The 10 watts peak envelope power linear transmitter for single sideband operation will be examined.
Test conditions are: 10 watt pep on every band, rf line terminated with 50 ohm dummy load, input audio two-tone signal identically applied for each measurement.
Measurements have been taken with RIGOL DSA815 spectrum analyzer, RIGOL DS1054 digital oscilloscope and Goldstar DS7040 analog oscilloscope.
Measurements (Graphical presentation)
For the 5 radio frequency bands the spectral analysis show the following results:
IMD3 on the 80, 40, 20 and 17 meter bands are quite acceptable, for 15 meters there is still some room for improvement. ;-))
Even it is not spectrum analysis a voltage graph should also be discussed. The signal is shown for 14.200 MHz modulated with a dual-tone signal. Horizontal division is 10 volts per grid line:
vy 73 de Peter