70% roll off raised cosine filter t designed to be mounted
on the AM18/524 Stabilising teletext pulse amplifier which
forms part of the Teletext regenerator. DD 1977. DDMl
6MHz Lowpass, Phase Corrected, Filter designed for band
limiting in new coders. Mounted on printed circuit card
80mm x 48mm x 1.5mm. DD 1977.
Dual Lowpass Filter. This is a printed circuit board
carrying two lowpass filters identical to the FL4/ 579.
The cut off frequency is 6MHz and the impedance is 75Q.
PCB 80mm x 100mm. DD 1977. DDMl 8.594(78).
lOOns, Sine Squared Shaping Filter. Shapes waveform
to lOOns risetime, i.e. IT. l50Q impedance
compatible with NEl/527. Power requirements None.
3lmm x 49mm. Parent equipment GE6/540. DD 1978 .
5.5MHz Low Pass Filter for use in the
unweighted video noise associated with
conditions. 100mm x 50mm in Eddystone box.
5.0MHz Low Pass Filter for use in the measurement of
unweighted video noise associated with coded signal
conditions. 100mm x 50mm in Eddystone box. DD 1978.
Chroma Comb Filter. The card output is demodulated (B-Y)
and (R-Y) which has been low pass filtered. The output is
requirements +12V, -12V 50mA. 4U unsupported card. Sub-
units GE4/567, UN14/518, FL5/506 and CD3/537. DD 1978.
l2MHz Lowpass Filter. Removes unwanted high frequency
components from output waveforms. Passes IT puIs e.
Return loss 29dB. 63mm x 32mm printed circuit board.
Parent equipment GE4M/561. DD 1978. DDMl 9.253(79).
NTSC Chroma Comb Filter. The card output is (1) and (Q)
demodulated and low pass filtered. Card is suitable for
use direct to A-D converter. Power requirements +12V, -12V
50mA. 4U unsupported card. Parent equipment PA6M/544. DD
l44nS Sine Squared Shaping Filter. Chapes waveform edges
to l44nS risetime, 1. e. single Teletext pulse. l50Q
FL4/581. Printed circuit board 3lmm x 49mm. DD 1979.
Low-pass Filter. 5.5MHz Low-pass filter used in the
AM18/527 AGC amplifier. l12mm x 32mm printed circuit
board. Parent equipment AM18/527 and ME3M/502. DD 1980.
2.7MHz Lowpass Filter. This is a 75Q impedance, phase
corrected, lowpass filter with 3dBs of attenuation at
2.7MHz. PCB 150mm x 80mm. DD 1981.
2.7 MHz Low Pass Filter. This is a 75 Q impendance, phase