[time-nuts] Looking for some Frequency Electronics info....

Bob kb8tq kb8tq at n1k.org
Tue Feb 20 08:18:50 EST 2018


If it works like the unit that replaced it, it has a level detect on the external
input that rejects signals below some threshold. It either locks up to the internal
standard or to the external input. All of the outputs are in the 7 to 13 dim range
when operating. 

The fault circuit looks at the OCXO warmup indicators as well as things like 
PLL out of range to pop the fault light. It should have timers to qualify all of 
this stuff. 

There also *may* be an option to pass the external standard through to the
low frequency output connector ( = no PLL on the low frequency). It depends
a bit on which application it was going into. 


> On Feb 19, 2018, at 11:35 PM, Arthur Dent <golgarfrincham at gmail.com> wrote:
> Some time ago bought one on Ebay for under $50 just because it looked
> interesting. It isn't a prototype but most of the FEI units probably
> had limited production. It seemed to be more complicated than I
> expected it to be but if I understood it better it would make more
> sense.
> The 10Mhz board is enabled/disabled by the int/external switch. The
> 10Mhz output and EFC from this oscillator board are connected to the
> interface board. I believe that these 2 boards and the switch/connector
> on the back allow you to use the internal 10Mhz oscillator to output
> 10Mhz and send 10Mhz on (perhaps a connector marked J4) to a comparator
> board. If I recall this part of the unit should work independant of
> the other boards.
> The comparator board is probably a PLL that compares its 10Mhz input
> with its 100Mhz input and outputs an EFC voltage to the 100Mhz
> oscillator. the 100MHz oscillator output goes to the amplifier board
> with two 100Mhz outputs on the back panel. There is also a 100Mhz
> signal that goes back to the PLL board so the 100Mhz is locked to
> the 10Mhz oscillator or an external input (if I remember correctly).
> There are also other wires that control the light and other stuff
> but I didn't trace them out and my unit seems to work as intended.
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