BHAN85
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On your board, yes. An amplifier is installed behind the matching transformers.
There are no amplifiers on the Geran board. Only transformers and feeder.
An amplifier is not needed to receive a GNSS signal. Four channels are used for spoofing suppression. And it requires special firmware.
Geran contains a cropped simple GPS antenna, which indicates a modification.
Only one channel is used for transmission. This is clearly seen in the photo of the wreckage. And it's not connected anywhere.
More interesting is that it contains some Russian components.
In the pict you posted TX2 is used, and it can't be seen if it's connected somewhere or not.
It has no sense that board/box without tx use, I think you dont identify what is a PA.
PA is a tiny IC. It's not a big component.
And I like said before, you dont need FPGA and SDR components to implement only a GNSS receiver, it's a lot cheaper use a hardware designed for that.