Meachom
Bridge Oscillator with circuit
The
Meacham bridge oscillator, illustrated in figure
1460, provides the greatest
frequency stability of any vacuum-tube oscillator yet devised, but the region
of maximum frequency stability is limited to the lower frequencies because of
the increased effect of the 8cray circuit capacitances when the frequency
becomes greater than a few hundred kilocycles per second. The oscillator is of
the crystal-stabilized type employing tuned circuits. At frequencies above 1000
kv the effect of the stray capacitance is sufficient to reduce the stability to
a point where little is to be gained by the use of the Meacham
