DG7YBN / Ant.-Soft / Antenna G/T Calculators by F5FOD
  Last Update May 21th 2017


Basic Program AGTC_lite
Basic Program AGTC  - NEW -
MS Excel Calculators
FFTab to MS Excel Loader

Antenna G/T Calculating Software by F5FOD with DG7YBN


As conceived the Antenna Temperature concept is meant for terrestrial-to-space communication. It is a theoretical concept using a model environment. The Antenna under Test (AUT) is enclosed in a lower hemisphere (T-earth) and a upper (T-sky). The Y-factor = T_hot / T_cold shows that T-ant becomes useful for antenna optimisation at above approx. 70 MHz. In Antenna Simulation Software we can adjust pattern computation step size in degrees. The little patch enlighted in the sky hemisphere (in sketch on left) is one of the resulting step size patches. The example shows just a single patch in straight main beam direction. Actually both hemispheres are clad with patches all over. Each of them shines onto the AUT's pattern with a brightness temperature. Depending on the hemisphere, the patch which belongs to this is either T-earth or T-sky. The AUT's radiation pattern holds the gain coresponding to each patch, starting with a normalised 0 dB in beam direction and likewise -24 dB for a side lobe. Now the pick up of noise power per patch is summed up, averaged over the full sphere and expressed in Kelvin. This is the AUT's antenna temperature.


Same in explicite for calculating Antenna Temperature Ta, sketch: F5FOD

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The Antenna G/T Calculators project AGTC is built around two completely different methodological methods:
 • Without mathematical rotation: AGTC_lite
 • With mathematical rotation: AGTC and AGTC_fast

In each case, you can use two different tools:
 • a program
 • a Far Field table feeder azel plus a Microsoft Excel® work sheet.

All the program source codes are free and fully available. They are very documented so you may rewrite them in any language and interface you want.

This website is growing as the project grows! You will find full source codes for Download and also Excel® sample calculation sheets for Antenna Temperature and G/T below as soon as these are ready and validated.


• Antenna G/T Calculators with Open Source Code, F5FOD with DG7YBN, Dubus 1/2017 and 2/2017

AGTC_lite, a DOS Console program

The AGTC_lite DOS Console program is developed in Basic. The .exe file is compiled with the QB64 compiler.
Note the recent update from release v1.52 to v1.53 which now holds improved test for length of FFtab files. With v.1.55 it also shows the name of the engaged with FFTab file in its window frame header. Which is welcome for documentation in form of screenshots.

   Read about the AGTC_lite DOS Console program


   Read about the AGTC DOS Console program

AGTC_lite.xls:     Antenna G/T Calculation Microsoft Excel

An MS Excel® Sheet that computes an Antennas max. Gain, Average Gain, Temperature and G/T

   Read about the Antenna G/T Calculation Microsoft Excel®

AGTC.xlsx:     Antenna G/T Calculation Microsoft Excel with matrix rotation

An MS Excel® Sheet that computes an Antennas max. Gain, Average Gain, Temperature and G/T

   Read about the Antenna G/T Calculation Microsoft Excel®

azel:     Antenna G/T Microsoft Excel® FFTab Loader (Basic Program)

   Read about the Microsoft Excel® FFTab Loader

73, Hartmut, DG7YBN

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