Specs, Signal Paths, and the Trouble with Reading Only the Headline
By the time a spec sheet, lab report, or PDF starts circulating widely in ham radio, it often stops being read and starts being repeated.
This issue is about what happens next: ferrite data reduced to slogans, transceiver lab tests treated like final verdicts, connector ratings taken literally, and transformer designs copied as if context did not exist.
The recurring lesson is simple: measurements matter — but only when you understand what they actually measure.
Ferrite Tolerances Aren’t One Thing
Material variation is real, but it does not reduce to one neat percentage.
This article explains which tolerances matter, when they matter, and why vague claims are not enough.
🔗 https://shop.rf.guru/pages/ferrite-tolerances-aren-t-one-thing
Where SFDR Shines
A useful reminder that no single performance number tells the whole story —
but in the right context, SFDR really does matter.
🔗 https://shop.rf.guru/pages/where-sfdr-shines
FPGA Doesn’t Repeal Physics
Modern DSP can do impressive things, but it cannot erase overload, bad front ends,
or the basic limits of analog RF design.
🔗 https://shop.rf.guru/pages/fpga-doesn-t-repeal-physics
Why Broadband RF Transformers Aren’t “Copy-and-Paste”
A transformer that works beautifully in one application can quietly fail in another.
Turns ratio alone never tells the full story.
🔗 https://shop.rf.guru/pages/why-broadband-rf-transformers-aren-t-copy-and-paste
Top of the Bottom: Why 160 Meters Is “Top Band”
A small historical and technical detour into one of amateur radio’s most stubbornly named bands.
🔗 https://shop.rf.guru/pages/top-of-the-bottom-why-160-meters-is-top-band
How to Read Transceiver “Lab Test Reports”
Useful data only stays useful if you know what the tables mean —
and what they do not mean once the radio leaves the bench.
🔗 https://shop.rf.guru/pages/how-to-read-transceiver-lab-test-reports
When “The Test” Becomes “The Truth”
One measurement, one setup, one conclusion… and suddenly it becomes doctrine.
This piece is about resisting that temptation.
🔗 https://shop.rf.guru/pages/when-the-test-becomes-the-truth
Going QRO?
Power makes weak assumptions fail faster.
Here’s what actually deserves attention before you simply turn the knob further clockwise.
🔗 https://shop.rf.guru/pages/going-qro
What Actually Limits Coax at QRO with High SWR
It is rarely just “the watts.”
Voltage stress, current, dielectric heating, and mismatch all get a vote.
🔗 https://shop.rf.guru/pages/what-actually-limits-coax-at-qro-with-high-swr
Why PL-259 / SO-239 Power Ratings Need Derating
Catalog ratings are one thing. Real installations, real duty cycle, and real mismatch are another.
🔗 https://shop.rf.guru/pages/why-pl-259-so-239-power-ratings-need-derating
OS5Z “Dreamer” Antennas
A practical station example that reminds us that real performance comes from the full system,
not just a neat headline number.
🔗 https://shop.rf.guru/pages/os5z-dreamer-antennas
LORAN: Why It Still Matters to Ham Radio
Old systems still have lessons to teach.
This one connects legacy navigation thinking with modern amateur-radio perspective.
🔗 https://shop.rf.guru/pages/loran-why-it-still-matters-to-ham-radio
“Voltage-Fed” Antennas Aren’t Inherently More Dangerous Than a Dipole
Another example of a claim that sounds technical until you ask what it is actually comparing.
🔗 https://shop.rf.guru/pages/voltage-fed-antennas-aren-t-inherently-more-dangerous-than-a-dipole
Where DL4ZAO’s “Balun” PDF Derails
A careful look at where a widely cited document stops helping and starts misdirecting.
🔗 https://shop.rf.guru/pages/where-dl4zao-s-balun-pdf-derails
Sevick’s Transmission Line Transformers, Re-Read in 2026
Still essential, still worth reading, and still one of the few references that rewards being studied properly.
🔗 https://shop.rf.guru/pages/sevick-is-still-the-transformer-book
Prefer watching measurements and explanations instead of arguing about screenshots and spec tables?
Mark dives into many of the same RF topics with calm clarity, practical demonstrations,
and zero tolerance for hand-wavy mythology.
🔗 Watch the featured videos from our collaboration
If this issue leaves you slightly more cautious around clean-looking charts, absolute claims, and copy-pasted transformer advice — good.
That is usually where better RF decisions begin.
73,
Joeri – ON6URE
Founder – RF.Guru
https://rf.guru/