Bob I have no schematics but some pics might be helpful in trying to understand why the 7818 has not incoming voltage. I speculate the unit plus into 110 VAC? The TNCs almost make sound like some cel tower thing. Regards] Paul WB8TSL
On Wed, Apr 3, 2013 at 3:07 PM, Tom Knox <[email protected]> wrote: > 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: [email protected] > > To: [email protected] > > 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 -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > 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. > _______________________________________________ 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.
