HP 70427A User Manual page 400

Limits
Characteristics
Operating
considerations
Figure 11-7
SIGNAL input
This connector accepts the input signal for the downconverter.
•
Maximum level: +30 dBm
•
Frequency: 5 MHz to 26.5 GHz
•
Input impedance: 50 Ω
•
Typical return loss: 10 dB
•
Mixer compression point: – 10 dBm
Input level
Optimum mixer input level depends on the application. Level is set by
adjusting the input signal level and setting the internal input attenuators. For
making noise measurements you want the highest level above the noise
floor. For applications such as AM measurement where distortion is
important the signal should be as far below the mixer compression point as
possible.
HP 70427A
Connectors and Indicators (Front- and Rear-Panel)
HP 70427A/HP 70428A User's Guide 11-15
SIGNAL input