAL9000
Greg
Ellen
Live Chat
Darren, VK6EK
Mike, K6GTE
Ted, WA0EIR
Tony, K4XSS
Connor, KD9LSV
Joel, KC0YEW
Tom, N4HAI
Jill, K1TTZ
Alex, N7SM
neimandem
Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].
ICQ Podcast Episode 425 – Getting Ready For Successful Portable Operation
In this episode, we join Martin Butler M1MRB, Chris Howard (M0TCH), Bill Barnes (WC3B) and Leslie Butterfields (G0CIB) to discuss the latest Amateur / Ham Radio news. Colin Butler (M6BOY) rounds up the news in brief and the episode's feature is Getting Ready For Successful Portable Operation.
We would like to thank an our monthly and annual subscription donors for keeping the podcast advert free. To donate, please visit - http://www.icqpodcast.com/donate
- Bob Heil, K9EID, Silent Key
- YLRL Celebrates International Women's Day with Special Event
- ARISS Celebrates 40 Years of Hams on the Radio Space
- Lunar Lander Still Functions Despite Landing Issues
- UK Amateurs Start to Use New Privileges
- Brandmeister Adds TETRA Based Network
- Applications open for YOTA Czechia
- Pop-Up Net Celebrates National Pi Day
Colin Butler, M6BOY, is the host of the ICQ Podcast, a weekly radio show about Amateur Radio. Contact him at [email protected].
LHS Episode #535: Saturday in the Park
Hello and welcome to the 535th installment of LInux in the Ham Shack. In this short topics episode, the hosts cover changes to the Parks on the Air (POTA) program, HDMI's AMD denial, the passing of ham radio icon, Bob Heil (K9EID), KDE's new mega release, SDRtrunk and much more. Thanks for listening and have a great week.
73 de The LHS Crew
Russ Woodman, K5TUX, co-hosts the Linux in the Ham Shack podcast which is available for download in both MP3 and OGG audio format. Contact him at [email protected].
Amateur Radio Weekly – Issue 322
Bob Heil, K9EID, Silent Key
Heil was known as a mentor who enjoyed helping others find success in Ham Radio.
ARRL
America’s last Morse-Code station
The Radio Squirrels keep the tradition alive.
The Atlantic
EchoLink Web
An edition of EchoLink that runs entirely within a Web browser.
EchoLink
At peace with Amateur Radio over Internet
Internet is so integral to the current generation that any communications technology that doesn’t incorporate Internet to some degree might be perceived as irrelevant.
Zero Retries
New Amateur Radio newsletter
An emphasis on radio experiments and the VHF bands.
EI7GL
First SOTA activation
My furthest contact was with Z36T in The Republic of North Macedonia at 1501 miles.
GM5ALX
Restoring a mystery key
It didn’t have any markings on it and the seller said he thinks it was home made.
QRPer
Installing your Ham Radio mobile antenna on a vehicle
We will explore everything from the simplest configuration to the most complex.
OnAllBands
Winlink wishlist
Have officially supported clients for Mac and Linux.
W0RMT
Video
D75 versus FT5
Let’s take a look at the Kenwood TH-D75 radio compared to the Yaesu FT5.
KM4ACK
Hidden APRS Igate in your Yaesu mobile radio
Plug your radio into your PC or Raspberry Pi and install Ygate.
KM6LYW
ARRL DX Contest from the nuclear bunker
We return to the nuclear bunker on the North York Moors UK.
ianxfs
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Amateur Radio Weekly is curated by Cale Mooth K4HCK. Sign up free to receive ham radio's most relevant news, projects, technology and events by e-mail each week at http://www.hamweekly.com.
















