Well, we strive for perfection, but sometimes we miss. The question committee released a very late, second set of corrections that we failed to incorporate in the early editions of the new Extra course. Because once things start to unwind, they seem to become determined to unwind more, the distributor for the audio program, trying to substitute our corrected audio, created a hopeless mess. The corrected 2020 audio, is where the old 2017 audio should be, and the uncorrected audio is still in the 2020 slot. Changes there are taking months because they are overwhelmed with submissions due to the lockdowns. Who’d have expected that?
In any case, if you would like fresh, corrected audio, for now, buy the old audio edition.
Print and e-book editions are all corrected. If you have a Kindle edition with errors, just delete the book from your device and re-download it.
- E3C09: They actually had this one wrong in the last question pool, and we didn’t fix this in the first edition of the new one. An X3 flare is 50 percent greater than an X2, not twice as great as they said in the last pool.
- E4D06: The correct answer is “intermodulation” not “intermodulation distortion.”
- E4C10: I don’t remember what was wrong about that one, but the correct answer is “Receive bandwidth can be set to match the modulation bandwidth, maximizing signal-to-noise ratio and minimizing interference.”
- E4C08: An SDR receiver is overloaded when input signals exceed the reference voltage of the analog-to-digital converter.
- E8C10: Data rate may be increased without increasing bandwidth by using a more efficient digital code. The old version said “symbol rate.”
In the explanation of E5B03 (converting an impedance in polar form to an equivalent admittance) the impedance of the example circuit is about 1000 ohms and the admittance is 0.001 siemens with a phase angle of +14 degrees.
Our apologies!
