Re: mic check

[Dan Dugan <>]

Mark asked,

>I'm assuming that you didn't have any noticeable HF roll off at 50 feet.
>Any theoretical ideas on the cable length before HF roll off becomes
>noticeable?

Well, if I read my Shure Reactance Slide Rule correctly, with a
source of 2K ohms, a -3dB rolloff at 20KHz would happen with a load
of 4000pF or .004uF.

The miniature coax cable I'm using is probably about 30pF/ft. So the
rolloff calculated above would happen at 133ft. I suspect I'm getting
a measurable but not too significant rolloff at 50ft--probably less
than the attenuation of a windscreen.

-Dan Dugan


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