Has anyone any simple hardware designs for a continuously variable phase shifters for these frequencies. A varicap and tuned circuit is a bit messy at 137kHz and I/Q generation gets complicated imple
Hello all, if PSK is done by choosing an appropriate continuous base band impulse form (raised Cosine, Gauss or Sinc) and modulating the phase at constant envelope (CPM), then the spectrum of PSK rap
Hi All, Class C, D, and E amplifiers are not that hard to modulate. Rather than do anything so drastic as tinkering with PWM in the RF driver stages, apply PWM methods to the power supply for the fin
We're thinking along the same lines. I tried a PWM modulator a few months ago - it is shown in the latest LF experimenters book - but this required an 8 bit digital input for the PWM. It could modula
If one is serious enough about civilized PSK sidebands to consider linear amplification-- which is no trivial matter at the "California kilowatt" levels being discussed here lately-- why not simply t
Andy G4JNT and others, Some comments on grappling with PSK keying clicks: considering the key click problem when using BPSK with switching transmitters. Traditionally, amplitude shaping is >used to l
