[Elecraft] KS PLL Reference Oscillator

k4zm k4zm at comcast.net
Wed Nov 24 15:35:02 EST 2004


John:

Have you used a seperate freq counter measure the freq or a general coverage 
receiver to listen to the freq at both hi and lo setting to make sure you 
dont see a steady signal?...Also can you adjust the votage at R30 to the 
value called for in the manual?.... My freq counter transistors amplified 
but not enough to drive the input of the counter at the higher freq and the 
result was what appeared to be a frequency jumping all over the place.  I 
discoveered the PLL was in lock and the freq steady and in range by using a 
general coverage receiver to listen to the PLL output.

About the only thing that could cause that is one or two of the Varicap 
Diodes of the wrong type installed in the PLL circuit or a wrong capacitor.

73
Jim Younce K4ZM
K2 SN 18 




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