From jimr@maia.usno.navy.mil Thu Jul 5 08:48:14 EDT 2001
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From: Jim Ray (USNO 202-762-1444)
Message-Id: <200107051245.IAA03417@maia.usno.navy.mil>
Subject: [GPST] Re: 5 MHz -> 20 MHz multiplier ?
To: gpst@maia.usno.navy.mil
Date: Thu, 05 Jul 2001 8:45:27 EDT
X-Mailer: Elm [revision: 212.5]
Status: RO
FYI, in response to the question:
Date: Tue, 3 Jul 2001 10:21:35 -0600 (MDT)
From: Kristine Larson
Subject: [GPST] 5 MHz -> 20 MHz multiplier ?
Hello.
We are starting an experiment here at
the University of Colorado and plan
to install an Ashtech Z12-T in Boulder for comparisons
with other Z12-T's. We need a frequency multiplier
to convert from 5 MHz to 20 MHz, and wondered if any
of you could recommend a model and/or reliable supplier.
Thanks,
Kristine Larson
kristine.larson@colorado.edu
the following suggestions have been sent:
1. Date: Tue, 3 Jul 2001 13:18:33 -0700
From: "Christopher R. Ekstrom"
Hello,
I would reccomend getting a module from SpectraDynamics
(www.spectradynamics.com). This is a small company run by Franklin Ascrunz
(spelling?) in Boulder. Franklin used to work with Fred Walls at NIST.
I am using his products and can attest to the excelent perforance of
multipliers from 5 to 100 MHz. These systems do not impact clock
performance at the 1e-13 (at one second) level. His multipliers and
distribution amplifiers do tend to use a fair amount of power.
I hope this helps,
Chris
------------------------------------------------------------------------
Christopher R. Ekstrom
USNO - Time Service/Clock Development
3450 Massachusetts Ave. NW
Washington, D.C. 20392
(202) 762-0066 (phone)
(202) 762-1421 (fax)
2. Date: Tue, 03 Jul 2001 15:38:26 -0400
From: Miranda Chin
CC: Shepherd Cofer ,
Kristine,
Hopefully the information from Shep Cofer is helpful to you.
Miranda
Shepherd Cofer wrote:
> Yes we do! The Wavetek 178 50Mhz Programmable Waveform Synthesizer
> will accept an external reference and produce an output of up to 50Mhz,
> with the stability of the input.
3. Date: Thu, 05 Jul 2001 09:24:26 +0000
From: Thomas Schildknecht
Hello Kristine,
We use a frequency multiplier made by the Swiss Fedeal Office of
Metrology (METAS) which is based on a design by LPTF Paris. You should
contact Gregor Dudle from METAS for the details
(Gregor.Dudle@eam.admin.ch).
Best regards,
Thomas
************************************************************************
Thomas Schildknecht eMail: thomas.schildknecht@aiub.unibe.ch
Astronomical Institute www: http://www.aiub.unibe.ch/
University of Berne
Sidlerstrasse 5 Phone: +41-31-631 85 94 (91)
CH-3012 Bern, Switzerland Fax: +41-31-631 38 69
************************************************************************
4. From: =?iso-8859-1?Q?G=E9rard_Petit?=
Date: Thu, 5 Jul 2001 13:54:10 +0200
Kristine,
Our 5 MHz to 20 MHz multiplier has been provided
(at a charge) by OFMET (now METAS) in Bern, the designers of the
GeTT station. Contact: Gregor.Dudle@metas.admin.ch
Best wishes,
Gérard
----------------------------------------------------------
Gerard Petit
Time section, BIPM
Address: Pavillon de Breteuil
92312 Sevres FRANCE
Phone: (33)1-45077067
FAX: (33)1-45077059
E-mail: gpetit@bipm.org (Gerard Petit)