Re: [Discuss-gnuradio] [USRP-users] usrp N210 antenna selection

[Marcus Müller]

Hi Sreena,

usually, you want an antenna matching your carrier frequency.
Many simpler antenna geometries (basically, dipoles) scale down
relatively gracefully when used at wavelengths larger than what they
where designed for,
only loosing a few decibels.
I have seen people do ~30MHz TX with an USRP using naught but a
straightened paperclip, but they're reach was in the 0.5m-4m range...
I personally would not call this antenna, because I suspect it was not
actually used to emit waves but to couple an electrical field into the
receiver antenna directly (distance being significantly smaller than
wavelength).

Again, if this works depends completely on your application.
If you're building a communication system, you will have to buy hardware
for your desired frequency band sooner or later, anyways.

As it seems to me, you're neither already bound to a specific carrier
frequency, nor to a specific antenna (since you don't have one yet), and
I don't know if you have access to daughterboards with a different
frequency range; I actually don't know anything about what you're trying
to do.

If you could shed some light on your desired usage, it would actually be
possible to really be of help to you ;)

Greetings,
Marcus

On 01.05.2014 17:16, sreena pathangalil wrote:
> Hi Marcus
>
> Thanks for the reply.
> Since low frequency antenna is not available at the moment will adding a
> gain for the signal prior to USRP sink and receiving the signal at a near
> distance would be feasible, if i use antenna in 100MHz - 300MHz range?
>
> Regards
> Sreena
>
>
> On Thu, May 1, 2014 at 7:26 PM, Marcus Müller <address@hidden>wrote:
>
>>  Hi Sreena,
>>
>> the choice of an antenna completely depends on your application, mainly on
>> your carrier frequency.
>> That is (most probably) the same frequency you set as center frequency for
>> your uhd_source/sink;
>> that choice is completely yours (within the 0-30MHz range, though).
>>
>> Note however that antennas for such low frequencies tend to be large if
>> they need to achieve reasonable reception.
>> Again, "reasonable reception", your choice of frequency and antenna design
>> are completely up to you and
>> depend heavily on your intended application.
>>
>> Greetings,
>> Marcus
>>
>>
>> On 30.04.2014 12:29, sreena pathangalil via USRP-users wrote:
>>
>> Hi
>>
>> I am working with the LFRX, LFTx daughter boards (0- 30MHz) . what should
>> be the antenna specifications to be used for transmission and reception.
>> also what should be the centre frequency of the uhd-source/sink ?.
>>
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing 
>> address@hidden://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> address@hidden
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>