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Thursday, 10 January 2013

DiSEqC Monitor


In search of knowledge regarding the DiSEqC protocol, I came across the "DiSEqC Monitor" article in the Elektor magazine, edition 2006/09: Click here to open the Elektor article from their website

Since I don't have an easy access to SMD components and the PCB seemed a bit expensive, especially considering shipping, I decided to build the device using regular sized components on an experimental PCB. Naturally the finished product looks chaotic and so does my shack:


In the end, everything worked, but it took me about 1 hour to figure out that the flags/fuses for the PIC were wrongly set (LVL needs to be turned off and the external oscillator needs to be activated).

Here is a video showing the device in action:


At this moment it still picks up some garbage, probably because I had to do without the low pass filter, which uses two coils. I can't get hold of them in local stores. Shouldn't make a big difference anyway.

[Update]
Just noticed this update from the Elektor website:
This could explain why I get clean DiSEqC commands from my KWS AMA 210S, but lots of garbage from a low cost satellite receiver! Definitly worth a try...
[/Update]

For further information regarding the DiSEqC protcol, I recomend this website: http://www.diseqc.org/

Cheers,
vma


Saturday, 5 January 2013

Trying to tune Eutelsat 5 West A (5.0W) at 11509MHz - DVB Newtec 8PSK Modulation

As the title says, today I tried to get a lock on Eutelsat 5 West A (5.0W) at 11509MHz. This transponder is modulated with DVB Newtec 8PSK.

To make it short: none of my satellite meters was capable of getting a signal lock.

Still, the Kathrein MSK 33 could at least give a hint on the modulation through the constellation diagram, despite of only being able to demodulate QPSK.


I tried the Spaun Sparos 609, as well. Naturally it could not lock, either, despite having a DVB-S/S2 tuner:


Cheers,
vma