The oscillator circuit is included with the VFO mixing type for the transceiver with one transformation.
The overlapping range of frequencies - 4812...5312 kHz. Initial run frequency for 2 minutes after power - GZ. In the future, the frequency stability 15...20 Hz.
Directly generator transistors VT2 VT3 scheme similar to the lambda diode. This scheme has a high temperature stability and small nonlinear distortion. The current consumed by the generator is equal to 220 ... 230 μa. On elements VT1, DA1 is made a voltage regulator to power the generator. VT4 - source follower for decoupling the generator from the effects of subsequent stages. Setting of the generator is reduced to the range of overlapping frequencies with C5 and C6 and setting the operating point of the generator. To do this with R3 set the voltage at point a equal to 2.65...2.75 V.
Author: I. ptashnyk (RB5UM), Ukraine, Kyiv region, Bucha; Publication: N. Bolshakov, rf.atnn.ru