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

FT240-75 Fair-Rite 5975003801 RG-174 CO-174BNCX200-005 Amphenol Commercial Products 26 Turns Common Mode Rejection Ratio (CMRR)

Ground Rod 10"