I just finished a round of testing two 40 meter 1/4 Verticals with 8 Radials. The difference was the antenna height as well as the ground plane orientation. The results were fairly dramatic at around a 3db delta . The one question I had was how close in output power are the 2 WSPRLITES and just exactly what power level you are transmitting. I am pleased to report that the 2 units are dam near the same levels! For the record .....
WSPRLITE labeled "LDP"
Freq set to 200mw ( +23 dbm ) set to 5mw ( +7 dbm )
160m 24.4 dbm 11.0 dbm
80m 24.6 dbm 10.8 dbm
40m 23.9 dbm 9.9 dbm
30m 23.4 dbm 9.1 dbm
20m 23.3 dbm 9.6 dbm
WSPRLITE labeled "IMI"
Freq set to 200mw ( +23 dbm ) set to 5mw ( +7 dbm )
160m 24.6 dbm 10.4 dbm
80m 24.5 dbm 10.2 dbm
40m 24.0 dbm 9.4 dbm
30m 23.4 dbm 8.6 dbm
20m 23.2 dbm 9.0 dbm
At the 200mw setting the output power is accurate within 1.6 db. The 5mw output saw a much bigger discrepancy up to 4 db.
At the 200 mw power output power difference between the 2 units is less 0.2 db ....WOW!
So now if I only knew my coaxial cable losses ....if I am anywhere near spec on the LDF4 its rated at around 0.2 db / 100 feet so the antenna on the top hill looses about 1 db at the HF frequencies. and at the bottom its about 0.4 db.
No comments:
Post a Comment