Thanks for the schematics. Yes, I have a font end feeding into a dual LF mixer but was thinking of moving up in frequency with the mixer itself. I have been using a couple of SBL-1s which should be fine way up in frequency even when the FST may start to flag a bit. The simplest single chanel synthesiser I can think of would be one based on the Motorola MC13175 transmitter chip with its internal divide-by-8 ratio which could provide high enough frequencies to feed the 74HC74. Perhaps I'm making things more complicated than they need to be. I'll have another play with "paper" circuits. Thanks Ian
KD5NWA wrote: > You may want to take a look at the SoftRock V6 schematic, by using a > purely digital clock generation circuitry, it's free to move around > in frequency without changing any components on the Quadrature clock > generator. All you would change is the input band-filter. Now if you > have an old pre-selector unit, they usually have 100KHz to 30Mhz in > six bands and use that as your front end filter and DDS for the > source of your clock, you can move around all over creation without > changing any components on the hardware. > > The schematics to the V6 is available at the link below. > > < http://www.qrpradio.com/pub/Ham/SDR/SoftRocks/ > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
