Radio

This section has a set of radio and radio performance calculations.

 

Rcvr Noise

Enter the inputs Temperature in Kelvin, Bandwidth in Hz, ENR (Excess Noise Ratio) of Source in dB, Pre-Amp Gain in dB the Radio Noise Figure in dBF and the Radio Gain in dB and press “Calculate” to get the Radio Output Power in dBm per Hz.   Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.  The temperature defaults to 290K (room temp 27C) some of the other parameters such as bandwidth also default to help prevent errors in the calculation caused by blanks or zeros.

 

Figure 83 – Radio Rcvr Noise Power


SFDR

Enter the inputs Temperature in Kelvin, Bandwidth in Hz, the Radio Noise Figure in dBF and the Radio 2nd and/or the 3rd order IMD or Inter-Modulation in Output Power dBm and press “Calculate” to get the Radio Spurious Free Dynamic Range for 2nd and/or 3rd order products.  Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.  The temperature defaults to 290K (room temp 27C) some of the other parameters such as bandwidth also default to help prevent errors in the calculation caused by blanks or zeros.

 

Figure 84 – Radio Spurious Free Dynamic Range

 


MDS

Enter the inputs Temperature in Kelvin, Bandwidth in Hz, the Radio Noise Figure in dBF and the Radio Input Signal and Input Noise Level in dBm and press “Calculate” to get the Minimum Detectable Signal or MDS in dBm.  Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.  The temperature defaults to 290K (room temp 27C) some of the other parameters such as bandwidth also default to help prevent errors in the calculation caused by blanks or zeros.

 

Figure 85 – Radio Minimum Detectable Signal

 


Carrier to Noise or C/N

 

C/N <> Eb/No w/DataRate

Enter the inputs Eb/No (energy of data by Noise power) in dB, Bandwidth in Hz, the Radio Data Rate in MB/Sec and press “Calculate” to get the Carrier to Noise ratio in dB.  Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.  The temperature defaults to 290K (room temp 27C) some of the other parameters such as bandwidth also default to help prevent errors in the calculation caused by blanks or zeros.

 

C/N<> RSL_NF_T_B

Enter the inputs Temperature in Kelvin, Bandwidth in Hz, the Radio Noise Figure in dBF and the Radio Input Signal in dBm and press “Calculate” to get the Carrier to Noise ratio in dB.  This function can be worked the other direction as well enter C/N and get RSL. Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu.  The temperature defaults to 290K (room temp 27C) some of the other parameters such as bandwidth also default to help prevent errors in the calculation caused by blanks or zeros.

 

Figure 86 – Radio Carrier/Noise Calculations

 


Cascade

Enter the inputs Input Power in dBm, and the Gain in dB, Noise Figure in dBF and Third Order Intermodulation in dBm of the stages in the Radio and press “Calculate” to get the Total Gain in dB, Total Noise Figure in dBF and Total Intermod dBm.  This function can be worked the other direction as well enter C/N and get RSL. Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu. 

 

Figure 87 – Radio Cascade Calculation


Antenna

Enter the Mid-Band Frequency of operation in MHz, the Loading Factor (capacitive end loading), the Length to Diameter ratio approximation and press “Calculate” to get the Antenna Factor and the Antenna Lengths for Quarter and Half Wavelengths in ft, cm and Meters.  Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu. 

 

Figure 88 - Radio Antenna Calculations

 


ERP

Enter the inputs of Transmitter Power in dBm, Transmitter (source) match in dB, System Return Loss (Noise Level) in dB, Antenna (Load) Match in dB and the Transmitter to Antenna Cable Loss in dB and press “Calculate” to get the Corrected Transmit Power dBm.  Add the variable for Antenna Gain and it computes the EIRP Effective Isotropic Radiated Power. Finally enter the Distance to receiver or measurement point and calculate the Power Density. Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu. 

Figure 89 – Radio Effective Radiated Power Calculations

Path Loss

Enter the frequency in MHz and the Distance to get the Path Loss for Isotropic Atmospheric Loss in dB. In addition, the user can input the Power Transmitted (Xmit) and the Power Received both in dBm. Press “Calculate” to get the Path Loss in dB for either or both calculations.  Press “Clear” to clear the coefficients and begin over. Press the “Close” button to quit the screen and go back to main menu. 

 

Figure 90 – Radio Radiative Path Loss