Re: Antuino - the antenna analyzer

Jerry Gaffke
 

Hmm.
Someday, you will have to tell us how it works.
"works on hetrodyne principle" does not quite do it.
Nor does digging around in your code.
That thing isn't on the HF bands, is it?

Curious that it takes all three clocks from the si5351 to measure SWR.
The Bruene bridge, MoniMatch, TandemMatch, and all those other bridges they sell
do it with zero clocks, and some can be quite a bit smaller than all of this.
What do P4 and P3 connect to?  
At what frequency is the antenna system operating?
At what frequency are the three si5351 clocks?
And last but not lest, what the devil is going on around that ADE-1 mixer?

Is that spare raduino now circling the earth, waiting to drop on our heads?
If we catch it, do we get to keep it?

Regardless, very curious, and very cool.

Jerry, KE7ER



On Thu, Dec 27, 2018 at 08:28 PM, Ashhar Farhan wrote:
peeps,
 
while trying to measure the swr on the cubesats, i figured i couldnt use any of the analyzers i had access to. they were simply too big to be stuffed inside a 10 cm cube. my simple resistive bridge was too insensitive for any reasonable work. so, i sat down and made an antenna analyzer from a spare raduino. 
 
the code is wobbly and just about enough to get my work done. it works on a superhet principle. this is not my clever idea, rahul had mentioned this approach taken by a russian builder. i havent seen the original design. it would be interesting if rahul or someone can point me in the right direction.
 
the code and a pdf of the circuit is on https://github.com/afarhan/antuino. i am attaching the circuit for the lazy bones.
 
have a great holiday and get some dx !!
 

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