[time-nuts] Fury Interface Board: How about TI OPA277?

[SAIDJACK at aol.com]

In a message dated 11/3/2007 02:19:49 Pacific Daylight Time,  
bruce.griffiths at xtra.co.nz writes:

>Said

>Another consideration is that for 10544A's and  similar oscillators which
>are only intended to drive high impedance  loads( >= 1K) a simple 2
>transistor cascode buffer (or maybe a  10811A style common emitter stage
>with series feedback in the emitter  circuit) may be required to allow
>them to drive a 50 ohm load or an RF  transformer satisfactorily.  A
>cascode buffer has higher isolation  than a common emitter stage.

>Bruce


Hi Bruce,
 
that's a good point. The Fury can be turned into a high-impedance 10MHz  
input by removing resistor R38.
 
This makes Fury also compatible with HCMOS OCXO's.
 
But removing this requires soldering, which unfortunately would void the  
warranty..
 
bye,
Said



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