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

Kevin Hung cykhung at gmail.com
Tue Nov 7 18:06:47 EST 2017


Now I am very tempted to try it out and see how many coworkers believe the
metal hat.

On Tue, Nov 7, 2017 at 3:31 PM, Dan CaJacob <dan.cajacob at gmail.com> wrote:

> It's a joke :)
>
> On Tue, Nov 7, 2017 at 2:21 PM Kyeong Su Shin via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
>> It will act as a RF shield. (see: https://en.wikipedia.
>> org/wiki/Electromagnetic_shielding )
>>
>> Not a recommended way to protect yourself from strong EM waves, but it
>> does make a good joke.
>>
>> Regards,
>> Kyeong Su Shin
>>
>> On Tue, Nov 7, 2017 at 11:01 AM, Kevin Hung via USRP-users <
>> usrp-users at lists.ettus.com> wrote:
>>
>>> Hmm, I am just curious. What does the metal hat do?
>>>
>>> On Mon, Nov 6, 2017 at 11:38 PM, Dan CaJacob via USRP-users <
>>> usrp-users at lists.ettus.com> wrote:
>>>
>>>> But if you want to have some fun with your co-workers. Put on a metal
>>>> hat whenever you TX. If they ask what's going on, say "Don't worry about
>>>> it" :)
>>>>
>>>> On Mon, Nov 6, 2017 at 4:49 PM Bakshi, Arjun via USRP-users <
>>>> usrp-users at lists.ettus.com> 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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>>>>> USRP-users at lists.ettus.com
>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>> --
>>>> Very Respectfully,
>>>>
>>>> Dan CaJacob
>>>>
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>>>>
>>>>
>>>
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>>>
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> --
> Very Respectfully,
>
> Dan CaJacob
>
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