[PSDR] Reference antenna problems

[Bart Kus]

Well, it seems the situation is a LOT better with the parabolic 21dBi 
antennas:





Since these are identical models and the variances seen in the top trace 
represent twice their error, these are indeed quite nice even leveled 
antennas, at least at this 2ft distance apart.  Gotta do more testing @ 
various other locations and separation distances to verify everything is 
cool.

--Bart

On 12/11/2012 2:23 AM, Bart Kus wrote:
> Hello,
>
> So I tried to measure the reference antennas (simple dipoles). It's 
> kind of a disaster.  With the antennas only 2ft apart:
>
>
>
> The received signal is pretty weak:
>
>
> The marker is down 20dB from the previous measurement:
>
> I guess that pair of sectors I was using were really helping things 
> out.  I'm also concerned about the uneven response, but that could be 
> multipath given the really low signal levels.  Does anyone have any 
> experience with antenna measurement like this? I'm thinking my next 
> step is using the 21dBi parabolic dishes as the reference antennas 
> instead.  Having thought about it, the high directional gain, although 
> it would need precise alignment to make accurate measurements, would 
> help with ignoring/overcoming multipath, no?  Some of those peaks and 
> valleys might disappear. A 20dB range over the spectrum is pretty 
> ridiculous.
>
> --Bart
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: hciaibdj.bmp
Type: image/bmp
Size: 921658 bytes
Desc: not available
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment.bin>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dehfgjeh.jpg
Type: image/jpeg
Size: 219437 bytes
Desc: not available
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 1536990 bytes
Desc: not available
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 6072 bytes
Desc: not available
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 8699 bytes
Desc: not available
URL: <http://mail.hamwan.net/pipermail/psdr/attachments/20121211/25cdd513/attachment.gif>