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Electronics & Antennas for Ham Radio

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Noise is the New DX – The Urban Operator’s Guide to Misguided RX

Noise is the new DX

Once Upon a Time, Hams Climbed Trees and Strung Wires

They listened to whispers from continents away.
Signals danced across oceans, fluttering through the ionosphere into headphones powered by tube gear warm enough to toast bread.

Life was simple.
Antennas were wire.
And noise was something the mains filter actually helped with.

Now?

Now you fire up your rig in a sleek, IKEA-furnished urban QTH.
A sanctuary of laminated floors, LED lighting, and suspiciously chirpy appliances.

You press the power button.
The display lights up.
You tune to 7.074 MHz.

And you hear…

"BZZZZZZZZZT-PING-KRRRRRR-BLARP"

No, that’s not a contest station from Bulgaria.
That’s your neighbor’s solar inverter doing its morning yoga routine, your fridge negotiating with your router, and a phantom buzz from somewhere in the walls that may or may not be sentient.

Welcome to the future.
Where everything radiates.
And you've decided — heroically, stubbornly — to listen to all of it.

The Great Urban Lie: “My TX Antenna Works Fine for Receive.”

Of course it does.

Just like a chainsaw works fine as a butter knife.
You're cutting something, sure. Just not the toast.

It’s a 40 m end-fed.
Fed with 30 m of coax.
Beautifully stretched out across your urban balcony like a hipster clothesline.

And it receives.

Boy, does it receive.

  • The central heating’s whisper of doom
  • The harmonic screech of your neighbor’s Tesla feeding
  • The Wi-Fi-enabled toaster’s tragic love story with your dishwasher
  • And the forgotten ghost of a laptop charger left perpetually in standby since 2014

It’s all there.
A living, breathing electromagnetic zoo.
Curated by you.

But You Were Careful…

You bought the 49:1 balun.
With the good ferrite.
You installed a choke. You read blogs. You watched videos with thumbnails that screamed “THIS FIXED EVERYTHING!”

You clicked. You believed.
You installed.

And still, you listen to…

the boiler.

The Glorious Coax of Doom™

See, your antenna is technically “outside.”
But your feedline? Ah yes — it took the scenic route.

Right through your shack.
Past the smart meter.
Over the desk.
Under the LED strip.
Across the USB charger from a company called “HappyLife RF Succeed!”

And it picks up everything.
Your coax isn’t a feedline.
It’s an urban noise probe with connectors.

And every time you key up, it pretends to be a proper RF system.
But every time you listen, it whispers: “I know what your microwave did last night.”

“But Reciprocity!”

Yes. That sweet lie we tell ourselves.

If it can talk, it can listen.
If it radiates, it must also receive.

Just like if you scream into a megaphone, it means you can hear whispers through it.
Right?

You’re bathing in the divine symmetry of Maxwell’s equations while your shack quietly explodes with wideband EMI.

But don't worry.
Your transceiver faithfully decodes the phase-shifted sob story of your coffee machine negotiating voltage with the wall.

What a time to be alive.

The End Game

You sit back.
You sip your lukewarm beverage.
You stare at the S-meter, eternally glued to S9.

And you convince yourself — this is normal.
Just city noise. Just life.

Maybe everyone else is also listening to the same high-definition, wideband chaos.
Maybe it's not your setup.
Maybe the DX just isn't there.

But deep down, under the whine of your neighbor’s dimmer and your own laptop’s power brick… you begin to wonder.

What if…
Just maybe…

It’s not them.

It’s you.

Mini-FAQ

  • Does this mean I need a separate RX antenna? — If you live in an urban QTH and want to hear anything beyond the local EMI orchestra, yes.
  • Will chokes alone fix my noise? — No. They help reduce common-mode pickup, but your antenna choice and placement matter even more.
  • What’s the cheapest way to improve receive? — Build or buy a small, low-noise receive antenna and place it away from your house wiring.

Interested in more technical (or occasionally satirical) content like this? Subscribe to our updates for deep-dive RF articles, lab notes, and the occasional roast.

Questions or experiences to share? Contact RF.Guru — we’d love to hear your EMI horror stories.

Joeri Van Dooren, ON6URE – RF engineer, antenna designer, and founder of RF.Guru, specializing in high-performance HF/VHF antennas and RF components.

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