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Found specs on TA 7358AP; rated from -25 to +75*C . Obviously it is
not the problem. The PVC1 and PVC2 on the other hand are most likely to cause the terrible drift,especially now, in the hot summer days. Their internal structure contains polystyrene dielectric,as the tmperature rises plastics expand as far as I know. This will inrease the capacitance very minutely, but apparently enough to be seen on the digital display . One way to tackle this is to add a component with opposite thermal rating- capacitor or inductor in the oscillator/mixer circuit. |
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