An off-topic from time to time is great, but a new email every minute
unrelated with time-nuts is a bit too much, didn't you think ?
Sorry, I don't want to be rude.
-Message d'origine-
De : time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] De la
part de Brent Gordon
Envoyé
Just a small question : According to your own setup, could you tell us what
is the minimum visible sky area needed to achieve a lock with a tbolt ? Does
it lock with a quarter (90°) of the sky visible, or even less ?
Thank you.
-
Samuel DEMEULEMEESTER
Presse Non Stop - Canard
Just to let you know I ordered from Bob (the well-known fluke.l on eBay)
what seems to be a small distribution amplifier. The PCB features 6 outputs
(2-sine, 4-square) with an external input (5-20 MHz), an integrated OCXO and
powered with +12V. Priced 68 USD or @ 50 USD without the OCXO. Don't
www.shipito.com
They shipped many, many parcels from the US to France for me. From
lightweight BNC adapter to old HP boat anchor (75+ lbs). Prices are really
low. I also use it when the seller only use expensive UPS service to ship
overseas.
But don't mess with identity verification procedure.
Another question about the TADD-2 PIC divider : they said on main page the
source code for the pic will be released in open source. Does anyone know if
the code is available somewhere ?
-Message d'origine-
De : time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] De la
part de
Hi there,
I'm working on a new GPS-Disciplined Rubidium Frequency Standard and I'm now
designing the distribution amplifier stage. There is many schematics
everywhere on the Internet, the most famous is the TADD-1 reviewed by the
not-less-famous TVB. Almost all of them use high-speed Op Amps
The slew rate seems a bit slow on AD8047 (750 V/µs VS 1100 V/µs). A great
(but expensive) AOP with really nice specs is the LT1227 from Linear. But
I'm not a time guru and perhaps there is some tricks that I'm not aware of.
For a distribution amplifier designed to share an accurate 10 MHz sine
The good output +/-9V or more as the spec requires.
According to the official RS232C specifications, the valid voltage range
must be between +/-3V and +/-15V (+/-25V for the first draft). A device that
absolutly require +/-9V is not RS232 compliant. BTW, as you said, some cheap
USB-Serial
Thanks for your answers.
About the components, I think my first prototype will use some very
well-known prescaler and amplifiers like Hittite HMC363 and Mini-circuits
ERA-1SM, only to validate the design. I will use a 100 MHz high-pass filter,
but overall, it will be a wide-band, low-sensitivity
If you download the 53132A component level information manual from the
Agilent site you'll find a schematic of the channel 3 board with values
and J2
pinout. The 53131A version of this manual doesn't seem to include this.
Excellent ! I only checked the 53131A datasheet without success.
You're right.
On the J2 connector, there is :
* Frequency output : Where the divided input frequency goes.
- Pin 2 on counter - Pin 6 on EXT_PCB
* CH3CODE0 CH3CODE1 : Used to detect the type of prescaler
- Pin 910 on counter - Pin 510 on EXT_PCB
- 1/1 on 12.4 GHz board - 0/0 on 3 GHz board
d'origine-
De : time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] De la
part de Samuel D. [x86/CPC]
Envoyé : dimanche 15 février 2009 22:05
À : 'Discussion of precise time and frequency measurement'
Objet : Re: [time-nuts] DIY Frequency extension for HP Agilent 53181A,
53131A or 53181A
Hi there,
First, let me introduce myself : I’m a 28-years-old electronic engineer working
for a press magazine as Hardware Test Chief Editor. I’m from France; so,
please forget about my bad English. Since years, I’m obsessed with precision
measurements and I spend the last 15 months finding
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