Re: [Discuss-gnuradio] Reference Clock power level for Ettus N210

[Matt Ettus]

We posted those numbers because they are the numbers we know will work reliably.  -15dBm is unlikely to work well, but you won't damage anything by trying.

Matt

On Wed, Apr 23, 2014 at 3:43 PM, Antonio Petrolino <address@hidden> wrote:

Thank you Marcus,
I will wait for some answers from address@hidden before proceeding.

Best regards,
Antonio

On 04/23/2014 03:31 PM, Marcus Müller wrote:

Hi,
looking at the N200 schematics from files.ettus.com, I'd say:
stick to the 0dBm, your clock signal has to pass a transformer and some
safety/matching circuitry and still ought to be more accurate than the
on-board VCTCXO; the clock multiplexer
(http://www.micrel.com/index.php/en/products/clock-timing/clock-data-distribution/multiplexers/article/29-sy89545l.html)
datasheet says it needs at least a voltage swing of 0.1V after that.
I'm not very much of a circuits person, but I think you won't
deteriorate much of your clock accuracy by using a clock buffer, which
are quite inexpensive (if you need but one and are not afraid to
solder... TI gives away samples for free).
Then again, you're trying to achieve a better clock performance than the
on-board 10MHz ref clock, so I guess you shouldn't start introducing
cheap hardware in the clock signal path...

Greetings,
Marcus

PS: maybe the address@hidden mailing list is better suited
for this... I've added that to CC:

On 04/23/2014 03:07 PM, Antonio Petrolino wrote:

Hi,

I'm using a USRP N210 and I need a 10 MHz reference clock. From
ettus.com I got:

"
Ref Clock - 10 MHz

Using an external 10 MHz reference clock, a square wave will offer the
best phase noise performance, but a sinusoid is acceptable. The
reference clock requires the following power level:

USRP2 5 to 15 dBm
N2XX 0 to 15 dBm
"

So in my case (N210) I should have a minimum 0 dBm signal.
Can someone confirm this information (N2XX 0 to 15 dBm) for N210? The
bad news for me is I have a -15dBm 10 MHz available...

Thank you,
Antonio

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