Re: DSB transceiver for Digital mode
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Pulling with NP0 capacitors will not generate too much stability issue. Normally inductors are drifting much. However, you are correct that 20m crystal is more unstable, but with the heating solution, it is much better and it won't have problem to make QSO. Adding heating resistor does have limitations, for example, if you use with car battery, the voltage varies with charging and the crystal frequency will vary as well. That's why we need regulated power supply or battery pack.
I customize all the crystals from a reliable supplier.My crystals for KN-Q7A, CS-series, CRK-10A all come from them.
I have all the parts ready and ready to ship hundreds of kits now. The first batch is 350 kits. Let's see how soon it will be gone.
On Thu, May 9, 2019 at 6:50 AM Ron Stone <rsstone2@...> wrote: