开云体育

I had an old HP 856/8556 BWO-based spectrum analyzer at my first job, in 1975.? It, like all of the old non-preselected analyzers, had plentiful images and mixing products.??

?

It had a Signal Identifier button which shifted the LO a certain amount; only real signals would move down and 2 scale graduations to the (?)right, others would move left or different amounts.? Built character using it to design oscillators.

73, Don N2VGU