It looks like we think a lot alike. A friend was watching me pull parts off old board and asked me why I bothered. I told him that in the last hour I'd pulled off about $400 worth of parts that I might use, and that was pretty good wages.
Great videos always very interesting I am also a radio ham like you, I have a hp8922 test set, that runs from 10-1000mhz but the spec analyser has only a 10mhz span, Do you think using a mixer to get the spec an to go below 10mhz would Work ok and use a pre-amp to match the level, or is there a better way to do this, Thanks Dave 2E0DMB
It would be interesting to use a lower frequency and look at the output with a scope to see exactly what they are doing. I suspect it is a sine-cosine type situation like a full wave rectifier where you input a frequency and the output is the cosine frequency which is double but offset to one polarity. If it is not filtered it delivers a quite strong double frequency. That 14db loss is atrocious!
I have always wondered……. On parts such as this why doesn’t the manufacturer inner connect those common pins (such as the inputs on the device in the vid) to reduce the connections, PCB drill points, etc. for the end user?
The algorithm suggested you, and you started with a steve1989mre meme. I'm in and subbed after watching
Regarding 4:42, I believe the purpose of that 90 degree phase shifter, is to cancel out the difference term and only leave the sum term in the output.
It looks like we think a lot alike. A friend was watching me pull parts off old board and asked me why I bothered. I told him that in the last hour I'd pulled off about $400 worth of parts that I might use, and that was pretty good wages.
I want to know how the magic 90 degree phase shifter works over a wide frequency range ... The multipliers I've seen are diode based rectifiers.
The harmonics proportion also get multiplied
Thanks 😁
Great videos always very interesting I am also a radio ham like you,
I have a hp8922 test set, that runs from 10-1000mhz but the spec analyser has only a 10mhz span,
Do you think using a mixer to get the spec an to go below 10mhz would
Work ok and use a pre-amp to match the level, or is there a better way to do this,
Thanks Dave 2E0DMB
Really wanted to see the output in the time domain.
It would be interesting to use a lower frequency and look at the output with a scope to see exactly what they are doing. I suspect it is a sine-cosine type situation like a full wave rectifier where you input a frequency and the output is the cosine frequency which is double but offset to one polarity. If it is not filtered it delivers a quite strong double frequency. That 14db loss is atrocious!
I have always wondered……. On parts such as this why doesn’t the manufacturer inner connect those common pins (such as the inputs on the device in the vid) to reduce the connections, PCB drill points, etc. for the end user?
*IT MUST BE ..THIS "THING" CAN DO MORE .. THEN "THIS WE SEE"*
Still need a bpf filter.
And why would you use this?
nice video. like the animated logo at the end of the clip