Re: [time-nuts] HP5065A C-field mods and optical unit mods --> OFF LIST !!!

Hi So, when do they go up for sale? :) ( = If and when they do, I’m still shopping for one) Bob > On Nov 16, 2017, at 3:58 PM, wrote: > > HP5065A C-field mods and optical unit mods > > In addition to the power supply mods: > -removed AC components > -power now supplied with an external DC l

[time-nuts] HP5065A C-field mods and optical unit mods

HP5065A C-field mods and optical unit mods In addition to the power supply mods: -removed AC components -power now supplied with an external DC lab grade low noise highly regulated supply. -temperature coefficient of +20 Volt supply adjusted to be below 1PPM/deg C See: https://www.febo.com/pip

Re: [time-nuts] Interpreting and Understanding Allen DeviationResults

Jerry: > For time interval as discussed below, the unaltered GPSDO output goes to A and > how do you create the GPSDO delay for B without a physical coax delay? You are correct. In Randal's hp 5335A frequency counter experiment he was splitting a single GPSDO 10 MHz output to both the REF input a

Re: [time-nuts] Deaf Z3801

However, setting it to 23:59:59 Dec 12,2007 and leaving t alone for an hour or two seems to have done the trick. Thanks folks! Off to look at adev/pn of the $7 GPS boards I found with 10MHz out. Plots soon. Bob On Thu, Nov 16, 2017 at 12:26 PM, Bob Bownes wrote: > Yup. tried that too. > > The

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

If you have only one GPSDO, a coaxial cable is your best friend to test the performance of the counter in time-interval mode. If you have two GPSDOs, the Segal's law apply: , better go directly for three. On Thu, Nov 16, 2017 at 7:18 PM, Bob kb8tq wrot

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

Hi The exact software command used depends on the GPSDO you have. How you send the command to the GPSDO depends a bit on the driver software you are running. Not all GPSDO’s or modules have cable delay. All the ones I run do have the feature. Normally it comes set to some random default setti

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

Bob, I am also a time newbie... how do you adjust this in software? For time interval as discussed below, the unaltered GPSDO output goes to A and how do you create the GPSDO delay for B without a physical coax delay? Any change in GPSDO cable delay setting will affect A and B the same. Sorr

Re: [time-nuts] Deaf Z3801

Yup. tried that too. The system won't let me set the date after 23:59:59 Dec 12,2007 On Thu, Nov 16, 2017 at 11:42 AM, Bob kb8tq wrote: > Hi > > One thing that has faked me out on SCPI - they cache error messages. You > have to dump them all before you try something. > > Bob > > > On Nov 16,

Re: [time-nuts] Deaf Z3801

Hi One thing that has faked me out on SCPI - they cache error messages. You have to dump them all before you try something. Bob > On Nov 16, 2017, at 11:24 AM, Bob Bownes wrote: > > Thanks John. > > When I do this, I get the E-222 error indicating 'Data out of range'. > > Tried several for

Re: [time-nuts] Deaf Z3801

Thanks John. When I do this, I get the E-222 error indicating 'Data out of range'. Tried several formats, trailing';', etc. Here's what I get: scpi > :GPS:INIT:DATE 2017,11,16 E-222> :GPS:INIT:DATE 17,11,16 E-222> :GPS:INIT:DATE 17,01,01 E-222> :GPS:INIT:DATE 2017,01,01 E-222> :GPS:INIT:DATE 201

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

Hi Yes, that’s exactly what I’m saying. You just use the software rather than dragging around a big hunk of coax. It makes it easy to get one pps into the “that’s way more than I need” range. With the coax approach, is 50NS enough? Might 100NS be needed? Is there a 231NS case?. I’ve spent a *l

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

Bob, Do you mean then you do not need to put a physical long length of cable for the delay, just do it in software or do you do both? Jerry, NY2KW -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq Sent: Thursday, November 16, 2017 9:58 AM To:

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

Hi One “cute” thing to do when looking at GPSDO’s or GPS modules is to use the “cable delay” setting. It will allow you to move the pps of one unit relative to the pps of the other one. You then can be sure of which pps happens first. That makes the A to B measurement much easier to analyze.

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

As already stated here, the best measurement mode is the time-interval mode. The 5335A is a 2ns single-shot resolution counter. Use the PPS output from the GPSDO, route it to the A (start) input and to a coaxial cable used as a delay line (10m, 50ns, should be enough). The other end of the cable in

Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Just to close this one out, I was able to get the Ref-0 and Ref-1 working standalone with 10Mhz on both using my spare Motorola UT+ GPS. Lots of help from lots of people and especially Peter Garde who stuck with me to the end. It would be nice if all this was in one place or maybe one combined