neazoi
Advanced Member level 6
Hi I want to combine 8 loop antennas into one structure, each of them at a different angle to the others. By using 8 relays, I want to select each of these 8 loops so that I can null a signal at a wanted direction. So instead of using a single loop and a rotor, to use multiple loops and select each of them.
Now the problem I have is that I have only a coaxial which I will use for the signal and as a phantom power to the loop preamplifier. No other cables are allowed.
So I am trying to find a simple way to energize each of the relays and de-energize the others, so that only one loop is selected each time.
I was thinking of a higher variable input voltage to the coaxial and a way to detect the different voltage levels and energize the appropriate relays.
Can you think of any voltage level detector circuit that can do this?
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I think I will use this one **broken link removed** it seems promising. But how can I replace the LEDs with transistors, so as to switch relays instead of lit LEDs?
Or can I connect the relay coils in place of the LEDs directly? How much current can each output of the chip sink in DOT mode?
Now the problem I have is that I have only a coaxial which I will use for the signal and as a phantom power to the loop preamplifier. No other cables are allowed.
So I am trying to find a simple way to energize each of the relays and de-energize the others, so that only one loop is selected each time.
I was thinking of a higher variable input voltage to the coaxial and a way to detect the different voltage levels and energize the appropriate relays.
Can you think of any voltage level detector circuit that can do this?
- - - Updated - - -
I think I will use this one **broken link removed** it seems promising. But how can I replace the LEDs with transistors, so as to switch relays instead of lit LEDs?
Or can I connect the relay coils in place of the LEDs directly? How much current can each output of the chip sink in DOT mode?