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| To: | "RSGB LF Gp" <[email protected]> |
|---|---|
| Subject: | LF: Re: Sound Card Impedance |
| From: | "Alan Melia" <[email protected]> |
| Date: | Wed, 15 Dec 2010 21:58:32 -0000 |
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Hi Ken stick a steady signal into the card on one channel, (use one of the waterfalls) but put a small, say 20k, pot connected as a variable resistance in series with the source. Wind up the pot' til the signal drops 6dB. Remove the pot and carefully measure the resistance that reduced the level by 6dB and that is the input impedance of the card. Best wishes Alan G3NYK ----- Original Message ----- From: "Ken" <[email protected]> To: <[email protected]> Sent: Wednesday, December 15, 2010 8:09 PM Subject: LF: Sound Card Impedance Hello all. Does anyone know the approximate impedance of the mic input jack on a pc sound card. 73. Ken M0KHW |
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