[time-nuts] filtering a 10Mhz frequency standard?

John Ackermann N8UR jra at febo.com
Tue Dec 13 09:41:34 EST 2011


Not to take anything away from Paul's design, but if you have to buy the 
box new, for three bucks more you can get a complete 10.7 MHz LPF with 
BNC connectors from MiniCircuits (Model BLP-10.7+, $32.95).  They also 
have quite a few other useful cutoff frequencies -- 1.9 MHz, 5 MHz, 30 
MHz, etc.

John
----

On 12/13/2011 9:08 AM, Robert Darlington wrote:
> I just ordered the parts for this filter from Mouser Electronics.   ~ $30
> plus shipping including a shiny new Pomona box.
>
> qty 2 542-78F1R0-RC RF Inductors 1.0uH 10% @ $0.18 ea
> qty 2 140-50S5-271J-RC Ceramic Disc Capacitors 50V 270pF SL 5% Tol @ $0.14
> ea
> qty 1 140-50S5-471J-RC Ceramic Disc Capacitors 50V 470pF SL 5% Tol @ $0.11
> ea
> qty 1 565-3752 Test Connectors SHLD BOX BNC (M/F) @ $29.12 ea (ouch!)
>
> That's 75 cents in parts plus the box.  Once assembled I'll sweep it with
> the network analyzer and report back on tweaks made to get it closer to the
> simulation.
>
> -Bob





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