[sdiy] DC-1 MHz, through-zero FM, controlled, oscillator without core capacitor

[cheater cheater]

what is the minimal analog implementation of a PLL that would be
useful for taming a varactor based oscillator, while retaining ability
to do audio rate frequency modulation?

On Wed, Dec 3, 2025 at 9:09 AM Jonatan Liljedahl <lijon at kymatica.com> wrote:
>
> tis 2 dec. 2025 kl. 22:49 skrev Donald Tillman <don at till.com>:
>>
>>
>> It's also exactly how Morse code radio is received.  (Morse code radio does not transmit beeps.  The beeps are at the receiver where the local oscillator mixes with the received RF signal.)
>
>
> Not only morse code (CW) but also single side-band transmission (SSB), which is standard in HF radio. It uses half the bandwidth of AM, and also potentially it needs less power than AM since the carrier doesn't have to be transmitted.