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On Sat, Apr 4, 2020 at 04:54 PM, <jamesklebba1@...> wrote: I'd imagine good sealing and conductivity is quite important at the edges of the aperture where the box meets the test material.

When you wrap an insulated antenna like a rubber duck with foil, you are creating different resonate circuit formed by the added capacity of the foil wrap and the inductance of the antenna.? Your

Will either of these 2 3.2" screens fit https://www.aliexpress.com/item/32819384322.html?spm=a2g0s.9042311.0.0.7eb04c4deBphdN or

So what is the "trick"? Ray, W4BYG -- This email has been checked for viruses by AVG. https://www.avg.com

BTW, the email posted to your question by one who has done MIL-STD-285 (If I remember correcty) is far more correct and rigorous. I've also done '285 testing, but so long ago, I certainly don't

When you wrap the helical antenna with Al foil, you are capacitively shorting the turns so it basically becomes the physical length of the form on which the windings are placed. When you connect the

Herb, That sounds like a robust testing procedure. I'd imagine good sealing and conductivity is quite important at the edges of the aperture where the box meets the test material. Perhaps one could

Thanks Dave. So this detuning of the antenna will happen regardless of whether or not the conductive material wrapping the antenna is making electrical contact with the metal part of the antenna (the

Thanks hwalker! Success Upgrade, I will test some time this weekends

Web sire says it is so. http://www.randl.com/shop/catalog/index.php?cPath=15_8620&sort=3a&filter_id=142 73 -Jim NU0C "Greg Parsons" <ratgdh@...> wrote:

Alex, The posts Bob and Herb highlighted are good sources. However, they may still challenge your thought process! May I ask, if you were to measure an inductor, a capacitor or a resistor and will

Another good reference for measuring the impedance of common mode chokes, important to determining if a core is of use for baluns, check out G3TXQ's site:http://www.karinya.net/g3txq/chokes/ Using an

Just be aware you may need to download several tens of megabytes of Asian fonts. -- I_B_Nbridgema

I was just going to post the same thing. Will be calling them Monday to see if they have them in stock. Greg Ke4ooo

Just got this in my email today. For those looking for a USA seller R&L has the H and H4 in stock. No affiliation, but I have purchased from them before with no hassles. 73 -Jim NU0C Begin forwarded

Alex, A number of members have previously responded to measuring inductance using the NanoVNA. Please use the following group search /g/nanovna-users/search?ev=false&q=toroid and one

Yes, very simple.? Calibrate the nano and then select Smith chart display.? Inductance will be shown (at the marker frequency) at the top of the display.? (Connect to port 0) Then you can move the

Two identical antennas is all you need. I've done this many times for 900 MHz antennas. Put them face to face at approximately 3 wavelengths apart (that's in the far field) and away from other

Roger Need wrote, .....Do you think DisLord's software will be released as non-beta version or will we have to wait for edy555 or Hugen to release a version incorporating his improvements?.....

On Sat, Apr 4, 2020 at 11:52 AM, Dr. David Kirkby, Kirkby Microwave Ltd wrote: It is very easy to think that you need an absolute standard (i.e. something known) in order to make absolute