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I have placed a version of firmware for the NanoVNA-H which supports the command line interface (shell) over UART on github (https://github.com/DaveLapp/NanoVNA-H/releases). This version of firmware

Hi all, thanks to the support of DaveLapp I was able to interface a HC-05 Bluetooth module to the "P3" port of my nanoVNA-H (PCB 3.4). Just few days ago, Dave made available a firmware release (at

The two cables basically move the "reference plane" to the end of the cables, when the cal is done right (i.e. for the single port cals, it should be cable from Ch0 to f-f adapter to Short, or open or

Works like clock work after you instructions. Many thanks Roger ! )) Per

Oops, I left out " at 40 meters." It should say "135 feet is very close to 1/2 wavelength for 80 meters, and a full wavelength on 40 meters."

135 feet is very close to 1/2 wavelength for 80 meters, and a full wavelength. A 1/2 wavelength (and multiples of 1/2 wave) antenna has an impedance in the range of 3,000 to 5,000 ohms. As was

Not exactly accurate. This configuration (without 9:1 unun) would exhibit impedances ~200 - 300ohms at a few points between 1 & 50MHz. Some of which are in or near ham bands (11MHz, 18MHz at the

The wiki page External links ( /g/nanovna-users/wiki/12395/118670 ) has been updated by Oristo. *Reason:* TLW3 added Compare Revisions (

1) frequently connecting and disconnecting directly to nanoVNA's rather fragile connectors accelerates wear and reduces operational lifetime 2) ANY changes between calibration configuration and

The instructions assume that you would be using the 2 cables to measure S21 on some 2-port device. This would mean attaching the cables to SMA ports on the device under test. Calibrating this would

Hi Roger many thanks , TLW3 program works also on XP sp3 , and in your zip file I found also the images to drawing the tuner. Best Regards Maurizio IZ1MDJ

Hello, Newbie question: The nanovna wiki recommends for calibration: "Connect cables to the CH0 and CH1 ports, connect the cables with the through connectors, and execute CAL CALIBRATE THRU." Is there

The nanovna is telling the truth - A 9:1 unun with a 135' wire will not have resonance on any band. Most of your signal will not radiate and it will be converted to heat. Replace the unun with a 50:1

I have heard many stations using G5RV and, for the most part, they don't have big signals.? My conclusion is that this antenna is not that great, certainly when compared to a resonant antenna. You

Is the antenna (the 135 ft length) positioned between 2 trees so not much of the antenna is being touched by the leaves or is the antenna laying on a tops of a couple trees so a lot of the antenna is

Thanks Darrell N5FTW Sent from my over-rated IPhone 7 Plus. Any Mis-spellings or grammar errors are due to my IPhone auto correct feature.

Bob Albert, thanks. What you say makes sense for the little I do know. It is a 9:1 matchbox. I have limited space and was trying to find an antenna to work all bands just by changing frequencies and

A 135' end fed half wave should be resonant somewhere in the vicinity of the 80 meter band (3.5 MHz). The exact resonance will depend on height above ground and the proximity of structures, among

First decide the frequency range of interest.? Then program it either as start and stop, or center and span.? Then set up for Smith chart and SWR display. The Smith chart will plot the impedance of

I can assure you the NANOVNA's agree quite well with equivalent measurements using the HP 8753C VNA - FAR more expensive!! It's a good instrument. Dave - W?LEV wrote: