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LF: AW: RE: Static protection when using a soundcard as an Rx

To: <[email protected]>
Subject: LF: AW: RE: Static protection when using a soundcard as an Rx
From: Stefan Schäfer <[email protected]>
Date: Mon, 14 Jun 2010 00:54:26 +0200
References: <[email protected]> <[email protected]>
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Thread-index: AcsLFwsvNbvxd6xHQq2bN+XXQhQ76QADFRbgAAm6r1c=
Thread-topic: RE: Static protection when using a soundcard as an Rx
Hi Brian and also welcome :-)
 
I would combinate back to back diodes with a isolating transformer for audio. A 
combination of the hints you heared before ;-) The transformer prevents 
galvanic coupling (could become a problem even if your wire is grounded for 
high voltages by the diodes) and the diodes on the soundcard side are an 
additional safety factor that reduces voltage spikes. But the diodes start to 
conduct already at some 1/10 volts (depending on the temperature) so you may 
use 2 in series each...
 
73 es gl becoming QRV!!
 
Stefan/DK7FC

________________________________

Von: [email protected] im Auftrag von James Cowburn
Gesendet: So 13.06.2010 20:09
An: [email protected]
Betreff: LF: RE: Static protection when using a soundcard as an Rx



Hi Brian

 

Welcome to the reflector.   Back to back diodes are good option to limit surges 
and spikes, but others are more qualified than me to advise

 

 

 

 

With best regards

 

 

Jim

 

 

Dr. James Cowburn  G7NKS

E [email protected]

 

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________________________________

From: [email protected] 
[mailto:[email protected]] On Behalf Of Brian Reay
Sent: 13 June 2010 17:38
To: [email protected]
Subject: LF: Static protection when using a soundcard as an Rx

 

Hi All, 

 

My first post to the reflector.

 

I plan to try using a sound card and a "long wire" (well as long as I can fit 
into the garden) antenna and later a kit lofted antenna but I'm concerned re 
static. 

 

 

Normally I'd add a "dc short" with an inductor but at 10kHz than is a big 
inductor. A resistor is another options.

 

Does anyone have any other suggestions, please.

 

73

Brian

 

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