I have run a couple of quick tests on the ugly VFO. It covers 6.62MHz to 6.73MHz, somewhat wider and lower than its 7.0MHz to 7.1MHz design range. But since this was just a test piece, I had not bothered to include any trimmer capacitors to adjust this.
Stability was a bit variable. In two 15 minute tests, I got drift of 40Hz and 350Hz respectively. I am glad there is a bit of drift; when I add the "huff and puff" stabiliser, it should be clear whether or not it improves things.
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Did some testing with the IMD Meter in my garden near my HF antenna. Field strength was either zero or full scale. IMD was either 'no ...
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Here it is, a combination of the "Practical 7MHz Hartley Oscillator" from Experimental Methods in RF Design (page 4.3) and a buffe...
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