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Addendum
Local Oscillators
Introduction
Each synthesizer is locked to the reference oscillator. This consists of a 7.304 MHz
crystal (Z3) held at a constant temperature by an oven, which is one of the
following:
• a PTC thermistor (E1) at 60
• a high stability oven where the R3 NTC (Negative Temperature Coefficient)
resistor measures the temperature of the crystal and causes the op-amp
comparator IC1 to vary the current in the heating element V2 to maintain the
temperature of 65
The temperature of the high stability oven is set by R4. V1, R12 and R13 limit the
maximum current through V2 to approximately 400 mA.
Page 2, 12-50093 Issue 1
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HF SSB Transceiver X2 Technical Service Manual
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