# HackRF TXCO Install
![[cover_hackrf1.jpg]]
```date
Date: 27 Nov 2022 21:00
```
Quick reference for installing the TCXO on a HackRF One.
# Pinout
The TCXO module gets installed on the 12-pin P22 connector on the HackRF One. You will want to install the module on pin 1, which is closest to CLK IN / OUT on most boards.
# Testing
To test, you will want to run the following command, which can be built from the [HackRF source](https://github.com/greatscottgadgets/hackrf):
```
hackrf_debug -–si5351c -n 0 -r
```
If all is working, you should get the following output:
```
[ 0] -> 0x01
```
If your output does not match this, that means that the TCXO is not being used. The HackRF One firmware may need to be updated.
Happy hacking!
`<3 m0x`
#notes #hackrf #sdr #rf #tcxo