Party Line 80 Basic Assembly Instructions

Power Entry

D13 - LED
D14 - SB140
R62 - 3.3 kΩ
J4 - 2.1 x 5.5 mm DC power jack

Power Entry Functional Test

Check for DC power on TP4, LED lights up.

AF Power Amplifier

D4, D4, D6 - 1N4148
R31, R33 - 100 kΩ
R29, R30 - 1 Ω
R28 - 10 Ω
R26 - 51 Ω
R23 - 470 Ω
R27 - 1 kΩ
R22, R24, R25 - 2.2 kΩ
R21 - 4.7 kΩ
R19 - 47 kΩ
R20 - 10 kΩ
C20 - 2.2 nF
C19, C21, C24, C25 - 10 μF
C17, C22, C23 - 100 μF
Q10, Q11 - 2N7000
Q9 - 2N4403
Q5, Q6, Q7, Q8 - 2N4401
J1 - 3.5 mm Jack

AF Power Amplifier Functional Test

Active AF Low-Pass Filter

R12, R16 - 100 Ω
R10, R11, R13, R14, R15, R17 - 4.7 kΩ
C16 - 100 nF
C5, C7, C11, C13 - 10 nF
C9, C15 - 10 μF
Q3, Q4 - 2N4401

W7ZOI AF Feedback Amplifier

R1, R7 - 51 Ω
R3 - 150 Ω
R5 - 22 Ω
R8 - 680 Ω
R9 - 220 Ω
R4 - 1 kΩ
R2, R6 - 1.8 kΩ
Q1, Q2 - 2N4401
C1 - 100 nF
C3, C4 - 100 μF
C2 - 220 μF
L1 - FT37-43 25 turns

Active AF Low-Pass Filter and W7ZOI AF Feedback Amplifier Functional Test

Listen for hiss, check AF gain pot function, listen for hum when a metal tool is used to probe TP10.

Double-Balanced Diode Ring Mixer

D1, D2, D3, D4 - 1N4148
T3, T4 - FT37-43 10 turns bifilar

3.5815 MHz Crystal Filter

T1, T2 - FT37-43 3 turns:21 turns
C6, C10, C14 - 25 pF
C8, C12 - 20 pF
X1, X2, X3, X4 - 3.582 MHz crystal

Local Oscillator

D8 - 1N4148
D10 - 1N5237B
R35 - 100 kΩ
R41, R42 - 10 kΩ
R46, R51 - 100 Ω
R52, R54 - 220 Ω
R47, R50 - 470 Ω
R53, R56 - 150 Ω
C33, C34 - 560 pF
C36, C37, C38, C39 - 100 nF
Q13 - 2N7000
Q15, Q16 - 2N4401
C29 - 45 pF trim cap (yellow)
X5 - 3.582 MHz crystal

Local Oscillator Functional Test

Check for LO signal at TP1 and TP2

TX Low-Pass Filter and T/R Switch

D11, D12 - 1N4148
C49, C53 - 270 pF
C51, C52 - 1 nF
C46 - 82 pF
L5 - FT37-61 20 turns
L7 - T37-2 26 turns
L6, L8 - T37-2 20 turns
J3 - BNC jack

Receiver Functional Test

Keying and Mute

D15 - 1N4148
R34 - 220 Ω
R36 - 2.2 kΩ
C28 - 100 nF
Q12 - 2N4403
J2 - 3.5 mm jack

Keying and Mute Functional Test

Connect a key to the key jack and listen for the audio hiss to be muted when the radio is keyed.

Sidetone Oscillator

R57 - 47 Ω
R59 - 330 Ω
R58, R60, R61 - 3.3 kΩ
R32 - 220 Ω
C26, C45, C47, C48, C50 - 100 nF
C44 - 1 μF
Q20 - 2N4401

Sidetone Oscillator Functional Test

Connect a key to the key jack and listen for a receiver muting and a sidetone when keying is activated.

TX Preamp

R43 - 47 Ω
R44 - 4.7 Ω
R40 - 100 Ω
R37 - 1.5 kΩ
R38 - 2.2 kΩ
R39 - 3 kΩ
C27, C30, C31, C32, C35 - 100 nF
Q14 - 2N4401
T5 - FT37-43 10 turns bifilar

TX Preamp Functional Test

TX Power Amplifier

D9 - 1N5237B
R45 - 10 kΩ
R48, R49 - 3.3 kΩ
C40 - 100 nF
C41 - 560 pF
C42 - 360 pF
C43 - 1.5 nF
L2, L3 - FT37-43 10 turns
L4 - T50-2 36 turns