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9304 Combining Cross Pole COMBINING CROSSPOLE SIGNALS BEATING NOISE TAT]PO'S SOLUTIOI{ TO NO TV3 TECH BULLETIN 9304,IISSTTED 15 SEPTEMBER 1993 COPYRIGHT 1993by ROBERT B. COOPER A FEW WORDSFROM THE PUBLISHER LEARNINGt'R0M THE PAST .. NUMBERS... C00P's TECHN0L0GY DIGEST . In N'Iarch of 1977 the Secretaryof the (NZ) BroadcastingC-orporation was (Mr) Keith Ha)'. f'\'1 was available to most New- Zealanders;TV2 (then called South Pacific Television) was availableonly in ma-jorcentres. Taupo was from 5 to 7 years'downthe list'to have TV2 coverage. Taupo tele-u'isiontechnician Ian Foster (Lakeland Sight & Sound Ltd) knew TV2 signal was available on selectedhilltops surrounding Taupo. He also knew how to get it down into town. Llnlilie the BroadcastingCorporation, Foster was read-vto do it; then, in N,{archof 1977. In the spring of 1993. many portions of New Zealandremain without TV3 service. Perhaps Foster's1977 answerto f\,'2 (followed with modificationsin 1990 when Taupo also startedTV3 ahead of its neighbouring communities)will inspire you to do somethingabout the lack of TV3 ooveragein your area.It's in this issue. \Vhile researchingthis report we ran acrossa musty notice in ROG (RFS) files written by Keith Ha1' s.rly in N,{arch1977, the same month Taupo began its TV2 'pirate' translator service. The 1977 policy regardingthe annual BroadcastFee is surprisinglycurrent with today's New Zealand On Air policy. We thought vou'd enjoy reading in context what Ha1' wrote more than 16 years ago: "The license-fbe is legally pqvttblefor the right to operate a receiving set and has never been related, in either radio or television, to the extent or quality of the sewice av.ailablein ct particular localitv. The concept of a vcriable ltcense-fee has been examinedin the past and relectedas neither equitablenor practical. If the cost to the individual is to relate to the standard r:J'semicehe receives,in.fairness to all, it must also relate to the cost of providing him with that service. On this basis many pra,incial or rural license holders would be liable fo, o fee up to .forh" times that which could belustified -for viewer,sin urban areas close to major transmitters.In practical terms they could receve no sertice at all if its crtstswere not large$, borne by those more .fbrtunatelv located. The most equitable approach, therefore, is to charge a ,;tandard fee and allocatethe revenueobtained to provide the bestsertice for the greatestnumber of viewers. "The impracticalih; oJ-the concept of a variable licenseJbe lies in the massive increase in administrative costs it tvould entail. ,1 specialist staff would have to be engaged to access comparat:e standardsfrom district to di,strict and a complex systemof rebates and surcharges w'ould have to be ,tpplied as standards were imprtned in a particular locality, or when the holder of a license ma,ed .from one class of reception area to another. In the final analvsis, all this additional expenditurewould have to be met by the broadcasting revernte,and would necessitate "Those a substantialincrease rn the licensefee." 1977 ... 1993; TV2 ... TV3. who fail to learn the lessonsof history are doomedto repeatit." Page36, Tech Bulletin 93031column 3, lines 8 ancl9 shouldbe correctedto read "...for 700 metresis 108.95km;191.32 km totallength i1-...". Our companionpublication Coop's Technology Digest lbr 20 Septemberreports the real limitations of fibre optic technolory in New Zealand;and, updatesthe btinding speed at which digrtal video compressionis developing.Don't miss out on thcse important reports. If you did not receivea FREE samplecopy of L-oop'sTechnolory Digest for August, write or FA,X us today. A very small quantity of this digital television issue remains available. TEL-I{ BLII-I-ETIN 9304 - Pase 1 'I'hcn. 'zap' T'T]('II BTII,I,ETIN 9304 seconds. suddenl-v. the picture is ENTICATTSI|S .\ND ('TRES olcar (the static has dischargedbaok into the atmosphereor to ggouncl;and the noise slorvly ,,\n1'lvpe or classot'receir,'er receir,ing builcls up againto repeatthe c.vcle. anv lomrat o1' moclulation can be adr,'ersell' all'ectecl lr,n Raclio Frequencv lnterlbrencE ''\nv signal which degrades thc desircd (RIrl). ,\ny' t1'pc or class of transmitter can receptioni;oulcl be classiliedas RFI. Your-ioh is gcncrate RFI. There is no such thing as a to flrst cletermine the nature of the intcr- receirrcror a transmitterwhich is 'RFI proof. lbremce. then to cleterminchow it is getting 'into' ln fact. anv derice operatedb,v electriciry' the receiver or electronic systorn. ancl (rvhether liom AC power mains or a sell' trnalh' to locate the source ol the noise and containedbatten') can be a'transrrritter':cven an either repair the tault at the origination end. or 'fhat's incandesoenttight bulb. The list of 'possible' filter out thc intcrferenceat the receiver. transmittersis r,'irtuall--vas endlessas a oomplete rvhat this issueof Tech Bulletin is all about. list of cve_$rdefqe conccivcdb1' man to operate .fHE fiom electrii;it1'tand that includes ob-jectsvou TR-ANSMISSION OF' EN{I lvould never associate with transmitting. A Radio Frequencylnterfbrence (RFI) may in coll-ee-iug. a washing machine. a light srvitch fact be TVI, Television Interference.Or. it climmer control - lili.e thousands of modern might be inted'erencc to a stereo system, 'gadgets', eaoh has the potential to generate interf-erenseto an intercom system or even a radio signals. lrven machinery that does not telephone. The catchall tcrm for all fbrms of operate directly' from electricig, such as a interference is Electromasnetic Interference: gasoline fired combustion engine, produces ENtr lbr short. often large amounts of radio transmission EN,IIcan travel from its sourceto the point or 'noise'. points where it createsdamage r,ia any of three ft these 't'amilies'of potential RFI generators routes: rvere not enough to render purposcful reception 1) Radiation: T'hroughthe air ('ether')-iust as impossible,there are still more souroesof RFI. a radio or TV signalpropagates, 'I'raveling A totally passiveobject such as a t-armer'sshed 2) (lon@Shoa: through some sort covered lvith galvanizedtin has the electronic of wired network. such as the power lines, 'receiver' abili$ to act first as a for two or more 3) lnduction: Ry magnetically'coupling' be- 'mi\er' local radio signals,and then to act as a hveen either its source and its target, or by of these two (or more) signals creating yet a 'coupling' fiom a conductor (power line) to a third (brand new) radio signal that is the target (inside of a stereo set) having first mathematicalsum (or difference) of the two (or penetratedthe target device by being oonducted more) 'mking radio fiequencies'. 'inside'. Er,'ennature itsell createsRFI. ,,\ thunder- Becausethey go everywhere,power lines are 'noise' storm rvithin 200 km will generate on the primary 'conductor'of EML An interference fringc and ncar-fiinge f\i signalsin band I; on source can be conductedor 'induced'into an band Itr signalswithin 50 km and on band [\,I,lV overheadpower line and then be carried several 'I'ests signalsrvithin 20 km of the storm. A heary rain kilometres b,v"the porver line. we shall pounding on a rooftop television antenna will describe tell you quickll' the power line is 'charge' often the TV antenna with static carrying the L,MI; only a bit of skillful detective 'static' electricitl'. This appears as a steadi$ work allows you to 'backtrack' the EMI along 'picture increasing amount of snow' on the the power line to its actualsource. \\tren power screenover a period of time spanningl0 to 90 linesact as'conductors'forENfl. thel' are often l F.('lI Ilt [.] -111'N 9.]04 - Pase 2 llFI: I)irect sourceradiation, power line couplingltransmission,and inductivecoupling TNTEAF€RENCE 6\ sOUFCE V I ((llt QUICK noiselevel rneter. plugs into earphrlrrciack on receiver 'cause' incomeotlvblamed as being a of EMI. tunatetvas you unplug the lead not onh will the \,\hile it is hue that power lines can generate EMI go away but so too will the desired lrN'II. more often they are merelv the signal(!). At this point you must temporarily msssengcf. modiS the ALI line circuit with a purpose-built line filter designed to trap (stop) EMI tiom HO\A] IS IT GE'I'TING IN??? being passedthrough on the mains line. F,vcn belore you know what is causing the interfirence. ]'ou should determine how it is SAI,{PLE (basic design) LINE FILTER getting into thc device displaying the inter- f'erencc(such as a radio. a stereoset, a TV set). Rv knowing how it enlplq the 'appliance'you rvill begin to eliminate possible sources of the EI\4I. and. nan"ow down to a handful the 'fl\es' number of optional you can employ to cure the problem. 'fV A radio (ANI or FNI). a set typicallyhas 'outside two,or f'ewer wkes'. Cineof theseplugs into the AC mains.another would connectto an aedal externalto the set. The EIT,IIenerry may be entering the ailbcted set through the ACI mains lead. through thc antenna wire. or in situations rvherc the EN,{I source is physically cluite ckrse to the allbcted unit, directly into the glrcuitry of'the unit by' radiation that originates Simple line lilter. Dual wrnding coil wound outsidethe cabinet. on ferriterod (J.W. Miller FR-500-7.50or 'outsidc Thc easicst wire' to disconnectis the Amidon R61-050-750.Wires (no.18 gauge) :terial"antennalead. If the EMI ceaseswhen the are wound in parallel, on notched core at lead is disconneoted,you can probably safety same time. Ends held in place with trruine, assume the AC power mains is not the El!tr epoxy. Mount in metal enclosure with conductrx'.
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