LF Explorers,
For several days K3RWR broadcast a 13 character EbNaut message of 14m 58s
duration at power levels ranging from +7 dBm ERP to -13 dBm ERP on 137479 Hz.
The primary intent was to test QRPp on LF. Listening and decoding were Jay
(W1VD - 304 mile / 487 km path) and Garry (K3SIW - 662 mile / 1059 km path).
Both Jay and Garry reported multiple decodes over the several days at QRPp
power levels ranging between 0 dBm to -13 dBm ERP. Examples include:
W1VD - Regular decodes at -13 dBm (50 uW) ERP including 3 at mid-afternoon.
Typical:
Rank 0 car EB/N0 9.6 EB/N0 8.5 -13 DBMERP_LF
K3SIW - Regular decodes at 0 dBm (1 mW) ERP. Typical:
Rank 0 car Eb/N0 6.5 Eb/N0 4.0 0_DBM_ERP_LF!
This brief experiment demonstrates QRPp possibilities on LF and highlights the
capabilities of EbNaut as a weak signal mode. Further experimentation welcome.
73,
Rob - K3RWR
FM18qi
|
