[time-nuts] Question about FTS 1050A

[paul swed]

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 <actast at hotmail.com> 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: bobdarby at triad.rr.com
> > To: time-nuts at 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
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