Ah, so it starts at zero mA, although we are not interested (and likely not specced)below 3.8 GHz. 3.8 GHz output would then correspond to 3.8 * 23 mA on the main coil. Should the FM input be zero? ?I haven¡¯t yet checked that. I wonder how far the FM input can move it if for example one if those transistors are bad.?
This would be an easy bench test of the YTO, or even easier in-instrument.?
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On Mar 21, 2019, at 4:17 PM, pianovt via Groups.Io <
pianovt@...> wrote:
It's a straight line, so pick any frequency you want. There is a non-linearity starting above 5.5 GHz or so. But, you are having problems at the low end, below 1 GHz rf out. That means the YTO is tuned to ~4.8 GHz when the rf output is 1 GHz.. Let's say you pick 4 GHz as a test point. The current should be 4 x 23 = 92 mA. If the actual coil sensitivity is at the upper limit (24 mA/GHz), then 96 mA.
Vladan
