I had an idea to combine many different test jigs into a 80mm x100mm 2 layer PCB.
So far I have the following test jigs on the board:
1. Inductor Q/Self resonant frequency test jig. This connects to your spectrum analyzer with tracking generator. It allows you to measure the center frequency and 3dB B/W in order to calculate inductor Q. It can alao give you an idea of the inductors self-resonant frequency.
2. Mixer diode forward voltage tester. Used your 13.8V power supply and a 2.7K ohm resistor to force 5mA across a diode to grade them for forward voltages.
3. Crystal oscillator for measuring the frequency of crystals so that they can be selected for crystal filters. The switch switches? in and out a 39pF capacitor to measure frequency shift and allow calculation of Cm and Lm.
A picture of the current lay out is attached.
My question is, are there any other test jigs which might be useful in homebrew radio projects which could fit in the empty area at the bottom of the board?
Steve
WA6ZFT
hwstar
