On Thu, Jan 26, 2012 at 9:13 AM, Bob Camp <li...@rtty.us> wrote: > Hi > > If you *need* to lock one of the new FE-5680's 10 or 20 Hz high, you > probably can adjust the cap on the VCXO center it's range up there.
The frequency division is done by digital logic inside a CPLD and you'd need to re-program the firmware. I think people have found that these new FE5680s don't lock if you move far from 10MHz and you can't get more than a few hundred Hz from 10Mhz by analog adjustment. The "option 2" that is in the book is different from the fine scale adjustment the current $40 can do. the true option two units can be programmed over a range of many MHz by sending RS232 commands but the current units can only by programmed over rs232 withina very narrow range about like you'd find on a typical OCXO. I think if you want a wide range oscillator you are best using a DDS chip whos clock is locked to the FE5680 or a Thunderbolt. The FE5680's advantage over a t-bolt is portability. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
