Воскресил старую ветку форума правда для 1296MHz.
What power you need for 1296MHz-EME-QSO?
Tested by Peter Cerveny, EA6ADW (DF5JJ)
with real echo tests (5.5m-dish, power range 1W to 1000W)
Many echo tests with calibrated AGC-voltage (S-Meter) gave following results.
All power values are effective at feed! Power range of tests were 1W up to 1000W, antenna 5.5m-dish, 0.30dB-LNA, 250Hz-bandwith.
Gain Dish ERP Ptx --- for 3dB-echo in apogee
dBd D (m) (kW) (W) nf=0.3dB, (250Hz-BW)
40.8 12 ------------------------ 16 1.3
40.0 11 ------------------------ 19 1.9
39.1 10 ------------------------ 23 2.8
38.1 9 ------------------------ 29 4.5
37.2 8 ------------------------ 36 7.0
36.1 7 ------------------------ 46 11
34.7 6 ------------------------ 64 22
34.0 5.5 ------------------------ 75 30 Antenna EA6ADW(DF5JJ)
33.1 5 ------------------------ 92 45
31.1 4 ------------------------ 146 113
28.5 3 ------------------------ 266 375
25.1 2 (4x55el) ------------- 582 1800
18.3 1 (2x26el) ------------- 2786 41000
examples:
5.5m-dish: own echo (3dB) with 30W = 75Werp
5.5m-dish: QSO with 2m-dish, Gain 34dB - 25dB = 9dB , consequently Ptx=30W+9dB=240W for both stations
2.0m-dish: own echos with 1800W!