F-1039A_635V-1_band_pass_filter_review_1973.pdf

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1、BYGORDONELIOTWHITE* WIIATismadeby Collins RadioCo.,has a quantityofsand init.andis used inaircraft? 11y surpluslind this monthfits thatinter- esting description.forit is.an F-I039A/ U digitallytuneablehandpassfiltercovering 2.000 to29.999 mHz. The sand is a hellsinkin aservo-ampli- tier module.This

2、was a jolt tome,afterhear- ing for years thatsand was to be keptOUIof delicate electro-mechanicalequipment.Col- lins,however, sealsthesand inthemodule with threadedcaps on eachendoftheIWo- inchtubinucontainer, and thethreadsarc - scaledwithSilastic 7.11RTVsealant.Ap- IS02 Stonewall Rd., Alexandria,

3、Va. 22302 parentlytherelativelydensesand conducts heatbetterthanpollingcompound,orCollins wasproviding apolling substancewhich could beremovedto allowmaintenanceof thecomponents,Thatis athoughtfulthing, sincemost pottedcomponents arcthrow- awaysifoneresistorgoesbad.Itis almost impossible to takethes

4、olidpottingmaterial 01Ttheindividualcomponentswithoutdes- troyingthem. TheF-1039A isairbornegearwhichwas probablyused onanair-command post for theStrategicAirCommand,wherethere were all sortsofcircuits inconstant-occn- sionally conflicting-usc, Its function wasto allow a receiver tooperateadjacentto

5、a high- poweredtransmitter,as close astenpercent in frequency, with a powerof1,400voltsr.f. Knownalso by civiliannomenclatureof 635V-I theunit is remotelycontrolled,and contains asharply selectivebnadpass filter with integral linearradiofrequencyampli- fiers:Itcan receive and amplifyextremely weakr.

6、f.signals,despitethepresenceof ncarbvtransmitters.Iteliminatescross- - , The F.l039A(6 3 5 V.l) Ba ndpassFilteris shown on top. Theright-side view is shown on thebottom right withthecoverremoved andthe Ieft.sfdeviewwith thecover removedis shown on the bottom left. . , - r , , . , , , - 86COMay,1973

7、I : , : Exteriorandinterior views ofthe9 14B-3remote control headusedtodigitally tunethe filter unit, - .- L . I .,-. ., . . - modulation and intcrmodulation.and pro- vides protection against r.I. overloads to itself and its associated receiver. ThefillerWHSdesigned to be used with the Collins 61X T

8、 single sideband aircraft receiver which covers the sametuning range. The remotecontrol, digitally tuned, with level controls. and a reset button for ther.f.- protection circuitbreakeris shown in the phOIO_ Thisgoodie incidentally,isavailable from ACOMElectronics, in Hawthorne. Calif- orma, Amateura

9、pplicationsofthe filter might in- cludebotheliminationofnoise andhash in the high-frequency bands in electrically noisy locations, protectionofreceiverswhentheir antennas weremountedonbuildingsncar othertransmitting stations includingbroad- cast stationv usc in a repealeroperation,or simply usc as a

10、 pre-amplifier, as the unit has a vcnvitivitv ratedat 0.25 microvolt input at 2 111Hz for10dbsignal plus noisetonoise ratio in a2_7 kHzbandwidth.Thisshouldhopup most amateur receivers.Evenat29.999mHz the scnsitivitv fallsofTonlv to 0.6 micro volt forthe sameSfratio. Gain in thenormalsettingofthe con

11、trol isbetween 6 and 18db.(Thelowposition reduces gain 35 db Inputandoutputim- .- AN /GRR5 RECEIVER J8.1000MHZ AN/ALRS:ConIof!Iandnttunertun crh:TCV2531)(Inoflnalf.,oIpalandIneve. u.-d. ch.ed 0-,t.h tUOCf IIh.farlUl1nJl.I.,.h. .out, h.,.l.I h. .n. . o pe nedhuldSENSITIVITY;II UOIl .11( 4mfv.(lQat I

12、Hmh/ .5OIl5)Kmh/.4: Jt 77 Kmh/.7 JI Ip:hlIh.rc- fl.IH1 Iad ual!)01)0rnhlIIJmplllhallthat !ollu .tn- dud,a.hod.,Ilktl1 1.,Id aIIlale-dIn h d h hrhI74db,r.I1.I.dhIn( povnon:IJn.Id.A.- 1. J1r uh.wuch,k dpOI I !(HIlilltl:!mhr, andSELECTAMOfFMIllhlIalld Ill,lnd(lIP!1:!:!4:!Omill .57S.00 NEMS-CLARKENo.167

13、011K1552,(1111/ .II!., ,.0,.5275.00 lNWVRcr/Comlof:!Il111/.y,-ope.52S0.00 RECEIV ER/COMPA RA TORFOR60KHZlNWVL lantlald Ill10111;11InIIIlulhonwtthIn. ,nIwtllllat.r.S49S.00 A1l8nl,on 80V81o.En,advancedTechnlCn: WIhdllf! hIbesttr$Ilqu,pment.tUpJlliT IO,CT,id.hand, from an)rcvrOK grtd.book$137.50 BRANDN

14、EW FA EOSHIFT TTY MONITOR: NAVYOCT.J. 11RU I11type. h l4unIttl:!h1111In4 hamh. .-unl Iunm,.ClY,lalcahh,Rlad,up ro15tHIIIIoJclallunun hf,ulHn 1VI.(n,t ;I IOn.00larhInufllnalbov.,h InUUll.bool,tl1In.,nal reeded: 15m;,hlppIn,t.IIlIIIS9.!)0 HIGH-SENSITIVITYWIDE-BANDRECEIVER COMMUNICATIONS.BUG OETECTION

15、SPECTRUM STUOIES 88COMay,1973 pedancesarc50ohms, unbalanced(coax fillings) . The unit comessupplied with one ofthree power supplies. usable on28volts d.c.,115 volts a.c.,400Hz,or115volts a.c.50to400 Hz.Fortunatelythe oneIhadtowork with hadthe50-400Hz power unit (Collinspart number5280644001.)Thismad

16、e thecon- version a snap-just finding theproper plugs and hooking it up. Otherspecsonthe unit are:weight 24 pounds, size5 X20X7V2inches (fitsV2 ATR aircraft rack). TheNavShipsmanualis0967-120-9012, andthcrcis a Collins,manualonthe civilian 635Yversion, which is identical. R.f. input is fed to a doub

17、le-tunedcapaci- tor/inductorcircuit, amplified,andagainfil- tcrcdin a secondtunedcircuitbeforebeing fed10a final r.f. amplifier and thence to the receiver.Thecircuit uses three type 56R7 nine-pin miniature twin triodes in cascode amplifier configuration. AccordingtoCollins the circuit gives exceptio

18、nally linear low noise amplification. The second tuned circuit filter section is of lowerQIhan thefirst because il is loaded withSwampingresistors(R,.R28 R:!I. Ra;-,). Reader John Hutchings suggestsit might be possible to sharpen the responseby removing the swamping resistors(82K, 47K, 10K,and10K )i

19、n the second section.This is located in asmall(5x2.x 21;2) aluminum boxatthe front of theleftsideof the unit. Getting at the resistors looks difficult.This modificationhasnot actuallybeentried. Mostoftherealcomplexityo f the F-l039Ais in its luningcircuits. II is remote- Iy digitally tuned,andthat n

20、ecessitates digi- tal-to-analogconversion,servosystems,and allthatkindofnice stuff. This isaccom- plished by the familiar servo loop, witherror voltages. servo amplifiers, and feedback10 achieve zeroerrorvoltagewhenthe set is properly tuned. The power supply. whatever its input vol- tage,contains a

21、rectifier bridge and a400Hz power oscillatorwhich feeds atransformer tappedappropriately to provide the necessary working voltages whicharethen rectified, filtered.andregulated. To protect theunit and the receiver, there is an overload relay. K 1 whichopensduring bandswitching,andwhenever high r.f,

22、vol- tagesmaybe present on the antenna. SCR284 SCR506 SPR2 TBW .IAOVTOGO ,_.,. - ._,.c.o_ - $250 BC640 BC728 RAX SCR274 COWANPUBLISHINGCORP. 14Vanderventer A ve.,Por tWash ingt o n, L.l.,N. YI I O!lO16883 62 00 Partial list o fcontents ARCIART13 ARC3BC189 ARC5BC344 ARC7BC610A and many. many more. Th

23、is is a bookliterally loaded withschem- aticsforallthe currentlypopular pieces ofsurplusgear. Most amateurs are well aware o f theproblems encountered in pur- chasingseeminglyinexpensivesurplusunits. onlytofindthatnoschematicdiagramis available. CHEMATICSHANDBOOK GVcmsW2D17Electronics E5akFfIX b5000

24、I 2/12i 201-647-3639 WE PAYHIGHESTCASH PRICE FOR ELECTRONTUBES&SEMICONDUCTORS IMMEDIATEPAYMENTON UNUSED TUBES H&LASSOCIATES ELlZA8ETHPOAT INDUSTRIAL PARK IfLIZAeETH. NEW JEASEY 07206 (201)351.4200 TIlCI_All ,.lac._ TOfIOOc. v TOOJrMIIICTUfIf CATLOGST- 302YPassaicAve.,Stlrllng,NJ07980 WANTSTOBUY Alltypesofmilitaryelectronicsequip- mentand parts.Call collectforcashoffer. SPACE ELECTRONICS division of MILITARYELECTRONICSCORP. 76BrooksideDrive,UpperSaddleRiver NewJersev07458I12011327-7640. laClllfl-.U_ STVLUS.ClI_ OTMlfl.n11I01 - 90COMaV,1973