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3.3 Simple Signal Source
The signal source function is capable of generating equal amplitude,
modulated amplitude, modulated frequency, as well as modulated phase
signals. Port 2 (on the right side) supports 100MHz-6Ghz while port 1 (on the
left side) supports 9kHz-10.8/18.6GHz. Without ALC, the maximum output
amplitude varies as the frequency changes. The displayed value of maximum
output amplitude has been calibrated in advance, which ensures a decent
precision. If the amplitude decreases, the precision of the first 30dB below the
maximum output is still acceptable. Yet further amplitude decrease
compromises precision further, the maximum error can be over 6dB.
For the left port, 9kHz-1GHz signal is produced by mixing. With a strict
low-pass filter, it's relatively pure. 6-10.8/18.6GHz signal is produced by
mixing as well. However, with simple filter, the signal contains severe impure
waveforms like local oscillation. Thus attention should be paid when using.
Both ports are capable of outputting relatively small signal, especially the
right port. When attached to an power attenuator whose attenuation is more
than 30dB, it is possible to serve as a sensitivity tester for radio transmitter. On
the other hand, the left port is usually used for larger output amplitude
scenario. Normally it can reach 10dBm below 6GHz while 0dBm above 6GHz.
Due to the fact that the minimum amplitude on the left port is higher, the
minimum attenuation for the attenuator to be externally attached for a
sensitivity would be 50dB. As mentioned above, the precision is poor while
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