hat
Aliyman nan sa a sikwi se pa difisil. Premye ou mete tout gazon nan seri mitan ak pwogram frekans lan. Pou travay sa a, ou tou senpleman ajoute pwa yo switch: pi piti Switch la enpòtan pwodui 100kHz, dezyèm nan ajoute 200kHz, 400kHz kap vini an, ak sou sa, jouk wityèm lan, ki ajoute 12.8 megaèrts. nevyèm a aktyèlman konekte nan de entrain nan chip nan PLL, se konsa li ajoute 76.8 megaèrts, ak chanjman an dizyèm ajoute 102.4MHz. Pou kalkile anviwònman switch pou yon frekans bay yo, ou tou senpleman dekonpoze l 'nan eleman binè li yo, li mete switch yo apwopriye. Remake byen ke yon switch ki se sou se pa ajoute kontribisyon frekans li yo! Pou egzanp, si ou vle transmèt sou 96.5 megaèrts, ou ta mete switch 9, 8, 7, 3, ak 1 OFF, lòt moun yo nan ON. seri a plen nan frekans ou ka mete nan synthesizer a kouvri tout gwoup la FM emisyon ak afè yon ti jan pi plis, men li te rès la nan kous la ki fèt sèlman pou gwoup la difizyon.
eng
Alignment of this circuit is not difficult. First you set all trimmers to mid range and program the frequency. For this task, you simply add the switch weights: The least significant switch produces 100kHz, the second adds 200kHz, the next 400kHz, and so on, until the eighth, which adds 12.8 MHz. The ninth actually connects to two inputs of the PLL chip, so it adds 76.8 MHz, with the tenth switch adding 102.4MHz. To calculate switch settings for a given frequency, you simply decompose it into its binary components, and set the proper switches. Note that a switch that is ON is NOT adding its frequency contribution! For example, if you want to transmit on 96.5 MHz, you would set switches 9, 8, 7, 3, and 1 to OFF, the others to ON. The full range of frequencies you can set in the synthesizer covers the entire FM broadcast band and quite a bit more, but the rest of the circuit was designed only for the broadcast band.