[time-nuts] FTS 1200
WB6BNQ
wb6bnq at cox.net
Fri Aug 10 00:28:33 UTC 2012
Hi Bert,
My guess would be a bad (shorted maybe?) Varicap. Does it go out of oscillation
if you just ground the efc pin ?
Bill....WB6BNQ
EWKehren at aol.com wrote:
> Bjoern
> No EFC. The moment I even put a small Voltage like 0.9 V through a 33 K
> resistor on pin 2 it quits oscillating.
> Bert
>
>
> In a message dated 8/9/2012 8:07:24 P.M. Eastern Daylight Time,
> bg at lysator.liu.se writes:
>
> Hi Bert,
>
> So the EFC does not work at all? (or did I miss something obvious?)
>
> /Björn
>
> > The unit starts high and over 20 minutes comes down to 4.9999975 with 0 V
> > on the EFC. Any voltage on pin 2 and it quits oscillating.
> > Bert
> >
> >
> > In a message dated 8/9/2012 7:06:48 P.M. Eastern Daylight Time,
> > lists at rtty.us writes:
> >
> > Hi
> >
> > As the unit warms up, you should be able to tell weaner it starts off
> > above 5 or below 5 MHz. There are enough different crystal cuts that
> > *might* be
> > in there that checking it at turn on is the easy approach. If it starts
> > low and is off low, the heater may be the issue.
> >
> > Bob
> >
> > On Aug 9, 2012, at 6:53 PM, EWKehren at aol.com wrote:
> >
> >> Bjoern
> >> No not able to tune it to 5 MHz.
> >> Bert
> >>
> >>
> >> In a message dated 8/9/2012 6:48:59 P.M. Eastern Daylight Time,
> >> bg at lysator.liu.se writes:
> >>
> >> Hi Bert,
> >>
> >>> I have a FTS 1200 that is off by about 2 Hz. Have decided to take
> a
> >>> closer look. Does any one have technical Information I should study
> >>> before I
> >>> open it up.
> >>> Thanks
> >>> Bert Kehren
> >>
> >> The efc range on my FTS 1200 goes from about -1.5Hz to +2Hz (0V to
> > +10V).
> >> Is your FTS1200 of even with max (or min) efc voltage?
> >>
> >> --
> >>
> >> Björn
> >>
> >>
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