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I used a 1N4007 in my NC-40 build. More range than the specified varactor. The PIN structure helps. 73, Gary WB6OGD

Another thought:? G0UPL and KD1JV among others are using cheap BS170's in parallel for a very efficient rf power amp in class E (or there-abouts). Would be interesting to try building a class E final

Jerry, That looks like a really fun and quick project. I've got plenty of air variable caps. Any idea what kind of coil to build if you don't have a ferrite rod for a core? Adding this to my list of

I'm assuming most of what people like about the 2n2xx is due to the receiver front end and IF. Anyone have thoughts about what would happen if the 2'd mixer was moved to an SA612? Jerry, KE7ER

Virtually ANY diode will work, some better than others. I have a number of projects where I used a red LED as a varactor. I usually got from low-teens pf to ~50 pf. Smaller ones tended to be better

Hi All, Been reading the mail on Jim's 2N2222 rigs and wanting to create PCBs (for personal use only). I'm thinking of doing one myself as I remember using one of Jims rigs (built by an FPqrp member)

I take that back. Jim's schematics on http://www.k8iqy.com/ still show a three crystal filter with an apparent last update of 2013 The Norcal thing is its own animal. Jerry, KE7ER

Here's an unexpected curiosity for those with way too many LM386's in the junk box. A single chip regenerative receiver. Using only an LM386:

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