[time-nuts] FTS 1200

Bob Camp lists at rtty.us
Thu Aug 9 19:58:28 EDT 2012


Hi

Best bet is a bad solder joint. Likely on the crystal it's self. Of course it could be on anything in series with the crystal.

Bob

On Aug 9, 2012, at 7:49 PM, EWKehren at aol.com wrote:

> 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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