Multiband VFO version 1.0

Basic architecture of a multiband VFO

Specifications

Po = +7dBm
No. of crystals = 3 (11/18/25/Mhz)
VFO Frequency = 3.5 - 4.0Mhz
Mixer Type = SA602 Gilbert cell
Band Pass filters = 7.0/14.0/21Mhz
BPF Bandwidth = 1Mhz

Using Ladpac to design the preliminary component values for the BPF