This relates to my interest in Time and Frequency.
This appears to be a harmonic or comb generator, similar in concept to the HP 8406 Frequency Comb Generator. The main difference is the HP 8406 uses 1, 10 or 100 MHz comb separation with a maximum frequency of about 4 GHz. This comb generator has selectable comb separation frequencies (input frequencies) of 50 or 100 MHz, but with outputs between 50 MHz and 11 GHz. Another difference is that this unit is based on vacuum tubes.
The 50 MHz crystal is adjacent to V2 (12AT7WA). This dual triode is rated as an oscillator up to 300 Mhz. But the circuit is strange in that the crystal is connected between the two cathodes.
LabelVHF-UHF Frequency Calibrator
Range: 50 Mc to 11,000 Mc
Supply: 115 V. 1 (phase) 50 - 440 cycles
Model No. 121 Serial No. 55
Control Electronics, Co., Inc.
Huntington Station, Long Island, N.Y.
AC Input Connector
See Fig 1 below.
Three male pins.
O.D.: 0.618 (male threads)
Transformer 386 V c.t. (6.3 VAC fil)
50 MHz crystal (pins3 & 9)
5654 (6AK5W) pentode Freq Multiplier
5 Watt Amp
Power Amp up to 160 MHz
Osc Out, V3 Grid 1
V4 Grid 1
V5 Grid 1
Fig 1 The grill is for ventilation.
Fig 2 The crystal is 50.000 Mc.
Fig 3 Top: Tubes & Test Points
Fig 4 Bottom Cover Removed
DTIC AD0149085: A Study of Crystal Oscillator Circuits, 1957 - The Cathode Coupled Crystal Oscillator aka Buttler Oscillator is the circuit for V3.
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