Hi Geo,
I'm well and you? Unfortunately I am a long time away from home and from my laboratory and also from the research fields ... I hope you are luckier.
Oh yes, i am home with laborator at underground.
I have one month yet before begin the works at farm.
Yesterday i took a Xtal version to see (for another time) how it works and catch the phenomeno, or how phenomenon aplied at input circuit....
I connected the scope at collector of Tr2 (mixer) and gave signal with generator (via a small wire as antenna) at input. Without input signal i had a signal of 8Mhz at Tr2 but with input signal 120Mhz i had signal about 1Khz. Why???? where are the other frequences of mixer?? (120+ 8Mhz or 120-8Mhz or the same for harmonics)????
It works as to exist a LF filter at out of mixer. Any idea???
Oh yes, i am home with laborator at underground.
I have one month yet before begin the works at farm.
Yesterday i took a Xtal version to see (for another time) how it works and catch the phenomeno, or how phenomenon aplied at input circuit....
I connected the scope at collector of Tr2 (mixer) and gave signal with generator (via a small wire as antenna) at input. Without input signal i had a signal of 8Mhz at Tr2 but with input signal 120Mhz i had signal about 1Khz. Why???? where are the other frequences of mixer?? (120+ 8Mhz or 120-8Mhz or the same for harmonics)????
It works as to exist a LF filter at out of mixer. Any idea???
Regards
I have no idea, but the fact is that TR2 is not really a mixer that is used for frequency conversion, if I remember well in this case the signals must be very large to make TR2 work in a non-linear way, that is to say with distortion . In the case of my lrl signals of very small amplitude are mixed.
Regards
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