Geoff, I have not heard of any hardware from Elecraft yet. In the meantimeI have been thinking on a possible solution to play with:
The K3 is ready for this option as can be seen from the circuid diagram. J4 provides all signals for a PLL module (including 5V supply)while J3 on the back panel picks up an external reference. A syntheiziser built around f.ex ADF 4001( it is also used in the K3 synth) for locking the VCXO Z1 (49.380 MHz) to an external 10MHz is simple in design. For experiment with the ADF4001 it can be programmed via a serial bus connected to your computers parallell port. Analog Devices provides programs and descriptions for this. http://www.analog.com/Analog_Root/static/techSupport/designTools/evaluationBoards/downloadSoftware.html Download Integer-N Software (ADF411X, ADF421X) Evaluation board description: http://www.analog.com/Analog_Root/static/techSupport/designTools/evaluationBoards/downloads/EVAL-ADF4001EB2_D.pdf They also provide free loopfilter simulation software: ADIsimPLL Version 3.1 http://www.analog.com/static/imported-files/data_sheets/ADF4001.pdf One approach after evaluation for a completely built in module is a EEPROM for the PLL programming. At power on the EEPROM programs the PLL Does anybody know the use of the "100Hz" P4 pin #1 ? 73 Jan , SM6TUW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
