YO4HFU
Automatic Noise Figure Meter

26.04.2013

 


Not recommended design, only for reference.

Service Manual
Ailtech 7310/7320 System Noise Monitors
Ailtech 7310 Main Board - tnx for help: LA3PNA & M0XPA

Schematic Diagram:
Preamplifier & π Attenuator
Frequency Converter
Schematic Diagram after my modification: >BMP< (better resolution) and >PDF<
ENR Switch
+28V Power Supply

PCB
Over Range Indicator
Video Board
RF Board
Converter (Mixer) Board
Preamplifier 29MHz
Oscillator 285Hz
+28V, +/-12V Power Supply

Photos
Inside Noise Figure Meter
RF Section
Panel Switch
Early Version PCB


 

 

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