开云体育

???? Someone suggested getting the handbook for the Boonton 260
Q-Meter. Since Boonton did this already perhaps you can get some
inspiration from it. Of course its tubes but nonetheless one can
use the same principles for SS. Also look at the type 190, the
VHF version of the Q-Meter. Essentially both use a constant
current source to drive the test circuit. Also, download the set
of Boonton newsletters, which are available at the -hp- archive
where the handbook is. Boonton more or less invented the Q meter
and wrote a lot about its theory of operation.

??? A note: The meter scale is matched to the amplifier. Usually,
the amplifier has an extremely long life but both go together.
For this reason the solid state replacement for the tube will
probably not match the meter scale.

??? If you obtain a Q-Meter also find some standard coils to
check its calibration. They are quite accurate. Note that Boonton
supplied both "standard" and "working" coils. The "working" coils
are very convenient to have but one can make them. The Boonton
coils are very high Q. The "standard" coils are calibrated for Q,
and resonant capacitance.