[time-nuts] Modified Extron DA [WAS: Rb video]

Robert LaJeunesse rlajeunesse at sbcglobal.net
Fri Aug 9 17:24:14 EDT 2013


Bob, I need some education. For a low-pass filter I think series L and shunt C. For two inductors that normally means 2-3 capacitors.  If you use only one shunt capacitor is the second L in series with it (as a harmonic trap)? Can you point me to a design tool (or equation set) somewhere that shows how to choose values best to match the impedances? 

thanks,

Bob LaJeunesse



>________________________________
> From: Bob Camp <lists at rtty.us>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Friday, August 9, 2013 4:57 PM
>Subject: Re: [time-nuts] Modified Extron DA [WAS: Rb video]
> 
>
>I still think that a distribution amp based on logic ic's is cheaper / simpler / lower power / higher performance. A pair of NC7SZ125's will dump 20 dbm into 50 ohms all day long running at 5.5 volts. Good isolation as well. Do the lowpass filter right and the harmonics are not an issue. Two coils / one cap plus dc blocking does it quite nicely. 
>


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