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Hi all something doesn't seem to be working very well, the most recent firmware 1.2.40 of DiSlord installed on SEESII H4, I really appreciated the characteristic impedance conversion function for SWR

Southeastern VHF Conference 2025 Announcement & Call For Papers Quality Inn, 3095 Wilma Rudolph Blvd, Clarksville, TN 37040 April 4th and 5th, 2025 Papers and presentations are solicited on both the

? If you draw a band between 51,5 and 48,5 ohms over the graphic you will see that the sensibility of minimum SWR point is very high , then with coaxial impedance variations this frequency would

As such, there is no R/X chart. Using the Smith Chart and the cursors, you can read the R ± jX at the top of the screen at the frequency of the cursor. The complex impedance can be expressed either

Thanks for taking the time to fully answer my question.

Please read my previous post. I upgraded the firmware and found it. I was just suggesting that the getting started guide needs updating. If you read this it does not mention the SD card.

You haven't look very hard. First, READ the WiKi on the groups files section. Second look at past posts. This has been covered many times. Third, there are several ebooks or hard copies available, for

On the NanoVNA-H4 you have to plot R and X using a separate trace for each. However you can plot R and X on the same graph using RigExpert's AntScope 2 program which does interface to a NanoVNA-H4.

VNA... The full name is NanoVNA-H4. Manufactured by Hugen and sold on the Zeenk AliExpress store or from various distributors like R&L in USA

Maximum power transfer occurs with a zero-ohm source. Further, the impedance of the vast majority of good 50-ohm coaxial cable is typically ± 3 %. Here is a quote for Amphenol RG-58U (from the

This is the typical case if mixing concepts.Its very crear that the amplifiers don?t have a 50 ohm resistor inside , un less you live in a very cold place and need some extra heating… My idea were

QUOTE (Jeff, G8HUL): Also with a 50ohm coax it will not be possible to alter the length to achieve a 1:1 match. Changing the length will just cause the observed impedance to travel around a

I think also there's a confusion engendered by the term "efficiency". Is that the efficiency inside the Tx? Or the "efficiency" of power transfer to the antenna (i.e. Pradiated/Psupplied)? (you'll

You are right to ask yourself. There is one fundamental thing that you forget, that the TX -> line -> Antenna system is only adapted in one direction. The antenna adaptation devices (box for example)

Thanks Dragon, I couldn't find anything specific in the forums, and it's not mentioned in the PDF introduction guide in the downloads section (which is otherwise excellent), so it's not quite

That has been discussed dozens of times before, just search the group. Anyway what seems to be your problem? Saving of screenshots works out of the box with any firmware released in the last 2 years

No, but I happen to have that book on this Android smartphone. So, every time you ask for a particular type of help, I open the Kindle app, launch the book and go to the answer. Then I tell you to get

At resonance the imaginary part of R ( reflection coefficient ) is null , see the attached picture. This is because Z1 is a real number. In this case 50 ohm. Its very common to see that the SWR

I think you must be on commission!!

For the very last time: Get the Kindle book NANOVNA EXPLAINED by Mike Richards, available from Amazon books. Download that digital version to any Kindle reading app...and search for "SD