DIY 2.4 Ghz impedance equipment site help

Hi all,
I saw a site where a fellow designed a unit to measure impedance at 2.4
ghz,
for use on wifi antennas. I don't recall if it was return loss or impedance.
It gave detailed instructions on how to build and also had ready built units
for sale.
I think it was a ham that designed the unit. I also think he was not in the
states,
possibly a P or PY call sign, but the memory is not good!
Any help would be appreciated.
Thanks, Mike

"Jeff Liebermann" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Sun, 18 Oct 2009 13:35:37 -0500, "amdx" <(E-Mail Removed)> wrote:
>
>>Hi all,
>> I saw a site where a fellow designed a unit to measure impedance at 2.4
>>ghz,
>>for use on wifi antennas. I don't recall if it was return loss or
>>impedance.
>>It gave detailed instructions on how to build and also had ready built
>>units
>>for sale.
>>I think it was a ham that designed the unit. I also think he was not in
>>the
>>states,
>>possibly a P or PY call sign, but the memory is not good!
>> Any help would be appreciated.
>> Thanks, Mike
>>
>
> This one?
> <http://pe2er.nl/wifiswr/index.htm>
> or one of these:
> <http://www.qsl.net/n9zia/wireless/appendixF.html>
>
> What I do is use a return loss bridge as in:
> <http://www.qsl.net/n9zia/wireless/pics/rtrn_loss_bridge.png>
> I've built several out of chip resistors and junk parts. I have one
> that works well up to about 8GHz. Great for testing antennas. That's
> what's inside a Telonic Rho-tector (which can usually be found on eBay
> for cheap). A few models go up to 2.4Ghz.
>
> You'll also *might* need a microwave load or three. 50 ohms for a
> reference, but also some other known values for calibration.
>
> The problem is that you'll need an RF sweep generator to use this
> effectively. It's also not a VNA (vector network analyzer) so it
> won't tell you if any reactance is capacitive or inductive.
>
> --
> Jeff Liebermann (E-Mail Removed)
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558

Thanks Jeff,
This is the one I wanted.
<http://pe2er.nl/wifiswr/index.htm>