Bob Rock said:
There is a common understanding or law in electronics That a higher potential can flow into a lower potential Like if one recvier would be putting out 13.1 volts and another would be putting out 13.0 volts then that difference of .1 volts would flow threw the other reciver would be a very small voltage and current so I would not really feel a danger for damage but it all dependes on the designs of the recivers in question so luck would be an issue here....Theory is just theory practical world is another.....
Bob, yes, I understand what you're saying, but I don't have both receivers connected to the same coax with a splitter... So... The big question here is, is whether or not the slave output on a receiver (the Fortec in this case) is connected internally to the IF input with a simple splitter circuit (couple of resistors), or with a DC blocker that is switched inbetween the IF input and slave output....
I have done some experiments this morning and found this:
- Fortec (master) on, Twinhan (slave) locked to H or V polarity, depending on what the Fortec is set to. 22KHz signal also doesn't appear to pass through from the Twinhan to the LNB (or motor, or DiSEqC switch.
- Fortec (master) off (using the standby button): 102G slave has full control of the motor, DiSEqC switch and LNB H/V switch.
- Fortec (master) off using power switch on back of unit (same as unplugging it): 102G slave gets no signal at all, regardless of H/V polarity etc. Looks like IF is completely disconnected from the Slave output.
Looks a lot like the Fortec has some kind of DC block switch it puts inbetween the IF input and Slave output depending on whether it's on or off... Can anyone confirm if this is the way these receivers work?
If that is the case, you should never need a DC blocker if you hook up other receivers through the slave connection. Obviously, if you use a regular splitter (I don't know why you'd do that... but ok), then you would use a DC blocker to prevent "clashing" with the voltage of the other receiver as Bob said...
Robbert