[time-nuts] homebrew 13 dBm distribution amplifier based on NIST design 5 to 100 MHz

Poul-Henning Kamp phk at phk.freebsd.dk
Thu Sep 25 16:34:37 EDT 2008


In message <qlcld41iisd7o6jq43o4tpbi3bgievgr6h at 4ax.com>, Gerhard Hoffmann write
s:

>The question is more if the 100r * 100u do anything to de-noise
>the LED voltage. Close to the carrier probably not. The problem is
>that you nowhere get exact numbers to base a decision on.

Be aware that LED's work both ways: current->light and light->current.

Their noise spectrum is influenced by the ambient light, in particular
flourecent lights, other discharge types, and, ironically, modulated
LED lamps.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



More information about the time-nuts mailing list