[hpsdr] Pre-Distortion

[Owen, Michael]

Dear friends,

If you want to sample transmitted RF and don't want to tie up your Bird wattmeter, there are tons of nice directional couplers on eBay for cheap.  Probably cheaper than a sniffer slug for the Bird.  Most are VHF/UHF but this usually means looser (lower) coupling at HF.  Directivity remains good at low frequencies, too.

W9IP

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of David R. Wilson
Sent: Monday, December 09, 2013 9:48 AM
To: hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-Distortion

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

They make sampling hardware:
http://www.bird-technologies.com/~/media/Bird/Files/PDF/Products/manuals/921-4273_75S.ashx


Yes, Bird makes sampling plugs for the model 43 Wattmeter (and other line sampling sections).  The data sheet gives the isolation.

A bit more info on a slug for sampling:

http://www.bird-technologies.com/Products/Plug-In-Elements/7-8-inch-Plug-In-Elements/Nondirectional-Sampler-Elements-for-QC-Type-or-7-8-inch-Line.aspx#.UqXXjUPNRRo

Dave
KU4B


On Mon, 2013-12-09 at 11:01 +0000, Chris Wilson wrote:

>
> > ***** High Performance Software Defined Radio Discussion List *****
>
> > Hi All,
>
> > The progress of the pre-distortion software is remarkable. I suppose
> > the general release is coming up soon. You will need an appropriate
> > RF sampler in the feedback loop to use this great functionality. For
> > all and especially for the home-brewers, who will be prepared for
> > this exciting date, I put some info about such a device on
> > http://www.hamsdr.com/dnld.aspx
>
> > Season's Greetings.
>
> > 73, Helmut, DC6NY
>
>
>
>
> 09/12/2013 10:58
>
> I mistakenly sent the following question direct to Helmut, in error,
> and he has replied directly telling me the Bird slugs emit rectified
> output, not straight RF. But I seem to recall seeing "sniffer" slugs
> for Bird Thrulines, and meters. Do these emit bare RF, are are they
> too a rectified output on the sniffer BNC connector? Looking for a
> none invasive way to use what I have. Thanks.
>
> The question mistakenly sent direct to Helmut was:
>
> ~~~~~~~~~~~~~
>
> Congratulations and thank you for your work with this great
> technology.
>
> A very naive question please? My amp is a single valve (tube) amp, not
> solid state. It has a Bird dual port (forward / reflected with
> separate slugs) Thruline adaptor between output and antenna. Can such
> a device be used to acquire the feedback signal in any way? Thanks
> Helmut, and a very happy Christmas and a healthy and prosperous New
> Year.
>
>
> ~~~~~~~~~~~~~
>


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