On 4/1/21 11:16 AM, Richard (Rick) Karlquist wrote:
On 4/1/2021 10:32 AM, Lux, Jim wrote:
And for what it's worth DROs have their microphonic problems too. We
had a breadboard deep space transponder and you could demodulate your
voice (poorly) using the spectrum analyzer's FM demod feature. Very
cool. Unimpressive to the folks who wanted to push the technology.
We were
Back around 1970, as LM radio switched from AM to FM, the HP 608
signal generator was losing market share because it couldn't
do FM. Believe it or not, there was actually an Ap Note describing
how to obtain FM by bolting a 4" loud speaker to the 608 cabinet
and driving it with an audio signal generator. Those were the days ...
Rick N6RK
and people wonder why they have a speaker in the spectrum analyzer -
it's just for this sort of debugging.
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