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Re: Another Q-meter info source
Yes, I would like very much to see that article. 73 (Regards). Max K 4 O D S. I've Never Lost the Wonder.
By MAX · #350 ·
Re: Cal Lab Magazine - International Journal of Metrology
The rule is that units named for people are not capitalized when spelled out. That assures that "two watts" is a measure of power, while "two Watts" refers refers to two family members. A seeming
By Tom Lee · #349 ·
Re: Cal Lab Magazine - International Journal of Metrology
This matter of lower case for units has me wondering. Ever since I started my website I have been using a lower case f to represent farads. Recently I received an email from someone who was retired
By MAX · #348 ·
Re: Making a Q-meter / References etc
Thinking about it, there are 2 Pi radians in a complete cycle, so the ln(-2) being i Pi + ln(2) is showing a 180 degree phase shift. I tried computing the log base e of -2 i, which would be a 90
By Dr. David Kirkby, Kirkby Microwave Ltd · #347 ·
Re: Making a Q-meter / References etc
drkirkby@...> wrote: Oops, I forgot to attach the result of Mathematica computing the log base e, and the log base 10 of -2. I must admit, I can't make sense of that, but I'm not a
By Dr. David Kirkby, Kirkby Microwave Ltd · #346 ·
Re: Making a Q-meter / References etc
wrote: I will show you a calculator that does not - see attached. But consider a VNA connected to a wide-band amplifier with a gain of 10 dB. The output power is always 10 dB higher than the input.
By Dr. David Kirkby, Kirkby Microwave Ltd · #345 ·
Re: Making a Q-meter / References etc
I am more concerned that the math is correct, the spreadsheet is use-able and has a fairly complete set of conversions as needed for the task.? Grammer is less important or adhesion to the latest
By tgerbic · #344 ·
Re: Another Q-meter info source
That would be great.
By Dr. David Kirkby, Kirkby Microwave Ltd · #343 ·
Re: Another Q-meter info source
Hi Steve I'll send it to the group as an attachment, or see about putting it in the files section. It's small enough that it shouldn't choke too many peoples' mailboxes or connections. Probably
By Jim Strohm · #342 ·
Another Q-meter info source
Hi all The August 2022 QCWA newsletter has an article about Q-meter design. I haven't vetted it for accuracy, but it looks like it tells the truth. Knowing that not everybody here is a QCWA member ...
By Jim Strohm · #341 ·
Re: Making a Q-meter / References etc
Further to the application of dB to inverting amplifiers. All of the calculators that I have checked this on, return an error message when the ratio (Vout/Vin) is negative. When using a logarithmic
By Rodger Bean <rodgerbean@...> · #340 ·
Re: Wanted - moderator in a different timezone
I can imagine some useful applications for this in the political sphere.
By ffierling · #339 ·
Re: Making a Q-meter / References etc
At one time I did a lot of 3db frequency up/down from resonance Q measurements. To make it easy on myself, I found that 5 / 7 = 0.714, that is so close to 0.707 that the difference is hard to read on
By Mikek · #338 ·
Re: Making a Q-meter / References etc
Add to: https://www.kn5l.net/Inductor-Plots/VNWA-Measure/ Section "Single Voltage T50-2 37T #24 with 330pF C0G Q Measurement" is a VNWA BW Q measurement of same T50-2 inductor and 330pF capacitor with
By John KN5L · #337 ·
Re: Making a Q-meter / References etc
I should have read further down on the page I quoted. The Style Manual (2002:184) states: The names of units do take a plural s when associated with numbers greater than one. Examples given are: 1
By Brian · #336 ·
Re: Cal Lab Magazine - International Journal of Metrology
Thanks Dave. I was also unaware of this . ive subscribed and found a few interesting documents on the site. regards Pete
By Pete Harrison · #335 ·
Re: Making a Q-meter / References etc
The correct answer is "the resistance is 220 ohms", and "I have five 220 ohm resistors". Standard English grammar, think about what the plural refers to: lots of ohms in the first case and the number
By G8HUL · #334 ·
Re: Making a Q-meter / References etc
Thank you for looking into this, Dave. I appreciate it greatly. Your post was very helpful in reminding me how many years it's been since I updated my knowledge of the latest conventions. I always
By Tom Lee · #333 ·
Re: Making a Q-meter / References etc
Also the voltages do not state whether they are EMF or PD. Regards Jeff G8HUL
By G8HUL · #332 ·
Re: Making a Q-meter / References etc
wrote: You are welcome.
By Dr. David Kirkby, Kirkby Microwave Ltd · #331 ·