Hi
Helmut, Nick, Corneliu and Martin,
thanks for the kind replies - indicating that the Lambda/8 method is not commonly known.
The value measured that way is good for just that one Lambda/8 frequency.
The Method is fast and easy. It saves time and quite often is all you need.
That is the strength of this method, that I first learned from DC1MKR in our local club.
If maximum precision is your need, not just fast practical results, you will prefer the frequency
dependent cable properties described by AC6LA. Find it, for example, in:
Zplots.xls and applied in
SimSmith
for many popular cable types and makes.
Both freeware programs are highly recommended to all NanoVNA users.
73, Hans
DJ7BA
-----Urspr¨¹ngliche Nachricht-----
Von:
[email protected] <
[email protected]> Im Auftrag von Roger Need via Groups.Io
Gesendet: Freitag, 27. Dezember 2019 19:19
An:
[email protected]Betreff: Re: [nanovna-users] quick measuring cable characteristic wave resistance
I experimented with this Lambda/8 method using the program TLD (transmission Line Details) and got within .4 ohms of the cable impedance after doing a number of different tests. TLD contains the characteristics of many kinds of cables and calculates input impedance at various frequencies/line lengths based on a user input load impedance.
TLD is a free program and is available here >>> . Highly recommended
