Cable Loss Between The Test Set And The Module - Keysight Technologies N52 Series User's And Service Manual

Installation & System Operation

Cable Loss Between the Test Set and the Module

If the cables between the test set and the millimeter-wave modules are longer
than four feet, cable loss for the RF and LO paths may be excessive. Perform
the analysis recommended below.
Determine the input power level requirements for the millimeter-wave module
selected for use. Refer to the documentation included with your module. To
determine the power available at the module, calculate the cable loss using
Figure 1-9
characteristic power of 10 dBm. You may also use a power meter.
A separate DC supply is recommended for OML modules if they are greater than 5 meters from
the controller. A DC bias power cable, with banana plug connectors, is available for use with a
separate power supply such as E3615A for OML modules. VDI modules have a DC power supply
included with the module.
If you are installing an external amplifier in the LO or RF path, ensure the amplifier's input is
connected to the test set, and the output is connected to the mm-wave module's LO or RF Input.
Modules with internal amplifiers are available.
Typical Cable Insertion Loss (N5261/62A Options)
Table 1-11
Cable Option
501
502
503
505
Typical RF Cable Loss (dB loss per foot)
Figure 1-9
22
or Table 1-11, then subtract the cable loss from the RF and LO Out
Cable Length 7 GHz
4 ft. (1.22 m) 1 dB
6.58 ft. (2 m) 1.65 dB
9.83 ft. (3 m) 2.5 dB
16.4 ft. (5 m) 4.1 dB
10 GHz 18 GHz
1.2 dB 1.6 dB
2 dB 2.65 dB
3 dB 4 dB
5 dB 6.6 dB
Keysight N5261/62A User's & Service Guide