Have you ever thought I would really like to know what the cat gets up to during the day? No, OK its just me then. Anyhow, I was surfing one of the many ChinaBay websites the other evening and spotted a rather cheap “Pet tracker”. Marked as D69 Pet Locator, the advert suggested it could […]
LF and MF reception in an urban environment
SW listening and the ability to receive stations many thousands of miles away on HF has always fascinated me. Reception on HF, more especially LF and MF has always been a challenge due to the high urban noise floor. The doublet antenna at home while working well on 7 to 30 MHz, is a poor […]
Oak Hills Research QRP RF Power Meter (WM-2 QRP)
The Oak Hills research produces a very nice QRP power meter kit, the RF power meter WM-2 QRP is produced with a high-quality case and silkscreened and masked PCB and a large moving coil meter. Meter Highlights Operates from 300 kHz to 54 MHz Measured power range from 100 mW to 10W FSD with an […]
Ultimate 3S QRSS/WSPR project (Part 1)
Welcome to Part 1, this covers the initial build of the U3S, Part 2 covers the addition of the LPF relay board. Some month ago I purchased a Ultimate 3S QRP transmitter from QRP Labs. The latest version is the ultimate 3S and it comes with a number of options. Over the christmas holidays I decided […]
RSGB Christmas Cumulative Contest
The RSGB have a series of Christmas Cumulative contests covering 50/70/144 and 433 MHz. The contest is a chance to put down that turkey sandwich and head out to play some radio in the winter sun. The contest run for 2 hrs, and activity is over 4 days. You can read the rules online, and […]
Decoding HF ACARS – ARINC 635 (HFDL)
NOTE:- It has been recently discussed on the UDXF Yahoo group that Sorcerer is using an old freq/site list – you may get correct decodes, but not correct site IDs. One option is to consider some of the other methods of decoding ARINC on this page. This article was updated on 28/11/17 to reflect some changes […]