Hi Bob; I was wondering who won the unit. They are very nice oscillators. With noise on older equipment like the 1050A I would check and/or replace caps. I am about to do that to my own 1050A. It may not resolve the problem, but it will eliminate that possibility. I look forward to hearing how the problem is resolved. Best Wishes; Thomas Knox
> Date: Wed, 3 Apr 2013 14:53:55 -0400 > From: bobda...@triad.rr.com > To: time-nuts@febo.com > Subject: [time-nuts] Question about FTS 1050A > > I purchased an FTS 1050 recently and after a cursory inspection of the > interior powered it up to see if it's functional. > > This particular unit is a bit odd; it has the optional battery back-up, > no PPS, and instead of the usual 1Mhz, 5Mhz, 10Mhz it has four 10Mhz > outputs with tnc female connectors. > > The tnc connectors are a bit of a bother but I found that the scope > probe sleeve that fits a bnc also fits into a tnc so I'm able to view > the outputs. They are not pretty, lots of hash, particularly at the > zero crossings and only about 15 to 20mV rms. That's the case for all four. > > The oscillator is an FTS 1000B-503 which is supposed to have four > buffered outputs at 5MHz; two at 1.0 V rms and two at 0.5 V rms. Two > outputs each drive a pair of frequency doublers that thus provide the > four 10Mhz outputs. I got a connector on one of the spare outputs to > see if the problem might lie in the oscillator. What I see there is a > very stable clean sine wave at 5MHz at about 660mV rms so I'm assuming > the 1000B is not my problem. > > The doublers are housed in a tidy box adjacent to the oscillator with > 22V and ground, two 5MHz inputs and four 10MHz outputs all in the top > cover. There is a stone cold 7818 in a TO-3 metal can mounted on one > side of the box but no external connections other than those previously > noted. It seems to me my problem must lie in this area and, since all > four circuits are similarly affected, is probably related to the power > supply housed therein. > > This is probably obvious to all of you but I'm a toolmaker by trade so > this is all new to me and second opinions will not hurt my feelings. > Also does anyone have any experience inside of the doubler box or a > schematic of the standard (or any other version) doubler/divider for > these things? > > Thanks for any insight anyone can offer. > > Bob Darby > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.