DBM LF Converter Design

Mini-Circuits ZAD-6+ Double Balanced Mixer



LF Whip Amplifiers

LF WhipAmp V1 J310 and 2N2219A
LF WhipAmp V2 J310 and OPA820


LF Loop with Amplifier

Centered Loaded Loop


500kHz 9P Butterworth LPF

Capacitors = NPO Ceramic 5% 50V
Nominal 17uH = FT37-61 19T (measured)
Nominal 30uH = FT37-61 24T and 25T (measured)



530kHz 7P Elliptic LPF

Dallas, TX KRLD 1080kHz Optimized

Capacitors = NPO Ceramic 5% 50V
Nominal 11uH = FT37-67 24T (tuned)
Nominal 18uH = FT37-61 19T (measured)



Common Mode Choke, 4mH



Ground Rod 10"