开云体育

It has been stated, by multiple members of this group, that due to hardware deficiencies (port 2 is not a perfect 50Ω) and lack of 12 term error correction, the "S21 method" can't be used to measure

Clyde, Yes, often the datasheet states the measurement frequency. But this is invariably a "low" frequency, low enough to keep parasitic effects negligible. The inductance or capacitance of a

This is the only publicly available version I have found. Works on my Win 64 computer... You want to download the .rar file and decompress it with something like 7 zip...

Thank you to all who replied. But, since the values I was seeing didn't match prescribed values (and it was driving me a bit nuts), I tried the experimental approach. I took a single RF Demo Kit board

Excellent presentation thanks for sharing! :-) 73! Greg / W4GAP

I once loaned a (VERY CHEAP) analog multimeter to some technicians that used it to check the resistance of the power lines. When they brought it back, the inside of the case was copper clad.. They

I say go for it, 1.2W is nothing and the soldering lesson you will get afterwards will be a great learning experience.

Ed, There have been a number of good posts by others describing the characteristics of inductors and capacitors versus frequency. Parasitic capacitance is a big factor and needs consideration. This

Well, the radio is a QRP Pixie kit and it doesn't put out very much power; I just wanted to test if I soldered the connections well. I have an analog multimeter I could use as well. Eventually I plan

The second one is pretty much what I was thinking of. Apparently he is making the Gerbers available.

Hi Barry, I agree with Arie above. I wonder if you have seen the slides from my 4 hour presentation on the NanoVNA (some stuff is probably outdated now).

Howard and Rudi, I have gotten the SWR for the DIY 70watt HF Amp kit to work with a Hermes HL2. It took a 16ohm 5watt or higher resistor across the secondary of the input transformer. If you look

Hi John, Attached the screen print before it disappears. I am grateful for the assistance. Danie ZS1DBJ

Hi Barry, It's getting more beautiful every new version, two thumbs up. About the Smith Chart and losing the audience. If I explain the Smith Chart to my children (read: listeners) I start telling

EXAMPLE from DAYS PAST: In the TTL days of logic long past to newbies, it was common practice to place a black, CK05 (0.1 ?F) capacitor at each end of a row of logic chips. This was placed between

Hello Howard, Do you have this one bought? https://www.ebay.de/itm/70W-SSB-linear-HF-Power-Amplifier-For-YAESU-FT-817-KX3-DIY-Kits/272629674094?hash=item3f79feb06e:g:xvwAAOSwAANY73ML I could not make

* Nano VNA overview by K3EUI Barry * Each time I give a "talk" on the Nano VNA I learn something new. I've given five talks now, and from the questions from listeners, I know where the

I use my nanoVNA to test the input swr. I found that the 70 watt kit on eBay has a high SWR at the input on some bands. I am in the process of optimizing that now.

Clyde Spencer wrote: The chart says the frequency it is measured at. Not how much inductance varies with measuring frequency. I have carefully measured normal HF range inductors with a dip oscillator

CAPACITANCE AND INDUCTANCE ARE SPECIFIED AT A GIVEN FREQUENCY. See the example. [image: image.png] *Clyde K. Spencer* wrote: