Hz?

 

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G3RJV Data Card

Practical VFO values.

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Values for the HF Bands based on Toko Inductors.

 

The circuit shows a typical Colpitts based VFO using an NE602 (or NE612) mixer.

The values below use Toko standard inductors to achieve a VFO for a range of amateur band.

 

 

 

 

BAND
L

Toko Number

VC
pF

C4
pF

C3
pF

C2
pF

C1
pF

1.8MHz

KANK3333

75

120

560

1000

1000

3.5MHz

KANK3334

75

100

560

1000

1000

7.0MHz

KXNK4173AO

25

47

270

560

560

10.1MHz

KANK3335

25

68

220

680

680

14.0MHz

KANK3335

25

68

68

220

220

These are "ball-park" figures based on the Sudden Receiver.
The compromise depends upon the available Toko inductor. These are slug tuned variable and it should be possible to move the frequency to the desired place.

Adjust of the ratio or VC and C4 may be required to obtain the appropriate amount of band coverage.
Although shown for an NE602/612 oscillator, these values should work with other Colpitts VFO circuits.