Harbach Electronics SB220RELAY User Manual

SB-2 20 REPLAC EMENT RELAY CONTACT/WI RING DIAGRAM

(VIEWED FROM BACK CONTACTS OF RELAYS)

**NOTE** SOME OLDER SB-220 RELAYS MAY BE W IRED DIFFERENTLY

(PINS 1,4,7 & 2,5,9 FOR RF SWITCHING & PINS 3,6,10 FOR BIAS SWITCHING

CONTACT CROSS-MATCHING (NEW = OLD)

1 = 12 = 23 = 34 = 4

5 = 56 = 67 = 78 = 99 = 10

A = COIL 11B = COIL 12

NEW RELAY PINOUT

PIN 1 LARGE BARE WIRE TO PIN 3
PIN 2 ONE END OF 100KΩ RESISTOR & SMALL RED WIRE FROM 120VDC

SUPPLY & SMALL RED JUMPER WIRE TO PIN B
PIN 3 LARGE BARE WIRE TO PIN 1
PIN 4 SMALL COAX CENTER CONDUCTOR TO TUNED INPUT
PIN 5 LARGE BLACK WIRE TO RECTIFIER/METERING BOARD
PIN 6 LARGE BARE WIRE TO TANK CIRCUIT
PIN 7 SMALL COAX CENTER CONDUCTOR TO RF INPUT JACK
PIN 8 OTHER END OF 100KΩ RESISTOR AND GREEN/YELLOW WIRE TO

CENTER TAP OF FILAMENT TRANSFORMER
PIN 9 LARGE COAX CENTER CONDUCTOR TO RF OUT JACK
PIN A SMALL BLUE WIRE TO ANTENNA RELAY JACK OR TO SK-220 UNIT
PIN B RED WIRE JUMPER TO PIN 2