> Microphonics.
>
> What's the norm here? I see it in the 2nd harmonic level on the panel
> meter. It runs about 20 normally, but a pretty light tap (with my
> fingernail) anywhere on the instrument can peg the meter for a few
> seconds. While I had the scope on A8 TP2 / TP3 (showing the off-re
Jim,
> Except...
>
> Microphonics.
>
> What's the norm here? I see it in the 2nd harmonic level on the panel
> meter. It runs about 20 normally, but a pretty light tap (with my
> fingernail) anywhere on the instrument can peg the meter for a few
> seconds. While I had the scope on A8 TP2 / TP3
Turns out there have really just been two major issues so far with this
new-to-me instrument. As I noted a few days back the pots on the A3
multiplier were intermittent, and twiddling them a bit got the instrument
to lock up.
But it was off by about 77E-10. The mag field control had no effect.
Its not too difficult to setup a low noise regenerative divider that will
produce a 10 Mhz output from a 15MHz input.
Bruce
On Friday, 11 December 2015 2:01 PM, Skip Withrow
wrote:
Hello Time-Nuts,
RDR Electronics has a limited supply of FEI FE-405B OCXO oscillators with
digital
> Hi all,
>
> A 5115A phase noise test set landed in our lab and I am wondering about the
> data collection.
> It has two telnet ports one for commands and one for phase data.
> When issuing "start" on the command-port it starts spitting out
> phase-difference values on the data port.
>
> However
Hello Time-Nuts,
RDR Electronics has a limited supply of FEI FE-405B OCXO oscillators with
digital frequency control available. These are very good crystal
oscillators that are generally BELOW 1x10E-12 from 1 to 1000 seconds (some
approaching a couple of parts in 10E-13). The mediocre ones ar
There is a gotcha in the TSC phase data... the architecture introduces a
deliberate phase offset to the phase data so you will always gain (or
lose) phase over time. Hook both inputs to the same source, and you'll
still have a slope in the output data (and the slope and intercept will
be diffe
Lucky you! The 5115A has a thousand times better resolution than a hp5370 or
SR620 counter.
The architecture of the 5110A 5115A and 5120A is described in the manuals.
These are frequency stability analyzers so the initial phase and frequency
offsets are not important. What you're seeing is phas
Hi all,
A 5115A phase noise test set landed in our lab and I am wondering about the
data collection.
It has two telnet ports one for commands and one for phase data.
When issuing "start" on the command-port it starts spitting out
phase-difference values on the data port.
However it seems to me th
In message <05ea571f-18cd-4046-b520-63f29a892...@n1k.org>, Bob Camp writes:
>> See also http://leapsecond.com/pages/fe405/ and the links near the bottom.
>> This (patented) FEI design avoids the spur issues several of you have been
>> talking about: the RF output comes from a low-noise
(ADEV of 4E-16 at tau of 1000 seconds is a typical state of the art requirement)
…. and has been since the 1970’s when I first started talking with JPL people
about this :)….
They've gotten a lot smaller and probably draw less power since then.
There's also the testing problem: proving tha
Hi Tom:
While I was working at TRW Microwave we were purchased by FEI. It's my understanding the their key capability was in
the crystal material in that it produced the cleanest oscillators on the market.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/201
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