Re: [time-nuts] PCB for frequency dividers

It can be about matched at www.sunstone.com Current Quote for 4-Layer Quickturn Boards http://www.sunstone.com/images/Question.gif javascript:__doPostBack('ctl00$ctl00$ctl00$cphSite$cphLayout$cphMain$lbUplo ad','') Upload Files | Print this Quote Print this Quote Build Time:

Re: [time-nuts] PCB for frequency dividers

Currently I have requests for 5 boards. The pricing I gave earlier (based on an order qty of ten) didn't include the tax I have to pay or the shipping to me. Pricing will be about USD70 each plus shipping if I get no further requests. The more interest the lower the price of course. If I can

Re: [time-nuts] PCB for frequency dividers

David C. Partridge said the following on 07/25/2008 12:17 PM: BTW Someone suggested that this might be relevant to TAPR. I'm very happy to grant TAPR the free (no charge) use of the design, conditional only on my retaining copyright. TAPR's Time and Frequency Design Team (i.e., me) is

[time-nuts] 5061A S/N ratio, EM voltage questions

Can someone provide a sanity check on my S/N and FOM measurements? I've used the procedure in my manual, but there is one rather vague calculation involving 2.3 e 13 x V403b. I assume this is actually 2.3 e -13 x (noise voltage in mv), because otherwise the other calculations result in absurd

Re: [time-nuts] PCB for frequency dividers

John, Read the license - seems appropriate to me. Happy to talk further, let's take this off list. Please use my email david dot partridge at dsl dot pipex dot com I'll be away over the w/e so don't expect a prompt reply ... Cheers Dave -Original Message- From: [EMAIL PROTECTED]

[time-nuts] LPRO 101 ADJUSTMENT

Hi, I recently acquired a LPRO 101 Rubidium Oscillator. After reading the manual I see that there are two ways to adjust the frequency 1) using and adjusting screw on the unit and 2) using the External C-field control signal at pin J1-7. Has anyone experimented with either method and if so

Re: [time-nuts] LPRO 101 ADJUSTMENT

Hi Jeff, if you read the manual you will see (there is a partial circuit diagram) that the external voltage trim is added to the voltage on the internal trim-pot, so both adjustments have the same effect. I was thinking of using an 8bit DAC to put a very small correcting voltage on the

Re: [time-nuts] LPRO 101 ADJUSTMENT

Both methods work well. Be sure the unit is mounted to some sort of heatsink,chassis, etc. I'm using a Fury GPS receiver to drive the EFC on an LPRO-101. You won't get much range out of either adjustment. Leave it powered on for a couple of hours before trying to adjust it. I usually set the

Re: [time-nuts] LPRO 101 ADJUSTMENT

If I choose to control the frequency via External C-field control I guess it would take a very precise and stable voltage source. Any thoughts or suggestions? - Original Message - From: Scott Mace [EMAIL PROTECTED] To: jshank [EMAIL PROTECTED]; Discussion of precise time and

Re: [time-nuts] LPRO 101 ADJUSTMENT

jshank wrote: If I choose to control the frequency via External C-field control I guess it would take a very precise and stable voltage source. Any thoughts or suggestions? 1) Quantify quiet and stable. Otherwise you'll either get suggestions that are inexpensive with inadequate

Re: [time-nuts] LPRO 101 ADJUSTMENT

Here's an idea of what the DAC on my system is doing: timestamp freq_err time_int efc_voltage 54672 85907.015 2.18e-12 -5.00e-10 1.976955 54672 85917.015 1.87e-12 -4.10e-10 1.976116 54672 85927.015 1.96e-12 -3.00e-10 1.975772 54672 85937.016 1.49e-12 -1.90e-10 1.975664 54672 85947.017

Re: [time-nuts] LPRO 101 ADJUSTMENT

jshank wrote: If I choose to control the frequency via External C-field control I guess it would take a very precise and stable voltage source. Any thoughts or suggestions? The range of adjustment for a typical Datum/Efratom rubidium standard is only a few parts in1E9. Thus to achieve a