IN3LBQ on the Hühnerspiel (Amthorspitze) - photo by IN3OTD

5 watt power amplifier measurements

Under construction...

Wideband linear PA by DL2EWN (FunkAmateur 07/2008 and 08/2008). DL2EWN 5 watt power amplifier
The amplifier has been characterized for different driver stage supply voltage (Vd), final stage supply voltage (Vf) and final stage standby current (If):

Vd=12V, Vf=12V If=700 mA

The fundamental and harmonics output levels versus input power, with a 10 MHz sinewave input, is shown in the graph below:

DL2EWN_5W_PA_12V_12V_700mA_harmonics.png

RF output and DC current drawn from the supply versus input power (10 MHz sinewave) are shown in the following graph:

DL2EWN_5W_PA_12V_12V_700mA_Pout_Idc.png

and the resulting efficiency is shown in the graphs below (data are the same for the two graphs, in the first the input and output power are in dBm and in the second they are in watt):

DL2EWN_5W_PA_12V_12V_700mA_Pout_efficiency.png DL2EWN_5W_PA_12V_12V_700mA_Pout_W_efficiency.png

The third-order intermodulation products amplitude w.r.t the output power per-tone is shown in the graph below (to obtain the actual [average] output power multiply the value by two, to have the PEP, multiply by 4):

IM3 levels vs. output power

IMD products vs. tone spacing at 3.5 W PEP output

IMD vs. tone spacing

Vd=12V, Vf=13.8V, If=700 mA

The fundamental and harmonics output levels versus input power, with a 10 MHz sinewave input, is shown in the graph below:

DL2EWN_5W_PA_12V_13.8V_700mA_harmonics.png

RF output and DC current drawn from the supply versus input power (10 MHz sinewave) are shown in the following graph:

DL2EWN_5W_PA_12V_13.8V_700mA_Pout_Idc.png

and the resulting efficiency is shown in the graphs below (data are the same for the two graphs, in the first the input and output power are in dBm and in the second they are in watt):

DL2EWN_5W_PA_12V_13.8V_700mA_Pout_efficiency.png DL2EWN_5W_PA_12V_13.8V_700mA_Pout_W_efficiency.png

The third-order intermodulation products amplitude w.r.t the output power per-tone is shown in the graph below (to obtain the actual [average] output power multiply the value by two, to have the PEP, multiply by 4):

IM3 levels vs. output power

Vd=12V, Vf=15V, If=700 mA

The fundamental and harmonics output levels versus input power, with a 10 MHz sinewave input, is shown in the graph below:

DL2EWN_5W_PA_12V_15V_700mA_harmonics.png

RF output and DC current drawn from the supply versus input power (10 MHz sinewave) are shown in the following graph:

DL2EWN_5W_PA_12V_15V_700mA_Pout_Idc.png

and the resulting efficiency is shown in the graphs below (data are the same for the two graphs, in the first the input and output power are in dBm and in the second they are in watt):

DL2EWN_5W_PA_12V_15V_700mA_Pout_efficiency.png DL2EWN_5W_PA_12V_15V_700mA_Pout_W_efficiency.png

The third-order intermodulation products amplitude w.r.t the output power per-tone is shown in the graph below (to obtain the actual [average] output power multiply the value by two, to have the PEP, multiply by 4):

IM3 levels vs. output power