# \[qBox\] radio frequency power out from the antenna

**URL:** https://openuc2.discourse.group/t/qbox-radio-frequency-power-out-from-the-antenna/126
**Category:** Support and Help Desk
**Created:** [September 8, 2026, 5:43pm UTC](https://openuc2.discourse.group/t/qbox-radio-frequency-power-out-from-the-antenna/126 "2026-09-08T17:43:13Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![wanghaoran1207](https://avatars.discourse-cdn.com/v4/letter/w/85e7bf/32.png) [@wanghaoran1207](https://openuc2.discourse.group/u/wanghaoran1207)
#### Post date: [September 8, 2026, 5:43pm UTC](https://openuc2.discourse.group/t/qbox-radio-frequency-power-out-from-the-antenna/126/1 "2026-09-08T17:43:13Z")

</div>

I am using the qBox recently to do the ODMR experiment, and I have two questions I couldn’t answer from the docs.

The board uses a ADF4351 as VCO, according to the datasheet, the maximum output power is +5dBm but:

- Has anyone measured the actual power at the SMA connector at ~2.87 GHz?
- I think the USB port from a laptop can provide only limited power, what will be the power range when drive the board through a computer? Will it be different if you use a proper power supply?