[time-nuts] FTS 1200

EWKehren at aol.com EWKehren at aol.com
Thu Aug 9 20:58:13 EDT 2012


Bill
Grounded pin, works and stays on frequency.
Bert
 
 
In a message dated 8/9/2012 8:29:08 P.M. Eastern Daylight Time,  
wb6bnq at cox.net writes:

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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