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Seeing a forward voltage of 12v applied across a 1n4001 got my attention as well. From the webpage:? "NOTE: the voltages measured are at the wiper of the potentiometer, which is NOT now the voltage

It IS. The "combined" graph had a hover feature to show forward bias voltage, but it isn't working for me either... if I am not mistaken... 73, Gary WB6OGD

Hi All, I gotta ask... How can you forward bias a 1N4007 diode greater than 0.6 volts? I must be missing something? Diz

Thanks Richard, I think Santa is bringing me a NanoVNA. I'm looking forward to learning what it can do for me. Cheers, Paul VA3ZC

Read the Info from Hans, http://hanssummers.com/varicap/varicapfwd.html And especially this comment with calculations at the bottom...(Jerry) *Adam SQ5RWQ * Note that connecting two LEDs in series

Steve, It's been over 20 years, but the original info is still on my qsl web page http://qsl.net/kf4trd. You are welcome to print and use the info as you wish, just not for profit. Good luck Mike

Eric, Good info, makes sense when you relate the shape to functional applications.? On the O/T about the capacitor plates.? In my Vast Experience (or maybe Half-) I knew that tapered plate style as

5% is 1.45uH so 0.6uH is well within tolerance. I've been analysing a 20m LPF with my NanoVNA and I found I had to remove a total of 4 turns off the 3 toroids to get a decent return loss and minimise

One good reason to use teflon as a capacitor dielectric, it's easy to know when it has failed. Search for the word "explosively" in this discussion:

QRPp journal Vol. IV No. 3 Cheers, Mark.

Kurt is onto something with "no solder". Tin-lead solder has 10x the resistivity of copper, tin-silver is not much better: http://eddy-current.com/conductivity-of-metals-sorted-by-resistivity/ More of

No solder...rule number one. Rule number two...no metal other than the loop and coupler. As far as stability. Great point and I can’t yet speak to power more than qrp. It works fine for qrp. As far

I understand that their used to be a "Elmer 101" box available.? My little Builders group is going to be building SWxx's soon and would like to get a hold of this book for the builders.? Anyone have

Looks like teflon has a sufficiently low loss tangent, is being used successfully as a dielectric on mag loops. I'm sure a vacuum for the dielectric is preferred, but nothing costs way too much. Could

Hello Jerry, There is more to this capacitor than meets the eye...but at its basics it is indeed controlled separation as a tuning mechanism...but dialectic choice is very important. Your formica

Hey, Jerry, Those are all great ideas...until you try them. :) Mag loops don't work (well) unless we build them in ways that only mag loops require. Overlapping strip capacitors, as you describe,

I don't see anything recognizable as a cap in that photo, am curious how you are going about it. Best guess is it's the metalic assembly above the PC board with coax in, a white wire coming out. And

Thanks to all your replies. There is a lot of valuable information. This is my first toroid and I want to make sure I have it right. I'm winding T3 which is an FT37-61 with 23 turns of #28 and 6 turns

Hello all, I’m working on a prototype for a low cost magloop. ?Cost of ALL parts including WiFi/low energy Bluetooth “arduino-based” electronics and mechanical assembly for driving the

Correction, at 9v the 1n4001 graph shows 10pf, not 30pf: wrong:? ?Using the midrange 9v:30pf pair to compute? ?K = 10*sqrt(9) = 30, right:? ? ?Using the midrange 9v:10pf pair to compute? ?K =