Common Mode Chokes for RX Antennas


Challenged by the QRM picked up by my omni directional active RX vertical when trying to work TL8TT on Topband, I decided it was time for a directional RX antenna pointing south in addition to my N/W and N/E Pennants. I had a transformer and termination resistors collecting dust so I decided to throw out some wire to make a short BOG, Beverage On Ground. Since I didn’t have any proper common mode chokes at hand I just wound about 10-12 turns of the coax around a FT-240-31 core. How does this quick fix compare with a proper RF choke? Read more ›

CQ 160 CW Soapbox

CQ 160 is one of my favourite contests. The goal this year was set to break the SM record in SO-HP Assisted. In addition I also wanted to beat my own score from 2010 in SO-HP (unassisted). Reasonably well prepared, somewhat rested and with the gear in shape I was ready to take on the challenge. This is the story of SE0X in CQ 160 CW 2017, keep on reading to see if I succeeded in hitting my goals. Read more ›

K3 at SE0X gets major upgrade

K3 KSYN3A Upgrade OK

The Elecraft K3 transceiver at SE0X is an early first batch model. It was ordered within days from the K3 announcement at the Visalia DX convention 10 years ago. Many improvements has been introduced over the years and most of them have been implemented in our K3. Read more ›

SE0X CW Skimmer Back Online

SE0X Skimmer

Our CW skimmer is finally online again after a series of both software and hardware problems. It all started with with Windows automatically upgrading to Win 10 which lead to network problems. The WiFi link was replaced with Ubiquity equipment which seemed to cure the problem. Read more ›

Remind me again…

Why am I always working on antennas in November, right at the start of the wet and windy season!


Posted the above video on Twitter. I have to admit it doesn’t look as dramatic when seen on video, but when below the tower the beams swing back and forth like a mobile whip on the highway. Read more ›

Keeping your competition on a distance

Screen Shot 2015-07-13 at 14.00.23This is a grim example how to keep your competition on a distance! I won’t mention calls, but this screenshot is from the IARU HF contest this past weekend and this is a HQ station. If you look closely to the waterfall display you notice the splatter lines at least 30 kHz down. Read more ›

Multi-One Low Power in WPX SSB

WPX SSB a year ago, in 2014, was a success for SE0X. Propagation was fabulous and we where able to set a new SM record in the Multi-Two category. This year we wanted to try something new and decided to enter in Multi-One Low Power where there presently is no Swedish record. Reaching the current EU record would be a stretch with the current propagation, but we like a challenge so we chose this as our goal. Read more ›

QRP action in CQ-160 SSB!

Working a 160 meter contest QRP is much more fun than you might think! A few weeks ago I worked the CQ-160 SSB contest using 5 watt QRP power. I logged more than 200 QSOs and the claimed score is almost half the number of my SM Low Power record and more than a third of my High Power and High Power Assisted records. Read more ›