I used one of the BC620AT cards many years ago with a DOS system. All
we needed was time within a second so we used with a Bancomm-supplied
DOS driver (I think) that replaced the system clock with IRIG-B based
time instead of the PC clock. It may have come with a regular driver
but I can't re
FWIW, The Win 2000 driver will work on Win XP.
John, K1AE
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jason T
Sent: Thursday, May 12, 2016 8:27 PM
To: time-nuts@febo.com
Subject: [time-nuts] Intro and Driver Request
Hello Time-Nuts - I've ended up
HP 5065A Environmental sensitivity
First here is a comparison between the specified sensitivities of various
Rubidium units.
Barometric per mbar Temperature per degree C
HP 5065A6.3X10-14 1.6X10-12
M100 FRK 8.7x10-1
Hello Time-Nuts - I've ended up here by way of the ham radio,
electronics and classic computing hobbies, which I'd bet is a common
trail to follow for time-standard collectors. I don't have any exotic
equipment at the moment but I've run across GPS and rubidium-based
test equipment online and at h
Hi
So, now that the *is* an alternative to ‘125 buffers … What do you need?
You can string enough inverters in series to hit any isolation spec. They are
cheap and easy
to string together. The question is: how good are they? You do a sine to square
conversion
and then split the digital signal
I've put some info about the TNS-BUF isolation amplifier at:
http://febo.com/pages/TNS-BUF/
I'll work on adding to this page as I can, and in the next few days will
post some information to the list about how we'll put a group order
together.
John
_
Gerhard,
If anyone has them they will be here on Time-nuts. But that said the ovens
are not that hard to reverse engineer. Especially when the heater doesn't
heat. So you may be able to figure out whats up.
Dive in as they say nothing to loose and an education to gain.
Good luck and keep us updated
Hi,
I won a FEI 1000A oscillator here on local ebay, but it turned out that
the heater does not work anymore. It oscillated, but drew only 30 mA
or so instead of ?600 mA in the heatup phase.
It was taken back, but the seller who inherited these things is a ham, too,
and he would like to dissect a
Some info on Cady
http://www.ieee-uffc.org/main/memorial-cady.asp
https://en.wikipedia.org/wiki/Walter_Guyton_Cady
http://ethw.org/Walter_G._Cady
http://amhistory.si.edu/archives/AC0046.pdf
On Thu, May 12, 2016 at 9:03 AM, Pete Lancashire
wrote:
> Congratulations
>
> -pete
>
> On Thu, May
Congratulations
-pete
On Thu, May 12, 2016 at 4:43 AM, Bernd Neubig wrote:
> Thank you for the congratulations.
> I am very pleased to have received this prestigious award named after Walter
> G. Cady, the guy who has built the first crystal oscillator in 1921.
>
> Bernd Neubig
>
> -Ursprün
Bruce wrote:
> For even lower flicker noise using a mixer assembled using
> 2NA's as diodes is even quieter as NIST have shown.
Note that mixers built with 2Ns only have lower noise than good schottky
DBMs below about 200 Hz -- above that, schottky DBMs are better (see Figures 4
and
Hi Belinda,
On 05/06/2016 03:34 AM, BJ wrote:
Hi Time Nuts,
I'm fairly new to the fascinating world of time and frequency, so I
apologise profusely in advance for my blatant ignorance.
We have all been there, so don't worry about it!
Your questions is actually really relevant and you've done
Thank you for the congratulations.
I am very pleased to have received this prestigious award named after Walter G.
Cady, the guy who has built the first crystal oscillator in 1921.
Bernd Neubig
-Ursprüngliche Nachricht-
Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von
Bill,
On 05/06/2016 06:22 AM, wb6bnq wrote:
Hello Belinda,
First off there is no such thing as accuracy, in and of itself. I know
many people on this list will call me on that, but accuracy requires a
point of reference. With regard to frequency that reference point has
been defined by some W
Hi
The offset oscillator in a DMTD needs to be uncorrelated with the devices under
test. If
it correlates with one or the other input, you have a single mixer system.
That’s fine, just
don’t bother with all the extra parts. A better way is to just grab a random
OCXO and ground
the EFC. That gi
Hi
Probably the simplest limiter that works at all is one based on a couple of op
amps. You
need the active filter function (high pass + low pass) in front of the limiter.
You also might
as well amplify the signal up to a significant peak to peak without limiting.
That gets you
the fastest ed
I don't mean to hijack the thread, but may be able to avoid Bob having
to reinvent the wheel. A few years ago I built up the PCB for a high
isolation, low noise buffer amp based on a design by Bruce Griffiths.
The board is all set for production; I just ran out of time.
The "TNS-BUF" works ex
On Thu, 12 May 2016 05:51:50 + (UTC)
Bruce Griffiths wrote:
> The input noise of a 125 series gate will be far larger than the noise at the
> mixer output at the beat frequency. A 125 may be useful as the output stage
> of a Collins style limiter chain wherein which the gain and bandwidth o
The phase noise and spurs of the common offset oscillator do not cancel
completely since the zero crossings of both channels do not occur at exactly
the same time.http://cdn.intechopen.com/pdfs-wm/24305.pdf
an the papers by Greenhall address this issue.
Bruce
On Thursday, 12 May 2016 5:51 P
The input noise of a 125 series gate will be far larger than the noise at the
mixer output at the beat frequency. A 125 may be useful as the output stage of
a Collins style limiter chain wherein which the gain and bandwidth of each
successive stage increases in a way that ensures that the output
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