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FREQ-MITE Audio “Frequency Dial” option (See separate schematic). O. O. RF PRE-AMP. MIXER. AUDIO GAIN. LOW PASS FILTER. R19 1K. +V. Add Rx/Cx mods for improved RF sensitivity. Rx 47. 330pF NPO for 80m. +V. R31 2.2K. R16 10K. C34 10uF. C36 0.1. T3 Pri: 2T #28

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+6V

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  1. FREQ-MITE Audio “Frequency Dial” option (See separate schematic) O O RF PRE-AMP MIXER AUDIO GAIN LOW PASS FILTER R19 1K +V Add Rx/Cx mods for improved RF sensitivity Rx 47 330pF NPO for 80m +V R31 2.2K R16 10K C34 10uF C36 0.1 T3 Pri: 2T #28 Sec 36T #28 tap 2T from gnd C20 100 U4a LM358 C21 2.2uF T2 IF xformer R17 100K R18 100K Cx .01 U3 ADE-1 U4b LM358 R14 220K R20 100K R21 100K 3 8 l + 5 1 + 3 C22 680 NPO 2 ANT 2 7 C35 100pF C15 0.1 - C24 680 NPO R15 10K 4 1, 4,5 6 C19 2.2uF - 6 RFC2 (to tune for other band use) R12 47 R11 220 Q3 2N5485 Q4 2N3565 C18 0.1 C23 .01 Mylar C25 .01 Mylar A A Jumper A (wire across board) +V (+9 to 12V) VR1 LM78L06 LOCAL OSCILLATOR LO BUFFER AUDIO AMP +V MUTING +6V l O I R26 10 G R30 100 C10 0.1 C6 0.1 C37 47uF R23 1M R27 10K C30 10uF C29 47uF C28 0.1 l C12 0.1 6 R13 4.7K R29 27K C32 .01 1 T1 10T #26 bifilar wound on FT37-43 Jumper C (jumper for 40m use) R22 1M C7 100 3 C31 100uF Q1 2N2222A Q5 2N5485 8 8 C8 0.1 R25 4.7K C C 5 U5 LM386 1 3 O O 1 4 l 2 O O C2 22 C3 0.1 R24 10K C27 0.1 D2 1N4148 R7 (see text) L1 4.7uH (IF xformer) 2 O Y1 3.58 MHz Resonator 2 U1 SA612 R28 10 4 Q2 2N2222A R2 10K R10 100K AUDIO LEVEL R9 50K R3 1K 6 3 KEY LINE TUNE C33 0.1 C13 C4 220 C9 0.1 R4 100 C16 0.1 7 l R8 (see text) C5 220 PHONES D1 MVAM108 New Jersey QRP Club “SOP” RECEIVER 0.1uF = 3.52 – 3.55 MHz (7.04 – 7.11 MHz) – supplied in kit 100pF = 3.53 – 3.56 MHz (7.06 – 7.12+ MHz) Designed by J. Everhart, N2CX 4/10/2002 – n2apb rev C

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