Harris Gates Two 994 9203 002 - SECTION H PDM FILTER (A10 and A11)

SECTION H
PDM FILTER (A10 and A11)
H.1. Principles of Operation
The purpose of the PDM filter is to filter
the 60 kHz switching waveform coming
fromthePDM amplifiers and passtheaudio
and dc components to modulate the PA
modules. Each PDM filterboard consists of
4 identical low pass filters, each filter has
two L-C sections. Part of the second capaci-
tor does not exist on the PDM filter but is
located on the PA module where the audio
and dc signal is injected into the power
amplifier.
Coupling capacitors C15, C25, C35 and
C45 couple the PDMfilterstogether to can-
cel the 60 kHz component, but yet remain a
high impedance to the audio component.
Resistors R13, R23, R33 and R43 are sam-
pling resistors that are used for metering the
PA voltage at each of the four filter outputs.
The outputs of the PDM filters are tied
directly to the power amplifier modulation
input jacks.
PWA, PDM FILTER ESD SAFE - 992 5874 009 (GATES TWO/FIVE)
HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS
335 0037 000 . . WASHER NYL 1.9375 ID . . . . . . . . 16.0 EA
357 0080 000 . . NUT, 5/16-18 . . . . . . . . . . . . . . . . . . 16.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
414 0268 000 . . CORE FERRITE POT SET . . . . . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
508 0536 000 . . CAP .033UF 400VDC 5% . . . . . . . . 4.0 EA C017 C027 C037 C047
508 0538 000 . . CAP .15 UF 400WVDC 5% . . . . . . . 16.0 EA C011 C012 C013 C014 C021 C022 C023 C024 C031 C032
C033 C034 C041 C042 C043 C044
508 0539 000 . . CAP 2 UF 400VDC 10% . . . . . . . . . 4.0 EA C015 C025 C035 C045
508 0550 000 . . CAP .1UF 600V 5% . . . . . . . . . . . . . 4.0 EA C016 C026 C036 C046
548 2400 518 . . RES 150K OHM 1/2W 1% . . . . . . . . 4.0 EA R013 R023 R033 R043
610 0840 000 . . HDR, STR, 4 PIN, RD . . . . . . . . . . . 1.0 EA J001
612 0301 000 . . JACK BANANA BRASS . . . . . . . . . 12.0 EA J011 J012 J013 J021 J022 J023 J031 J032 J033 J041 J042
J043
817 0914 267 . . STANDOFF .75X1 INSULATED . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
817 0914 268 . . STUD, 5/16-18 PHENONIC . . . . . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
8170914281.. WASHER,COILMTG ........... 8.0EA
829 8305 745 . . SUPPORT, COIL MTG. . . . . . . . . . . 4.0 EA
8395695419.. SCHEM,PDMFILTER .......... 0.0EA
843 5400 264 . . COMPONENT LOCATOR, PDM FILTER 0.0 EA
929 8305 662 . . COIL ASSY, 29 TURNS . . . . . . . . . 4.0 EA #L012 #L022 #L032 #L042
929 8305 663 . . COIL ASSY, 30 TURNS . . . . . . . . . 4.0 EA #L011 #L021 #L031 #L041
9433655209.. PWB,PDMFILTER ............. 1.0EA
9992343009.. HARDWARELIST .............. 1.0EA
PWA, PDM FILTER ESD SAFE - 992 5874 011 (GATES ONE)
HARRIS P/N DESCRIPTION QTY/UM REF. SYMBOLS/EXPLANATIONS
335 0037 000 . . WASHER NYL 1.9375 ID . . . . . . . . 16.0 EA
357 0080 000 . . NUT, 5/16-18 . . . . . . . . . . . . . . . . . . 16.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
414 0268 000 . . CORE FERRITE POT SET . . . . . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
508 0538 000 . . CAP .15 UF 400WVDC 5% . . . . . . . 8.0 EA C011 C012 C021 C022 C031 C032 C041 C042
508 0539 000 . . CAP 2 UF 400VDC 10% . . . . . . . . . 4.0 EA C015 C025 C035 C045
548 2400 518 . . RES 150K OHM 1/2W 1% . . . . . . . . 4.0 EA R013 R023 R033 R043
610 0840 000 . . HDR, STR, 4 PIN, RD . . . . . . . . . . . 1.0 EA J001
612 0301 000 . . JACK BANANA BRASS . . . . . . . . . 8.0 EA J011 J012 J021 J022 J031 J032 J041 J042
817 0914 267 . . STANDOFF .75X1 INSULATED . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
817 0914 268 . . STUD, 5/16-18 PHENONIC . . . . . . . 8.0 EA #L011 #L012 #L021 #L022 #L031 #L032 #L041 #L042
8170914281.. WASHER,COILMTG ........... 8.0EA
829 8305 745 . . SUPPORT, COIL MTG. . . . . . . . . . . 4.0 EA
839 5695 373 . . SCHEM, 1KW PDM FILTER . . . . . . 0.0 EA
8397920047.. SCHEM,PDMFILTER .......... 0.0EA
929 8305 673 . . COIL ASSY, 42 TURNS . . . . . . . . . 4.0 EA #L012 #L022 #L032 #L042
929 8305 674 . . COIL ASSY, 44 TURNS . . . . . . . . . 4.0 EA #L011 #L021 #L031 #L041
9433655209.. PWB,PDMFILTER ............. 1.0EA
9992600001.. HARDWARELIST .............. 1.0EA
Rev. AA: 8/18/1999 888-2314-001 H-1
WARNING: Disconnect primary power prior to servicing.