WSPR 630m (472 - 479kHz) band activity data recorded for 4 x 24 hour period on the 21/08/2017 -  24/08/017 UTC

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Data from the WSPR web site relating to monitoring and transmission from VK6YSF Northam Western Australia.

WSPR Frequency: Dial 474.2 kHz USB (occupied bandwidth 475.6 - 475.8 kHz)

Grid location: OF88II

Local Time = +8:00 hours (0:00 = 8:00AM)

RX Only

SSN (Sun Spot Number): 29 - 32

Equipment: TS-930 at 5W, Radio computer interface

Antenna#1: Active Antenna V-1

Antenna#2: Active Antenna V-2

This exercise was to compare two versions of the PA0RDT compact active antennas. Antenna#1 was the original designed slightly modified to take advantage of more easily available transistors. Antenna#2 is the PA0RDT compact active antennas constructed with originally specified transistors.

WSPR 630m band activity data recorded for 4 x 24 hour period on the 21/08/2017 -  24/08/017 UTC showing SNR against UTC time, Vertical axis = dB below the noise floor. 

Antenna#1: Active Antenna V-1 (ORANGE)

Antenna#2: Active Antenna V-2 (BLUE)    

The below additional pings are as result of VK4YB reducing power from 5W to 0.5W at various time over the four days.

Antenna#1: Active Antenna V-1 (YELLOW = 27dBm 0.5W)

Antenna#2: Active Antenna V-2 (Grey = 27dBm 0.5W)

WSPR 630m band activity data recorded for 4 x 24 hour period on the 21/08/2017 -  24/08/017 showing distance in km against UTC time. Vertical axis = km

Antenna#1: Active Antenna V-1 (ORANGE)

Antenna#2: Active Antenna V-2 (BLUE)

WSPR data has been graphed using Excel. Horizontal axis = UTC Time, Vertical axis = dB below the noise floor.

Antenna#1: Active Antenna V-1 (ORANGE)  21/08/2017 -  22/08/017 UTC

Antenna#2: Active Antenna V-2 (BLUE)       23/08/2017 -  24/08/017 UTC

VK3HP VIC, AUSTRALIA

Distance: 2679km

Grid location: QF21nt

dBm: 30 1W

WSPR data has been graphed using Excel. Horizontal axis = UTC Time, Vertical axis = dB below the noise floor.

Antenna#1: Active Antenna V-1 (ORANGE = dBm: 37)  (GREY = 27dBm 0.5W)      21/08/2017 -  22/08/017 UTC

Antenna#2: Active Antenna V-2 (BLUE = dBm: 37)       (YELLOW = 27dBm 0.5W)  23/08/2017 -  24/08/017 UTC

VK4YB QLD, AUSTRALIA

Distance: 3523km

Grid location: QG62ku

dBm: 37 (5W) and 27dBm (0.5W)

WSPR data has been graphed using Excel. Horizontal axis = UTC Time, Vertical axis = dB below the noise floor.

Antenna#1: Active Antenna V-1 (ORANGE)   21/08/2017 -  22/08/017 UTC

Antenna#2: Active Antenna V-2 (BLUE)        23/08/2017 -  24/08/017 UTC

VK5ABN SOUTH AUSTRALIA

Distance: 2097km

Grid location: PF94lw

dBm: 33 (2W)

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Page last revised 09 December, 2025