DL9LBG WSPR transmitter
July 21st: DL9LBG is not whispering today - sometimes I prefer man made cw operation.
This webserver and the WSPR generator/decoder (Weak Signal Propagation Reporter) both work on a Raspberry Pi mini computer located in Lütjenburg/North Germany (Locator JO54hh).
Currently DL9LBG whispers on 18.106178 MHz (17 m band) with a tx fraction of 20 % (transmitting approx. every 12 minutes).
The WSPR software by K1JT is running on a Raspberry Pi which is connected via a cheap USB audio dongle to an FT-857D which produces about 2 watts (33 dBm) hf output. The antenna is an endfed wire with a length of 20.4 meters, about 18 meters up from the ground. I use this antenna normally on 80 m (one quarter wavelength) but it also works quite well on 12, 17 and 30 m without any tuning. The water tap in the nearby kitchen is connected for grounding.
WSPR transmitter plus webserver on one mini computer and the power input is only 3.5 watts. Good power efficiency, I think. On this old Raspberry Pi 2 additionally an MMDVM-DVMEGA does a good job as a local DMR-/C4FM-YSF-Hotspot on 433.675 MHz (WSPR and webserver take few ressources, there's enough mem and CPU-power left for MMDVMHost).
Pse QSL to michael [ät] dl9lbg.de - tnx!
SWL reports will be confirmed via QSL bureau, eQSL or QRZ.com postal address.
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