DL1MMK's blog

This is a question to the WSPRnet community especially to K1JT.

Is it possible to measure the transmitting distance between a transmitter and receiver using the WSPR technique?

Dear DK8FT,

I am comparing the efficiency of my antenna system with yours DK8FT. For that reason I would like to know which antenna you are using in the 40, 30 and 20 m band.

Many thanks!

73, Mike DL1MMK

The graphical display of WSPR shows the short path from stations in Europe to Australia in the morning (at 7 a.m. UTC) for the 30 m band. However, I am convinced that these contacts were transmitted via the long path. The error in the graphical display and the distance error of the data base of WSPR should be corrected.

Best dx 73 Mike DL1MMK

WSPRnet opens up the possibility to measure the efficiency of my magnetic loop antenna (I3VHF, Baby, 1m diameter, direction 330 degrees), which stands on a balcony. Radiation in west direction (up to the zenith) is unobstructed in contrast to the east, south and north direction, where the antenna is near (1-2m) iron concrete walls with a hight of 10m. I compared the reception reports of my station (DL1MMK) with DG7RJ (distance 20 km), who uses a homemade Dipole 2*9m at 7.5m heights in SW/NE direction.

I just started with the WSPR technique. My computer input was connected with the output of my FT- 450 Yaesu transceiver, using an audio cable. I did´t have the microphone socket for the transceiver, for that reason I simply connected the output of the computer to my station loudspeaker and brought it near to the microphone. After turning on the Vox, the set up worked perfectly and surprisingly I got down to a reception SNR of 28 db at a distance of 8821 km. Not more than 20 min work! The antenna was a magnetic loop on my balcony. I find the new technique very fascinating.