Of interest to some folks here, an Ebay seller http://myworld.ebay.com/fluke.l/ has many used/surplus Trimble Thunderbolts GPSDOs for sale. I haven't received any yet, but I heard good reviews about that seller from someone in #hamradio on freenode. (I purchased two, and I recommend that you avail yourself of the 'make an offer' function). Speaking of references, what synthesizers are people using to generate a 64MHz clock for USRP1 from 10MHz reference? I saw some discussion of the TAPR board, but it's no longer available. The jackson labs firefox is drool worthy but totally out of budget, especially since I need two.
on 2008-11-09 05:50