Mark-94 Main part block diagram 2ND OSC TX Mic 6MHz Filter Mic AMP TA2011S Balanced Modulator NJM2594 TX IF AMP 2SK241 TX IF OUT RX IF IN Side Tone CW Side Tone 74HC02 SP AF Power LM386 AF AMP 2SC1815 Balanced Modulator NJM2594 RF IF AMP 3SK114 RF IF AMP 3SK114 RF IF AMP 3SK114 AM Out AGC AMP LM324 AGC DET 1N60 X2 AGC AMP 2SC1815 AGC

Mark-94 RF block diagram RF AMP MGF4910C RF AMP 3SK183 MIXER 2SK241 X2 From RX ANT RF AMP MGF4910C RF AMP 3SK183 MIXER 2SK241 X2 SSB/CW IF AMP 2SK241 To Main RX IF In AM 2nd MIXER/OSC IF AMP AM DET LA1600 455KHz AM Mode 5545KHz To Main AM Out From VFO 44.000-44.700MHz TX IF IN MIXER 2SK241 X2 Buffer 3SK114 Pre-Driver 2SC2053 Driver 2SC2078 Final 2SC1945 TX ANT 2nd OSC Carrier Level control 2SC1818/2SA1015 From MPU

Mark-94 VFO part Mark-94 2nd OSC part PLL TC9256AP Active LPF From MPU PLL TC9256AP Active LPF 2SK30/2SC1815 VCO 2SC1907E Buffer 2SC1907E 1SV101 X2 BPF VFO Out LPF DDS AD9834 Buffer 2SK241 Mark-94 2nd OSC part LPF From MPU DDS AD9834 Buffer 2SK241 RX 2nd OSC Buffer 2SK241 TX 2nd OSC Keying 2SC1815

50.200 DISP CPU CONT CPU 16F877A 16F877A Mark-94 MPU part LCD display KeyBoard Crystal Module 16MHz 50.200 SDO SDI CONT　CPU 16F877A SDI SDO DISP　CPU 16F877A SCK SCK Encoder Pulse VFO PLL/DDS CW Key (Dot&Line) PTT Key Speed SideTone /Mute/BZ 2ND OSC Mode Control