On Wed, December 27, 2006 11:30, Rex said: > On Tue, 26 Dec 2006 22:06:28 -0600, "Bill Hawkins" <[EMAIL PROTECTED]> > wrote: > >>What's all this about 15 MHz out? >> >>Bill Hawkins > > I have an FRS-C rubidium (10 MHz) that I bought a couple years ago. It > came in a metal box that also contained a circuit board that provided 3 > TNC output connectors. Two of those had 10 MHz square wave output. One > provided a strong (24.3 dBm into 50 ohms) 15 MHz sine wave output. > > The board somehow used the 10 MHz from the rubidium to generate a 15 MHz > sine. I never figured out exactly how they were doing this; the board > had an an Altera EP610PC-25T PLD doing most of the interesting stuff. I > now suspect my box must have been for a similar setup to the Lucent > application. > > In the FRS box I noticed a 15 MHz filter on the board. If you look at > John's picture rftg-m-xo-7.jpg, the metal can in the top-center (not the > Efratom oscillator) is a 15 MHz filter.
Also got one of those FRS-C boxes. Note that the FRS-C is the TTL-output version. That is usually not adverticed by the ebay sellers. -- Björn _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts