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 w
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
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 o
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
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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
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
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
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 Sat
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 cable
> 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
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
wrote:
Bruce Griffiths wrote:
>
>> The measured delay includes the time offset betw
On Sat, Apr 2, 2011 at 8:06 PM, Bruce Griffiths
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
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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 t
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 Gray wrote:
I have a bor
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 9273
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 wrote:
> I have a borrowed HP 5328A with the Universal Module. I'm using
> averaging mode and auto triggering. Counter does not have the O
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
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 S
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 sol
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 do
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 sc
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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 cha
> 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
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