[Elecraft] RX IQ sound card problems KX3

[W9TTW Tabb Adams]

Thanks for the update I have ordered a nice isolator from Cables To Go should have it soon I will let you know how it works out!

W9TTW 73

From: Peter Eijlander (PA0PJE) [via Elecraft] 
Sent: Thursday, January 17, 2013 3:38 PM
To: W9TTW Tabb Adams 
Subject: Re: RX IQ sound card problems KX3

Tabb, 

I now have received my KX3 and it's working ok. Took me just part of an 
evening to assemble it. Of course I did try the HDSDR software and 
indeed I have the same hum, which is due to ground loops. I also 
experienced the total lack of image suppression but that turned out to 
be a bad contact in the 3.5 mm jack plug at the female end of the 
adapter cable for 3.5 > 2.5 mm. Thoroughly cleaning the plug solved the 
problem. Next step will be the isolation. The Softrock mixer has an 
isolated BNC connector at it's input, therefore did not show this hum 
problem. 

73, 
Peter - PA0PJE 

Don Wilhelm schreef: 

> Tabb. 
> 
> You are seeing images.  That is a result of either imbalance in your 
> soundcard gain settings for the I and Q settings or a failure ot the 
> application to adjust for those images.  If you are using NaP3 as your 
> application, there are steps you can take to detect and cancel the 
> images - tune to a strong signal and the cancellation process is automatic. 
> 
> I refer you to the archives on LP-Pan Yahoo group for more information. 
> Most of the information on NaP3 and PowerSDR-IF can be found there. 
> 
> 73, 
> Don W3FPR 
> 
> On 1/11/2013 11:10 PM, W9TTW Tabb Adams wrote: 
>> Hey I got it figured out just needed a isolator between the radio and 
>> computer. I do have one question on the scope I see the same signals 
>> up and down from the center frequency. One in upper side band and one 
>> in lower side band. Do I have a setting wrong in the option menu? 
>> 
>> 
> 
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