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A Secret Little Adventure Ham Radio Blog

DIY 49:1 Unun Impedance Transformer For End-Fed Half Wave (EFWH) Antenna (Step-by-Step Instructions)

February 14, 2022 by KM1NDY

The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose. Please note that I will not be …

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A Ham Radio Valentine’s Day

February 21, 2021 by KM1NDY

Oddly, WX1MAR and I celebrated Valentine’s Day this year. Odd because, well, in 27 years we have almost never celebrated Valentine’s Day… But! We had a great excuse! I had secured callsign K1S (get it?) for the “Happy Hams Valentine’s Day” special event station. And since February 14th was a Sunday this year, it meant …

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K1S – “Happy Hams Valentine’s Day” Special Event Station

February 13, 2021 by KM1NDY

WX1MAR and I will be getting on the air tomorrow for Valentine’s Day. We hope all of you ham radio operators track us down. Because, it means you will get a valentine as a qsl! 73s and 88s!

Antenna Modeling, Radiation Patterns, Geography…and the Caboose

February 11, 2021 by KM1NDY

Antenna modeling for the amateur radio hobbyist has always struck me as uniquely esoteric. I mean sure, hams build plenty of antennas, but we have all seen the predicted idealized radiation blobs, donuts, and figure-eights associated with the usual dipoles and end-feds. We know that for typical HF wire antennas, the closer to the ground, …

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Peaked Mountain – 2021’s First SOTA Point

February 7, 2021 by KM1NDY

The first summit of the 2021 is actually an old friend — Peaked Mountain in Monson, Massachusetts. Well-traveled, the short 1 mile summit trail consisted of a few inches of hard-packed snow, making microspikes the choice footwear accessory. Especially given that temperatures creeped above freezing most of the day, assuring a slick refreeze for our …

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So Close, But So Far: Hunting The Continuous Radio Wave

February 5, 2021 by KM1NDY

Sitting here listening to the city sounds on my handheld scanner, I’m just grateful there are *some* circulating radio waves I’m able to capture…because my attempt tonight to become a CW partner was an exercise in futility. A radio club buddy of mine reached out about scheduling a regular slow speed morse code rag chew. …

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Winter Field Day ’21: Go To The Back Of The Train!

January 31, 2021 by KM1NDY

Working Winter Field Day 2021 from an early 1900s train caboose seemed the perfect way to abandon the trials of modern life at least for a weekend. Fortunately, the Chester Railway Station and Museum in Western Massachusetts offered just the ticket for WX1MAR and I. And Dave, the station’s highly knowledgeable proprietor and overall sweetheart, …

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Got me in an antenna kinda mood…

January 27, 2021 by KM1NDY

…but the info void on transmission line transformers brings me down. Baluns & ununs stay voodoo for now.

WX1MAR is now “Stroke Alpha Echo”

January 23, 2021 by KM1NDY

Congratulations Marc WX1MAR for passing your Amateur Extra exam today! You can now hang with us big kids on the *other* side of the bands! Great job!

Me & The Mysterious World of Ham Radio Satellites

January 22, 2021 by KM1NDY

Well it appears the only amateur radio satellite I’ve ever managed to contact may now be out of commission. Or taking a nap. Apparently AO-91’s battery is going down the tubes and the transmitter has been turned off. On the flip side, this screenshot is of the first satellite status report I ever submitted to …

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