Multisim Simulation a FM transmitter drom E-desing

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Flying_carlos

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I'm a newbie with multisim and was trying to see a FM circuit posted by E-design. I got a curios behavior . The circuit alone doesn't oscillate until I add a Spectrum analyzer instrument and a probe (probe1). Taking out the SA the circuit oscillate around KHZ .
I really don't understand what happen.


Here is the circuit
 

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  • Fm Transmitter E-Design.jpg
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Your circuit needs a load at the output. Place a 1k resistor to the ground from the SA and Probe joint (right side of C6).
 

vfone said:
Your circuit needs a load at the output. Place a 1k resistor to the ground from the SA and Probe joint (right side of C6).
Click to expand...

I did it, but isn't still working. Probe2 is ~50KHz and Probe1 ~550HZ
 

Make sure your Initial time step (TSTEP) under Simulate-Interactive Simulation Settings is small enough. For this example must be ≤ 1nS otherwise oscillations won't start.
 
I need help........... I dont understand how this circuit works! What is the signal??
 

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