[hpsdr] Pre-distortion Sampler

[Clyde Washburn]

It is not difficult to build an external RLC compensator to flatten the output of samplers -- I have done so on the output of a Bird
4273. Within +/-1dB 1.8-50MHz is attainable.
Clyde, K2UE


-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Helmut, DC6NY
Sent: Wednesday, December 11, 2013 4:38 PM
To: 'Shirley Márquez Dúlcey'; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-distortion Sampler

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

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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