[USRP-users] TX power levels. Long term exposure.

Nick Foster bistromath at gmail.com
Fri Nov 10 14:06:36 EST 2017


There is nothing you can do with a USRP to expose you to harmful levels of
RF energy. You would need to add an amplifier.

On Fri, Nov 10, 2017 at 11:04 AM Arjun Bakshi <bakshi.11 at buckeyemail.osu.edu>
wrote:

> Wanted to further clarify something. Do you mean that a usrp will in most
> cases stay below acceptable levels, or that my specific setup is safe?
>
> Like TX at 520mhz makes the snr much higher compared to that at 1.2GHz.
>
> Thanks
>
> AB
>
> ---- Bakshi, Arjun wrote ----
>
> Thanks for clearing that up.
>
>
> AB
> ------------------------------
> *From:* Nick Foster <bistromath at gmail.com>
> *Sent:* Monday, November 6, 2017 3:58:05 PM
> *To:* Bakshi, Arjun
> *Cc:* usrp-users at lists.ettus.com
> *Subject:* Re: [USRP-users] TX power levels. Long term exposure.
>
> Don't worry about it. You are several orders of magnitude below any sort
> of permissible exposure limit.
>
> Nick
>
> On Mon, Nov 6, 2017 at 11:21 AM Bakshi, Arjun via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
> I'm looking to do long duration experiments in a lab which will have
> people in it while I TX and Rx, and I'd like to know what health and safety
> concerns I should keep in mind.
>
>
> I tried looking at FCC and EU for limits on radiation levels, but those
> specs aren't straightforward to understand. It's also difficult to get an
> estimate of absolute power rxed/txed from the USRPs. So I'd like to hear
> from anyone who knows about this stuff.
>
>
> I'm using SBX (max power 100mW), and I'm thinking of using either the
> 500-700MHz or the 1.2-1.3 GHz band. I'll be transmitting for *5ms every
> second for a few hours*. The room is about 6m x 15m. Then antennas will
> be 1-2 meters away from a few people. TX and RX are about 4m apart. With
> gain set to 25dB, my signal has ~30dB SNR.
>
>
> Sorry if this seems a bit odd/specific.
>
>
> Thank you,
>
>
> AB
>
>
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>
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