Re: [time-nuts] Best Rubidium Frequency Standard

> Or, perhaps not. The two working TSD12s that I see on eBay (apparently > the same as the PRS-10 except the lock flag is set to 3 instead of 1 and > which can be reset) Would you elaborate on this? I Googled for TSD12 and except for the auction listings, found nothing. Joe

Re: [time-nuts] quartz thermometers

It may be that the need for that kind of resolution died out. The next step up from quartz thermometry is resistance thermometry. The linearization equation for platinum has enough terms to make it uncertain around .01 C. Temperature calibration baths usually use platinum resistance sensors. It

Re: [time-nuts] MTI 260-0624-D OCXO

> Hi > Anything electrical (duty cycle/ harmonics / output level / etc) > is designed in on a modern part done in high volume. > The only candidates for a pot on top of the oven are: > Inner oven temperature > Outer oven temperature > EFC > You have already ruled out EFC (it would be a

[time-nuts] quartz thermometers

Hi, I hope this is still relevant and not too off-topic...but since it involves crystals and tempco... Quartz thermometers (e.g. the HP 2804A) with their 'linear cut' crystals and '0.0001C resolution' seem to have been a thing from the mid-60's to the mid-80's:

Re: [time-nuts] Best Rubidium Frequency Standard

Bob, After all of the excellent feedback here, my current thinking is that I can get a parts / repair PRS-10 for somewhere near $150. There are several reasons that this might be the best option... 1. It appears to be about the best that I can afford from what I have seen of the testing

Re: [time-nuts] Rubidium Frequency Standard

Pete, I will be using it for a general lab standard, to feed into other test equipment. But, I can't predict my future usage, so I want the best that I can get. I also plan on eventually locking it to a GPS (probably a U-Blox board). I am retired, so my budget is nearly non-existent. :-) I have

Re: [time-nuts] Best Rubidium Frequency Standard

HI None of this is a simple slam dunk. The 5065 has great ADEV numbers. In “as delivered” condition It has horrid TC and pressure sensitivity. It also is > 10X more expensive than a lot of the other devices. The units that *can* be disciplined are rarely set up to do so properly off of a

Re: [time-nuts] PLL book 3rd edition

Why don't you look at the outline to determine what might be needed or missing . Ulrich In a message dated 3/11/2016 11:09:51 A.M. Eastern Standard Time, att...@kinali.ch writes: Hoi Ulrich, On Mon, 7 Mar 2016 19:52:58 -0500 KA2WEU--- via time-nuts wrote:

[time-nuts] Best Rubidium Frequency Standard

Mark's Law of Rubidium Goodness... the bigger the box, the better it is. The HP5065A is one of the best units ever made. It can rival a cesium beam unit. The X72 is a horrid little creature. I would also go with the M100 / FRK units. The LPRO an FE56xx units were designed for telecom use

Re: [time-nuts] Standard Room Calibration Procedure

Dear Luciano I run a T calibration laboratory. It sounds like what you're after is a Test Method (TM), which we use as part of our quality system. Any accredited calibration laboratory will have documents like this. They vary greatly in their detail according to the needs of each laboratory, and

Re: [time-nuts] Rubidium Frequency Standard

In message , cdel...@juno.com writes: >Luciano is correct. The HP 5065A beats all the others easily. There's one for sale on ebay.fr these days. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since

Re: [time-nuts] Rubidium Frequency Standard

Corby mentioned one very important thing .. what are you going to be using it for ? and I'll ask what is your budget ? That will determine quite a bit. -pete On Fri, Mar 11, 2016 at 11:02 AM, wrote: > Mike, > > Luciano is correct. The HP 5065A beats all the others easily. >

Re: [time-nuts] Best Rubidium Frequency Standard

I have been running an M100 for over 15 years. It was NOS when I purchased it for $300. Runs 24x7, and just keeps chugging along. Rob NC0B Sent from my iPad > On Mar 11, 2016, at 10:01 AM, "time...@metachaos.net" > wrote: > > > > Luciano, > > Why? Why the Efratom

[time-nuts] Rubidium Frequency Standard

Mike, Luciano is correct. The HP 5065A beats all the others easily. It is not configured however to be disciplined although it can be modified. It's main claim to fame is the excellent short term stability. If all you are after is a long term accuracy standard then any of the others would

[time-nuts] Symmetricom / Microsemi pcie-1000 PTP Clock Card

Hello, Recently I acquired Symmetricom / Microsemi pcie-1000 PTP Clock Card Here is the link to that product: http://www.microsemi.com/document-portal/doc_view/133454-syncpoint-pcie-1000-user-s-guide The Installation Instructions mention the Linux driver for it, which covered by GNU

Re: [time-nuts] Best Rubidium Frequency Standard

Luciano, Why? Why the Efratom FRK or M100 over the Efratom LPRO-101? The M100 appears to be manufactured in '91. Given the limited lifespan, why such an older choice? I didn't list the HP5065A because I didn't see it on eBay. What makes it better than the others? Why not one of the Symnmetricom

Re: [time-nuts] Best Rubidium Frequency Standard

I'd never heard of the SRS TSD-12 until I saw it on your list. It looks like a SRS PRS-10 with the connector in a different location but I don't know if they are close in performance or not. you might want to take a look at the PRS-10 anyhow since it appears to have excellent performance numbers;

Re: [time-nuts] Standard Room Calibration Procedure

As to calibration interval, you should look for example at page 3-2 of HP Manual 10811-90002, where they give general principles and then specific examples to find the "minimum calibration interval". This manual online at http://www.leapsecond.com/museum/10811a/10811a.pdf They also give several

Re: [time-nuts] Standard Room Calibration Procedure

Hi At least in my experience, such documents do not exist. What happens: 1) The unit is put on a calibration schedule (1 year) on an arbitrary basis 2) The tech is expected to read the manual for the device and calibrate it 3) Any deviation from cal is noted in generic documents Put another

Re: [time-nuts] Best Rubidium Frequency Standard

Hi Mike, You have not mentioned the best Rubidium available, the HP5065A. Last week two of them are sold on ebay. Second chose can be the Efratom FRK or M100, than all the others. Luciano On Fri 11/03/16 12:02 , time...@metachaos.net wrote: > Hi, > > In looking at eBay, I current see

[time-nuts] Best Rubidium Frequency Standard

Hi, In looking at eBay, I current see quite a few different types of rubidium frequency standards. I have seen some of these mentioned here, but no real comparisions. The question, is what are the pros and cons of these specific models? Which ones are best or most reliable? Which ones cannot be

[time-nuts] Standard Room Calibration Procedure

Hi all, Among the many experts and documentation available on the internet my question might seem trivial . I'm looking for a written document , not generic information, describing the procedure , timing and methods of calibration of one or more standard present in a laboratory frequency