{"id":13648,"date":"2022-07-03T12:11:27","date_gmt":"2022-07-03T11:11:27","guid":{"rendered":"http:\/\/www.crowave.com\/blog\/?p=13648"},"modified":"2022-07-03T12:11:27","modified_gmt":"2022-07-03T11:11:27","slug":"am-fm-radio-prijemnik-model-20-1-isis-tristar-tr-4280","status":"publish","type":"post","link":"https:\/\/www.crowave.com\/blog\/2022\/07\/03\/am-fm-radio-prijemnik-model-20-1-isis-tristar-tr-4280\/","title":{"rendered":"AM\/FM radio prijemnik Model 20-1 ISIS (Tristar TR-4280)"},"content":{"rendered":"<p>Danas je dobiven na razmatranje i kozmeti\u010dki popravak (<em>zahvala gospodinu Vuku, ekspertu za cijevna poja\u010dala i kolekcionaru Iskrinih vintage ure\u0111aja<\/em>) mali baterijski AM\/FM radio prijemnik koji se prodavao pod oznakom modela 20-1 ili Tristar TR-4280. Proizvo\u0111a\u010d ovog radija je kineska (Hong Kong) tvrtka naziva &#8220;Isis Electronics Limited&#8221; koja je osnovana 1973. godine i bavi se izvoznom proizvodnjom razli\u010ditih komercijalnih elektroni\u010dkih ure\u0111aja i plasti\u010dnih predmeta \u0161iroke potro\u0161nje. Na\u0161 primjerak je uvezen preko njema\u010dke distributerske tvrtke Kaufhalle GmbH K\u00f6ln. Ovi prijemnici prodavali su se pod oznakama Model 20-1 ISIS, Isis Avon ili Tristar TR-4280, a proizvodili su se vjerojatno tijekom 1980-tih godina. Negdje se mogu na\u0107i podaci da ovaj model prijemnika datira iz 1975. godine, no kasnije \u0107emo vidjeti da upotrijebljeni elementi i op\u0107enito tehnologija izrade vi\u0161e odgovara kasnijem razdoblju. Dizajnirani su za &#8220;Pop Art&#8221; kulturu popularnu u 1980-tim godinama te su bili dostupni u razli\u010ditim bojama i grafikama.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_01.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13649\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_01.jpg\" alt=\"\" width=\"1000\" height=\"346\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_01.jpg 1000w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_01-768x266.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_02.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13650\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_02.jpg\" alt=\"\" width=\"1300\" height=\"484\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_02.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_02-768x286.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_03.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13651\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_03.jpg\" alt=\"\" width=\"1000\" height=\"380\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_03.jpg 1000w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_03-768x292.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_05.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13653\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_05.jpg\" alt=\"\" width=\"500\" height=\"305\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Na\u0161 primjerak je u svjetlo zelenoj boji i vidljiva su dva tipi\u010dna o\u0161te\u0107enja ku\u0107i\u0161ta. Jedno se odnosi na prostor za baterije gdje nedostaje poklopac i zamijenjen je originalni dr\u017ea\u010d za \u010detiri AA baterije koji ne sjeda ba\u0161 najbolje u predvi\u0111eni prostor. Drugo o\u0161te\u0107enje se odnosi na teleskopsku izvla\u010divu antenu koja je zamijenjena komadom \u017eice. Tako\u0111er se uo\u010dava potrgani dr\u017ea\u010d kraja antene u sklopljenom stanju, potrgani rubni dio ku\u0107i\u0161ta oko potenciometra za glasno\u0107u te neka manja termi\u010dka o\u0161te\u0107enja na ku\u0107i\u0161tu. Sve ovo su vrlo tipi\u010dna o\u0161te\u0107enja kod baterijskih prijemnika u plasti\u010dnim ku\u0107i\u0161tima. Oko baterija, antene i kontrola se stalno manipulira te na tim mjestima o\u010dekivano i najprije dolazi do mehani\u010dkih o\u0161te\u0107enja.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_06.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13654\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_06.jpg\" alt=\"\" width=\"1300\" height=\"724\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_06.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_06-768x428.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_06-450x250.jpg 450w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_07.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13655\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_07.jpg\" alt=\"\" width=\"1300\" height=\"1152\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_07.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_07-768x681.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_10.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13658\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_10.jpg\" alt=\"\" width=\"1300\" height=\"619\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_10.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_10-768x366.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_11.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13659\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_11.jpg\" alt=\"\" width=\"1300\" height=\"420\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_11.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_11-768x248.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_08.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13656\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_08.jpg\" alt=\"\" width=\"1300\" height=\"667\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_08.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_08-768x394.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_09.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13657\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_09.jpg\" alt=\"\" width=\"600\" height=\"346\" \/><\/a><span style=\"color: #00ffff;\"><em>Oznaku modela kod ovog na\u0161eg prijemnika nalazimo jedino na tiskanoj plo\u010dici.\u00a0<\/em><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>Prijemnik Model 20-1 bazira se na deset tranzistora. Na na\u0161oj blok shemi nacrtali smo kako su isti raspore\u0111eni. Vidimo da u na\u0161em slu\u010daju AM tuner ima vlastiti tranzistor, no ponekad se isti tranzistor u AM modu koristi za samoosciliraju\u0107i mje\u0161a\u010d, a u FM modu za 1. MF poja\u010dalo. Time se u\u0161tedi jedan tranzistor ili se isti prebaci u NF poja\u010dalo.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_22.gif\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13670\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_22.gif\" alt=\"\" width=\"1453\" height=\"519\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_22.gif 1453w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_22-768x274.gif 768w\" sizes=\"auto, (max-width: 1453px) 100vw, 1453px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Upotrijebljeni su kineski tranzistori op\u0107e namjene:<\/p>\n<ul>\n<li>S9018 &#8211; NPN tranzistor za UHF frekvencije, ugra\u0111eni u FM tuner<\/li>\n<li>S 9011, S 9013 &#8211; NPN tranzistori op\u0107e namjene za ni\u017ee frekvencije<\/li>\n<li>S 9012 &#8211; PNP tranzistor komplementaran sa S9013 za izlazni protufazni (push-pull) NF audio stupanj<\/li>\n<\/ul>\n<p>Nemamo \u0161to specijalno napisati za ovaj prijemnik. Rije\u010d je o klasi\u010dnom superheterodinu sa tri stupnja MF poja\u010danja u FM modu i dva stupnja MF poja\u010danja u AM modu, kako je i bio standard za ogroman broj sli\u010dnih radio prijemnika iz tog razdoblja. Nisu ugra\u0111eni nikakvi kerami\u010dki filtri, odnosno selekcija se posti\u017ee samo MF poja\u010dalima sa transformatorima. AM diodni detektor i FM ratio-detektor tako\u0111er su izvedeni na najjednostavniji (najjeftiniji) mogu\u0107i na\u010din. S obzirom na tipske tranzistore u plasti\u010dnim TO-92 ku\u0107i\u0161tima i s obzirom da je NF poja\u010dalo izvedeno bez transformatora, ovaj prijemnik bi prije svrstali na po\u010detak 1980-tih, nego sredinu 1970-tih godina.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_12.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13660\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_12.jpg\" alt=\"\" width=\"1300\" height=\"443\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_12.jpg 1300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_12-768x262.jpg 768w\" sizes=\"auto, (max-width: 1300px) 100vw, 1300px\" \/><\/a><em><span style=\"color: #00ffff;\">Prvo \u0161to potra\u017eimo na tiskanoj plo\u010dici svakog tranzistorskog prijemnika to su karakteristi\u010dne dvije diode pored transformatora FM ratio-detektora i jedna AM detektorska dioda pored posljednjeg u lancu (crnog) AM MF transformatora. Nakon toga se pobroje i identificiraju MF transformatori. Ovime ve\u0107 puno saznamo o konstrukciji prijemnika. Desno na slici je detalj vrlo jednostavnog (direktnog) mehanizma bira\u010da postaja sa skalom.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_04.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13652\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_04.jpg\" alt=\"\" width=\"500\" height=\"337\" \/><\/a> \u00a0<em><span style=\"color: #00ffff;\"> Skala bira\u010da postaja je toliko minijaturna, skrivena i prekrivena da prakti\u010dno nema nikakvu funkciju.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>Prijemnik je sam po sebi ispravan, no imamo zadatak ugraditi nedostaju\u0107u antenu i ku\u0107i\u0161te za baterije \u0161to sli\u010dnije originalu.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_21.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13669\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_21.jpg\" alt=\"\" width=\"500\" height=\"358\" \/><\/a><em><span style=\"color: #00ffff;\">Ovako bi trebala originalno izgledati monta\u017ea FM antene i ku\u0107i\u0161te za smje\u0161taj \u010detiri AA baterije.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p>Antena bi trebala biti du\u017eine oko 15 cm, promjera oko 5 mm i sa pet razina izvla\u010denja. Na slici se jasno vidi da mora zavr\u0161avati &#8220;vilju\u0161kom&#8221;. Ku\u0107i\u0161te za baterije je od tanke plastike i vrlo reducirano, vidimo da nosivi element prolazi samo izme\u0111u baterija \u010dime se \u017eeljela posti\u0107i minimalna \u0161irina ukupnog paketa kako bi se mogao ugurati u uski prostor &#8220;slova R&#8221;.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_13.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13661\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_13.jpg\" alt=\"\" width=\"800\" height=\"301\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_13.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_13-768x289.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Krenimo od antene. U \u010ditavom na\u0161em arsenalu prikupljenih radio antena ni jedna u potpunosti ne odgovara ovom prijemniku. Morati \u0107emo smisliti neko konstruktivno rje\u0161enje.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_14.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13662\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_14.jpg\" alt=\"\" width=\"800\" height=\"106\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_14.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_14-768x102.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Prona\u0161li smo dvije antene kao najbolje kandidate za na\u0161 prijemnik. Gornja odgovara du\u017einom, no za milimetar je predebela i zavr\u0161ava u\u0161icom. Donja odgovara debljinom i zavr\u0161ava vilju\u0161kom, no malo je preduga\u010dka.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_15.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13663\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_15.jpg\" alt=\"\" width=\"800\" height=\"390\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_15.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_15-768x374.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Na dijelu predvi\u0111enom za monta\u017eu antene uo\u010davaju se tragovi prethodnih poku\u0161aja popravka. Sam nosivi dio plastike prili\u010dno je o\u0161te\u0107en. Nedostaje nam i nosivi metalni dio sa u\u0161icom, nigdje nismo prona\u0161li ne\u0161to odgovaraju\u0107e. <\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_16.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13664\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_16.jpg\" alt=\"\" width=\"800\" height=\"332\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_16.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_16-768x319.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Gornji dio plastike je ionako previ\u0161e o\u0161te\u0107en pa smo ga uklonili. Time smo stvorili uvjete za monta\u017eu nosa\u010da kakvih imamo na lageru. Ugraditi \u0107emo antenu koja zavr\u0161ava u\u0161icom jer dimenzijama bolje odgovara originalu.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_17.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13665\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_17.jpg\" alt=\"\" width=\"800\" height=\"381\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_17.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_17-768x366.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Zbog vrlo uskog otvora u plastici monta\u017eni zavr\u0161etak nosa\u010da antene bilo je potrebno maksimalno stanjiti.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_18.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13666\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_18.jpg\" alt=\"\" width=\"800\" height=\"282\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_18.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_18-768x271.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Ovo je najbolje \u0161to smo mogli napraviti sa dostupnim materijalom. Postoje naravno dodatne mogu\u0107nosti u\u010dvr\u0161\u0107enja podno\u017eja antene na vi\u0161oj to\u010dki nekim obujmicama, vezicama i sli\u010dno, no za to treba dodatno bu\u0161iti (uni\u0161tavati) ku\u0107i\u0161te. Antena je za sada dovoljno \u010dvrsta i na ovom jednom vijku.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_19.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13667\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_19.jpg\" alt=\"\" width=\"800\" height=\"555\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_19.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_19-768x533.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"color: #00ffff;\">Sa druge strane osigurali smo dobar elektri\u010dni kontakt sa antenom.\u00a0 \u00a0 <\/span><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_20.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13668\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_20.jpg\" alt=\"\" width=\"800\" height=\"346\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_20.jpg 800w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_20-768x332.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>Zamjenski dr\u017ea\u010d za baterije koji vidimo na slici najsli\u010dniji je onom originalnom. Potrebno je bilo stanjiti rubove dr\u017ea\u010da kako bi u\u0161ao u uski otvor unutra\u0161njosti ku\u0107i\u0161ta. Tako\u0111er su \u017eice preba\u010dene s bo\u010dne na zadnju stranu dr\u017ea\u010da kako bi isti mogao sjesti u ku\u0107i\u0161te sa kra\u0107e strane tako da ne viri izvan ku\u0107i\u0161ta. Kad se stave baterije, paket tijesno ulazi u ku\u0107i\u0161te, no ipak ulazi. Zapravo bi morali rezati dijelove zadnje strane gdje baterije dodiruju ku\u0107i\u0161te (kako je to napravljeno i na originalnom nosa\u010du) ali to doista nema smisla jer se baterije ionako vjerojatno i ne\u0107e koristiti. Prijemnik ima sa zadnje strane uti\u010dnicu za vanjsko napajanje DC 6 V.<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p>Kod prijemnika Model 20-1 ISIS naglasak je bio na &#8220;Pop Art&#8221; dizajnu vanjskog ku\u0107i\u0161ta, a kvaliteta prijemnika i prakti\u010dnost rukovanja stavljeni su u drugi plan. Dovoljno se samo osvrnuti na minijaturnu skalu prijemnika koja ovdje gotovo da i nemaju neku funkciju, a direktni pogon bira\u010da postaja (bez redukcije prijenosa) svakako ne osigurava lako i fino pode\u0161avanje na \u017eeljenu frekvenciju. No, ovo je ipak dizajnerski radio, a kod takvog ure\u0111aja je funkcionalnost uvijek u drugom planu.<\/p>\n<p>U uputama za rukovanje radio prijemnikom trebalo bi stajati upozorenje da antena na radiju ne slu\u017ei kao ru\u010dka za no\u0161enje istog ili kao \u0161tap za \u010de\u0161kanje le\u0111a, vje\u0161anje ukrasa, dohva\u0107anje predmeta koji su pali iza ormara ili kreveta, za zabavu razvla\u010denja i uvla\u010denja, podbadanja i sli\u010dne poslove. Ok, prijemnik Model 20-1 ISIS je doista lagan i duga\u010dka razvu\u010dena antena svakako prijeti njegovom nenamjernom prevrtanju ili padu, no FM tuner je jednostavan i bez dobre, dovoljno duge antene ne\u0107e dobro hvatati postaje.<\/p>\n<p>\u0160to se ti\u010de baterijskih ku\u0107i\u0161ta, nosa\u010da i dr\u017ea\u010da, gotovo je nemogu\u0107e na\u0107i rabljeni stari ure\u0111aj bez o\u0161te\u0107enja na tom dijelu. Najve\u0107u \u0161tetu svakako nanose zaboravljene baterije iz kojih s vremenom iscuri agresivan elektrolit, no \u010desto je praksa, kad su baterije ve\u0107 pri kraju, da se okretanjem, zagrijavanjem, udaranjem i sli\u010dnim mehani\u010dkim utjecajima na baterije u ku\u0107i\u0161tu po\u0161to-poto poku\u0161ava iz njih izvu\u0107i jo\u0161 ne\u0161to snage, bez obzira \u0161to je ista ve\u0107 nepovratno potro\u0161ena. Tako\u0111er, kad prijem oslabi, svaki dobri korisnik radio ure\u0111aja obavezno \u0107e prvo pomisliti na lo\u0161 kontakt pa slijedi navla\u010denje, stiskanje, lupanje i sli\u010dne metode rje\u0161avanja problema koje se uvijek \u010dine jeftinije od kupnje novih baterija.<\/p>\n<p>Najgore \u0161to mo\u017ee zadesiti jednog elektroni\u010dara to je kad dobije na popravak elektroni\u010dki ure\u0111aj sa isklju\u010divo mehani\u010dkim o\u0161te\u0107enjima. Svaki tip ure\u0111aja ima sebi svojstven dizajn ku\u0107i\u0161ta i prema tome jedinstvene i sve dijelove istog. Kad se ne\u0161to polomi ili izgubi nema univerzalnog rje\u0161enja za taj problem. Jo\u0161 kad je uz to taj ure\u0111aj i dizajnerski, zahtjevi dodatno porastu. No, iz starog se ne mo\u017ee napraviti novo, niti se iz uni\u0161tenog mo\u017ee ponovno stvoriti original. Dobro, mo\u017eda se i mo\u017ee, ali to onda svakako nije posao za elektroni\u010dara \ud83d\ude42 Kako god bilo, ovaj primjerak retro radio ure\u0111aja sada mo\u017eda izgleda i mrvicu bolje nego prije (ipak ima antenu), potro\u0161ili nismo ni\u0161ta drugo osim vremena, a samim time je onda i smisao cijele ove pri\u010de ispunjen \ud83d\ude42<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_23.jpg\" rel=\"lightbox[13648]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13675\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_23.jpg\" alt=\"\" width=\"400\" height=\"590\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><em>PS: Gospodin Vuk s po\u010detka pri\u010de nije kriv za ovakvo stanje opisanog dizajnerskog prijemnika. On ga je jednostavno prona\u0161ao u takvom stanju i sa\u017ealio se nad njegovom sudbinom \ud83d\ude42<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Danas je dobiven na razmatranje i kozmeti\u010dki popravak (zahvala gospodinu Vuku, ekspertu za cijevna poja\u010dala i kolekcionaru Iskrinih vintage ure\u0111aja) mali baterijski AM\/FM radio prijemnik koji se prodavao pod oznakom modela 20-1 ili Tristar TR-4280. Proizvo\u0111a\u010d ovog radija je kineska (Hong Kong) tvrtka naziva &#8220;Isis Electronics Limited&#8221; koja je osnovana 1973. godine i bavi se [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":13649,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":{"0":"post-13648","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-radio","8":"czr-hentry"},"jetpack_featured_media_url":"https:\/\/crowave.com\/blog\/wp-content\/uploads\/2022\/07\/isis_20_tristar_tr4280_01.jpg","_links":{"self":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/13648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/comments?post=13648"}],"version-history":[{"count":5,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/13648\/revisions"}],"predecessor-version":[{"id":13676,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/13648\/revisions\/13676"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media\/13649"}],"wp:attachment":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media?parent=13648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/categories?post=13648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/tags?post=13648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}