SteppIR SARK-110, User Manual

Page: 53 / 78

SteppIR
SARK-110
User’s Manual
Rev 1.1.7 October 29 th , 2014 - 53 - © Melchor Varela – EA4FRB 2011-2014
13 Transmission Line Add/Subtract
The SteppIR SARK-110 provides the capability of subtracting a length of transmission line
(transpose to load) or adding a length of transmission line (transpose to input). Use the subtraction
feature to discount the effect of the feed line so the measurements will be as if the analyzer were
connected at the antenna feed point. Use the addition feature for simulating the effect of a feed line.
The transmission line type has to be known in advance. The SteppIR SARK-110 provides a
comprehensive list of cable types and in addition the user can specify up to three custom cable
types. The selection of the cable is available in the menu
«Setup» «Cable Type» , see the
screenshot below:
The transmission line length has to be entered into the «TL Len» menu option within the Main
menu. Use negative quantities for Subtract operations (transpose to load) and positive quantities for
Add operations (transpose to input).
The pop-up edit dialog is activated by pressing the Select [ ■ ] button when the «TL Len» option is
active; see the screenshot below. The value is set by using Navigator B to adjust the digit at each of
the current length multiplier positions, shown in reverse video. The length multiplier position can be
changed using Navigator A. The length is validated by pressing the Select
[ ■ ] button. The setting is
cancelled by pressing any other button. Note that the length value can be set to zero by pressing the
Save Screen
[ ● ] button