For antenna selection, the IAT Interactive Antenna Table demonstrates the superiority of the G / T concept over the G / Ta concept.
In the G / T concept, an antenna (with external noise) is considered as an integral part of a radio receiving system, which, in addition to an antenna (with external noise), contains a transmission line and a line receiver. The transmission line is connected between the antenna terminals and the receiver input and contains all the necessary system components (cables, dividers, relays, connectors, etc). The receiver may contain a line LNA (see the diagram).
In contrast, the G / Ta concept does not consider an antenna with external noise as part of a radio receiving system.
So, the IAT compares both concepts.
For example, the antenna (boomlength = 7.800 m) on G / Ta is worse than other highlighted models. But, according to the G / T parameter, the?antenna (boomlength = 7.800 m)?has an advantage over these antennas (see the images GT_vs_GTa and GT_vs_GTa_2 ). In addition, the IAT has the most important C / N score for two-way EME QSO. It is best to use this parameter to select an antenna.
Thus, the IAT shows that G / T and C / N parameters are most preferred for antenna selection.
With the IAT, the user can simulate their own radio receiving system and automatically receive calculated results for antenna selection. For this, the IAT has cells for user input:
'Sky Temperature', 'Earth Temperature', 'Transmission Line Loss' and 'Receiver Noise Figure". Also, on a separate worksheet, you can see helper calculators.They will help the user to quickly model the radio receiving system.
The IAT Interactive Antenna Table will be updated with other antennas.
With courtesy, this content has downloaded from the email exchange server of EME stations - Moon-net Digest, Vol 517, Issue 3 published on 13.4.2021
For ham radio use only!