| Analizator antenowy MFJ259B, uszkodzony? |
| Z tego co pamiętam, za nagłe awarie tego przyrządu zwykle bywają odpowiedzialne diody detektora. Należałoby to sprawdzić. Most Likely Failures Other than manufacturing errors, the detector diodes clearly stand out as the most common problem. They are the most easily damaged devices in the analyzer. If you have a sudden problem, it is most likely a defective detector diode. Diode damage almost always comes from accidentally applying voltage on the antenna port. Why are the diodes so sensitive? In order for the detectors to be accurate within a fraction of a percent (one bit), detector diodes must have very low capacitance and very low threshold voltage. This means the diodes, through necessity, must be low-power zero-bias Schottky microwave detector diodes. The same characteristics that make them accurate and linear also cause the diodes to be especially sensitive to damage from small voltage spikes. ALWAYS discharge large antennas before connecting them to the analyzer! Never apply external voltages greater than 3 volts to the antenna port! |