[hpsdr] Pre-Distortion

[Bruce Beford]

I agree.

For users to properly implement the pre-distortion techniques, both
isolation within the complete system and appropriate attenuation of the
sampled signal will be needed. Achieving the required isolation through the
TX chain may take special care, and possibly (probably?) modifications to
existing T/R switching...

I am glad to read updates on this exciting development work. Thanks for all
your efforts.

73,
Bruce N1RX


-----Original Message-----
From: Helmut, DC6NY [mailto:dc6ny at gmx.de] 
Sent: Monday, December 09, 2013 10:21 AM
To: 'Bruce Beford'; hpsdr at lists.openhpsdr.org
Subject: AW: [hpsdr] Pre-Distortion

Hi Bruce, 

you are right. Sometimes it's difficult with the correct terminology, hi.
Isolation has to exceed maximal used attenuation. And here are the traps
hidden: When cross-talk isolation inside the radio is too small the
pre-distortion 'mechanism' could react on the driver signal instead of the
amp output signal. 

73,Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Bruce Beford
Gesendet: Montag, 9. Dezember 2013 15:55
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Pre-Distortion

***** High Performance Software Defined Radio Discussion List *****

I believe total available "attenuation" would be more accurate than
"isolation" in this case.
-Bruce, N1RX

> Oh, OK.  I thought that you meant "isolation" in the context of a 
> directional coupler... 77dB!

> Thank you - I look forward to more developments!

> W9IP


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