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The answer to your question is that you need to do several things in order to accurately determine the length of a 1/4 wave length of balanced 450 ohm ladderline for operation at 2M (144 MHz.). 1. You

There were a lot of interesting answers to other questions, but the question I had was whether to use or not to use a balun, which roncraig1 did address. Thank you roncraig1.

Window line is great at HF.? But remember that it consists of tandem sections of transmission lines that have two different characteristic impedances.? When the wavelength is so long that a large

Hey Rick et al., TNX for the heads-up about the nanoVNA guidebook! 73 Ray 4X1RB From the home of Prof. Emeritus Raymond (Reuven) Boxman School of Electrical Engineering Tel Aviv University Cell:

This is why I suggested the use of a choke at the feedpoint; you can use a few turns of the transmission line or a so-called "bazooka" or "sleeve" balun:

Interesting questions. How about the same scenario for the 300ohm balanced windowed line. How would you measure for the 1/2WL of that cable Fred - N4CLA wrote:

NanoVNA-App NanoVNA-Saver also work vs SAA2

I'm not exactly sure what you want to measure. I assume you'd like to measure the velocity factor and the characteristic impedance. Might I suggest the following: Build a test fixture to connect the

In addition to the maximum span needed for short distance resolution in TDR mode, some industries, i.e. the cable television industry, utilize wide bandwidth filters, band stop, and high/low pass

Are you trying to verify the impedance of the 450 ohm twinlead or do you need a method of measuring how long it needs to be for 1/4 wavelength at 2M (144 MHz.)? Roger

Try downloading the RigExpert AntScope2 program. It is supposed to work with the SAA2. I have not tried it myself. Roger

V2 (SAA2N) use binary format for exchange Only H / H4 / FV2 have console commands

In my last fw i add measure Cable Option and Port Z normalization You can try use this feature for measure cable Z0 and lenght (use Marker->Measure->Cable S11), and see how it look if measue on 450 Om

You should be able to measure transmission line as if it was inductor at electrical 1/8 wavelength to get Zo. Short out far end and other end terminals looks like an near infinite impedance at 1/4

Maximum span is needed when doing Time domain reflectometry. Very useful e.g. to measure cable length or to find the location of cable faults.

Hi, I am attempting to connect my SAA-2N NanoVNA to a console on my Windows 7 computers (laptop and desktop) but all I get on the screen is just "2" each time I press Enter. As connection com port

I am about to measure a 1/4 wave of 450 ohm windowed twinlead for the 2m band using my NanoVNA. My question is, since I will be making an unbalanced to balanced connection, should I use a common mode

That's where I got mine. I've dealt with them on a few occasions, and have been nothing less than totally satisfied with my purchases. -- Member of the toughest, meanest, deadliest, most unrelenting

On consideration, I'd like to point out that the presence of the harmonic degrades the dynamic range by 6 dB. Which is why I found the extra peak strange. Have Fun! Reg

Phil, That's the correct link. Sorry about any confusion. I'll be more careful in the future. R&L is a reliable place to get a genuine nanoVNA or tinySA. It's a very good intro. I read the whole thin