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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.
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