G/Ta, G/Tsys and SNR of own EME echo signals

2m & 70cm discussion - antennas, propagation, operating, etc
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UR5EAZ
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Joined: Sat Mar 29, 2014 4:41 pm

G/Ta, G/Tsys and SNR of own EME echo signals

Post by UR5EAZ » Fri Nov 15, 2019 2:15 am

Hello all,

Please look at the attached file.
XLGTa_Application_v2.b.xls
(353.5 KiB) Downloaded 11 times
The interactive table contains 200 single Yagi models.
User input: Sky Temperature, Earth Temperature, Bandwidth, Path Loss, Pin, Receiver NF
I show the importance of SNR of own EME echo signals (instead of G/Ta.).
Of interest are SNR vs G/Ta and SNR vs G/Tsys. The more positive the numbers, the better.
One example of model comparison:
KF2YN BK-7 (L = 2.741m). G/Ta = -8.1 dB/K, G/Tsys = -9.4 dB/K, Echo SNR = -21.8 dB.
DK7ZB-7-UWB (L = 2.780). G/Ta = -12.1 dB/K, G/Tsys = -13.2 dB/K, Echo SNR = -28.7 dB.

KF2YN BK-7 vs DK7ZB-7-UWB:
delta G/Ta = 4 dB, delta G/Tsys = 3.8 dB, delta of Echo SNR = 6.9 dB.

How do you rate this table for choosing an antenna model with EME SNR instead of the G/Ta (ratio of antenna gain to antenna temperature)?

Vladimir, UR5EAZ.
Attachments
Application_XLGTa_v2.b.rar
(57.08 KiB) Downloaded 9 times

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