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Kapitola 11. Stavba VFO pro vyšší pásma - 599.cz

@Frank W. Harris 2004 crystal sets to sideband Strana 1 (celkem 10) Pre-Mix oscil tor = PMO Na obr zku naho e je uk zka QRP CW bloku pro p smo 30m. Velmi p ipom n krystalem zen QRP modul popisovan v V modulu je pou it krystalem zen premix oscil tor (PMO) ke konverzi n zk ho kmito tu VFO nahoru na po adovan amat rsk p smo. Vstupem pro tento konkr tn modul je sign l z VFO pro 80m a v stupn sign l pokr v 30m p smo 10,100-10,150 Mhz. Vstupn VFO sign l a stejnosm rn nap jen jsou p ipojeny vzadu. V stupn sign l 5W vych z na erven m cinch konektoru na lev stran hlin kov ho chladi e. Vstup pro telegrafn kl (ozna en mod e) je vpravo. eby ev v v stupn filtr je viditeln v pop ed . Zesilovac filtry pro PMO jsou v zadn sti. Bylo by to mnohem profesion ln j kdyby bylo v e uzav eno v kovov st n c krabi ce, ale j m m r d, kdy vid m na v echny sou stky. P i stavb QRP CW si nemus te se st n n m d lat starosti. Ale pozd ji uvid te, e st n n je nezbytnost p i stavb SSB.

Crystal sets to sideband Strana 5 (celkem 10) 10ti metrů. Potom ovšem přepnutí na jiné pásmo znamená přepnout krystalový oscilátor a přeladit celý řetězec na nové pásmo. To by nebylo příliš pohodlné přepínání pásem.

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