[hpsdr] Pre-distortion Sampler

[Helmut, DC6NY]

Hi,

RF samplers with capacitive divider have no flat frequency response. A
difference of 10-15 dB between 2 and 50 MHz may be sufficient for monitoring
but not for measuring. In the case of the pre-distortion loop new
attenuation adjustment would be necessary after each band change. Not
acceptable!

73, Helmut, DC6NY

73 -----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Shirley Márquez
Dúlcey
Gesendet: Mittwoch, 11. Dezember 2013 21:07
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Pre-distortion Sampler

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

The January 2014 issue of QST has a design for a homebrew signal sampler.
The design uses a capacitive divider with 38dB attenuation followed by a
22dB resistive attenuator. This might serve as a starting point for a
sampler for predistortion designs.

On Mon, Dec 9, 2013 at 11:35 AM, Tony Hagen <prosdr at gmail.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
> I received my Rigol spectrum analyzer few weeks back The spectrum 
> analyzer with input requirement of max +20dBm.
>
> Is the pre-distortion sampler can be used to couple the output of 
> Munin or any other amplifier of approx. 200 watts with the spectrum 
> analyzer
>
> 73s
> Tony
>
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