AM2
AM2M/504
AM2M/ 50 5
AM2M/506
AM2/507
AM2/508
14 -
Carrier
PA7/506
266dB,
CHl/12A.
Amplifier, 2lMHz, used as head amplifier in
to amplify signal from a quartz delay line. Gain:
approximately. Includes AM2/502 and PS2/22C.
DD 1966. OBSOLESCENT.
Carrier
PA7/506.
AM2/503.
Amplifier, 2lMHz, used to drive a delay line in
Gain: 40dB, approximately. Includes AM2/502,
CH1/l2A. Pegs 24, 40. DD 1966. OBSOLESCENT.
Sub-carrier Amplifier used to provide a sub-carrier feed
to GE4M/5l8. PN3/23 with sub-units including OSl/502 and
UN1/540. DD 1966. WITHDRAWN.
Input Carrier Amplifier, 30MHz, used in NE4/504. Gain:
26dB. PCB in copper box l20mm x 85mm x 50mm. DD 1967.
DD Spec 7.122. ACO. OBSOLESCENT.
Output Carrier Amplifier, 30MHz, used in NE4/504. Gain:
30dB. PCB in copper box l20mm x 85mm x 50mm. DD 1967.
DD Spec 7.122. ACO. OBSOLESCENT.
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AM2 Sub Group not available for new designs DD 1977.
AM3/l
AM3/2
AM3/3
AM3/3A
AM3/3B
AM3/4,A,B
AM3 DETECTOR AMPLIFIERS
Amplifier Detector, 20kc/s, for detecting 20kc/s
"protective tone" used for monitoring radio links feeding
semi-attended
or
unattended transmitters.
Plug-in
box
chassis
mounting
on
AMS/l.
Valves:
CV40l4,
CV4024.
Replaced by AM3/3A or AM3/3B in new installations handling
stereo signals. DD 1958. DD Spec 5.47. DDHB 5.159.
TI.T.lO. OBSOLESCENT.
Amplifier Detector consists of two tuned amplifiers for
detecting tone to switch three circuits. Part of
switching system between Dublin and Mohercrome. CHl/18D.
DD 1965. DD Spec 2.243. WITHDRAWN.
Monitoring Tone Detector
uned in Tone Automatic
CHl/26A, Pegs 17, 40.
OBSOLESCENT.
Amplifier for 19kHz-23kHz tones
Monitoring. Unbalanced input.
DD 1967.
DD Spec 5.132.
ACO.
As AM3/3, AM3/3A
balanced input.
OBSOLESCENT.
and AM3/3B
DD 1967.
respectively, but with
DD Spec 5.132.
ACO.
As
AM3/3
but
for
19kHz
tone
only.
DD 1967.
DD
Spec 5.132.
OBSOLESCENT.
 
 
 
As
AM3/3
but
for
23kHz
tone
only.
DD 1967.
DD
Spec 5.132.
OBSOLESCENT.
 
 
 

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