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Okay Mr Albert Tatlock impersonator, maybe you found a gaffe. Can you give us an overall review of this book? Anything of real interest in there? Often the chapter outline is fair game, but too much

No it doesn't. It clearly states that the main function of on ATU is harmonic reduction, which is total cobblers ;-) I've just checked, first published in 1991, and mine is the 3rd edition 2004 making

Amen Paul! I'm baffled at the cult like following the EFHW has. Put up a balanced dipole on the frequency you want to operate on. A 40 meter dipole is only 34 feet on each side of the balun/center

Hi when is my order from 17 12 21 going to be shipped says complete not shipped but some are saying received when ordered on 1 5 22, I would have thought you would have shipped those that have waited

Juhan, FYI, From the latest release of Raspi OS bullseye, you now have to enter a username on first boot along with all the other bits, pi is no longer the default.

There was a time when the ability of an antenna tuner to reject harmonics was important to many hams. The spectral purity requirements for ham rigs used to be far more lenient; for quite a while only

I'd give it that statement a pass because it says harmonic reduction is only one of the roles of an ATU. I'll bolster the argument by presuming the statement was found in, and not updated from, an

1991.

Secrets of design. Wow that's a bizarre title from a major publisher. What year was this written? Well had it been phrased as transmitter matching, natural device behavior is to generate harmonics. So

I received my shipping notification yesterday, and the QDX arrived today via USPS Priority mail. This is the fastest I have ever received anything from QRP Labs! Are they being kitted and shipped from

The hidden feature of the 808 which I stumbled upon a number of years ago…. They are an excellent tool for stripping and tinning toroid leads! - Prop tool upright - Melt a blob of solder in the tip

Hans, Thank you for the clarification!? Feedback is always a gift! 73 Evan AC9TU

Although I prefer L networks in nearly all antenna matching cases, they can’t be used to independently adjust phase through the network while performing an impedance transformation. The T tuner

IIRC the dialout" group is now the "uucp group in modern kernels?

Thanks for your input, Johan - I tried *sudo usermod -a -G dialout pi,* rebooted, and then did *groups pi* which returned: *pi: pi adm dialout cdrom sudo audio video plugged games users input netted

Hi Evan You are kind of correct... but the MOSFET isn't a perfect switch and this spoils the situation. If you want it to be a perfect switch then you have to keep the gate voltage AWAY from the gate

Robin, The QDX is a class D amp, not class E.? It shares similarities to Class E in that the PA devices are either on or off and are not supposed to be in the linear region.? I also believe that the

Correct

The recent topic(s) of antennas and matching systems reminded me of a classic error made in a publication that I was struggling to remember. I finally found it today. Secrets of RF Circuit Design

Martin, a class E amplifier uses a *switched* output stage (https://en.wikipedia.org/wiki/Power_amplifier_classes#Class_E and a QEX paper to be found at