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I'm curious how the 1n4001 compares with purpose built varactor diodes. Figure 3 here shows it going from about 20 to 5 pf as the reverse voltage goes from 0 to 10 volts.

Mike, Very cool! I'm trying to get dangerous with Kicad as well, it's a serious set of tools. Being retired now, I no longer have access to the schematic editor and PADS PCB board layout program that

clearer comparison:

About SMT....... IF you despise SMT crumbs (as I do)? and would rather SEE what you are playing with then I suggest the higher power devices.... like for resistors... instead of using itsybitsy 0805

It saves and displays just fine here. Nice work.

Here's what I have so far. Hopefully this will be legible as an inline image. I'm a Kicad noob, so be gentle :) I used Jim's original design with the roll-your-own mixers. This is the receiver only.

Hey Chuck..... what does this mean.... "All stabilized at room temperature for measurement."

For my own amazement, measured for comparison two diodes, MVAM109 and BB910. A schematic of the N5IB design?test fixture** is attached. All stabilized at room temperature for measurement.

THANK YOU KB3BYT

Howard, On second thought, your modules could be a fine way to teach radio. Modules start to make a lot of sense as radios become more complex. Many who design radios for a career have created their

That bitx20 thread on the ADE-1-24 is rather confusing. And to some extent, so is the ADE-1 datasheet: https://www.minicircuits.com/pdfs/ADE-1.pdf The ADE-1 pins are numbered like a DIP IC, pins 1,2,3

Primary attraction of this rig is the "back to basics" analog design, nothing hidden in IC's. An LM386 for the audio amp is simple, works from 5-15 volts, but is not for the audiophile. From

Thanks Jerry. I spent some time this morning looking at the different versions of this rig, from the original to the Norcal version. The first thing that struck me was how crowded and complex the

Looks like they were made by MiniCircuits as a custom build for a customer in 2006: /g/BITX20/topic/4104916#17354 Other posts in that thread indicate that they are pretty much

OK, last time, I promise. Jerry and All, I?expect we've been thinking grapefruit and tangerines...related but not the same...8^) Varactors used to tune an entire?AM or FM band?with a max C of 350pF

I am curious as to the possible substitution of the mini circuits ADE-1 with imported ADE-1-24 devices.? The look of the two seemed to be identical.? Has anyone found success with the latter??

The Raduino used on the uBitx consists entirely of a 5v regulator, an Arduino Nano clone, an Si5351, and a standard 16x2 LCD with backlight. Power consumption is 40ma without the display, the display

[email protected]> wrote: Ack! Not me! I have a day job :) Do you know what the power supply current requirements would be for the synthesizer, LCD and Arduino? I still marvel at my SW40+ that uses

Sold.