I have 3 "Emitter-Coupled" Oscillator (Source: http://www.falstad.com/circuit/e-eclosc.html), the difference is that I don't use a resistor on the tank circuit and I do vary the Inductor inductance. They're close on the PCB and they got some disturbs, if only one is running everythings is great, but if the others starts to oscillate, then everything got messed up. What can I do to fix this?