GI_Joe
03-10-2011, 07:14 PM
I have been bothered by the fact that I could not tell "just by looking" at a DiSEqC switch which port is selected. To solve the problem I built up a small circuit that will light up an LED for whichever port I have selected by the receiver.
I use this on a FTA receiver where the receiver is NOT connected to a TV, It is used exclusively for receiving audio, from two separate dishes.
The circuit will pull voltage from the selected port and does not seem to attenuate the RF signal very much. This is due to the RF chokes in the circuit that blocks the RF, but passes the DC voltage. I did not do any RF loss measurements (before and after) but the singal I am receiving is strong enough to overcome any loss.
You could take this one step further and use bi-color LEDs which will change color depending on the selection of Vertical or Horizontal polarity (13 or 18 VDC). You would probably have to change the value of the resistors to get the proper bias voltage on the bi-color LEDs.
I use this on a FTA receiver where the receiver is NOT connected to a TV, It is used exclusively for receiving audio, from two separate dishes.
The circuit will pull voltage from the selected port and does not seem to attenuate the RF signal very much. This is due to the RF chokes in the circuit that blocks the RF, but passes the DC voltage. I did not do any RF loss measurements (before and after) but the singal I am receiving is strong enough to overcome any loss.
You could take this one step further and use bi-color LEDs which will change color depending on the selection of Vertical or Horizontal polarity (13 or 18 VDC). You would probably have to change the value of the resistors to get the proper bias voltage on the bi-color LEDs.