formatting link
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.