crystal frequency

[salviador]

Does this crystal have a frequency of 33.6MHz?

This quartz is connected to a CC1120

[ftg]

If it is connected to the pin 32 of the CC1120, then it very much could be a 33.6MHz crystal oscillator.
It might be a TCXO if the device is doing some long range narrowband stuff on 868MHz or 900MHz bands.

TI CC1120 datasheet[1] does give 33.6MHz as the maximum typical value for the reference oscillator.

The oscillation frequency should be relatively easy to confirm by probing the output pin with an oscilloscope.


1. Section 4.9, on page 14 https://www.ti.com/lit/ds/symlink/cc1120.pdf

[salviador]

Exactly it is on pin 32 as external TXCO.
Unfortunately I don't have the original to take measurements, I only have a photo of an original one.
It works in a frequency of 869.203500 MHz
2FSk modulation.
I put a TXCO of 33.6M. I tried to clone with flipper zero but strangely the pinball machine doesn't replicate the right code!
I also wrote on the flipper forum with all the settings but no one responds. I do not understand the issue

https://forum.flipper.net/t/2fsk-baud-rate-2400-problem/25427