On this page a description of my 40 MHz station and the reception reports. The station was ready in March 2021. At the beginning of May I started actively monitoring this band.
The last year there has been increasing interest in the 8m band. For example, a number of beacon transmitters are active and in an increasing number of countries amateurs have received permission to conduct experiments on this band. The 8m (40 MHz) is interesting for ionospheric radio research because it fills the gap between the 10m (28 MHz) and 6m (50 MHz) band.
The frequencies where there is activity depends on the permission per country. This can be between 40 and 41 MHz. It seems that most station activity is concentrated around 40,680 MHz. The beacons have their own frequency.
The antenna is a tuned dipole at 40 MHz. The construction can be seen in the photos. The antenna is occasionally mounted on a mast at a height of 4m. Usually polarized horizontally.
For the receiver I use an SDR with a band filter + premap in front of it. I also have a ready-made 40 to 28 MHz transverter that I usually use lately. The rear set can then be my traditional HF receiver or an SDR.
40 MHz Dipole antenna (with 2m yagi)
40 MHz converter to 28 MHz
Dipole feedpoint with 75 to 50 Ohm 1/12 wavelenght coax pieces as transformer
and wound to act as a current choke (more or less).
Dipole reflection attenuation
2021-05-08 EI1KNH/B 40.013 MHz
2021-05-08 S55ZMS/B 40.670 MHz
2021-05-08 EI7HBB 40.680 in SSB
2021-05-08 S57RW 40.680 in FT8
2021-05-14 S5/M0MPM 40.675 in FM
Latest 40 MHz spots
40 MHz dxspots latest 4 hours
EI1KNH/B, IO63VE, 40.013 MHz -> QTF: 288 QRB: 813 km
EI1CAH/B, IO53CK, 40.016 MHz -> QTF: 288 QRB: 1053 km
OZ7IGY/B , JO55WM, 40.071 MHz -> QTF: 41 QRB: 626 km
S55ZMS/B, JN86CR, 40.670 MHz -> QTF: 119 QRB; 947 km
ZS6WAB/B, KG46RB 40.675 MHz -> QTF: 158 QRB: 8676 km
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