Klaus’ website: https://bpmsg.com
A couple of weeks ago I started to gather my first experiences with software defined radios (SDR) and active antennas. I started with low investment, using the RTL SDR dongle, but I quickly realized that using the direct sampling mode for HF is not an ideal solution and added the Spyverter HF up-converter.
For my first trials I used a Mini Whip from RA0SMS as antenna, but the results were quite disappointing.
Finally, I ended up with an active loop antenna (see featured image), using the Cross-country Wireless Loop antenna pre-amplifier (10 kHz to 30 MHz version). The pre-amplifier is powered with 13.8 V via a bias-tee. Common mode chokes on the antenna line and all power lines helped to reduce noise, especially on the low bands. This is final hardware setup setup:
The setup is now running 24/7 on a Raspberry Pi 3B+ using GQRX and WSJT-X. I was surprised, how many stations and countries can be decoded down to 80 and 160 m.
PSK reporter link to stations currently received by 9V1KG
CQ WPX over … stn closed. Poor propagation, could not improve from last year. But 850 qso and 700k points in low power is also not bad. 🙂 4E1A
Last weekend I participated in the CQWW DX contest SSB part under the call sign 4E1A. Propagation was miserable on 40 m and 80 m; with my 100 W low power I was seldom heard by DX stations in EU or NA. On 20 m and 15 m propagation was acceptable, and I got even some openings on 10 m. Finally, I could exceed my points from 2018 and made 852 contacts with 62 DXCC entities and in 30 zones.
Raw score: 2287 QSOs x 191 multipliers = 436817 points.
- Date: June 13, 2020
- Time: 11 am to 8 pm (Registration starts at 10 am.)
- Location: Pacita Astrodome, Phase 1-C Sto. Rosario Drive San Pedro, 4023 Laguna (see Map below)
- Fees: 700 PHP per participant
Online registration is open now! Please register here. Fees are 700 Pesos per participant and additional donations are always welcome. After your registration you will receive a confirmation email. Please transfer the amount due to the following account:
- Account name: Normita D Torres or Violeta T Rivera or Emil L Virtudes
- Account number: 1599-5781-33
- Bank: BPI
- Branch: BPI ATC Alabang
Looking forward …
Surprise in the mail: plaque for CQ WPX CW contest 2018
Finished the setup of my portable station. All components are mounted together using maker beam profiles: FT-818, PA MX-P50M, ATM Z817, Solar charge controller and Computer interface.
The results for the CQWW WPX Contest 2018 are out for CW and SSB. I was able to achieve in both modes #1 in the Philippines for all bands, low power. In CW, first time ever, I became continental winner for Oceania.
Equipment: IC-718, 100W, Inv. Vee dipole for 40 and 80 and 3 el Spider beam for 15 m and 20 m. For 10 m I just matched the Spider beam with a matchbox.