Download Satfinder

Then I builded the little quick and dirty satfinder from the top picture, builded against all SHF rules but it supprised me. After some tweaking it turned out to detect from -55dBm (but then you only see a little movement) and very usable from -40dBm. Sensitive enough for satelite finding.

The sat tuner gives a +13 or +18VDC voltage to energise the LO in the LNB. The LNB mixes the sat signal to around 1-2 GHz. The level should be between -50 and -35 dBm according to others, I have not checked with my SA. So the satfinder can be powered from that voltage and must detect that RF. In the schematic a LED is added to shows you if the LNB voltage is on. If you do more tuning it could be easy to add a 16V zener resistor and a diode before the regulator. If the LNB is on the led after the 7809 will burn and the led from the zener. But if the tuner switches to +13, only the led after the 7809 stays on.

Download Satfinder

Download 🔥 https://urlca.com/2y2FH3 🔥

Finally the problem was deeper. The tuner switches between 3 LNBs using a so called Diseqc switch. It is controlled by 22KHz tone bursts. My 10 year old switch had a factory fitted intermitting short and a resistor that was mounted only on one side and 90 degrees the wrong direction. So the port Astra 3 was on had never worked. After fixing this the satfinder helped to set all right within 10 minutes. ff782bc1db