Or the 10.245 MHZ and 11.155 MHz crystals used for converting 10.7 MHZ first IF to 455 KHZ second IF.
144.56 MHZ was used in Europe as a simplex channel on 2 meters, as the 11.155 MHZ crystal was widely available. (11.155 * 12) + 10.7 = 144.560 -- Flemming Larsen --- Javier <[EMAIL PROTECTED]> wrote: > Narrowband FM used in land mobile radio and amateur > radio usually has > 25, 20 or 12.5 KHz channel spacing. 10.24MHz was > mostly used in CB > radios with a MC145106 or similar PLL IC, and with a > double purpose: to > obtain a 5KHz PLL reference and also as the 2nd > local oscillator to > convert 10.7MHz first IF to 460KHz second IF. > > This reminds me another widely used crystal > frequency for the list: > 12.8MHz is used in radio transceivers with 25 and > 12.5KHz channel > spacing, since 12.5KHz PLL reference is 12.8MHz / > 1024 (and also another > discrepances: 60.005 would be 60KHz with a 5Hz IF, > no 5KHz, and also > 77.503 would be 77.5KHz with 3Hz IF, no 3KHz). > > Regards, > > Javier, EA1CRB > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
