Yes, the 2712 is different from the 492 series. But it still has a 1st if via a YIG but now at a slightly higher 2110MHz, 100MHz master and the same 110 2nd if etc. It is a completely new physical design, newer CPU, maybe about 2-3 times faster (my estimate) than the 68xx in the 492. But, the general RF design is similary, phase gate, inner, outer loop control, analog log amps, 2 frequency markers and all that.
The relay atten is a much less expensive design than the uwave cavity in the 492's which works up to10 times the frequency using thin film wafers. (The 492 attens are not repairable but can be found on paybay).
As a side note, the 275x 279x series parts are way way more expensive than 492 parts (ignoring the 40GHz model) I wonder what 2712 parts costs are like?
