Issue 211 July 14th, 2018

Ham radio technology used in Thailand cave rescue
UK radio amateur John Hey G3TDZ (SK) designed the special low frequency radio equipment, the Heyphone, used in the recent cave rescue in Thailand.
Southgate

SDR: Direction finding techniques 
Public KiwiSDRs distributed around the world can be used to pinpoint the physical locations of any 0 - 30 MHz transmitter using the TDoA technique.
RTL-SDR

New: No Nonsense Amateur Radio Podcast
The No Nonsense Amateur Radio Podcast is a discussion of where we are in amateur radio and where we’re going. It is a production of Dan, KB6NU, and Tom, KB5RF.
No Nonsense Podcast

A short guide on baluns
Unless precautions are taken to minimize it, all coax fed antennas will have significant current flowing on the outside of the coax shield while transmitting.
Surrey Amateur Radio Club

ARRL contest award certificates now available for download
This new online certificate feature will offer enhanced content over what has been offered previously on ARRL certificates.
ARRL

88 MHz Trans-Atlantic signals heard in Ireland
Northern Ireland managed to hear a Canadian radio station across the Atlantic at 88 MHz.
EI7GL

W6/NC-353, Burdell Mountain – 2018
I did this summit late last year as my first morse code activation. Last time it was a combo POTA/SOTA activation. This time would be only SOTA. And it was a heck of a lot warmer too!
KE6MT

Shortwave radio listening continues its steep decline
Shortwave audiences are virtually disappearing in Pakistan, and down substantially in Nigeria.
BBC

3D printed 10KV tuning capacitor
I will show you how to build a super-cheap tuning capacitor that will tolerate up to 10,000 Volts of RF and allow you to use up to about 100 Watts of RF into my 14MHz (20m) antenna.
The SWLing Post

Directive Systems 2 Meter Rover Yagi
With an 8 foot boom, it’s just the right size to fit on the roof of my SUV for transport and works great on the fiberglass push-up mast.
K5ND

Make your own LED battery level indicator
In this video I will show you how we can use the classic LM3914 IC to create an LED Battery Level Indicator.
YouTube