0

The Heyphone – A Radio Designed Specifically For Cave Communications

Heyphone

For the Thailand rescue of the children’s soccer team, it appears they were aided by a device invented by a UK Ham Radio operator.

The “Heyphone” is a voice radio designed by John Hey, G3TDZ, as open-source hardware specifically for cave rescues. It uses upper (single) sideband voice on 87 kilohertz in the LF (low frequency) band.

The antenna consists of two stakes driven into the ground about 20m apart. Enough of the current between them fringes outward to couple to another antenna up to a few hundred meters away (or down).

John Hey passed away in 2016 so he didn’t get to see his work used here. But he made a difference in this rescue and perhaps in many other cave explorations. Thank you John!

You can read all about the Heyphone and other cave communications recommendations on the UK CREG Website.

Thanks to Phil Karn via Facebook and Star Simpson via Twitter for the info!


Join 7,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython in 2018 – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — American startups are having an increasingly smaller share of the market

Wearables — A bevel illusion

Electronics — Don’t float!

Biohacking — Optimizing the Warm Up

Python for Microcontrollers — CircuitPython 3.0.0 released!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



3 Comments

  1. Heyphone radio, could be a blessing to work in such a low frequency. Wonderful invention.

  2. Not sure who the author of this article is, but would you have any links to blueprints for making one of these from scratch? Any help would be much appreciated. Thanks!

  3. You can find out about building the original Heyphone at http://bcra.org.uk/creg/heyphone/documentation.html. NOTE: the British Cave Rescue Association is recommending newer devices: Ian Cooper’s Micro HeyPhone, which was described in the CREG Journal in 2017, Système Nicola, and Cave-Link) but these last two are semi-commercial products and not available for home construction. SO perhaps check out the design of the Micro Heyphone in that journal?


Leave a comment

Adafruit has a "be excellent to each other" comment policy. Help us keep the community here positive and helpful. Stick to the topic, be respectful of makers of all ages and skill levels. Be kind, and don't spam - Thank you!

Prove you are human by reading this resistor:

0Ω+/- 5%

0
0
1
2
3
4
5
6
7
8
9

0
0
1
2
3
4
5
6
7
8
9

0
0
1
2
3
4
5
6
7
8
9

5
5
10

Prove you are human by reading this resistor:


Match the sliders on the left to each color band on the resistor.

Click Here for a new resistor image.

New to electronics? Click here to learn how to read resistor values.

Or learn to read resistors by playing Mho's Resistance!