At 9:54 AM -0800 1/22/10, Dan Dugan wrote:
>
>I have a hundred-foot 3.5 mm stereo extension that's .0075 uF from
>one channel to shield. Assuming a 2 Kohm source, it would be a
>gentle low-pass filter at about 10 KHz, if my slide rule technique
>is right.
>
>-Dan Dugan
>
Hi Dan--
Its a pleasure to use a rule isn't it?
Next time I install a long cable run, I'm going to record the test I
did where I connected two Rode NT2000's (7dB[A] self noise)-- one to
a 20' mic and the other to a 1000' role of cable and placed the mics
side by side. Prior to this, I looked at all the charts and did the
HF loss computations and then Richard Lee (miclist) suggested the
obvious perception test. Result: to my aging ears (significant loss
above 9-10Khz), I could not detect any loss of signal or HF. I use
Symetrix SX202 Mic preamps. RFI-wise on my two 700'+ runs, I
sometimes get very faint radio on one mic from a station in Western
Texas when the conditions are just right-- its very,very rare. The
other 3, same model mics get none. I'm running 5 conductor
studio-grade wire ~$180 for 1000'. Rob D.
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