Mark Sims wrote: > I recently bought a FTS-4060M/S24 cesium beam unit. It is a rather > stripped down model, with 1MHz on the front panel and only > 1/5/10MHz/Fault BNC's on the back (does not even have the monitor port > on the back).
My experience is with a 4050/S24. After some work, mine is pretty much a standard 4050. The /S24 option for the 4050 and 4060 is an indication of a US government model. The /S24 specs are looser than FTS 4050/4060 standard specs, so it is possible that FTS sorted tubes accordingly. I don't know this to be true, but I can say that my 4050/S24 tube is not as good as my 5061b that has a Datum equivalent tube in it. Other than that, at least for the 4050, FTS didn't really do much to "downgrade" the unit -- some connections never make it from the CBT module to the front and back and a few divider board changes were made to provide different outputs. It is easy to add the appropriate plumbing from the CBT module to bulkhead connectors and/or switches to get those capabilities back. I don't recall exactly, but I think it was 1PPS out, 1PPS SYNC in, 10 MHz rear out, and the sync button. The one board I had to "fix" divided the CBT module reference down to 1 MHz for (IIRC) the front panel. It was the standard board, but it had been re-worked to meet government specs. It was fairly easy (aside from the conformal coating) to undo the re-work and return it to its original functionality. -ch _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
