← Back to the radar

ClassD-VHF-Transmitter – Covert RF Transmission via Phone Speaker PWM

github.com · 1 day on the radar

RISING
Where is the demand coming from?
Mixed
Some genuine outside demand, some founder reach. This is the read that decides whether the traction would transfer to you.
Roughly what does it earn?
Not disclosedNo basis to estimate
We do not publish a figure until we have something to base it on. When we do, the method that produced it is shown alongside the range.
Could you build it?
Yes, in about 2 weeks
Nothing patented, no network effect, and no proprietary data set standing in the way.

What it is

An experimental Android proof-of-concept that exploits Class-D amplifier PWM harmonics to transmit VHF signals via smartphone speaker coils without special permissions. The app synthesizes inaudible ultrasonic pulses to modulate RF emissions detectable on amateur radio bands, demonstrating a novel TEMPEST side-channel attack.

The one thing to knowThis is academic/hobbyist security research with no commercial path, minimal traction, and regulatory/legal exposure that makes fast-following strategically pointless for a venture studio.

Proof we found, with sources

HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source
HNThe Show HN post reached 1 points on Hacker News.23 Sept 2026 · source

The scores behind the verdict

Directional reads from public signals, 0 to 100
▸ Show the four scores
TractionWeak5 / 100
How much demand shows up from people outside the founder's own circle.
CopyabilityFair45 / 100
How feasible it is for a competent builder to ship something comparable.
Wedge potentialThin15 / 100
How much room is left for a new entrant: gaps, ignored segments, pricing openings.
MonetizationUnproven0 / 100
How much evidence there is that people actually pay: visible pricing, revenue claims, a paid tier in use.

Unlock the full brief

How it works under the hood, how it gets customers, where it is weak, and the opening we would take, with a bottom-line verdict.

Sign in to unlock
One-time payment. Delivered in about a minute. Yours to keep.

Revenue, user and tactic numbers are evidence we found and attributed, with a confidence rating.
They are directional reads, never verified guarantees.