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I have 2 VNAs . H4 and New F v2. Using the H4 to measure coax length I get a reading that's spot on. But when I use the F V2 the reading is like 60% or more / greater than it should be. H4 at marker reading at top right on the screen 16.01 meters for a 52 ft RG-8X coax. But the F v2 shows for the same coax 1034. m, I know the V2 is different in the menu layout than the H4 and I dont have a menu for the V2. There is something wrong that I'm doing or the F2 VNA is bad.

Cliff W4CBH

Did you enter the Velocity Factor (VF) of the coax the same in both units ?

Yes, if you mean the value. Both 82% for RG-8X. Even if the VF was off maybe 5 meters still shouldn't come up with over a 1000 m for the 16 m / 52' length.
________________________________
From: [email protected] <[email protected]> on behalf of Mark Foster via groups.io <m.foster99@...>
Sent: Wednesday, March 5, 2025 8:01 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA F V2 not working correctly

Did you enter the Velocity Factor (VF) of the coax the same in both units ?

Just out of curiosity...for the H4 the VF is entered as a decimal as 0.82. Is the F V2 VF entered the same or is it in percent?

73,
Geoff -->AB6BT

Entered 82 no % (.82) just 82 and it comes up on the screen as 82%
________________________________
From: [email protected] <[email protected]> on behalf of Geoff Peters - AB6BT via groups.io <AB6BT@...>
Sent: Wednesday, March 5, 2025 8:43 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA F V2 not working correctly

Just out of curiosity...for the H4 the VF is entered as a decimal as
0.82. Is the F V2 VF entered the same or is it in percent?

73,
Geoff -->AB6BT


On 3/5/2025 6:18 PM, CLIFTON HEAD via groups.io wrote:

Yes, if you mean the value. Both 82% for RG-8X. Even if the VF was off maybe 5 meters still shouldn't come up with over a 1000 m for the 16 m / 52' length.
________________________________
From: [email protected] <[email protected]> on behalf of Mark Foster via groups.io <m.foster99@...>
Sent: Wednesday, March 5, 2025 8:01 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] NanoVNA F V2 not working correctly

Did you enter the Velocity Factor (VF) of the coax the same in both units ?