The newer Trimble Thunderbolt requires +24VDC, but some of the older units on E-Bay, etc. may require +5VDC, +12VDC and -12VDC, which can be obtained from a simple/inexpensive power supply. (I used a Meanwell NET-35B). It outputs a 10MHz sine wave (which plugs into the K3EXREF) as well as 1pps logic signal. Trimble also makes/made an active antenna, which I also found on E-Bay, which is a small square about 2 in/5 cm square and has an internal preamp powered by +5V supplied on the Thunderbolt's antenna jack. I've been running one for about a year now, and it maintains the 10MHz to within about 30 parts per trillion, depending on how many satellites are regularly visible - I usually "see" 8 or 9 in south Florida and 5-6 in the mountains of western North Carolina. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net
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