harbach-electronics sb220relay User Manual
SB-220 REPLACEMENT RELAY CONTACT/WIRING DIAGRAM
(VIEWED FROM BACK CONTACTS OF RELAYS)
**NOTE** SOME OLDER SB-220 RELAYS MAY BE WIRED 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 100K
Ω
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 100K
Ω
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