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Right, yes, I know the VF is independent of length. The test has nothing to do with determining VF. I have already done that with a piece of known physical length. The test I have set up is a piece of

Measure from the other end and see if the two results add up to the correct total length. If they do you can at least have better confidence. If they doi not you know there is a problem. 73, Don N2VGU

The VF for the TDR test will be the same no matter what length you cut the CAT6 cable. VF for a specific type of cable will vary by manufacturer and even different between production runs by the same

For some reason, my messages are not making it to the email chain...they are in the groups.io online...

OK, I see what you mean, and I suspect the the VF can vary by 1% over the length of the cable. I will test with a piece of CAT6 by cutting one wire and reconnecting at one foot intervals.

The resolution is 4.8 mm but the accuracy will be worse because you cannot enter the VF to more than two digits. So if the VF is 69.5 % and you have to enter 69 or 70% that will affect the calculation

Sigi, Yes, I have a piece of CAT6 cable to test. I removed the jacket at 1 foot intervals for about an inch. I will test by cutting 1 wire at a time at each location and see what I measure. Geoff

take 10 inch of speaker wire.. that should show almost similar numbers.. if thats the case then yes you can trust it dg9bfc sigi Am 23.08.2023 um 22:52 schrieb Geoff Peters - AB6BT:

Roger, I sent a reply but it hasn't shown up so here's take 2... In this case, what I'm trying to determine is the minimum distance I can measure to a fault.. I used 4.8mm to simplify this discussion,

Roger, Mainly I'm trying to determine the minimum distance to a fault that I can measure. I understand that the 4.8mm number is dependent on the VF, I was only trying to keep things simple for this

You need to be calibrated over the frequency range that you select. However there is calibration interpolation used on some NanoVNA's, like the -H and -H4, so you can arrow the frequency range if you

Yes, that's what I do, not a problem...

Make sure you enter the VF as a percentage not a decimal value. EXAMPLE 60 not .60 *Clyde K. Spencer* wrote:

I have a couple questions regarding using the Transform function to measure length of a cable. How does calibration affect the Thansform measurement? If I set the stimulus start and stop to 50KHz and

That will be a very interesting comparison test! I hope you publish all the details and measurements. (Great choices of antennas, too. My full-wave horizontal loop is terrific.) -- Doug, K8RFT

Getting Ready for the new **** MidAtlantic 40m NBEMS net **** testing: Saturday and Sunday 10 AM EDT on 7068 kHz (vfo) coverage over a 300 mile radius from Philadelphia THOR 22 check in THOR 56

Nuno, I was pretty happy with my NanoVNA-F V2 until it randomly died on me. It lasted nearly 2 years though and had zero issues with it before it died. I took a gamble and purchased the SV4401A

I forgot to add this link https://nanorfe.com/nanovna-v2.html

The only potential downside to the V2 is that they are more sensitive to ESD, because they have a monolithic RF switch at the input.

Likewise. I would recommend V2 Plus4 or V2 Plus4 PRO from an official store. There are several other version but I like V2 Plus4. Today perhaps PRO version. Battery lasts a long time and results are