LF: Sound Card mic Impedance

To:	<[email protected]>
Subject:	LF: Sound Card mic Impedance
From:	"Ken" <[email protected]>
Date:	Thu, 16 Dec 2010 20:06:18 -0000
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Thank you all LFs.

Thank you for all the info that you sent me, it looks they can be anything from 4k ohms upwards, this is ok for me, I am doing a Low Pass Filter to use with Winrad, F1, 20kHz, F2, 30 kHz, 100kHz -80 dB (theoretical) with a characteristic impedance of 50 ohms, with this high input impedance I can locate the filter very close to the sound card mic input and terminate the filter output with a 50 ohm resistor. Hopefully this will eliminate the BC intermod I was experiencing when trying to receive Chris G3XIZ the other day.

Ken

M0KHW I091TV

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