[PX3] Bandwidth Question

[Ozy]

I'm curious how the PX3 is getting nearly 200Khz of bandwidth from the I/Q out on the KX3.   Using a really high quality sound card,  I barely get 60Khz wide if that and there is significant roll off.   Is there a hidden super secret high BW output magic trickery going on here?

Anxiously awaiting shipment..

Chris
K6OZY
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[Paul Saffren N6HZ]

Hi Ozy,

At 200 KHz span, we're sampling 24 bits at 216 KHz and then using equalization to correct for the roughly 10 dB of roll-off which starts around 50 KHz .

73,

Paul

Ozy wrote

I'm curious how the PX3 is getting nearly 200Khz of bandwidth from the I/Q out on the KX3.   Using a really high quality sound card,  I barely get 60Khz wide if that and there is significant roll off.   Is there a hidden super secret high BW output magic trickery going on here?

Anxiously awaiting shipment..

Chris
K6OZY
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[k6dgw]

On 9/2/2014 3:41 PM, Chris Johnson wrote:
> I'm curious how the PX3 is getting nearly 200Khz of bandwidth from
> the I/Q out on the KX3.   Using a really high quality sound card,  I
> barely get 60Khz wide if that and there is significant roll off.   Is
> there a hidden super secret high BW output magic trickery going on
> here?

Yes.  They fold the rest of the BW up into hyperspace. :-)  Actually, I
don't have a clue.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org

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[tomb18]

Hi Chris, 
You are doing something wrong if you only get 60 kHz.. My experience at least with win4k3suite,  is that 192 kHz is pretty routine with any card that supports it. 
73s Tom 




-------- Original message --------
From: Chris Johnson <[hidden email]>
Date: 02/09/2014  18:41  (GMT-05:00)
To: Elecraft List <[hidden email]>
Subject: [Elecraft] [PX3] Bandwidth Question
 
I'm curious how the PX3 is getting nearly 200Khz of bandwidth from the I/Q out on the KX3.   Using a really high quality sound card,  I barely get 60Khz wide if that and there is significant roll off.   Is there a hidden super secret high BW output magic trickery going on here?

Anxiously awaiting shipment..

Chris
K6OZY
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