Hartley oscillator using transistor problem

[shirko20]

Hi masters.i have a hartley circuit based on transistor ,my problem is when i change the value of L1 and L2 to a " uH " value for instance L1=L2=1uH the output wave is nothing while it works for L1 and L2 in "mH" values for instance it works when L1=L2=1mH ,WHY? how i can make it work for L1 and L2 in uH values?I changed C1 value according to L1 & L2 value for giving 11khz frequency but no succeed.
here is my working circuit:

 

[FvM]

Try to keep the characteristic resonant circuit impedance √L/C
Instead of reducing L only, reduce L and C by the same factor.

 

[shirko20]

hi,according to dear FvM above replay i changed L1=L2=1uH and changed C1 to 1nF and it gave me sawtooth like sinewave.but it was working,now how i can make it look likes sine wave?

 

[shirko20]

thank you FvM your thread was helpful,I set L1=L2=1uH and set C1=0.1uF and it works,But my another problem is that why counter timer component that i used in #POST1 circuit cant measure frequency of circuit and just show 0?How to measure frequency of this circuit in proteus?

 

[FvM]

I believe that's a problem with the different handling of analog and digital signals in the simulator. May be a schmitt-trigger gate does the required conversion. I'm no Proteus expert and don't wont to become one.

 

[shirko20]

thank you FvM for your replays, what simulator must be used to measure this analog frequency of this circuit?

 

[ravindragudi]

The counter timer should work, but looks to be some problem there. Just try using oscilloscope measurements..

 

[shirko20]

how to measure frequency using oscilloscope i dont know, iis ther a formulla?