I wonder, since you are emulating the crystal output, if the R820T would
ordinarily drive the crystal to rail-to-rail, square wave output. It might
be worthwhile using a high impedence probe to see what the signal you are
replacing looks like.
I say this because the elonics patent suggests that s
I use R820T. It has nonzero IF and the noise is relatively flat.
The clock looks sawtooth-like on the scope.
Juha
On 26.9.2013, at 18.32, Heath Hunnicutt wrote:
> Juha,
>
> Ordinarily, I would choose to feed a clock into xtal_in, this seems logical.
> However check out the Elonics patent:
>
On 09/26/2013 06:32 PM, Heath Hunnicutt wrote:
Juha,
Ordinarily, I would choose to feed a clock into xtal_in, this seems logical.
However check out the Elonics patent:
http://www.uspto.gov/web/patents/patog/week49/OG/html/1385-1/US08324978-20121204.html
The main thing to note is that square-wa
Bah!!! The main thing to note is that the e4000 expects a clock input on
XTAL_OUT. That's right, the patent says that out can be an in, for the
e4000. Sorry I made a post in which I made a thought mistake and typed the
opposite.
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Juha,
Ordinarily, I would choose to feed a clock into xtal_in, this seems logical.
However check out the Elonics patent:
http://www.uspto.gov/web/patents/patog/week49/OG/html/1385-1/US08324978-20121204.html
The main thing to note is that square-wave clock input should be fed to
xtal_in for the
Well, I certainly would be keen to hear your further reports on this.
One thing to consider is that if you're going to build a fan-out buffer, you might as well build a 28.8MHz source using one of the easily-available 14.4Mhz TCXOs that are "out there", and design
a doubler--this will give you a
Hi,
I modified my clock sharing so that I only insert a signal in the Xtal_In
pin of other dongle. This way I won't have two circuits driving the same
crystal, as Ian pointed out. The pin next to the edge of the dongle turned
out to be the Xtal_In pin (the input of the opamp on the slave dongle).
Hmmm, interesting.Was this with E4000 tuners, or R820T tuners?
What was your exact test setup, tuned-frequency, etc?
on Sep 25, 2013, Juha Vierinen wrote:
Hi guys,
Based on my very limited understanding on electronics, osclilators and other such things, I would expect oscillator effects
On 09/25/2013 12:04 AM, Jared Clements wrote:
Hi Marcus,
Interesting discussion. I was wondering how well synchronized clocking
might work. Was hoping it would work better than it sounds. Could
you quantify the level of phase noise you're seeing, like with a power
spectral density plot?
On 09/24/2013 04:57 PM, Ian Buckley wrote:
Marcus, (appreciate you may have done a lot more than your brief
description above, but just in case….)
The type of cheap 2 pin oscillator used with the Realtek chips will
be connected across an internal inverting buffer amplifier in the IC
with shun
On Sep 24, 2013, at 1:54 PM, Ian Buckley wrote:
> On Sep 24, 2013, at 11:41 AM, Marcus D. Leech wrote:
>
>> On 09/23/2013 10:59 AM, Juha Vierinen wrote:
>>>
>>> I was playing around with the rtl_sdr dongles and came up with a trivial
>>> hack to build a receiver with multiple coherent channe
On Sep 24, 2013, at 11:41 AM, Marcus D. Leech wrote:
> On 09/23/2013 10:59 AM, Juha Vierinen wrote:
>>
>> I was playing around with the rtl_sdr dongles and came up with a trivial
>> hack to build a receiver with multiple coherent channels. I do this
>> basically by unsoldering the quartz clock
On 09/23/2013 10:59 AM, Juha Vierinen wrote:
I was playing around with the rtl_sdr dongles and came up with a
trivial hack to build a receiver with multiple coherent channels. I do
this basically by unsoldering the quartz clock on the slave units and
cable the clock from the master rtl dongle t
I did a similar experiment with R820T based dongles using an external high
quality reference and a common signal source.
The results were poor with a lot of mutual phase noise between two dongles.
What sample rates did you try and was this E4000 or R820T tuners?
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