AC components

[Orbit]

Does anyone know the AC-coded component, what it could be? Otherwise, it is an electric antenna for the car Audi TDI ...

[Carl-NC]

Balun or transformer, maybe? Did you try to ohm it?

[Idefix]

Is this the board for an amplified antenna?
Is there other component on the bottom layer?
(red and black wires are for Power supply I guess. )

What are the two holes holes connected to? The holes seems metallized. Does it goes to something ? or only to the roof or some metallic part?

I suppose this printed lines are for making a counterweight of the active spiral part. Making a short and compact lambda/2 antenna. With some matchning component after that and an amplifier . The RF signal is going through the red wire, and at the other side of red wire, (this need some L and C to separate RF from DC.)

[Orbit]

[Idefix]

OK.



OK Sorry, i don't saw the AC marking before.
So I havn't understood the question.


I dont see the 150 resistor on your schematic.
Is the red wire the original connection from the car?

At the moment, (but i don't understand the polarisation) I guess that AC marked component can be a transistor .

[Carl-NC]

Still looks like a balun or a transformer, although I don't understand the LED as it is not DC-isolated.

[Orbit]

Resistor from 150 r I added it myself, that's why it's not on the scheme the red conductor is the inner conductor rg 58 which comes from the antenna cable and black is the gnd of the cable ! When measuring where the input of the coil is via the capacitor, I measure it as an npn transistor but the biggest stupidity is that it does not amplify the radio signal at all...
Here's a picture of Chinese crap:

[Orbit]

Still looks like a balun or a transformer, although I don't understand the LED as it is not DC-isolated.

Yes I tried to isolate the dc voltage to the radio with a 102 capacitor and the same story !

[Idefix]

After some digging, it could be a mmic like a bga616 from infineon. (but not this one because marking should be BPs)

https://www.infineon.com/dgdl/Infine...15419102bb163b

[Idefix]

If I suppose this AC component to be a MMIC with the same PIN out, then it is not soldered in the good way. It must be turned by 90°, to match the pinout.

So, does this item works one day? Is it possible to be a wrong soldered item?
In other hand, if this is a chinese component, It is also possible to have a different pinout from infineon or others . And it looks like a SOT 343 but one pin must be larger.

[Idefix]

Hello Orbit, any news ?

Here another component. With 2 pins for ground, and the Power and Output on the same pin.