UN23
UN23/580
UN23/584
UN23/590
UN23M/591
UN23/663
UN24/501
UN24/502
UN24/503
UN24/504
- 418 -
Logic Updating Unit, part of EPIM/S28.
board. DD 1972. OBSOLESCENT.
Printed circuit
Relay Interface Logic Unit, accepting 8 DTL/TTL logic
input signals and driving reed relays. Printed circuit
borad, 90mm x 90mm with 24 way edge connector. DD 1972.
OBSOLESCENT.
Channel Unit, used in EPS/513 to derive logic signals from
the control panel for the channel card. Burndy printed
circuit board, 222mm, with 53 way BICC connector.
SCPD 1972. OBSOLESCENT.
Area Mixer Logic Unit, used in EP5/513 to provide logic
signals for the area mixer. Chassis, 483mm x 222mm.
SCPD 1972. OBSOLESCENT.
Logic Unit. Provides all the timing and gating pulses for
the Field Interval Inserter AM1L/609. Power requirements
+12V, -12V, +5V. CH1/64A. Parent equipment AM1L/609.
DD 1978. CANCELLED.
UN24 DIRECTIONAL COUPLER UNITS
Directional Coupler Unit, 20dB, inserted in the output
lead of EP7/513 to feed back a percentage of the output
for AGC and monitoring purposes. A1uminium/Rexo1ite
sandwich construction. DD 1971. DDMI 5.216(71), 5.232.
OBSOLESCENT.
3dB Directional Coupler Unit, used in AM14/544 to combine
the output signals from two AM14/545. Working frequency
range 686MHz-702MHz. Special coupler cable on printed
wiring board in CH1/45. DD 1972. OBSOLESCENT.
3dB Directional Coupler Unit, used in AM14/546
the output signals from two AM14/547. Working
range 766MHz-782MHz. Special coupler cable
wiring board in CH1/45. DD 1972. OBSOLESCENT.
to combine
frequency
on printed
3dB Directional Coupler Unit, used in AM14/548 to combine
the output signals from two AMI4/549. Working frequency
range 834MHz-849MHz. Special coupler cable on printed
wiring board in CH1/45. DD 1972. OBSOLESCENT.
==========================================================================
UN24 Sub Group not available for new designs. DD 1977.

118