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Dave, Thanks for the chart. Were all of the measurements taken with 1 turn except the BRN which you indicated 11 turns? Mike N2MS

I'm trying to get the length of the ladder line portion of a feedline that includes both co-ax and ladder-line. The radio connects directly to 6 feet of coax, then a balun, then 50-some feet of ladder

The 'big boys' who design the materials use one turn through the core to characterize the ferrite material. They measure in a 50-Ohm system. Remember, one turn equates to passing a conductor through

Nice work Dave. Mel, K6KBE

What you have constructed is not quite a common mode choke (CMC). It is a current choke or current "balun". Technically, it isn't even a true current "balun". It works by dening current flow on the

Obtain the transmission Zt from a s21 measure requires a calculation. Zt = Zo * 2(1-s21)/(s21) Zo at 50 ohm. Then find the real and imaginary parts.

But if the choke balun is highly inductive and not very resistive, it will form a resonant circuit with the antenna's total capacitance to ground, and other reactances in the antenna/feedline/ground

Hello, I have made (several) CMC-filters by wrapping RG58 on a FT240 mix 31 toroid, the result is very good. I have a special instrument to check the current on the coax outside shield and that goes

Velocity factor does change with frequency. Here is a plot of one type of Belden 75 ohm coax Roger

Hello. Today i received my new NanoVNA v2 SAA-2 .. Is Hugen's AA Firmware compatible with this device? I search for a Firmware with a bit more large Letters. Thanks for help! Greetings Wolf

Hey Roger, thanks for your answer. Running a TDR on the cable between 5 and 100 MHz (505 points) shows the correct length of cable (14.89m) at 0.859 VF. (which is a 4th VF value..) Dani

American Scientific Surplus has some good instrument cases. https://www.sciplus.com/small-odorproof-case-65609-p

Have you tried using the TDR method to find the VF of the cable? Roger

Jim, A great solution. I would use that, except that I now want to include my Anritzu SiteMaster. Which is as big as both the Nanos combined and then some.

Your balun should have much larger inductive reactance than your antenna, that is the best advise I have found.

Thank you Roger. Very good idea. Some members of this group sent me email pointing to typos in the Guide. I wish to thank them all. It will be corrected in a future update. If anyone notice error,

I can actually fir both the VNA and SA in the Harbor Freight box I use, as well as the short jumbers and USB cables and a plethora of adapters. It just depends on how you arrange the dividers. There's

Martin I posted your Guide on several NanoVNA Facebook Users Groups. The response from dozens of people was to thank you very much! Many of them just got a NanoVNA for Christmas and your guide was

I bought handgun cases for my instruments on ebay. They have foam, different sizes and inexpensive. [email protected]> wrote:

Hello, I'm trying to measure a 40 degree delay line on 1.83 MHz for a 75 Ohm cable. Would the S21 Phase reading be reliable given that the in/out of the NanoVNA is 50 Ohm? I cut the cable for S21