Send USRP-users mailing list submissions to
[email protected]
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
or, via email, send a message with subject or body 'help' to
[email protected]
You can reach the person managing the list at
[email protected]
When replying, please edit your Subject line so it is more specific
than "Re: Contents of USRP-users digest..."
Today's Topics:
1. Re: The receiver ADC goes into saturation (Dan CaJacob)
2. Re: The receiver ADC goes into saturation (Marcus M?ller)
3. Re: The receiver ADC goes into saturation (Marcus D. Leech)
4. B200 - Spurs at the frequency domain (Daniel Malafaia)
----------------------------------------------------------------------
Message: 1
Date: Sat, 25 Oct 2014 14:25:36 -0400
From: Dan CaJacob <[email protected]>
To: "Marcus D. Leech" <[email protected]>
Cc: USRP List <[email protected]>
Subject: Re: [USRP-users] The receiver ADC goes into saturation
Message-ID:
<CAMOmJOCG4gQaySvdF8KGhqU=fpvrqy2yenmjslje4kbmz4j...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Everything The Marci said.
Specifically,
1. Reduce your TX amplitude to a maximum of 0.2, which should guarantee
linearity across many modulation types.
2. Reduce your TX gain to 0. (You could even go a bit negative on some
daughtercards, I do sometimes)
3. Reduce your RX gain to 0.
If you have test equipment, you can now check the OTA (over the air) power
of the TXsignal nearby with an antenna.
I assume that you are using an antenna for both the TX and RX sides and
that the units are a decent distance apart to avoid damaging the front end
of the RX with too much power.
If your RX side is not working, incrementally increase the RX gain until it
does. If you reach the maximum RX gain and it still doesn't work, only
then try increasing your TX gain.
Very Respectfully,
Dan CaJacob
On Sat, Oct 25, 2014 at 10:35 AM, Marcus D. Leech via USRP-users <
[email protected]> wrote:
> On 10/25/2014 08:28 AM, w xd via USRP-users wrote:
>
> Hi all:
> Environment:USRP N210,14bit ADC
> According the formula:DR(dynamic range):6.02*14=84.28dB.
> And now two USRP N210 close to each other,while one is used for
> transmitting and the other is used for receiving.The amplitude of the signal
> which to be send is 1.The gain in the transmitter I set 31.5dB.And the gain
> in the receiver I set also 31.5dB.The 31.5dB*2=63<DR(dynamic range).Why the
> receiver goes in saturation so easily?The signal saturates the ADC and gets
> clipped.Can someone explain it to me?
> Thank you.
> Best regards,
> xd
>
>
>
> _______________________________________________
> USRP-users mailing
> [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
> To use a simple physical world analogy, you're *screaming loudly* into
> your friends ear, and wondering why they have gone temporarily deaf...
>
> Reduce your TX power and/or RX gain.
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20141025/6b7e7155/attachment-0001.html>
------------------------------
Message: 2
Date: Sat, 25 Oct 2014 21:47:41 +0200
From: Marcus M?ller <[email protected]>
To: Dan CaJacob <[email protected]>,"Marcus D. Leech"
<[email protected]>
Cc: USRP List <[email protected]>
Subject: Re: [USRP-users] The receiver ADC goes into saturation
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
Hi Dan,
On October 25, 2014 8:25:36 PM CEST, Dan CaJacob via USRP-users
<[email protected]> wrote:
>Everything The Marci said.
The Marci with a capital M and a capital T. I suddenly feel meaningful :)
We're going to need a logo and a motto.
Cheers,
Marcus The Less Experienced
>
>Specifically,
>
>1. Reduce your TX amplitude to a maximum of 0.2, which should guarantee
>linearity across many modulation types.
>2. Reduce your TX gain to 0. (You could even go a bit negative on some
>daughtercards, I do sometimes)
>3. Reduce your RX gain to 0.
>
>If you have test equipment, you can now check the OTA (over the air)
>power
>of the TXsignal nearby with an antenna.
>
>I assume that you are using an antenna for both the TX and RX sides and
>that the units are a decent distance apart to avoid damaging the front
>end
>of the RX with too much power.
>
>If your RX side is not working, incrementally increase the RX gain
>until it
>does. If you reach the maximum RX gain and it still doesn't work, only
>then try increasing your TX gain.
>
>Very Respectfully,
>
>Dan CaJacob
>
>On Sat, Oct 25, 2014 at 10:35 AM, Marcus D. Leech via USRP-users <
>[email protected]> wrote:
>
>> On 10/25/2014 08:28 AM, w xd via USRP-users wrote:
>>
>> Hi all:
>> Environment:USRP N210,14bit ADC
>> According the formula:DR(dynamic range):6.02*14=84.28dB.
>> And now two USRP N210 close to each other,while one is used
>for transmitting and the other is used for receiving.The amplitude of
>the signal which to be send is 1.The gain in the transmitter I set
>31.5dB.And the gain in the receiver I set also 31.5dB.The
>31.5dB*2=63<DR(dynamic range).Why the receiver goes in saturation so
>easily?The signal saturates the ADC and gets clipped.Can someone
>explain it to me?
>> Thank you.
>> Best regards,
>> xd
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing
>[email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>> To use a simple physical world analogy, you're *screaming loudly*
>into
>> your friends ear, and wondering why they have gone temporarily
>deaf...
>>
>> Reduce your TX power and/or RX gain.
>>
>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>
>
>------------------------------------------------------------------------
>
>_______________________________________________
>USRP-users mailing list
>[email protected]
>http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
------------------------------
Message: 3
Date: Sat, 25 Oct 2014 16:46:05 -0400
From: "Marcus D. Leech" <[email protected]>
To: Marcus M?ller <[email protected]>, Dan CaJacob
<[email protected]>
Cc: USRP List <[email protected]>
Subject: Re: [USRP-users] The receiver ADC goes into saturation
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 10/25/2014 03:47 PM, Marcus M?ller wrote:
> Hi Dan,
>
> On October 25, 2014 8:25:36 PM CEST, Dan CaJacob via USRP-users
> <[email protected]> wrote:
>> Everything The Marci said.
> The Marci with a capital M and a capital T. I suddenly feel meaningful :)
> We're going to need a logo and a motto.
>
> Cheers,
> Marcus The Less Experienced
This either needs to be handled by George Lucas ("Return of the
Marci"), or a renaissance painter ("The Beatification of the Marci").
>
>> Specifically,
>>
>> 1. Reduce your TX amplitude to a maximum of 0.2, which should guarantee
>> linearity across many modulation types.
>> 2. Reduce your TX gain to 0. (You could even go a bit negative on some
>> daughtercards, I do sometimes)
>> 3. Reduce your RX gain to 0.
>>
>> If you have test equipment, you can now check the OTA (over the air)
>> power
>> of the TXsignal nearby with an antenna.
>>
>> I assume that you are using an antenna for both the TX and RX sides and
>> that the units are a decent distance apart to avoid damaging the front
>> end
>> of the RX with too much power.
>>
>> If your RX side is not working, incrementally increase the RX gain
>> until it
>> does. If you reach the maximum RX gain and it still doesn't work, only
>> then try increasing your TX gain.
>>
>> Very Respectfully,
>>
>> Dan CaJacob
>>
>> On Sat, Oct 25, 2014 at 10:35 AM, Marcus D. Leech via USRP-users <
>> [email protected]> wrote:
>>
>>> On 10/25/2014 08:28 AM, w xd via USRP-users wrote:
>>>
>>> Hi all:
>>> Environment:USRP N210,14bit ADC
>>> According the formula:DR(dynamic range):6.02*14=84.28dB.
>>> And now two USRP N210 close to each other,while one is used
>> for transmitting and the other is used for receiving.The amplitude of
>> the signal which to be send is 1.The gain in the transmitter I set
>> 31.5dB.And the gain in the receiver I set also 31.5dB.The
>> 31.5dB*2=63<DR(dynamic range).Why the receiver goes in saturation so
>> easily?The signal saturates the ADC and gets clipped.Can someone
>> explain it to me?
>>> Thank you.
>>> Best regards,
>>> xd
>>>
>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing
>> [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>> To use a simple physical world analogy, you're *screaming loudly*
>> into
>>> your friends ear, and wondering why they have gone temporarily
>> deaf...
>>> Reduce your TX power and/or RX gain.
>>>
>>>
>>>
>>> _______________________________________________
>>> USRP-users mailing list
>>> [email protected]
>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>>
>>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
Message: 4
Date: Sat, 25 Oct 2014 22:13:52 +0100
From: Daniel Malafaia <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] B200 - Spurs at the frequency domain
Message-ID:
<cadglnewlfhkznsr8hjxypt+c7yjgqpqcnmyf80hk1tgk9ok...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi all,
I'm analyzing the B200 and I found out that the frequency response have
some high power spurs.
In annex I'm sending an example. In this example the data was gather at a
Fc=161MHz, Fa=(5+1/3)MHz with a 36.5 gain and with the B200 closed at a
Faraday cage with no external sources of noise and with the connected
laptop covered in aluminium.
In this situation there's a visible spur at 160MHz, does someone knows
what the source may be?
Best Regards,
Daniel Malafaia
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20141025/92055b75/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 161.png
Type: image/png
Size: 590367 bytes
Desc: not available
URL:
<http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20141025/92055b75/attachment-0001.png>
------------------------------
Subject: Digest Footer
_______________________________________________
USRP-users mailing list
[email protected]
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
------------------------------
End of USRP-users Digest, Vol 50, Issue 26
******************************************
