5th Overtone

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

XL1 Ri L1
50-70 MHz 2.7 K 7 Turns 6mm long
60-85 MHz 2.7 K 5 Turns 5mm long
80-105 MHz 1.2 K 3 Turns 6mm long.

R2 470 ohm Cl l2pF
R3 330 ohm C2 18pF
R4 470 ohm C3 33pF
C4 1000 pF

VT1 8F180, SE1O1O or similar.

L1 Wound with 20 B & S enameiled wire on 7.62 mm diameter former with Neosid F29 Core

Under no circumstances should a tuned circuit at the crystal overtone frequency be included in the collector circuit of VT1, as this configuration will result in oscillation not controlled by the crystal.

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