Re: [time-nuts] Upgrading TS2100 from TCXO to OCXO

If you use the offset command, you can correct this bias but it will be at the cost of moving your hardware 1pps output off an equivalent amount in the opposite direction. Greg, that's understandable. I don't use the PPS output from these boxes so that isn't really a concern for me. Besides

Re: [time-nuts] GPSDO and Rb Oscillators Source

Re:  ~1- Hp Agilent 10811-60111 10MHZ Crystal Oscillator  Item number:  300542352716 Starting bid: US $75.00 or buy it now Price: US $100.00    Over the last 3 months I've been able to acquire two HP5328's shipped to more door in Canada for approx $100.00 or less with 10811's (and the C

[time-nuts] HG414A/CH1-78 report

Hi! Yesterday I managed to trim away the unwanted RF from the 5 MHz output. I fail to get as good result from the 10 MHz output, but I think it will not be as big impact. Will possibly need to handle that. Spectrum analyzer helps a lot more than a scope. Happy I invested in a faster analog

Re: [time-nuts] WWVB Measurements using DSP recovery

If I could suggest a shorter and perhaps simpler solution. Rather than reinventing the wheel, simply insert each value as read into a SQL database engine, there are numerous free ones available, i.e. MySQL or Postgresql. You could include a timestamp either with your code or the system can

Re: [time-nuts] HP 3586 entirely referenced to 10MHz: A solution II

Perry, The bad part of your solution, that you seem to be missing is the BFO will not be locked or referenced to any standard but itself. If that is acceptable to you, then there is no need to reference your 3586 to anything but itself rendering the entire subject void to you. The DDS

[time-nuts] T.I. experimenting - newbie question

I have a borrowed HP 5328A with the Universal Module. I'm using averaging mode and auto triggering. Counter does not have the OCXO option. I'm using the internal oscillator, not locking to my GPSDO. I was just messing around with a length of Belden 9273 and the 100 KHz square wave output from my

Re: [time-nuts] T.I. experimenting - newbie question

Joseph Gray wrote: I have a borrowed HP 5328A with the Universal Module. I'm using averaging mode and auto triggering. Counter does not have the OCXO option. I'm using the internal oscillator, not locking to my GPSDO. I was just messing around with a length of Belden 9273 and the 100 KHz square

Re: [time-nuts] T.I. experimenting - newbie question

Interesting followup. With the exact same setup, but replacing the tee with a Wenzel power divider, I get 18.6 ns. On Sat, Apr 2, 2011 at 7:42 PM, Joseph Gray jg...@zianet.com wrote: I have a borrowed HP 5328A with the Universal Module. I'm using averaging mode and auto triggering. Counter does

Re: [time-nuts] T.I. experimenting - newbie question

Bruce Griffiths wrote: Joseph Gray wrote: I have a borrowed HP 5328A with the Universal Module. I'm using averaging mode and auto triggering. Counter does not have the OCXO option. I'm using the internal oscillator, not locking to my GPSDO. I was just messing around with a length of Belden

Re: [time-nuts] T.I. experimenting - newbie question

Joseph Gray wrote: Interesting followup. With the exact same setup, but replacing the tee with a Wenzel power divider, I get 18.6 ns. Resistive or rf power divider? Using the latter may result in significant reflections. On Sat, Apr 2, 2011 at 7:42 PM, Joseph Grayjg...@zianet.com wrote:

Re: [time-nuts] T.I. experimenting - newbie question

Seems like you are asking where the reference plane of a BNC is. The distance between the reference planes defines the electrical length of a cable or adapter or L or T. Unlike precision connectors like the APC-7 or GR 900, the reference plane of a BNC is not well defined. A quick Google turned

Re: [time-nuts] T.I. experimenting - newbie question

On Sat, Apr 2, 2011 at 8:06 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: Resistive or rf power divider? Using the latter may result in significant reflections. RF divider. Perhaps I should make a resistive divider. Joe Gray W5JG ___

Re: [time-nuts] T.I. experimenting - newbie question

Thanks for the input. I'll try a bit more experimenting and see what I get. As for the measured cable length, do I include the BNC connectors or not? Joe Gray W5JG On Sat, Apr 2, 2011 at 8:03 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: Bruce Griffiths wrote: The measured delay

Re: [time-nuts] T.I. experimenting - newbie question

As for the measured cable length, do I include the BNC connectors or not? You want the difference in path lengths. Is there an asymmetry in the setup? If so, count the BNC connectors that don't have a match on the other path. If you have input-Tee-coax-Tee-terminator, then the difference is

Re: [time-nuts] T.I. experimenting - newbie question

I've always been partial to differential measurements. So many things fall out when you do the subtraction. Make short and long cables using the same wire and connectors. Measure the time delay for each. Subtract the short delay from the long delay to get Td. Subtract the length of the short

Re: [time-nuts] T.I. experimenting - newbie question

Yes, that is a better way of phrasing my question. If you are correct, then that would make about 14 mm difference in my measured length, which would bring me even closer to my calculated length. And the tee may also be adding to my error margin. Time for more experiments :-) Joe Gray W5JG On

Re: [time-nuts] HG414A/CH1-78 report

On 04/02/2011 06:53 PM, Magnus Danielson wrote: Hi! Yesterday I managed to trim away the unwanted RF from the 5 MHz output. I fail to get as good result from the 10 MHz output, but I think it will not be as big impact. Will possibly need to handle that. Spectrum analyzer helps a lot more than a

Re: [time-nuts] T.I. experimenting - newbie question

On 04/03/2011 04:03 AM, Bruce Griffiths wrote: Bruce Griffiths wrote: Joseph Gray wrote: I have a borrowed HP 5328A with the Universal Module. I'm using averaging mode and auto triggering. Counter does not have the OCXO option. I'm using the internal oscillator, not locking to my GPSDO. I was

Re: [time-nuts] T.I. experimenting - newbie question

If I understand you correctly, then I did not have things setup symetrically. Now I have a tee on each of the A and B inputs. The unused port on the B tee has a 50 Ohm terminator. Is this what you mean? With the above setup, using the shortest cable I have gives me 1.5 ns. Adding the longer cable

Re: [time-nuts] T.I. experimenting - newbie question

Speaking of the 5328A, for strictly T.I. use, would having the OCXO option be better? I have a different frequency counter that is much better for that purpose. Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] T.I. experimenting - newbie question

I would not trust the VOP of any coax cable of a non-precision types. Generally, if you need that kind of precision, you use air line or hard line and measure it with a TDR. -John = If I understand you correctly, then I did not have things setup symetrically. Now I have a tee on

Re: [time-nuts] T.I. experimenting - newbie question

Oops. I just noticed that I had previously punched the wrong button and had the wrong frequency out of the Spectracom. Using the loweset frequency of 100 KHz (as I thought I was using before), the T.I. readings are much more stable. Using these new numbers gets me even closer to the measured cable

Re: [time-nuts] T.I. experimenting - newbie question

John, the intent was not to precisely measure the VOP, although I would expect Belden cable to be fairly close. I'm just messing around with a piece of equipment that I haven't used before and doing simple experiments to see if I get reasonable results. I used to own a 5370A, but it had something