vivadatv.org

Hello,

As its not sure we always be able to get the tuner we need, as there are difficult to find when they don't completely disappear from the market,
I have decided two month ago to build my own.
We have many solution for finding good Nim Tuner.
The USB chips used with almost USB tuner of the market is the CY7C86013A.
(Prof7500 = NIM EARDATEK + CY7C86013A, STB5980 = NIM EARD + CY7C86013A ......)

on this side there is only the Nim Tuner EARDATEK and capacitors

We can see on this side, that there are only component for power supplying the Nim tuner + power supply for LNB and CYC786013A for usb interface.
I have began 2 months ago to study this chip, but it is a very powerful chip that takes time to develop for the first time with it and my chineese sample was not sure to work well.
So I have chosen to test also a second solution less powerful but less "eating time" : use the FT2232H I already used with my Digilite modulator.

My first step was to test the I2C dialog between FT2232H minimodule and the Samsung NIM


And now develop Check software for this first build


As now I have made good test for this first step, I go to the second step : program the chip inside the NIM to check if I can lock on a DVB-S signal and specialy a very low SR signal (SR250)


Well! I am in the good way

Last step:
I chose to use 5V external power supply, so I have to give on this board the 3.3V and 1V need by the demodulator
I want also now get the TS data coming from the NIM tuner when it is locked, so I add a 3 NAnd gates 74HC10 and wire bus between the NIM and the Minimodule



That's all!!
If we don't need anything else ( 13v or 18V for LNB and 22kHz) the schemtic is complete. Nothing to add! and it works very well at very low SR ( down to SR125 kS/sec)


As you can see there is a new software that can be used with this MiniTiouner : Minitioune.

Jean-Pierre F6DZP

Good evening all,
is this available as a kit? or PCB?

As complete technophobe I need all the help I can get.

any help would be much appreciated.

thank you


Dave
G7MEG

Hello,

In UK, the BATC has made a pcb and a kit.



More information here:

http://www.batc.org.uk/forum/viewtopic.php?f=15&t=4225

pcb, NIM, Minimodule are available at the BATC shop.

Jean-Pierre F6DZP

Hi Jean-Pierre,
thank you for the response. Unfortunatley BATC discontinued the kit sometime ago, only supply the board and usb controller, which ive ordered. I will use the BOM to source the other parts. one concern is getting the right NIM.

regards

Dave
G7MEG

Hi Dave,
how did you get on with the Minitiouner? BATC now have bare boards and NIMs in stock, along with the USB module and 1v1 regulator.

I've finally got mine built, got the software sorted with help from the IT department (my good lady, M0PSZ) and hopefully this evening whenthe repeater fires up I will be receiving GB3SQ.

Good luck

Mac - M0VLT

Hello,

as the forum hard disk crashed in 2016, we lost all information between June 2015 and May 2106, I put some back...
Schematic

My first prototype using a NIM Samsung DNBU10711IST



Using the NIM Eardatek EDS-4B47FF1B+


Using the NIM Sharp BS2F7HZ1069

Bon travaille et félicitation pour ta création. Je te souhaite le succès et bonne continuation pour tes prochains projets.


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Just as an additional information...

On this site
https://forum.batc.org.uk/viewtopic.php?t=4102&start=20
the DNBU10512ISA is listed as a potentially suitable NIM, but with a question mark.

Here is what is inside of this NIM:











The tuner is an STV6110A and the demodulator is an Availink AVL2108LGa.

So it probably won't work with MiniTioune.