Nice job!!
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of C. Turner
Sent: 13 February 2012 21:03
To: time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A's suitability for use as a 10 MHz
reference for microwave transverters
Last
Last week I noted that the FE-5680A's barefoot output was found to NOT
be a suitable 10 MHz reference for microwave transverters.
Specifically, I tested it on two different 10 GHz transverters and found
there to be objectionable levels of grunge on signals caused by
low-level phase modulation
Clint a good read and a fine approach.
By accident I looked at the original filter schematic first and believe it
has an error for the first output amplifier. The 470 ohm resistors in the
wrong location.
Others on the list have mentioned the same thing about the 5680s output
being dirty. You have
paul swed wrote:
Clint a good read and a fine approach.
If and only if the high phase noise pedestal exhibited by the buffer
amplifier that extends to offsets of a few hundred kHz or so isn't an issue.
The relatively low isolation between the 10MHz outputs may also be an issue.
By
Hi
Indeed the phase noise goes up by 20 log N when multiplying. To be precise,
only the phase spurs go up by 20 log N. If they are incoherent they still
multiply, but you get a bit of an offset.
Bob
On Feb 9, 2012, at 2:03 AM, Javier Herrero wrote:
El 09/02/2012 01:40, Bob Camp escribió:
Hi
Hi
Here is a little more on how much of a problem you have.
If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log
N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to
be down at -130 dbc to make it at 10 GHz.
If you want noise over 10 KHz to
El 09/02/2012 01:40, Bob Camp escribió:
Hi
Here is a little more on how much of a problem you have.
If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log
N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to
be down at -130 dbc to make it at 10
Hello,
As has been mentioned here before, the output of the non-tunable
FE-5680A's has been noted to have low-level spurs in it - no doubt due
to the way the various frequency loops are derived within, some using
DDS techniques. It is for this reason that when I packaged my FE-5680A
in its
Hi
The phase noise of the FE's is not great, even inside +/- 3 KHz. To do an
adequate job of cleaning them up, something like a 1 Hz loop bandwidth PLL
would be needed.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of C. Turner
I am just finishing my promised stability and phase noise measurements
on a batch of inexpensive Rb standards; I hope to publish the results
tomorrow evening.
In the meantime, I've looked at two of the FE-5680s and their phase
noise is significantly worse than either the Efratom FRS or the
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