Hi Jerry, On 12/19/18 7:04 PM, Jerry Hancock wrote: > Thanks to all that replied, lots of good info which will take me months to sort through, especially the link to Jürg Kögel looks helpful as well as a note from Bert. > > Attila, Yes, more phase noise than long term though this is really an exercise to get a better understanding of oscillators and measurement techniques. > > The 2n2222 mixer sounds like another H-mode, I’ll have to look at it. It probably uses self-wound, micro-sized bobbins which will be a challenge for me :-]. No, it used off the shelf transformers and the 2N2222A hooked up in diode mode in a ring, just as you would for a DBM, it's home-cooked DBM. Check it out for yourself: https://tf.nist.gov/general/pdf/2554.pdf Do use the NIST Time and Frequency library with all their articles, lots of fun reading ahead! > Bob, I think you were the person who pointed me to the loose PLL a while back. The circuit I am building used a gain of 300ish (30k/100) and I expect that to really clip when unlocked. I have a 10-turn variable in the circuit to bring it close initially. The gain in one stage in itself is not particular interesting, but rather the loops open-loop gain which translates into the bandwidth of the loop. Cheers, Magnus