WSPR - Weak Signal Propagation Reporter Network

“The Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT’s MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions.”


On the 8th July, 2013 we installed special customised firmware into our existing 30m (10MHz) QRSS transmitter at the Martello Tower which allows us to run QRSS and WSPR in the same ten minute frame so G0PKT now transmits a two minute WSPR signal starting at 08, 18, 28, 38, 48 and 58 minutes past the hour followed by eight minutes of QRSS.


The output power on 30m is around 150mW to a half wave dipole strung out at the top of the Martello Tower.  The dipole is simply a pair of 7.1 metre legs with a balun in the centre and RG58 coax leading back to the transmitter in the shack.


On the 17th September 2013, we added a 10m WSPR transmitter running 300mW output into a 5/8 vertical mounted on top of the tower, roughly 40’ AGL.


We hope that by providing an ‘always there’ signal that we will be useful for propagation testing for stations around the world.

Martello Tower Group, 2009-2020