![]() The design enables replacement of individual RF, IF and Synth modules without needing to re-calibrate the analyzer. I have not investigated such so cannot provide further comment. The firmware sits in the 16MB Sandisk Compact Flash card, Calibration data is stored in EEPROM on the modules. I do not think the VCO is the cause of the error in the latest 3132 question. ![]() The movable dielectric 'pad' does not have any metal content and is plain dielectric material. I cannot say I like the agricultural looking design of the VCO, but it does seem to work OK. eventually the drift exceeds the compensation range available to the VCO controller and the unit fails self test. The centre point setting drifts over the years possibly due to component aging or dielectric characteristics changes. The Varicap diodes pull it + and - from the set point. It uses a variable dielectric 'pad' to centre the VCO mid range point. ![]() The 3132 PCB image is of the (IIRC) approx 6GHz 2nd Mixer VCO.
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