开云体育

Great idea! Some blades like that also have at least 4 holes in them so you could potentially either drill those out to fit a larger bolt or find a small enough bolt to pass through and use a bolt

Steel cookie sheets are easy to come by So is steel sheet at the hardware store.

I actually was considering building a ground plane for basically this same use of testing mobile antennas and came up with the idea of using a Harbor Freight circular saw blade (7 1/4 inch 140T

I direct connected my HT whip to the VNA when tuning some "Tiger tail" ground radials for my HT antenna. The antenna was a dual-band whip about 15" long, and I swept it attached to nanoVNA-F which has

In my K and GMAX plot above you can see that the MMBTH10 can actually go unstable up at about 2.4GHz if given the correct input and output networks. K dips below 1 at this frequency. This vital

There's always the risk of damage (to the VNA) when measuring high power devices with a VNA. There are ways to minimise this risk, but this usually comes at the expense of measurement uncertainty. The

I'm trying to get my just installed? Android nanoVNA app working with a older nanoVNA? running nanoVNA-Q. I can get the NanoVNA-Q device? to work with? the windows version of nanoVNA saver. I also

On 10/20/22 3:55 PM, W0LEV wrote: > Most RF devices give you an S-Parameter table or at least show you where > the input and output are placed on the Smith Chart. > Dave - W?LEV > Not necessarily -

Hi Jim, Thanks for the advice. I will probably first try connecting it directly to my VNA. 73 Frank KF2YD

Sounds like you've got some common mode RF currents coming in on your feedlines. While your radios are generally relatively narrow band devices, your NanoVNA is by design a broadband device and could

Most RF devices give you an S-Parameter table or at least show you where the input and output are placed on the Smith Chart. Dave - W?LEV -- Dave - W?LEV

most of the work with active devices on a VNA is "fixturing" - spend a bunch o bux and you can get a box that hooks up to your VNA and the device that does a lot of it. I guess if you're doing

Here is a screen shot showing FW Ver. 1.2.16 Clyde KC7BJE

Right. I think mine is some 4ohms, but I have some 30W transistors with less than 1ohms. I think I have todo something like you said, using a 4 ohms resistor and some capacitor at first. Problem with

Zack's got the best answer! Just putting the HT antenna right on the NanoVNA, held in your hand, is probably a pretty good simulation of the antenna in its "natural environment" on the HT. Unless you

Hi Zack Done a fair amount of work in this area.My best results was transmitting then adjusting the antenna for best field strength.Because you are tweaking the antenna to an impedance the transmitter

I was thinking of aluminum foil as well. One would have to insure a good electrical bond between the various pieces of foil as I've not encountered aluminum foil a meter wide yet :) Copper tape with

And yet, in real operation these antennas do not have a ground plane (unless you consider the HT a ground plane, but it's inadequate). So why not measure the antenna as it's going to be used in the

If you don't care about replicating the human half of the HT antenna, then a pizza pan or large cookie sheet works well. It's repeatable, etc. FWIW it should be 1/4 lambda *radius* not diameter. so

Understood. Maybe 1.2.16 is Alpha code. Maybe DiSlord can comment. Mike N2MS