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A Secret Little Adventure Ham Radio Blog

Cutting All Ties, Or How The DIY Isolation Transformer Enables Oscilloscope Probing of Bridge Diode And Other Rectifiers (This One Is A Doozy!!!)

November 29, 2024 by KM1NDY

Having accomplished my stated goal of eating my way through Thanksgiving, now thoroughly satiated, I am finding myself eager to get back to this blog post. One of the first things that comes to mind is why am I bothering with any of this? Oh, don’t get me wrong, I immensely enjoy the subject matter …

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JFET Common Source Amplifier Circuit Analysis Laboratory (Nothing More Than A Mental Exercise)

November 3, 2024 by KM1NDY

Much like many items on this secret little site, there is no particular purpose to writing this laboratory report. Often these posts are simply mental exercises, helping me work through concepts, ideas, and projects. This website exists exclusively for my own pleasure. The ability to construct words on a page, arrange photographs at will, and …

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Hey Good Lookin’! 20 Meter Propagation To Europe For CQWW SSB Ham Radio Contest

October 26, 2024 by KM1NDY

Hoping my radio waves make the most of the salt water tomorrow on their way off to foreign lands. I’ve heard the sun may be coughing up a fireball (a.k.a. a coronal mass ejection). This picture shows the stations receiving my 200mW 20M WSPR signal from my home QTH from 1:00 to 4:00 UTC (9pm …

Hobo Ham Radio: Trashing Up The Airwaves

October 14, 2024 by KM1NDY

I lost my Nellie eighteen months ago. We had our secret spot along a tidal river. Perhaps you remember some of the old stories I told? Nellie learned a lot about life on these banks. And so did I. My new canine pal came into our life very shortly after the passing of Nellie. A …

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Catching The Full Wave: Bridge Rectifier On The Oscilloscope

November 30, 2024 by KM1NDY

As my ham radio journey takes me on a more formal study of electricity, my home laboratory grows. I remember purchasing the Tektronix 2465 a few years back on a suggestion of a friend, not having a clue what I was doing with it. I just knew that real electronics enthusiasts had an oscilloscope. Now …

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…And Now The Little Ham Radio Workshop Is Starting To Become An Electronics/RF Lab…

August 27, 2024 by KM1NDY

From Top to Bottom: Not shown are my RigExpert VNAs, the NanoVNA, the Koolertron 60MHz function generator, the Tacklife 30V 5A variable DC power supply, and handheld digital multi- and LCR meters. On the bench is the Weller WE1010NA soldering station. Oh yeah, and my Elegoo 3D printer. I think its turning into a proper …

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¡Holy Tamale! This DIY Breadboard AM Radio Receiver Actually Works…(Video)

August 2, 2024 by KM1NDY

It was not all that long ago that I tried unsuccessfully once again to make an AM radio receiver from discreet components and an LM386 low voltage power amplifier. Well, apparently the fifth time is a charm…because THIS ONE WORKS!!! As you can see in the video and pics below, there are only really a …

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…Still Going…

August 1, 2024 by KM1NDY

DIY RF Field Strength Meter / Detector With Audible, Visual, And Digital Indicators (Based on 555 Timer And Simple Parts)

July 25, 2024 by KM1NDY

This was a little rabbit hole. On some amateur radio forum somewhere someone mentioned the MFJ-802B RF Field Strength Meter. This piqued my interest because I had not realized that a field strength meter was a consumer accessible device. Turns out there are all sorts of RF meters and detectors available to purchase. Who knew? …

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Dear Diary: ARRL Field Day 2024 (Equipment Checklist Download Included!)

June 29, 2024 by KM1NDY

Scroll to the bottom if you are only interested in the FD checklist! Is Field Day worth it? This year, more than any other, it seems this question was popping up on ham radio forums across the internet. Other versions seem to be what is the relevance of FD in the day and age of …

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