[time-nuts] Thunderbolt Harmonics
jimlux at earthlink.net
Thu Jan 19 08:06:24 EST 2017
On 1/18/17 8:04 PM, Gerhard Hoffmann wrote:
> Am 18.01.2017 um 22:12 schrieb Bob Camp:
>>> Yeah, but it's easier (cheaper if you're paying for labor) just to
>>> buy a box of 10 filters at $30/each and stack them
>> Be *very* careful cascading those Min-Circuits filters without putting
>> some sort of isolation between them. You can get all
>> sorts of wonky results as the reactances in one mis-terminates the
>> reactances in another.
> But you can be quite lucky:
> 1 SLP15+ filter (15 MHz Low pass):
> 3 filters cascaded
And the SLP10.7+ is very similar, except the 3dB down is around 13.5
MHz, and it's down 33 dB at 20 MHz.
As a practical matter, a chain of two SLP10.7 knocks the harmonics from
a Wenzel streamline down below the broadband noise floor when measured
with a system with 4 dB NF.
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