In blocks the formation of single-sideband signal load balanced ring modulator often serves as Electromechanical filter (EMF). In this case, when changing the sideband due to the change of the reference oscillator frequency of the suppressed carrier frequency, usually deteriorates.
The option to include EMF in the balanced modulator, the proposed UB5CE free from this drawback.
Coil L1 should have an inductance of about 1.8 mg. It can be wound on an annular magnetic core of ferrite with a magnetic permeability of 1000 (60 turns of wire PELSHO 0.1), removal of do from the middle.
Author: UB5CE; Publication: N. Bolshakov, rf.atnn.ru