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Yes you are right, I had just spent a while reading posts between Eric and a couple of users on the tinysa site and had forgotten that I had switched sites before

Erik has nothing to do with VNA products - he manufactures the tinySA... Th OP has a product which is an owocomm design.

Firstly any nano vna advertised as performing up to 30GHz is making false claims about its specifications. Secondly it sounds like you didn’t discharge any static from the antenna before connecting

Hello, I recently purchased a nanovna s-a-a-2 (hardware version v2_2, 50k-30ghz, owocomm design), and after around 2 weeks of work the measurements on the s11 port decided to malfunction. At the

The antenna, being in the attic, is already influenced by very close-by objects. The best you can do is isolate it from the measurement setup - the NanoVNA, the laptop, and anything the laptop is

According to Transmission Line Details V2.0.1 Reflection Losses of 100 feet of cable, VSWR=2:1, Frequency = 14 MHz Belden 8219 (RG-58/U) = 0.327 dB Belden 9258 (RG8/X) = 0.215 dB Times LMR-400 =

Another idea: with a simple program like RFSim99 you take try the dimensions of the coil and enter them in the program. You will then get a calculated frequency and an inductance. Herman ON1BES

Why do you want to measure that choke? Is there a problem with it? If you can't loosen that choke, measuring with a VNA is almost impossible because of the correct connection to be made and the own

The loss attributable to a 2:1 VSWR can be stated as a constant,; the reflection loss from a 2:1mismatch is 0.512dB. Wwhat is variable is the loss before the incident power hits the mismatch, and

I was using the NanoVNA-D-v1.2.29 source code, and found that there is a bug in exti_v1.c. Because I added PA8 as an external interrupt, but when I enable the relevant code, I found that after

there's a bunch of definitions? ?there's also the 2d^2/lambda when measuring gain on an antenna rangeSent via the Samsung Galaxy S24, an AT&T 5G smartphone

?Hi, Bill - thanks for the welcome note. Going along with Dave's recommendation of attaching a couple of proper ferrites around the 6-ft coax at the feedpoint, try adding a couple of ferrites at

Best for you to read up on antenna design. But think of a drawing of a half-sine-wave along the length of your antenna. The voltage is maximum in the middle, dropping to zero at the ends. We drive

Hello, Marty, Thank you for joining in! The question on the table is to formulate a viable VNA measuring strategy given all the previous discussion and specifics. Obviously, my

Barging in here for a moment... In general antenna theory, the "far field" starts at 10x lambda. That is where the E and H fields have become coherent. Regards, Marty Hadfield, CPBE WA/OR/ID FCC

Stan KC7XE, Thank you for the comments. ". . . A 40m dipole just won't match or radiate well on 20m. . . ." 20m is the first harmonic of 40m. The antenna should approx. a full wave on 20m.

Dave - W?LEV; I hadn't thought of near field issues. I have had instances of interaction between my body and other objects with VNA measures before. As I understand it, at 40m HF, using a 1/2 wave

si5351.c

Even though most readers will understand what Joe intended to say, his usage of the term ERP is fundamentally incorrect and could lead to further incorrect use of the term by others. I'm sure Joe

In your measurement of the antenna only at the VNA end of your 6-foot jumper, it would be a good idea to attach a couple of 43 material clamp-on ferrites around the coax at the feedpoint to isolate