开云体育

Looking better but you still have a large dip. Keep moving further apart until you can barely see it and record the dip frequency as you go. Roger

I'd think somewhere between 18.082620 and 18.085096, because that's where the imaginary part goes through zero.

Roger I made a new sending coil and it works a lot better now. -- Mike

Roger always has good ideas. Attached is the measurement (via nanovna-saver) of a trape and I will then explain to you how the measurement is made. When I read S11 Return loss I say it resonates at

Mike, You are way too close to the coil being tested. The inductance of your coil is affected by the proximity of another coil and this affects the SRF measurement. Once you have a dip on the NanoVNA

Nanovna-F has 4.3 inch IPS screen and is much more readable outdoors. -- Doug, K8RFT

Isn't complex impedance Rs + Xs j? But you said S21, which is also complex (although often displayed as magnitude and phase). But convertible to equivalent series R and X, with some math. There's been

Hello to all, Thanks for all your inputs, I made a few searches and I saw the devices you told. Actually, I just need to work up to 150MHz, I build solid state amplifiers and I need to tune the low

I recently bought the SeeSii nanoVNA-H4 which has a 4" screen. I love the larger screen. It is useful up to 1.5 GHz, but my use for HF radio is just 3 to 30 MHz, plus VHF and UHF, so this is fine for

Thanks Fran?ois for the response and taking the time. I wanted to put another plot on here, this is with another NanoVNAH4 I have and the outlier is in the middle of the sweep at ~130MHz. The

Nice job Ignacio. How many turns on your pickup coil? I had to wind my pickup coil around the end of the inductor to get enough coupling for a response. The dip is fairly close to the SRF estimated by

The following photos have been uploaded to the Pickup coil ( /g/nanovna-users/album?id=287692 ) album of the [email protected] group. * CAM01346r.jpg (

Hi, I still keep a true GDO but I had nor used it for a long time. When I built my Poor Ham Scalar Network Analyzer some years ago, I also built a pickup coil wound in an old 35 mm film canister with

The following photos have been uploaded to the Pickup coil ( /g/nanovna-users/album?id=287692 ) album of the [email protected] group. * Pickup coil.jpg (

EB4APL <eb4apl@...> added the album Pickup coil ( /g/nanovna-users/album?id=287692 ) : A coil for using the nanoVNA as a GDO.

Hi Robert, I have tried several times to send a message to cqxiegu, but I never got an answer. I can't understand how a company like Xiegu can not respond to customer inquiries. Other hams have

Hi Pedro This is the biggest screen I have seen so far:

Everitt and Anner, "Communication Engineering," Third Edition, McGraw-Hill, 1956, provide a general method (pages 330-331) for examining a mismatch between a source and load, such as a transmission

nanovna v2plus4, lite vna64, nanovna h4, nanovna -F V2, etc etc there are a handful of vna and vna v2 with 4 inch or 4.3 inch screens i recommend to use one of the newer v2 models that go up to 3 or

Pedro, There are several, but the "LiteVNA 64" has coverage up to 6 GHz and gets good reviews and comments here. https://eleshop.eu/litevna-5341.html If 2 GHz is enough try the NanoVNA H4