Liste des Groupes | Revenir à se design |
Jan Panteltje <alien@comet.invalid> wrote:
>
[...] >
https://panteltje.nl/pub/audio_90_degrees_phase_shifter_circuit_diagram_
IMG_6958.JPG
>Thst is a 90 degrees phase shifter over the speech audio range for>
generating I and Q signals for SSB modulation. design is not mine, used
trimpots to test it :-)
After reading through some back issues of 'Rad Com', I had been thinking
along similar lines for generating SSB. I was also intrigued by the
Weaver method and wondered if modern multi-stage filters between the
inverted and non-inverted audio sidebands could reduce the audio notch
effect and allow a wider frequency response.
>
I let my licence lapse many years ago and had been thinking about taking
it out again before the call-sign got issued to someone else. The
problem is that they need to see my certificate to prove I passed the
Radio Amateurs' Exam and I don't know where to find it.
Les messages affichés proviennent d'usenet.