[hpsdr] Include VNA capability in the Pheonix?

[Rob Frohne]

Hi Jeroen,

Thanks for the feedback.  My block diagram was very basic, and as you 
point out it needs to be filled in with buffers, connectors, etc.  
EB4APL's suggestions could be  incorporated with yours, by simply 
calibrating the network analyzer at the remote antenna tuner unit's 
input.  You would need to put an open, a short and a 50 ohm resistor at 
the end of your coax (where the tuner would go) and then you can 
calibrate out that network.  It just makes the calculations a little 
different, but it works fine.  I like your ideas of having the antenna 
tuner at the antenna as well. 

It just seems that the block diagram of the VNA is so similar to the 
block diagram of the Pheonix, we incorporate it with almost no extra cost.

73,

Rob

Jeroen Bastemeijer wrote:
> 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 *****
>>
>>   
>>
>> ------------------------------------------------------------------------
>>
>> 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
>   

-- 
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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