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I'm doing reverse engineering on a hardware of an equipment, this equipment is able to identify the presence of a RF signal from a key fob.

Unfortunately, it was not possible to identify the integrated circuit, it has a mask, a number that makes no sense to me and I was not able to find information about it.

I don't know either the exactly values of the capacitors, I cannot remove them from the circuit. So, I would like to know, based on the incomplete information of the figure below, could someone identify, or make a guess, about which integrated it would be?

enter image description here

Below is the image of the antenna of the circuit. The other circuit components are on the other side of the board

enter image description here

EDITED: Below is the image of the IC, the code printed on it surface:

506

1403

M83

enter image description here

PS: Sorry for the lack of information in the question, any information or guess may be valid.

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    \$\begingroup\$ do you have a picture of the IC? Generally, I think without proper IC markings, you'll be out of luck, unless you start reverse-engineering the RF signal yourself: there's a lot of cheap receiver ICs \$\endgroup\$ – Marcus Müller Mar 20 at 14:49
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    \$\begingroup\$ Whatever it is, it won't be anything as simple as a "frequency meter." The fob will transmit data on the radio signal. Your IC will receive the signal and decode the data. \$\endgroup\$ – JRE Mar 20 at 14:51
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    \$\begingroup\$ You need to post a picture of the IC, and write out the numbers printed on it as best you can decipher them. \$\endgroup\$ – JRE Mar 20 at 14:51
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    \$\begingroup\$ Also "the number makes no sense to me": well, it might make sense to someone else, that's why you're asking, right? so, what's the number? \$\endgroup\$ – Marcus Müller Mar 20 at 14:53
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    \$\begingroup\$ @Daniel sadly, you were a bit right, and that number doesn't strike much of a bell with me, but the picture says "IC without even a manufacturer logo", so chances are this is something extremely low-cost; maybe some old analog IC, which would explain the custom packaging. \$\endgroup\$ – Marcus Müller Mar 20 at 17:35

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