[hpsdr] Include VNA capability in the Pheonix?

[Jeroen Bastemeijer]

Dear Rob,

Great idea! Some suggesttions to make full use of the "extra VNA".
* Add a buffer amplifier to the oscillator (to increase output-power and 
protect the DDS)
* Provide three small RF connectors (SMA e.g.); one connected to the 
RF-source, one connected to the cosine-mixer (reference) and one to the 
sine-mixer (input)

By providing two measurement ports (reference&input), one can use an 
external directional coupler allowing full S-parameter tests! This 
means, it will be possible to measure both passive and active devices. 
For further reading have a look at this application-note from Agilent: 
http://cp.literature.agilent.com/litweb/pdf/5965-7917E.pdf

The suggestion of Ignacio EB4APL seems interesting as well. However, I 
would opt for a remote controlled antenna tuner directly at the antenna. 
This will keep a 50 Ohm load at the coaxial line.

Good luck with the Phoenix design! 73s Jeroen PE1RGE



Rob Frohne wrote:

>***** High Performance Software Defined Radio Discussion List *****
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>  
>
>
> ------------------------------------------------------------------------
>
> Hi Everyone,
>
> It seems to me that we can include without much overhead at all vector 
> network analyzer capabilities in the Pheonix board.  While there are 
> other stand alone VNA options available (N2PK and IW3HEV), I think the 
> large dynamic range, and other good specs of the Pheonix will yield a 
> better VNA than those options.  The block diagram for a narrow band 
> VNA that fits our architecture is shown in a sketch I put on the web 
> at:  Vector Network Analyzer Block Diagram 
> <http://frohro-g5.wwc.edu/%7Efrohro/VNA.jpg>
>
> Have a look at it, and share your thoughts with us!
>
> Tnx & 73,
>
> Rob, KL7NA
>
>-- 
>Rob Frohne, Ph.D., P.E. 
>E.F. Cross School of Engineering
>Walla Walla College
>100 SW 4th Street
>College Place, WA 99324
>(509) 527-2075			 http://www.wwc.edu/~frohro
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-- 
Ing. Jeroen Bastemeijer

Delft University of Technology
Department of Electrical Engineering
Electronic Instrumentation Laboratory
Mekelweg 4, Room 13.090
2628 CD Delft
The Netherlands

Phone: +31.15.27.86542
Fax: +31.15.27.85755
E-mail: J.Bastemeijer at EWI.TUDelft.nl

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