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up-to-date electronics for lab and leisure- ELEITOR” B SSB receiver a simple low-cost design super PLAM AM receiver with PLL DNL tape noise reduction system March 1976 40p E ich TV Bona Uni sein Eletro. 2 TF bear 1578 e e 20 Qi le esco ss cm Da a a dt entro sing 8, 6 eh or TV ut to VP nd i ] : É H if É z z ! 3 É ê ê z É E Ê Hg ã tv tennis extensions (1) ssh receiver te sound — im brief . tisound frontond adapter ... Toa un power supply for varicap tuner “dynamic noisolimitor tupitun-dug-dus.. integrated voltage regulators (1)... ie missing link > oãfhflãa e ELEKTOR BACK ISSUES ARE STILL AVAILABLE Tais is a selection from the contants of the bai gue rr a number 2: The apolictions and aclvantages of phase locked loop [PLL) systems have already beem discussed in Elektor (Elektor, April 1976) In this article a practical design is discussed for a suporhet recoivor featuring a Phasa Lockad demodulator for AM signats, hence the name, The receiver is vrsatie in that it allows the user to choose between. awide or narrow if. pass hand, and also between a conventional envalopo detector or à novel synchronous detectar using a PL, Design Problems. The ain eooblem to be ossrcome sta desgaoe a Medium Wave receiver é Mat ob wavelamd congeiom. À dir megni. for Irequency. alocaiona, and o some starlons, so resulte n the older al de apparen om the mediom ave Da today. rn a qual seta Sae rm Rea vo, As the iron da makes to be ONA Cxcept by iateimalional ie ent om Le proper axo of fe medium to band Gu as Gunn to 885) vas decided, in the present dos, nor to Accept hs sort of Compiomao” e xt ti he om pose Téo bamdmaero under Tavouable ae. epelon conditias, wo under poor ent channel iteterenco. The moerer lia fustuca tro dfcienr types Dr Seletor a PIT, eynehronoas deter When desiandna th tece it tas ta E imo considerem that tão home consanetor na at have vogtó ted test gear at tis deposl, 5o ho ei mas he problem re and seta | ps simple ne posible | The Circuit lg aos He block digam le reeier, ich. more or les lions te Fome unconentionl “The jnput soma fs pastos shucugh a | tone E amplificanio seg ts ea = e É per ereta arena mea e | pr E “Tae “The put loca owiiatr amd aber Hage of he receiver re sho figo as À EI to for he fed! 2 impai age for low mese, amd a PET 1 de alo ed im te local oito, for cab. Bot o dao aná opspir of à dho. Ec iapat caes ac tunc, wah] nã : À secondary windiag on 2 eods a? má 13, ie he loca asciliatr s ted | ato pib 7. Altaough he E300 à peci, fed for 1) and E2 other (gor 0 ei the porno, Mer usina Goher eps, rever, 1 essential 19] 4 ven Hat be Noca silas al tu are hand (Le. wi CT varied from ida to masi) E e fa 1 oneiiate a ary point (ulen toward remeéy com sometimes. be Tnani hy educ he valas of RS. [za a er, bue te metros detesto cam be Evite Demi te no. Te val Dt Toi the namavband amplifier to lhe spnehrenons detector ta de emite DE TG, de chat fa e iba amplie e lakem fm lhe Joined at pole D, chá he chaageover Ascompláiea in Uh olhneng muuaner DESA so ea ron de Coloror supply to 19 E cut off, lhe dinilar potential o! Tb rever ias e Pasemilir junio of 19, hor blocking the sinal from T9 and los. ing only the sgtal om 16 1o pass it SÍ im e 2 mostiom, ho emiter potential Cf T9 (and honoô of 16) ex Be Su do ap me e base potential of T6, so TG je at Oi sad val the sea from 19 sopeas a be cup. Tas outpu ss e ymclroncs geteclor mus he “can viga to give 3 distomiondies The Synchronous Detector Te principle of simehrenoue detection dus are ee degerBed da to aicie “Modulation System (labor February and April 1995), Basica, for AM Ge. modas, lhe synchramons detector multiplas cogetir de AD agua dad a nal mat tão same toquem and Disse de tho AM cuier (omembedios at he cair tr, Of cout, been. ond converte o te Atend frgueney | O te Jeceive) Ts gli derived eum Im carrier of the AM clgal by | Jocking onto the care fsquoney with o synclvonous demogustor | alho be “ed lo dlect veia ir SS ja, here dh came e noi completely suppresca bu mero | Teducod” to. laiesa Irani É ue Le o lock ont the seonget component wu the signal, mê Je e Ape ico tí TV Tennis, | Th scope of the TV tennis game (Elektor 7) can be considerably extended, In ft basio form the. circuit provides only the tennis. game, with a display consisting simply of bats and ball, with no boundaries or ather refinements, By the addition of a number of auxiliary cireuts, a number of difforant games can ba played, and boundares, automatio scoring and other effects can be added The extension to the TV ten sumo ave connect jato various ponta ch the ii Hosed, some cas addiional Existia os must be broken or con moction of lhe ausiiaey ceu Fig to positivo Lo fine may be ajustea ey arvina he delay vi PIO, Vertical bounderies. do Áhe tase veio of dt IV tona he fed sino paises and occur during e Ga anne intera, he Dal may isppear rom ho eee fr short periods 1 e much more plesine 1 lhe DA am be aee to Teboua from inibe (bio) base To give horizontal súte boundaris at le top am boto of he picture e necetay to produce à peak me video a ls o several le prio, PII adjust lho delay, and ditrforo PIS adjust the duracion of the video one, and Donoo dos” widia of the Ae e Dal must mov rebou from tese ney boundaries, th connections direction in the original circuit, most be Eomenar medica. The new comme box in Tre 6, Instead of functoning chan sao, revening te etc! ol dietion. | ge ge Ee, o epa ssb receiver SSB fsinglosidoband) modulation is used almost. exclusively as the modulation meshod in tha 20, 40 and BO metro ameteur band, and because of this it is possible to construct simple amateur receiver using a singla demodulator (for 858 signals) With tis small compromise it is possible to produce a simple bu. dffective design for the reception OF SSB signals in the above. mentioned band, using only two cells, This receiver has, among its other desirablo properties, asensitivity of 0.5 uV. lo de aslo “Modutation, Systems? Cektos, Febraary ma Apr 1975), the saricus mekods at modulatum us im sgh to points axo socapitulatod heve abrideed Tom Modulation Systems communication spsem bo so ad a place Of st, bas Le la Gr cotrojiog. Infomatios mom one location to amuther, preferia the most efficient mano pose, £ ele Comaimetie rigor de used se tas ronemsion medio tia th Jara iam must De Imprcsed on th electro magoete ester WAVE 4 à change, oi sequence O! changes jm one of te puramelen Of te eartier mave ie the information tus mpdniate 1a caras at the trinados im some wa. At e rece end lhe imodulaed carr le Semodnisted co relevo tha infor A eletiromagmetic ave has to pe mes wie ea be ptiá, amplínuie Jo equeney, and lero are ts tro Categories of modlniom Amplitude Modulaion (AN) and. Frequency Mocuiation O these amplicide modulation has the le oa variant, Tea: x. Dou sidebar ty comer Corea AM b. Double sideband supprssod cair. cDSse da Cie poíiom mosasom (CPR Thero ate only tro 13905 of Sroqueney auodaláio, amei otlatio (EN) am Normal. AM tranemisons as used by and medi Vavo tesuda Sationo dee vstremeiy neficiont mê “ale oE cases power. The] iformanon (bles doc sinplcdy wa ve DON CS at audio epa, e Al 9) red o alter e aepltude E the Cams da socoidanco la He audio signal smpilade, Thus em the penks GÊ the audio signal the caes Amplitude 1 a ii, ole lhe trois the camier amplitude 1s à maximum, or vice versa, The eavelope DE te modulatea Cais te ca lhe “ipi or modultio em be expreoê ae modulaio ind, web e hor Ao do = Unmedulatea cares ampli Amin = minimum modulated carter mpliude | | | | ey o be pre sto erontsçe, Wal 100 à Lhe mod ion údéx. Obricusis, 100% most ati occurs when she caro ampliado seis ts om ho pedi ot te audio “as methos ot modulos vecy officio! for eve regra. 1 ca e O contas he. seio infor pain, nome e contained ia te cur Ferheemor, ever wii LUC mod hnion. SOR or lb trunited crer reides im ne cats, ad 25% ja soc Dr e tdeando. Tn een o 100, módulo “75% “of le” fm nerds wanted (neo only one ate Bands required tu tara a To as itomadom), Wi more, tie A siga oscunis rei o Ban necessary to tran th audl Infor da pente, due to tie vie aynamie ago OE audio agrado and che bi pe o “mca amplie fatio the merage odalátioa index of brgadear tras Tile rrly ext a lew peréni o Dyer 90% ot 2h framamiter enem) Tais as tule cade Why em ix AM o widespread? There e er, ni remos, Tho st 1 char a a ge olbse estao ate, so these 5 Jor E Sopa died up in feanêmisioa and rocepion equipment Nro soy” other moduianioo method use, al onléns AN ecetero end much tranamission equipment would be so ac sp “Tp seco cesso Lica a vão ui — | [E Le l= | eh- | 
