3rd Overtone

[ Up ] [ 3rd Overtone Oscillator Circuit ] [ 5th overtone ] [ 5th-7th-9th -- 200 MHz ]

R1 10K
R2 4.7K
R3 470 Ohm
R4 560 Ohm
TR1 BF180 or similar
C1 C2, C3, C4, See Below
C5 0.001mF
L1 wound is on a 7.62 diameter former with Neosid F29 core

F MHz C1 C2 C3 C4 pF L1 15 - 20 100 pF 100 pF 68 pF 33 pF 12 Turns 30SWG Close Wound 20 - 26 100 pF 100 pF 68 pF 33 pF 8 Turns 30SWG Close Wound 25 - 31 100 pF 68 pF 47 pF 33 pF 8 Turns 30SWG Close Wound 30 - 43 100 pF 68 pF 47 pF 33 pF 6 Turns 30SWG Close Wound 42 - 55 100 pF 68 pF 47 pF 33 pF 5 Turns 30SWG 6 mm long 48 - 65 68 pF 33 pF 15 pF 15 pF 5 Turns 30SWG 6 mm long

[ Up ] [ 3rd Overtone Oscillator Circuit ] [ 5th overtone ] [ 5th-7th-9th -- 200 MHz ]