Author profile

Margaret Hale

Editor, RF and microwave components

Editor of MicroSource Insights. Sets the sourcing standard each guide is held to, and owns the correction path when a published claim proves wrong.

What I do here

I check that quoted specifications match the primary documents they came from, and I decide what we publish, what evidence a claim needs before it goes out, and what happens when we get something wrong.

Most of that work is unglamorous. A datasheet figure gets quoted without its measurement conditions. A tuning range is stated as though it were guaranteed over temperature when the source only gives it at 25 °C. A comparison declares one part “better” without saying better for which constraint. Those are the errors that survive a casual read and mislead someone sizing a real design, so they are the ones I look for.

What a guide has to clear before it publishes

  • Every specification traces to a primary document — a manufacturer datasheet, a standard, or published measurement — and the conditions come with it.
  • Comparisons state the constraint they are optimising for. “It depends” is not a conclusion; if a page cannot say what it depends on, it is not finished.
  • Where a number is a typical value, a limit, or our own inference, the text says which.
  • Nothing implies first-hand testing we have not done.

Corrections

If something here is wrong, tell me. Send the page URL, the sentence you are disputing, and a source I can check, to the editorial address in the footer.

I will fix the specific claim first and look at what else it affects second. A correction that quietly changes a conclusion without saying so is not a correction.

Published work

Articles by Margaret

yig technology

How YIG Oscillators Work

A YIG-tuned oscillator is a negative-resistance active device locked to a magnetically tuned resonator, with a coil driver doing most of the work you actually specify.

signal chain

RF, IF and LO Explained

The three frequencies in a heterodyne receiver, why the image sits 2 × IF from the wanted signal, and how that plan decides the preselector and the local oscillator.

signal chain

Upconverter vs Downconverter

Downconverters translate RF to a lower IF; upconverters translate IF to RF. Same mixing identity, opposite direction — the unused product is a frequency-plan problem in both.

yig technology

YIG Filter vs Cavity Filter

Use a YIG-tuned filter when the passband must move and stay a roughly constant absolute width. Use a cavity when the band is fixed and insertion loss or power handling binds.

yig technology

YIG Oscillator vs VCO vs DRO

When a YIG-tuned oscillator, a varactor VCO or a DRO is the right microwave source — decided by tuning range, hop speed and close-in phase noise, not by a headline dBc/Hz figure.