> 1. Any reference oscillator operating at 10 MHz would work with the > K3XREF?
The 10 MHz source should have a signal level between +4 dBm and +16 dBm. For square wave sources, 2VDC to 3.3VDC peak is optimum. If the source is a 5V logic level, use a 50-ohm resistor in series with the input. > 2. All that's needed for this to work is the K3XREF, updated firmware, an accurate 10 MHz clock/oscillator, and a BNC cable? Yes. > 3. Trimble Thunderbolt seems to be a good, cheap product to try. Any others that are > $100? Many. For those not affraid of getting a soldering iron hot, I think the Trimble units are pretty tough to beat. Requires making a power cable to a triple-output power supply of your choice. For a while, the HP Z3801A units were very popular. These use noisy DC-DC internal converters, are power hungry, but offer some of the best phase noise peformance of all the GPS-DO units. The Trimble units have been documented to pretty much meet the phase noise performance of the Z3801A. Rubidium is another choice in the USD $100 range but these too will require some creative power connections. > What are the additional advantages of doing this other than knowing you've pretty much eliminated any frequency drift? Really none I can think of, but as the weak-signal V/UHF ops have said, that's reason enough! Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
