[Ronja] Vacuum tube in Ronja preamplifier
jdb at lartmaker.nl
Mon Oct 15 14:02:17 BST 2007
> >Fibre optic system doesn't have ambient light from the sun with
>>strong noise source.
>Indeed, but if the *sun* dominates, then receiver noise factor is not a big
Sun noise doesn't necessarily dominate, see
ie: daytime sun-induced shot noise is equivalent to ~ -43dBm.
>Then only fix is filtering / optical screening to lower sun optical noise,
>is that not so?
That would be a good plan. I still hope to find the time to
experiment with gel filters such as are used by theater lightning
Point remains that the current front-end is noisier and less
sensitive than necessary; IMHO a change of architecture (active
transimpedance amp versus the resistor that's used now) helps more
that going for a hard-to-get vacuum tube would.
LART. 250 MIPS under one Watt. Free hardware design files.
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