Short Update…

Wanted to mention what I found by comparing the molded inductor verse the use of a toroid for the RF Phase Shift.

Found that the molded inductor (molded inductor for the primary and four turns of hook-up wire for the secondary) has at least a 10 dBm loss at 7 MHz. I wound a toroid for the same component with ten turns for the primary and four turns for the secondary on a FT37-61 and had only a 2.8 dBm loss at 7 Mhz. So, using the toroid is the better choice. But, modeling this new insight with LTSpice still leaves me with some doubt. The RF level going into the Detector stage is still not up to 700mv which I think would be necessary for good sensitivity. I doubt I will continue on with this project in its present form. Still have some desire to use the LO ceramic osc and hook it up to a homebrew NE602/LM386 receiver I build a few years ago to see if that would work.

Have discovered some really interesting functions for LTSpice…things I wish I had known years ago. ┬áStill learning how to set-up sources for driving oscillators, mixers, etc and what types of analysis’s tell me what type of information. This learning has turned out to be more fun that I first imagined!

With the fourth just around the corner, I doubt I will get much done till next week. I have started to do the 30 meter mod for my KX1 and also want to do the auto tuner kit while I am in the kit building mood.

Hope everyone has a good and safe Fourth of July weekend!

72/73…Mikey, WB8ICN

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