NooElec Tiny TCXO: 0.5PPM TCXO Module for HackRF. Plug & Play, Compatible Aluminum Enclosure for HackRF & GSG Acrylic Enclosure. 0.5PPM, Ultra-Low Phase Noise, Ultra-Low Profile

Great product, reasonable price. I bought this to use in a non-HackRF project but couldn't find any pinout info so for anyone interestedLooking at the HackRF One schematics and Gerber plots, supply voltage is 3.3V Pin 6 is VCC (+3.3V) pin11 is GND and pin 7 is CLKOUT - 1.8V OutputI wanted a PMOD compatible 10MHz TCXO, and this is the closes I could find. Managed to get it workingwith a Zybo-Z7 FPGA board by using a differential buffer and setting the the input I/O standard to TDMS_33Looking from the top (pins down)6 5 4 3 2 1--VCC--NC----NC--NC--NC--NC--NC---GND--NC--NC--NC--CLKOUT12 11 10 9 8 7

Plug 'n play TCXO. Just unscrew the case and pop the board into the end of the P22 riser that's next to the clock input SMA connector.If you've installed hackrf tools, you can see if the module has been detected by issuing the following:hackrf_si5351c -n 0 -r[ 0] -> 0x01The command will return 0x01 if it's using the new TCXO.