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Today's Topics:
1. 12V to 6V Converter for USRP Supply (Radio User)
2. Re: questions about the antenna LP0965 (Qifanski)
3. sync across hosts/programs (Qifanski)
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Message: 1
Date: Sat, 16 Feb 2013 19:07:31 -0500
From: Radio User <[email protected]>
To: [email protected]
Subject: [USRP-users] 12V to 6V Converter for USRP Supply
Message-ID:
<ca+rmjihffvxq1zi7jz3crd876b8vmv0j6altnxqv+y0jjyg...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I use my USRP in the field with a deep cycle marine battery.
All the other equipment runs at 12V DC, and until now I've
had to plug the USRP's wall wart into a small 120V AC inverter.
I've been looking for a DC to DC converter to replace the wall wart,
and found one recently.
Vicor/PICOR makes a switching regulator and an evaluation board
that provides a pretty reasonable 12V to 6V DC to DC converter
that can supply up to 10A to the load. (see
http://cdn.vicorpower.com/documents/datasheets/Picor/ds_pi33xx.pdf )
The PI3302-00-EVAL1 is available for $50.51 from Digikey, and
may be available elsewhere for less.
The standard configuration of the P13302-00-EVAL1 produces
5V at the output. By putting a 4700 ohm resistor in the RADJ2
position (between the ADJ pin and the SGND pin) the output
changes to 6V. Regulation appears to be good, and I've been
testing this for about a week.
I added the optional input decoupling (about 80uF) on the
12V line to provide a little more input stability. The spec for
the device says that it will maintain regulation down to 11V
input at no load, and may work at lower inputs provided
sufficient load on the output.
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Message: 2
Date: Sat, 16 Feb 2013 17:10:50 -0800
From: Qifanski <[email protected]>
To: Matt Ettus <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] questions about the antenna LP0965
Message-ID:
<capvg14bn1++zxpyox9-r9qc7duzjgguyh-aw0em5m_kdwad...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
I'm also interested in knowing the the datasets about the directionality of
this antenna.
Where can I get it?
Thanks,
Qifan
On Wed, Feb 13, 2013 at 11:07 AM, Matt Ettus <[email protected]> wrote:
>
> The datasheet for that antenna is here:
>
> http://www.wa5vjb.com/pcb-pdfs/LP8565.pdf
>
> If you need further info on it, Kent would be the people to ask.
>
> Matt
>
>
> On Wed, Feb 6, 2013 at 7:38 PM, gang li <[email protected]> wrote:
>
>> Hi, guys,
>>
>> I have some questions about the antenna LP0965 purchased fromEttus. I
>> know it is made by Kent Electronics. Should i contact Kent or
>> justEttus? Thanks.
>>
>> Best,
>> Gang
>>
>> _______________________________________________
>> USRP-users mailing list
>> [email protected]
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>
>
> _______________________________________________
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>
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Message: 3
Date: Sat, 16 Feb 2013 17:23:33 -0800
From: Qifanski <[email protected]>
To: [email protected]
Subject: [USRP-users] sync across hosts/programs
Message-ID:
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Content-Type: text/plain; charset="iso-8859-1"
Hi,
I have a configuration like this and want to phase sync all the USRP N210s
here:
1) all USRPs are connected to the clock with 1pps and 20Mhz ref.
2) USRPs are connected to different desktops, programs are running
independently on these desktops.
If I want to create a MIMO node out of these USRPs (phase synced), by my
understanding, I could block all the programs at somewhere and let the
USRPs wait for the 1 pps signal. As long as the time points these USRPs
start to wait for the pps vary within 1 second, they should be synced,
right?
If so, is before
uhd::usrp::multi_usrp::set_time_unknown_pps<http://files.ettus.com/uhd_docs/doxygen/html/classuhd_1_1usrp_1_1multi__usrp.html#a413014bf3aea4a8ea2d268b4a3b390e9>
the
place I should block all the programs and let them wait for a control
signal (through socket maybe) ?
Do I need to sync again before send() and recv()?
Thanks,
Qski
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