[hpsdr] Pre-Distortion

[William H. Fite]

Helmut and all,

Since I already have the Precision RF SMT-Pro Station Monitor and also a
0-60dB attenuator, couldn't I just connect them in series and set the
attentuation level anywhere I want it (>50dB, I mean)?

Bill


On Mon, Dec 9, 2013 at 10:28 AM, Bruce Beford
<bruce.beford at myfairpoint.net>wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> 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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-- 
I can explain it for you, but I can't comprehend it for you.
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