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I remember Farhan mentioning that the clock out of the Si chip is not
will cause wrong readings due to harmonics. To solve this, mix down and
through a filter and then take the reading which will not have
At 28-12-18, you wrote:
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
The Bruene bridge, MoniMatch, TandemMatch, and all those other bridges
do it with zero clocks, and some can be quite a bit smaller than all of
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
Is that spare raduino now circling the earth, waiting to drop on our
If we catch it, do we get to keep it?
Regardless, very curious, and very cool.
On Thu, Dec 27, 2018 at 08:28 PM, Ashhar Farhan wrote:
- 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 !!