Hi 9.3804 MHz = (2^15*3) * 100 Hz
10 MHz = 2^5 * 5^5 * 100 Hz With a normal integer PLL, your highest lock frequency would be 2^5* 100 Hz = 3200 Hz. Bob On Jun 2, 2013, at 3:52 PM, WB6BNQ <[email protected]> wrote: > Hello Mark and crowd, > > I own one of these and I can guarantee that it CANNOT be moved without > changing the crystal, tweaking a > micro-minature coil value, and changing the firmware. And NO !, the company > would NOT send out the firmware > needed. However, if you wanted to spend between $500 and $1000 they would > fix it for you. > > While there is a DDS inside, it and the crystal are part of Rubidium > frequency locking loop. The actual output > frequency is generated by dividers in a big ASIC/FPGA/whatever device. YES, > that output frequency is derived from > the crystal frequency. > > They start by choosing a output frequency which selects the crystal > frequency. The crystal is multiplied up to some > frequency and mixed with the output of a DDS (also driven by the crystal) to > produce the final frequency multiplied > further to get to the Rubidium resonance. So, without a change in the > firmware, there is no way to tweak the unit > more than a very small amount. > > BUT all is not lost. The 9.8304 MHz frequency is related to the common > RS-232 modem frequencies. It is also > related to the common sound card frequency of 24.576 MHz. There it is > possible to phase lock it to 10 MHz. > > Bill....WB6BNQ > > "Mark C. Stephens" wrote: > >> These are 9.8304Mhz, is possible to move them to 10Mhz? >> >> http://www.ebay.com/itm/Symmetricom-SA-22c-9-8304MHz-Precision-Rubidium-Oscillator-5V-and-15V-NICE-/261223397404 >> >> -marki >> >> Kind Regards, >> Mark Stephens >> >> Mark Clemens Stephens | Customer service engineer | Non-Stop Computer Ltd >> * +61 2 9011 8186 | ( +61 428 256 334 | * >> [email protected]<mailto:[email protected]> >> >> Non-Stop Computer PTY LTD >> 79 Devon St >> North Epping >> NSW 2121 >> Australia >> Timezone: AEST (UTC +10) >> >> Email: [email protected]<mailto:[email protected]> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
