Thank you!
eric
On Fri, 22 Jun 2007, Roshan Baliga wrote:
You want the full schematics, which I believe are in the subversion
repository. You can get them with this command (once you've installed the
subversion client, of course):
svn co http://gnuradio.org/svn/usrp-hw/trunk usrp-hw
-Rosha
You want the full schematics, which I believe are in the subversion
repository. You can get them with this command (once you've installed
the subversion client, of course):
svn co http://gnuradio.org/svn/usrp-hw/trunk usrp-hw
-Roshan
[EMAIL PROTECTED] wrote:
I would like to see this schematic
I would like to see this schematic that Don mentions; I look at ettus.com
but all I could find is the 1-page basic description of the daughterboard.
Is there something more detailed that shows the layout of the 8132 as
well as the ADC?
thanks,
eric
p.s.- the USRP performed beautifully for my
Don Ward wrote:
> That's not what I get. With the input open, I measure 108 mV on the
> SMA connector and a DC component from the ADC (detected using the RSSI
> register, to avoid the DC offset filter in the FPGA). If I short the
> input to ground, I get a negative DC component from the ADC. To
- Original Message -
From: "Matt Ettus" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc:
Sent: Thursday, June 21, 2007 9:33 PM
Subject: Re: [Discuss-gnuradio] offset at input of LF_RX
[snipped]
Back to the subject of what your signal generator is doing,
On Fri, 22 Jun 2007, Matt Ettus wrote:
[EMAIL PROTECTED] wrote:
On Thu, 21 Jun 2007, Matt Ettus wrote:
If there is no dc-removing capacitor in the circuitry , then should I
not expect that for a board using a single (positive) supply, that the
signal is always above zero?
No, you can p
[EMAIL PROTECTED] wrote:
> On Thu, 21 Jun 2007, Matt Ettus wrote:
>
>>
>>>
>>> If there is no dc-removing capacitor in the circuitry , then should I
>>> not expect that for a board using a single (positive) supply, that the
>>> signal is always above zero?
>>>
>>
>>
>> No, you can put a negative vo
On Thu, 21 Jun 2007, Matt Ettus wrote:
If there is no dc-removing capacitor in the circuitry , then should I
not expect that for a board using a single (positive) supply, that the
signal is always above zero?
No, you can put a negative voltage in, as long as it doesn't go below
-3.33V.
>
> If there is no dc-removing capacitor in the circuitry , then should I
> not expect that for a board using a single (positive) supply, that the
> signal is always above zero?
>
No, you can put a negative voltage in, as long as it doesn't go below
-3.33V. You need to look at the schematics -
gnuradio.org appears to be down. Where can I find that flag, and how do I
disable it?
However, my surmise of the last post seems to be correct. When I
substitute a regular Basic RX for the LF RX unit, the upwards shift goes
away. This is I'm guessing because, as I hinted to in my previous p
On 6/21/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Is there a software flag in the code I can switch off? If so, where?
http://gnuradio.org/trac/wiki/UsrpFPGA
Under "Common Registers":
15 FR_DC_OFFSET_CL_EN DC offset control loop enable
Brian
__
On Thu, 21 Jun 2007, Matt Ettus wrote:
Oddly enough, usrp_oscope.py doesn't show any DC bias whatsoever,
regardless of what offset I put into the function generator. Maybe
it's removed inside the flow-graph?
DC offset is automatically removed in hardware, but you can turn that
feature off
On Thu, 21 Jun 2007, Matt Ettus wrote:
Oddly enough, usrp_oscope.py doesn't show any DC bias whatsoever,
regardless of what offset I put into the function generator. Maybe
it's removed inside the flow-graph?
DC offset is automatically removed in hardware, but you can turn that
feature off
>>
>>> Oddly enough, usrp_oscope.py doesn't show any DC bias whatsoever,
>>> regardless of what offset I put into the function generator. Maybe
>>> it's removed inside the flow-graph?
>>
>> DC offset is automatically removed in hardware, but you can turn that
>> feature off.
>>
> Can you explain
On Thu, 21 Jun 2007, Don Ward wrote:
- Original Message - From: <[EMAIL PROTECTED]>
To:
Sent: Thursday, June 21, 2007 5:22 PM
Subject: [Discuss-gnuradio] offset at input of LF_RX
Hi all-
can anybody explain why the USRP/ LF_RX would seem to introduce a DC bias
or offse
On Thu, 21 Jun 2007, Matt Ettus wrote:
[EMAIL PROTECTED] wrote:
Hi all-
can anybody explain why the USRP/ LF_RX would seem to introduce a DC
bias or offset to a signal generated by a function generator? I have
a function generator configured to produce a 1 kHz .1 V P-P signal
into a 50 Ohm lo
[EMAIL PROTECTED] wrote:
> Hi all-
>
> can anybody explain why the USRP/ LF_RX would seem to introduce a DC
> bias or offset to a signal generated by a function generator? I have
> a function generator configured to produce a 1 kHz .1 V P-P signal
> into a 50 Ohm load. I have a Lecroy digital osc
Hi all-
can anybody explain why the USRP/ LF_RX would seem to introduce a DC bias
or offset to a signal generated by a function generator? I have a
function generator configured to produce a 1 kHz .1 V P-P signal into a 50
Ohm load. I have a Lecroy digital oscilloscope configured with the in
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