Solar powered WSPR fun with 0.000085 watt (85 uW)

W4ATV is an experimental solar powered sub-mW WSPR beacon located in Madison, Alabama (EM64). It is capable of outputting either 1000, 500, 250, or 85 uW on 30m. Power output was verified using a calibrated HP-432A power meter and GIL-360-2 bolometer mount. The antenna is 5.5m vertical with 24 1/4 wavelength buried radials. An antenna with a higher radiation angle would probably produce more spots.

The following stations received the 85 uW signal (21SEP - 26OCT14):
Callsign - Km
KD0HFC 1299
KB9AMG 952
KD6RF 734
WD4ELG 677
ND4XE 534

The following stations received the 250 uW signal (7-21SEP14):
Callsign - Km
KB3LSM 939
K0VM 936
KD6RF 734
K9AN 633
WB4HIR 574
AK4DW 344

The following stations received the 500 uW signal (17AUG-7SEP14):
Callsign - Km
KD0HFC - 1299
W3GXT - 1066
W3CSW - 1023
N3DT - 936
KD6RF - 774
KV0S - 697
AJ8S - 656
W0BTU - 634
K9AN - 633
AI9K - 523
AK4T - 264

Although the results of the informal experiment do not reflect any sort of record, they are a testament to the capabilities of the receiving stations and the effectiveness of WSPR.

W4ATV is the callsign of the Tennessee Valley Amateur Television club. For additional information contact W3PM.