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Re: Android NanoVNA WebApp - does not work #nanovna_webapp
It finally occurred to me that careful shopping e.g. on eBay yields a fairly recent Android device with bad ESN cheaply with less trouble than trying to update Android an older device
By Oristo · #7120 ·
Re: NanoVNA-Saver 0.2.0
Hi Herb Just for the fun of it I measured a blue junkbox core as in my closed chamber as seen on the picture. It can be calibrated on the inside with a SMA male ideal kit and therefore suited for the
By Kurt Poulsen · #7119 ·
Re: NanoVNA-Saver 0.2.0
Kurt Poulsen wrote: "Actually if you make a.sweep of the test fixture without the clamp, and in the NanoVNA-saver display r+jx then you have a graph for the real impedance to print"
By hwalker · #7118 ·
Re: NanoVNA-Saver 0.2.0
Hi Herb Great, I am pleased to hear the progress. Actually if you male as sweep of the test fixture without the clamp and in the NanoVNA-saver display r+jx then you have a graph for the rod impedance
By Kurt Poulsen · #7117 ·
Re: SWR...Nano versus Transmitting
Howdy Ron, Properly calibrated, the nano should give you much better accuracy than even a very good SWR meter, because a VNA calibrates at many points (101 for the nano) across a frequency span,
By KV5R <kv5r@...> · #7116 ·
Re: SWR...Nano versus Transmitting
Roger! What band are you doing your testing on? Also, is your xmtr running on AC power or battery? Tom AE5I
By Tom AE5I · #7115 ·
Re: Increasing measurement range (ohms) ?
you can use impedance transformer. Transformer impedance ratio is a square of turns ratio (or voltage ratio). For example, RF transformer with 1:2 turns ratio will works as 1:4 impedance ratio.
By QRP RX · #7114 ·
Re: R?sp.: Re: R?sp.: Re: [nanovna-users] Duplexfilter tuning question
If you are intending on tuning a 6-cavity BPBR set of 'cans' for 6, 2, or 70-cm using the NANOVNA and intending to obtain what is typical isolation with a 6-can duplexer, the NANOVNA does not have
By W0LEV · #7113 ·
Re: NanoVNA-Saver 0.2.0
Kurt, After a good nights sleep I and a second mulling over your post it became even clearer that I had deceived myself into thinking I could calibrate out the test fixture by treating it as an
By hwalker · #7112 ·
Re: Increasing measurement range (ohms) ?
Without fully working thru the math, I >>guess<< that back-calculating shunt would lack better accuracy (S/N) than straight measurement. A green (not blue) ~US$10 reflection bridge e.g. from eBay
By Oristo · #7111 ·
Re: SWR...Nano versus Transmitting
Thanks for the reminder and suggestions. Yes, I have calibrated using my cables to connect with my antenna. This users group is great!
By Ron - An Old Ham in Utah · #7110 ·
Re: TDR Option
Dick, I forgot to add that currently all firmware releases for the NanoVNA-F are single sourced by BH5HNU. One of the advantages of the smaller NanoVNA is it has a number of creative firmware
By hwalker · #7109 ·
Re: TDR Option
Dick, The Nano-F has different firmware that is not compatible with the smaller NanoVNA. You can still perform TDR measurements from the PC side using NanoVNA-Saver or NanoVNA-Sharp. You can also make
By hwalker · #7108 ·
Re: Replacement Power switch
Accidental issues are not the end of the world - just turn it in again.
By Harold Farrenkopf · #7107 ·
TDR Option
I have a NanoVNA-F (Firmware Ver. 0.0.3). I also have a Users Guide that talks about the TDR function. I cannot find that function on this NanoVNA. Was the TDR function a Firmware Update ? Thanks for
By Dick · #7106 ·
Re: Replacement Power switch
An electronic switch that has to be pressed for a second or two to turn the device on or off would be even better in order to prevent accidental issues.? On Sat, 16 Nov 2019 at 10:13 AM, Harold
By Larry Rothman · #7105 ·
Re: NanoVNA Noise improvements. Hugen79's NanoVNA Github Issue #14 #filtering #noise #improvement #hack #circuit
Please be aware you may be able to calibrate till 1500MHz but the measurement of anything different from SOL can still be completely wrong due to non linearity errors -- NanoVNA Wiki:
By Erik Kaashoek · #7104 ·
Re: SWR...Nano versus Transmitting
Ron, Have you calibrated he nano with a calibration standard of the same style that your antenna connector is? I.E if your cable connected to the radio has a male UHF connector, your nano needs to be
By Bilbo · #7103 ·
Re: NanoVNA-H v0.4.0
John, Try Dennis Real's firmware release for an even better antenna analyser experience. Search for forum member reald here or on GitHub.? On Sat, 16 Nov 2019 at 11:00 AM, John Ackermann
By Larry Rothman · #7102 ·
Re: NanoVNA-H v0.4.0
Thanks! That seems like a really useful combination then -- simple, easy to read display on the go, with full power when you're connected to a host.
By John Ackermann N8UR <jra@...> · #7101 ·