[RTTY] Checking Sound Card performance on RTTY withAudio Analyzer

[Jim W7RY]

>If you are home brewing your own digital interface, it is probably worth 
>paying careful attention to any isolation transformer that you use.  In 
>many cases, you are better off with >no transformer at all between the rig 
>and the sound card, and instead, carefully bonding the ground of the sound 
>card to the ground of the rig (see that first photo in the web >page above, 
>where I had used the balanced input of the E-MU sound card, and grounding 
>the E-MU to the rig with a short piece of wire).  An inexpensive 
>transformer is almost >bound to have a worse IMD than the IMD from your 
>sound card -- sometimes it is better to remove ground loops by starting 
>with no ground induced noise in the first place :-).

>In short, the sound card is very often not the weakest link in your audio 
>chain.  Fix everything else first, and then, come back to the sound card.

>73 (back to counting decibels :-)
>Chen, W7AY

Now that is an interesting statement I never would have thought!

What about using a couple of large capacitors (100 to 1000 uF) in series 
with the audio between the rig and the sound card?

Thanks Chen



73
Jim W7RY