开云体育

For those who wish to dwell more in the return loss world instead of the SWR world, or to gain a link between the two, here is a nice online chart that converts between the two measurements.

Re: your open wire fed doublet, 1. do you attach the Twin lead through a banana plug adapter into the VNA port 0 and measure directly? No. If you are referring to the data in the Word write-up, the

Baluns What is a balun really? Something which converts a balanced load, antenna etc to an unbalanced source, a transmitter a VNA etc. If your antenna is not balanced (a dipole) then you don't need a

I can't comment on your VNA measurements as I have no experience with VNAs. Mine hasn't been delivered yet but I do know about antennas. Your predicament is not going to get solved with VNA graphs &

David: Re: your open wire fed doublet, 1. do you attach the Twin lead through a banana plug adapter into the VNA port 0 and measure directly? 2. If so. Do you calibrate the input plane at the plug,

At the very end of your plot, you might squeeze in 50 MHz, 6-meters, as well where you should not need a tuner. Dave

You're certainly looking good at 40 and 15 meters. Also at 36 MHz where we don't have an allocation. Looks very good! Now, you might zero in on both 40 and 15 meters and do a measurement of those

I have the antenna spooled out to exactly the 7Mhz silver markers on the wire here is the readings on the antenna with my homemade choke on it. Not sure what other improvements i can make yet. Based

That sounds like an excellent idea! Roy WA0YMH

To measure the total inductance, or more importantly, the +jX of the windings: Short both conductors together at both ends so the choke forming a single conductor consisting of two paralleled

Dental floss is a good way to cut through the adhesive, and it doesn't stress the LCD. Ed - n5kzw

Martin: Re: If you wish to examine the common mode impedance of chokes like this, connect the VNA across the windings between both wires of the Balun connected together at the input and output of the

Excellent work, Martin. As a first work on this and in a second language to you, you did very well. Helpful advice: You should expand the section on flashing firmware as this is an area that scares

Martin, odli?an posao, hvala. (Great job, thank you) YU7NS Milan

Hi Andrea, I have an hp workstation that runs a filter design routine, but ELSIE, is an excellent source for the same tool. Try it. Alan

HI Martin, great work! for beginners but also for all the other users. Many thanks 73 de Gabriele. I4JXE Inviato dal mio telefono Huawei -------- Messaggio originale -------- Da: "Martin J.K."

Excellent English, Martin... well done for an extremely useful document. I've only skimmed through it quickly, and the only thing that jumped out at me was misspelling Stimulus? on page 26. Many

The #14 wire and the large cores which I use address the requirement of operating at full power of 1.5 kW. Not that I use that much, but on occasion on 75 and 160, it is required. There's no doubt

Martin J.K. added folder */Absolute Beginner Guide to The NanoVNA* --- The following files have been uploaded to the Files area of the [email protected] group. * /Absolute Beginner Guide to The

I have uploaded file in files section of this group: Absolute Beginner's Guide to The NanoVNA. Comments are welcomed here or to my email: 9a2jk _at_ hamradio.hr As English is not my native language