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I had a DVB card since long
time ago . some days ago I start to Install and test it
. It was a very good experience. I was saw some small
devices which called Satellite Finder and now I decide to build
a Finder myself as a small and hobby project . I start to
search within the internet to find some
other project of other developers but as I found there
was no any other open project on the internet. any
things available was some thing for measuring output
power of a high power transmitter (PA) or SWR meter,
some projects that I had experience on it (here).
even in too many forums too many people have sent some
questions to find this project schematic but nobody got their answer correctly.
In real and in commercial
usage (and for better stability) it is too better to use
a double side copper fiber glass PCB for any projects
like this. one side completely for ground and other side
for components, and this two sides have too many
junction between ground of components side and full
ground side . this can decrease skin effect and improve
stability. the device can stops from working if
component pins length be a little long, thus cut the
components pins as much as possible and install those
very close together. I've use a 2SC3355 Hi frequence NPN
transistor in the first RF stage, this stage amplify the
signal level of the LNB . after some researching on the
web I've found some small chips (like
mPC2708TB from NEC) with Hi gain and very Hi
bandwidth which were very useful for this project but I
couldn't found those chips here (IRAN). I've used two
ultra fast schottky diode which you can replace it with
any other diode which can work in 2GHZ or even you can
simply use base-emitter of two other 2SC3355 as high frequence diode. the project has two R.F.C coil that you
can build it yourself with turning 30 turn of 0.6mm
colored wire over 4mm thickness cylinder.
Building and using this
project is without any warranty . The goal of building
and releasing this project was only for educational
purpose and for an experience on very very hi frequence
systems .
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