Hi Johnny, That's right - 13.5 feet. Though for a situation that would never not in real life. Throw in the more realistic duty cycle, feedline loss, cloud warming antenna pattern, etc, and it's much

Had some "nothing to do" time today so decided to spend a few quality minutes performing my "due diligence" with the ARRL's RF Exposure Caculator at http://arrl.org/rf-exposure-calculator I ran four c

Check out the Little League World Series on ESPN Just heard a player profile... the Tennessee shortstop/pitcher, Ryan Pearson, is KN4VKW. Send that young man a QSL card! Jim, N5IB

With the weekend's experiments showing a continuously variable inductance is reasonably possible, it's now time to see how to make the differential capacitor. Photo attached of a first "proof of conce

Results of some experiments with variable inductance: Test coil - 24 turns AWG22, 1" diameter, 1.4" long (~17 turns per inch) wound on a "natural" PLA 3D printed coil form (photo attached) L = 7.4 uH,

Jerry commented yesterday, "Does anyone see a roller inductor in the making???" That's most likely well beyond my 3D skillset, and making the reliable moving contacts would be a real challenge. But a

Hi Lloyd, I'm CPU limited and can't run the better CAD packages like Fusion360. So I've been using TinkerCad on-line, and it's been sufficient for most things I've needed. With Ultimaker Cura 4.6.2 as

Thanks, Johnny, Didn't notice the photo was blurry... here's a better one Jim, N5IB

Hi David, Here's the STL file, attached, and a photo. It's such a thin tube it needs a "brim" for buildplate adhesion There's a tiny hole at each end to pass the wire through to secure the turns. I pl

With too much free time for my own good, I did an experiment with 3D printing some spiral grooved coil forms. I was curious if the PLA plastic material used to print would degrade the Q of the coil. 1

I'm portable at an undisclosed location... using the protototype Bayou Jumper... so NCS,... please listen down around 7121.7 N5IB

#cal-reminder

You can just treat the via like soldering a component pad, but without the wire lead. But it's really a belt-and-suspenders kind of thing. If you're not comfortable with it, you can skip that step wit

I was in the garden center at the local Lowes store yesterday and noticed some interesting possibilities for antenna projects in the bin of tree and tomato stakes. This one in particular looked useful

The LC meter feature would be a great addition to a Test Set. If an Arduino or just a bare ATMega328 is being used to control it, adding the LC meter feature wouldn't be hard. I did one as a "proof of

Hi Ed, Since a regen is most sensitive and selective right at the onset of oscillations your detector is doing its job and its level is good. Are your red/green LEDs working correctly? They consume 10

I'll be at the cabin in the woods in north Georgia and will try to check in with the prototype Bayou Jumper and a vertical dipole. My crystal puts me around 7121.7, so keep those filters WIDE - hi Jim

#cal-reminder

I can also now confirm that https://www.thingiverse.com/thing:4298479 is a nicely fitting BNC connector cap to 3D print Have three of them on the K2 now Jim, N5IB

Thanks for posting that, Jim. I just printed a couple of them, and can confirm it fits the 4 pin mic jack, as well as the 8-pins on my K2 and TS-430S, and of course, the SO-239. I found a BNC cap on T

For the lucky op who scored Jerry's stash... The SAVXO can be used with the Bayou Jumper. The SAVXO manual has info about adapting it to the SS-40, and that Tx is identical to the Tx section of the BJ

Here's some info passed along from Dave, W3BJG .... "When I went to Hobby Lobby and entered the part number for the wooden box,SKU 288743S, I too found that it was no longer available. In snooping aro