M464 — HP LP Filter

MFG MFG PART NUMBER ZI 22 23 25 Integrated circuit Nationa | LM3OIAN Signetics NES3IV 26 27 Nationa] LM3OIAN 4-6

WARO-BECK SYSTEMS LTD DESCRIPIION 4-109 AMPLIFERSERIES The 4-109 series of amplifiers are printed circuit board units which are utilized as 4M interna] component in certain WBS 450 and 460 series modules Each 4-109 amplifier mounts a $ plug - in unit on the modu le motherboard Thc 4-109 amplifier provides an actively balanced output with +28 0r +30 dBm capabiity and is employed a $ an output or booster amplifier with either an unba lanced or balanced input The following specifications apply to the 4-109 amplifiers UNIT INPUI GAIN MAX_ OUTPUT 4-109 4-109a 4-1098 4-109c 4-1090 4-109E 4-109F 4-109G Ba anced Unba lanced Ba lanced Ba lanced Unba lanced Ba ]anced Ba Tanced Ba Tanced 15 dB 7 dB 18 dB 39 29 3 29 33 dB 2.3 dB +30 dBm +30 dBm +30 dBm +30 dBun +28 dBm +30 dBm +30 dBm +30 dBmi Frequency Response: +0.2 dB from 20 Hz to 20 kHz Noise: -110 dBm EIN from 20 Hz to 20 kHz Harmonic Distortion: Less than 0 . 25% TId from 20 Hz to 20 kHz at maximum output (typica]y 0 . 02r ) Output Impedance : Load Impedance: Power Requirements: Less than 100 ohms 600 ohms 421 .5 volts dc, 18 ma quiescent current , 95 MA at +30 dBm output into. 6 00 ohms Toad Ambient Temperature: 0 to 60 degrees Cels ius 3.25" X 3.38" X 0,57" (83 II" X 86 MM X 15 mm ) Dimensions 4-109-1-1

WAAD-BECK SYSTEMS LTD

4-109 AMPLIFIER_SERIES The two amplifier seclions 0 f integrated circuit 21 function a $ the input buffer and voltage ga in devices 0 f the 4-109 units. The inputs of 2I may be interconnected to provide cross - coupled differcntia] configuration for thc balanced input used in the majority 0 [ 4-109 applications or they May be connected a5 conventiona] unbalanced input a$ in types 4-109a and 4-1090 : The ba Tanced input configuration yields severa] input charac - teristics s imilar to those 0 f an input transforier Output Tevel Will remain constant when the di fferentia| input is fed from either ba ]anced or ba Tanced sources The unba lanced mode 15 used following 'preamp]ifier or equa] ization circui try Two identica] output stages consisting 0 f transistors Q1 thru Q8 provide thc ba lanced output which appears 0n termina]s E4 and F 6 (+28 dBm 0r +30 dBm ) Thc va ]ue 0 f resistor R27 controls the amplifier gain acting a $ shunt to the feedback Toops around 71A and ZIB in conjunction with resistors RII R13 , R29 and R30 when the amp]ifier is operating in the baTanced mode:. In the unbalanced mode ZIB Iways operates at unity gain inverting the s igna] to drive the second ha / f o,f the balanced oulput and overa]1 amplifier ga in in defined by the feedback section 0f LIA by adjusling R4 , RII and R13 4-109-1-2

WAAD-BECK Systems LTD

4-109 AMPLIFIER_SERIES The two amp]ifier seclions of integrated circuit. Z1 function as the input buffer and Vo Itage ga in devices 0 f the 4-109 units The inputs of Zi may be interconnected to prov ide cross - coupled differentia configuration for the balanced input used in the majority o f .4-109 applications 0r they May be connected a5 conventiona unba anced input as types 4 = 1094 and 4-1090 .

The ba Tanced input configuration yields scvera] input charac- teristics s imilar to those 0 f an input transformer Output Teve Wil] rema in constant when the differential .input is fed Trom either ba ]anced ur ba lanced sources The unba lanced mode used following preamp]i fier or equa 1 zation circui try . Two identica] output tages consisting 0 f.

transistors Q1 thru Q8 Peoxide thc ba Tanced output which appears 0n termina1s E4 and (+28 dBm or +30 dBm) Thc va ]ue 0 f resistor R27 controls lhe amplifier acting &s to the Iaic shunt feedback oops around 2A and ZIB conjunction with resistors KII R13 R29 and R30 when the amp]ifier is operating in the ba lanced mnode:_ In the unbalanced mode ZIB ways operates at unity gain inverting the yna to drive the second ha / F 0f the ba lanced oulput and overa1 amp]ifier gain_ in defined by the feedback section 0 F ZIA by adjusting R4 , RI 1 and R13 4-109-1-2

MEG MFG PART NUMBER R27 Resistor XW 5% 510 Philips 4-109G AII parts a$ per 4-109 except a$ noted be Tow PART DESCRIPIION MFG MFG PARI NUMBER R27 Resistor IW 5% 2k4 Philips 4-109-2-5

WBS M464 4k 5k 6k 3k - 8k 2k 10k HIGH .FREQUENCY CUT switch SW2: A|ows to select one of eleven discrete cut-off frequencies at the _high end of the audio spectruma The calibration defines the dB corner point. Filter lope is 18 dB / octave. Ik 12k 500 I5k Hz HIGH. FREQUENCY CUt INSERT swi tch SW4 : When depressed this switch inserts the HF Cut filter- into the gna path and Iuminates assoc iated LED. When re leased, the HF Cut filter i5 bypassed. H 150 220`330 100- 500 70 45 . 2k 27 4k Hz LOw FREQUENCY CUT switch SWI Alows to se lect one of e leven discrete cut-off frequenc ies at the Tow end of the audio spectrum. The calibration defines the dB corner point. Filter lope i5 18 dB / octave. LOw FREQUENCY Cut NSERT switch SW3 When depressed_ this Sw tch inserts the LF cut Tter into the s igna path and Tuminates associated LED. When released, the LF Cut filter is. bypassed. KSMOD IICKD USED ON MATL WBS WARD-BeCK BYSTEMS LTD. DRN: DNM DATE FEB 77 cKD. RyLL ISCALE TOLS PG. M 4 64 FINISH HI PASS-LO PASS FILTER

M464 HIGH-PASSZLOW-PASS FILTER Ga in: Unity _ +0.25 dB from 20 Hz to 20 kHz (with both insert switches in bypass position) Frequency Response: Equalization: High frequency and Tow frequency Cut _ choice 0 f 11 discrete frequencies each . Frequency tolerance: +5% S]ope: 18 dBloctave_ Noise: -80 dBm . (20 Hz to 20 kHz ) Harmonic Distortion: Less than 0 .35% THD from 30 Hz to 15 kHz at +24 dBm input Less than 0 .

1 % at kHz a t +28 dBm input Teve1 Source Impedance: 600 ohms maximum, ba lanced/unba lanced . Input Impedance: 30k ohms +10% _ ba Tanced _ Input Level : -10 to +8 dBm nomina ] maximum_ +30 dBm Output Impedance: Less than 100 ohms Load Impedance: 600 ohms minimum, ba Tanced_ Output Leve] -10 to +8 dBm nomina ] maximum_ +30 dBm Phas ing: Low number termina]s 0 f input and output are in phase _ Power Requirements: Ambient Temperature: +25 volts dc , 120 ma maximum 0 to 60 degrees Celsius 1.6" wide X 7" high X 6 .

5 " deep (41 mm X 178 mm X 165 mm ) Dimensions: 1-1

M464 HIGH PASS-Lov Pass FILIER Input The input s igna ] enters the M464 module via pins and 2 0 f thc edgc connector ZI and 22 serve as the preamplifier RI7 i$ part 0 f the preamp]ificr and i$ used Lo trim the overall ga in of the modu le t0 unity The prcamp output is routed to the input 0 f the LON FREQUENCY CUT filter 4 $ we]1 a $ to one 0 [ the norila Tly closed contacts 0 [ the LF CUT INSERT svitch Sn3 LON_FREQUENCY CUT (high_pass Filter After passing through the isolation amplifier 13 the signa 1 enters thc first section 0 f lhe high pa ss filter comprised 0 f C15 SwiA and 14 , and producing 6 dB/oclave attenuation A further 12 dBfoctave section consi sl s 0 f C18 C19 SNIB , ShIc and 75 resulting in comb ined attenuation rale 0 f 18 . dB/octave SwI a |ows to selecl any one 0 f eleven discrete cut-off frequencies ranging from 27 Hertz Lo 4 kilo Hertz The reference frequency represents thc -3 dR corner point from the nomina 1 s igra] Teve1 The filter outpul i5 cannected to one 0 f the norma!ly open contacts 0 f the LF CVT INSERT switch Sw3 The output 0 f S3 Ts routed to the input of the HIGH FREQUENCY CUt filter a $ well a5 to one 0 f the normally closed contacts 0 f the IF CUt INSERT switch SW4 HIGH EREQUENCY CuT (low pass ) Filter As; is the case with the high pa s $ filter, the Tow pa s$ filter is divided into 6 dB/octave and 12 dBloctave section, for tota 1 0 f 18 dB/octave The dBoctave section consists 0 f Snza C23 , and 26 while the 12 dB/octave scction includes SWZB, SnZc , C27 , C31 and 27 _ SW2 a]lows selection 0 f any one 0 f eleven discrcte cut-off frequencics extending from 500 . Hertz to 15_ kilo Hertz The reference frequency designatcs the -3 dB corner point from the nOm i na ] signa] Teve1 The filter output '15 connected t0 one 0 f the norma y 'open contacls 0 f the HF CUt INSERT switch Sn4 2-1

WARD-BECK SYSTEmS LTD CIRCUII__DESCRIPIION M464 HIGH PAss-Low Pass FILIER Output The output of Sw4 15 connected directly to the 4-109a output amplifier The actively balanced output 0 f the 4-109 15 broughl oul aL pins 15 and 16 0 f the edge connector INSERI Switches ad Indicators The LF CUt INSERT swilch Sw3 and thce HF CUT INSERT switch SW4 may be selected in any desired combination The filter section inserted into the signa] path will bc indicated by the LED indicator adjacent to cach insert swi tch Power_Supply Decoupl ing An active power. supply decoup] ing nctwork consisting 0 f Q1 through Q6 : provides high degree 0 f isolation between the M464 and the +25 vo It suppiy ra i 1 $ Transistors 03 and Q4 serve d 5 current mon itors and Wil7 imit the current flowing through the pass transistors Q1 and Q6 in the event that excessive power supply demarids should arise 4$ resu]t 0 f component failure 2 -2

WAAD-BECK SystemS LTD; EREQUENCY RESPONSE CHARACIERISTICS M464 HIGIL PASS-Low PASS FILIER + 3 OdR 73 ~12 -15 8 2& # 8 18 -21 Low FREQUENCY CUI ~24 10 Hz 100Hz Ik 10k +6 +3 OdB -3 -12 -15 18 -21 WIGH_FREQUENCY CUT 724 20Hz 100 Hz 1kHz '1Ok 20k 30k 40k 3-1

WAAD-BECK SYSTEMS LTD_ PARIS LIST M464 HIGHLON PASS EILJER_MODULE PART DESCRIPTIQN MFG MFG PART NUMBER C1 c2 C3 C4 c5 Capacitor 22 uF/25 sjemens B41313-45226-2 33 uF/10 V Kemet T3900336M01045 C6 C7 C8 c9 C10 220 pF 4.1 pF 220 PF 6 . 8 pF Philips 2222-630-03221 2222-638-09478 2222-630-03221 2222-638-09688 CIT C12 C13 C14 C15 150 pF 33 uf /10 V 2222-638-70151 T3900336m01a5 Kemet 10 pF 0 .04 uF , +5% Philips Aselco 2222-638-10109 WBS 13-002 C16 C17 C]8 c19 C20 0 .47 uF/35 V 8 . 2 PF 0 . 04 uF = +52 0 . 02 uF +53 0 , 47 uF/35 Kemet Philips Aselco T3904474m035a5 2222 638-09828 NBS 13-002 WBS 13-003 13904474M03545 Kemet 621 C22 C23 C24 C25 22 pF 150 ur/6 V 4000 pF +5 % 0 .47 uF/35 Philips Keme l Aselco Kemet 2222-638-58229 1390E157m00645 WBS 13-005 T3904474m035a5 C26 C27 C28 C29 C30 10 pF 5000 pF 45% 0 : 47 uFi35 V Philips Aselco Kemet 2222-638-10109 VBS 13 - 007 T3904474m035a5 8 . 2 pF Philips 2222-638-09828 'C31 C32 0 . 01 uF 152 33 uF/io Aselco Kemet WBS 13 -004 T390133611010a5 4-1

WAAD-BECK systems LTD: PARIS_LISI M464 HIGH/LOM PASS EILTER_MODULE PART

M464 HIGH PAsS/Low PASS FILTER a) Remove the input signal and measure input noise Confirm an absolute output noise level of -80 dBm or better measured over bandwidth of 20 Hz to 20 kHz . b ) Insert the Low and High Pass filters with their cut frequency selectors positioned at 15 kHz and 27 Hz respec_ ti vely = Again, confirm an absolute output noise level of -80 dBm or better Switch both filters OFF_ a) Switch on the LF cut (High Pass) filter (LED indicator Mlluminated) b ) Apply input.

150 Hz, dBm, 600 ohm signal to the test jig c) Rotate the LF cut switch to the 150 Hz position (detented) and confirm the output Ievel to be -3 dbm +/ - 0.5 dB d) Decrease the input frequency to 75 Hz and confirm the output to be -17 dBm or less e) Increase the input frequency to 300 Hz and confirm an output level of dBm +/- 0.5 dB _ Note Other LF cut frequencies can be tested using the procedure listed above.

The frequency selected on the LF cut switch represents the -3 dB corner point from the nominal signal level at one octave above. The output level should be ttenuated by approximately 18 dB one octave below the cUT frequency selected_ f) Switch off the LF cut filter. 8 a) Switch on the HF cut filter (Low Pass) 6 ) Apply dBm, 600 ohm signal to the test jig input.

c) Rotate the HF cut switch to the kHz position and confirm the output level to be -3 dBm +/ - 0.5 dB _ d) Increase the input frequency to 10 kHz and confirm the output to be -17 dBm or less _ Page of kHz,

M464 HIGH PAsS/Low PASS FILTER e) frequency to 2.5 kHz and confirm an Decrease the input level of dBm +/ - 0.5 dB _ output can be tested using the Note: Other HF cut frequencies The selected on the HF cut listed above. frequency Brocedure -3 dB corner point from the nominal represents the below The ou tput level should be signal level at one octave 18 dB one octave above the cut attenuated by approximately frequency selected +30 dBm, 600 ohm input signal Confirm a) Apply kHz, output level of +30 dBm w i thout clipping.

maximum current at +30 dBm out. confirm nominal b ) Measure supply current of +95 mA _ and total harmonic distortion Note To test maximum output capability of +30 dBm is required_ signal source with an output amplifier may be used in this The WBS M6O5A distribution application level to +24 dBm and measure total a) Decrease the input should be less than 0.35% from 30 harmonic distortion which Hz to 15 kHz .

9 10 _ b ) level to +28 dBm and measure total Increase the input distortion at kHz which should be less than haromonic 0.1% _ and Low Pass Filters with their cut Insert the High positioned at 15 kHz and 27 Hz selectors respec_ frequency tively Repeat step 10 _ b ) . c) Page of

M464 HIGH PAsS/Low PASS FILTER REFERENCES: M464 SERIES MANUALS Inspect module for correct assembly 2 a) Insert module into WBS M462/4/6/7 TEST JIG b ) Place High Pass and Low Pass filters in the Off position_ c) Check supply current (idl ing, no signal applied) _ With the 8-109 assembly in place, confirm current of 40 to 50 MA _ nominal ii ) With the 8-109 assembly removed, confirm current of 25 mA _ nominal Check DC voltages on the 6-110 motherboard assembly reference, no signal applied) (for PIN # 21 , through 27 25 -20 -21 -21 -21 -20 -21 +21 +21 -20 Q1 Q_ Q3 22 .8 21 .6 21 Q Q5 Q6 -24.4 -24.4 -22.8 -22.2 -22.2 -21.6 Vc Vb Ve 24.4 22 .2 21.6 24 _ 22.8 22.2 -22.8 -21.6 -21 With the Filters switch off apply kHz, dBm, 600 ohm signal to the input binding posts of the test jig.

Confirm an output level of dBm +/ - 0.5 dB _ Note: Both input and output are actively balanced and intern- ally terminated, therefore the test equipment should be bal- anced, floating from ground_ and present bridging load 5 _ Adjust the input level sO that the output is exactly dBm and check frequency response from 20 Hz to 20 kHz _ Confirm that the output level remains at dBm +/ - 0.25 dB .

Page of ISSUE APRIL/83

M4 6 4 HIGH/ lO W PASS FILT ER MODU LE I PART DESCRIP TIO N MFG MFG PART NU MBE R I ZI Z2 I nteg ra ted Ci rcuit " Na t i o na l " LM30 1AN " I 13 " " " " Z5 " " " S ign l! ti c s " NE5 31V I Z6 " Na t i o nal LM30lA N Z7 " " " I I I I I a .c ps BS W :// tp ht

4-6

W A R O - B E C K S Y STEM S LTD .

4- 109 AMPLIF IER SERIES

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WARD-BECK SYSTEMS L T D .

DFSCRIPTIO N 4- 10 9 AMPLI FIER SfR1 fS

The 4- 109 s e r t e s o f a lllP1 1f le r s are p r i nt.ed c ircuit board un t t s whi ch a r e ut i li zed a s a n i nter na l co~ pon ent in ce rtai n WBS 450 a nd 460 se rie s Mo dules. Each 4-1 09 a Mpl ifier mou nts as a pl U9 - i n uni t on t he Mod u l e Mothe rboa rd. The 4- 109 aM p l i f ie r pro vi des a n ac tively bal a nced output wi t h +28 o r +30 dB. capab l lfty and is e Mpl oyed as an output or a boos t er aMpl i fi e r with eithe r an unbalanced or a ba la nce d I nput . Th . f oll ow i ng spec t fi ca t ions apply to tho 4-109 a.p1ifie rs. UNIT I NPUT GAIN MAl. OUTPUT 4- 109 Sa 1anced l S dB ' 30 dB. 4- 10911 Unbala nced 1 dB '30 dB. 4-10 9B Balanced 18 dB >3, ORo 4-1 09C Balanc ed 39 dB ' 30 dB. 4-1 090 4- 1a9E Unbala nc ed Balan ce d 29 dB 29 dB ." >3, dB. dB. 4-1 09F Bl lance d 33 dB '30 dB. 4-I 09C Ba la nced 23 dB ' 30 dB.

freq uen cy Res po nse: !0.2 dB fr OM 20 Hz to 20 kHz.

Noise: -l i D dB. [ I N f r om 20 Hz to 20 kHz. Har lllon f c Disto r tfo n: l ess th an 0.251 TlI D f rOIl 20 Hz to 20 kHz at Ma ximum output ( typically 0.02S). Out put I ~ pe dance : le s s t ha n 100 ohms. l oad I mpe da nce : 600 e nes . Power Requi r e me nt s : t 21,5 volts de . 18 iliA qu t e s cen t cu r rent , 95 mA at +30 dB m outpu t into 600 ohms l oad . a .c

Ambient lemper ature : o t o 60 deg r ees Ce ls ius. ps BS

Di me ns i o ns : 3.25 " X 3. 36 " X 0 .57 " . (03 mm X 86 mm X 15 mm l. W :// tp ht

4- 109- 1- 1

WARO-BECK SYSTEMS LT O . I I DESCR IPTION

4-109 AMPLIFIER SERIES 4-109 PART DESCRIPIION MFG MFG PART NUMBER c1 C2 c3 C Cs Capacitor 1000 pF 33 uF /10 V Aselco Kemet CQ92-MC-102m T3900336K01oas uF/35 V 0 015 uF T390B105k03545 cq92-Mc-153m Aselco C6 G/ C8 C9 C10 Delete 1000 pF Aselco cq92-MC-102m 220 ur/10 V Delcte Kemet 1390F227k010as CII C12 c13 CIA C15 ul/35 V 0. 015 uF 1000 pF Kemet Aselco T3908/05k0355 Cq92-Mc-153M CQ92-Mc-102m 220 uF/10 V Kemet T390F227k010a5 C16 C17 C18 C19 47 pF Philips 2222-638-70479 2 PF 2222-638-03278 CRI. CR2 CR3 CR4 Diode Fairchild 1N4148 LI L2 Choke 100 uh Aselco 5 189-2 . 76 Transistor Nationa ] Pn3569 Pn3o3] 2N2102 PN3569 8 3 6 88 7 2n4037 PN3645 2N2102 4-109-2-1

WAAD-BECK Systems LTD_

4-109 AMPLIHER SERIES 4-109 PART DESCRIPIION MFG MFG PART NUMBER RI R2 R3 R4 R5 Resistor %W 5% 47K 47k 6K2 6K2 6K2 Philips R6 R7 R8 R9 RI0 6k2 18K 18k 820 110 RI T RI2 R13 R14 RIS 16k Delete 2k 15k 47k RI6 RI7 RI8 R19 R2 0 1k 470 270 15 270 Yl 5 % XN 5% R21 R22 R2 3 R?4 R25 IW 5% 4W 5% 15 470 4k7 15k 47k R26 R27 R2 8 R29 R3O 1K Delete Delete '16k 2k R31 R3? R33 R34 R35 10 15k 4/k 1K 470 4-109-2-2

WAAD-BECK SYSTEMS LTD PARISLIST 4-109 AMPLIFIER_SERIES 4-109 PART

M464_HIGHLON_PASS_ FILIER_MODULE PART DESCR [PT[On MFG MFG ParT NUMBER R21 R2z R23 R2 4 R25 Resistor %W 5% 620 TM 620 2m2 22k Philips R26 R2 / R28 R2g R30 15K 10k 10k 10ok 100k R3 R32 R33 R34 R35 620 (delete) Resistor kW 5 % 560 Tk2 IM R36 R37 R38 R39 R40 IM 30k 15k 620 22K R41 R42 R43 R44 R45 10k Resistor I 5% 10K Resistor 1/8W 5% 82k 39k 18k R46 R47 R48 R49 R5O 15k 8k2 5k6 4k7 4k3 R5] R52. 1k8 910 4 -3

WARD-BECK SYSTEMS LTD PARTS LISI M464 HIGHLLOV PAss_FILTER MODULE PART

All Ward_ Beck Systems Lt d . p ro duc ts a r e war ranted a ga i ns t defect ive mete r Lal s. a nd workman ship f or a pe ri od of one yea r fr Oll1 date of shi pment . Ward_Beck Systems wi l l r epo r .. or re p l a ce, a t I ts op t ion, without charge, a l l said p roducts o r par t s t here of whi ch, up o n f ac t ory inspection, p rove to be de f ect ive dur ing the wa r ranty per i od pro v i de d that : a) Origina l seri a l numbe rs are intact a nd have not been t ampe r ed wi th . b) The pu rchaser sha l l r etur n a ny equ ipmen t o r parts the reo f t o Wa r d-Bec k Sys tems only a fter obtaining prior a u t ho ri ut i on a nd sh ipp ing in- s t r uc tions fr om t he fact or y. Wa r d-Beck Sys tems eese e ve s t he r l l ht t o I ns pec t o r r epa ir on the purchaser 's p rem ses , c) The p u rc ha s e r a s s urroe s t he ob i iga tl on of all expenses Incu r red In c o nne cti on with sh ipping and re t ur ni ng such goods. once a u t ho r i za t i o n has been obtaine d . This warra n t y does not cover items norlll8lly conside red expendab l e such as fuses an d l amps. Thi s warra n t y does not cover damages caused by misuse, acc ident . neg l ec t. unautho rized e l t er-a tlcn, r e pa ir by unauthor ized pe r s o nnel , o r damage caused by ac t of God, war or clv ! I i ns urr e c ti o n. I n no event sha l l Wa r d- Beck Systems be l Lab-Ie for conse- quent ia l damages. Wa rd-Beck Systems s hall ha ve the ri ght of f inal dete rmination as to the a pp lica b ili ty of t h is wa r ranty . Wa r d-Bec k Systems r e se r ve s t he right , at any t ime , to make changes i n equ ipment, coeeoncn t specifica t ions an d des ign a s may be warra nted by prog r e s s i n technology . a .c ps BS W :// tp ht

WARO ·SECK S Y S T E MS LT O.

TECHNICAL DA TA M464 HIGH ~ASS - L O W PASS FILTER

Gain : Unit)'. Frequen cy Respo nse: 10 . 25 dB fr oll 20 Hz t o 20 kHz ( wf t h bot h in se r t swi tc hes in bypass pos iti on ) . Equali za t i on : Hig h fre quen cy and low freque ncy t ur , c ho ice of 11 discre te f reque ncIes e. ch . Fre que ncy t o le r ance : i SI . Slo pe: 18 dB / octaye . Noise: · 80 dB.. (20 Hz t o 20 kHz ) Ha raonic Oisto r t1on: le ss t hin 0 . 351 THO fr o. 30 Hz to 15 kHz at .24 dBIl input. Less tha n O. II ,I t 1 kHz a t t I S dB. i nput level. Source IQpedan ce : 600 ohas C1axi llua , ba lanced/u nbalanced. Inpu t l ape dance; 30t ohas flOl, bala nced . Input Leve l: - 10 to t8 dBIl nue tnat . +30 dBa aa xi a ull. Out put l ap ed an c!! : Less t han 100 OhMS. Loa d Impe dan ce : 600 o h~ s Ill ln l llua, balanced. Out put Level : - 10 t o +S dB. noa l na1. ' 30 dBa Ilaxhl ua, Phasin g: Low nUllber te r . l nal s of inp ut and outp ut ar e in phase. Powe r Re qu1relllents: 1 25 volt s dc, 120 mA ma xlmum, Alll b i ent Temperat ur e : o to 60 de9 r ees Celsius. Dlmens io ns: a

1 . 6" wid e X 7 " high X 6.5" dee p. .c

(4 1 mm X 178 mm X 165 mm) ps BS W :// tp ht

1_1

WARD-BECK S Y S TE M S LTD .

CIRCU l T DESCR IPTI ON M4 64 HIGH PA S S-LO ~ PASS FI LTER

Inpu t The i nput s ig n"l ent er s the "4 64 aod ul e y i" pi ns 1 a nd 2 Of the edge co nnec to r. ZI " nd Z2 se rve ~s t he pre" ap l i fie r. RI 7 is part of t he pr eampli f ier ~ nd i s us ed to t rim the ove ra t t g-a i n of th e ao du le to un ity . The p re~m p ou tp ut is r ou t ed to the f npu t of t he l OW f R ~ Q U E" C Y CUT fl l ter " s we l l a s t o one of the nora"l l y c los ed co nt ac ts of t he IF CUT INSERT sw i tc h SWJ. l OW f REqUEN[' CUT l!!1gh pass) f i lt e r Af te r passing throu gh th e i s ol a ti on "mpl if i er Z3 , t he si gn. l enter s th e flr st s ectio n o f t he hi gh p ~ s s f i lte r , COMp ri sed of CIS, SW1A an d 24, an d pr od uc in g a 6 dB/oct ave "ttenua t 1on . A furt her 12 dB/oc t ave sec t lo n consist ~ of C1 B, [19 , SII 1B, SII1C ~n d ZS . re s ul t ing in a co mbined ~t tenua tlon