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The software for my analyzer (AIM4170C) creates a standard calibration file for anything as plugged directly into the SO-239 plug. To make this file the analyzer asks for a short circuit load, an open circuit load, and a pure resistive load of some amount. These loads came with the analyzer for this purpose.

I can also create a custom calibration file using these same loads (or their electrical equivalents if I am using a balun for example) and calibrate out the effects of pretty much anything. The analyzer uses this file to effectively cancel out whatever was between the analyser itself and the point the test loads were attached so anything else that is attached to that point is treated like it is plugged directly into the unit (or very close to it).

Because of this I can compare results as measured from both sides of the feed line with only minimal feedline effects coming into play. If the readings are noticeably different it is from one of two causes. One is an open or short in the feedline where one shouldn't be. These will drastically interfere with the readings effectively creating a test load condition no matter what is happening elsewhere. The other is other currents on the feedline that were not present when I made the custom calibration file.

This capability has functions beyond antenna tuning as well.

The DB

<blockquote data-quote="The DB" data-source="post: 427520" data-attributes="member: 21346">The software for my analyzer (AIM4170C) creates a standard calibration file for anything as plugged directly into the SO-239 plug.&nbsp; To make this file the analyzer asks for a short circuit load, an open circuit load, and a pure resistive load of some amount.&nbsp; These loads came with the analyzer for this purpose.I can also create a custom calibration file using these same loads (or their electrical equivalents if I am using a balun for example) and calibrate out the effects of pretty much anything.&nbsp; The analyzer uses this file to effectively cancel out whatever was between the analyser itself and the point the test loads were attached so anything else that is attached to that point is treated like it is plugged directly into the unit (or very close to it).Because of this I can compare results as measured from both sides of the feed line with only minimal feedline effects coming into play.&nbsp; If the readings are noticeably different it is from one of two causes.&nbsp; One is an open or short in the feedline where one shouldn&#039;t be.&nbsp; These will drastically interfere with the readings effectively creating a test load condition no matter what is happening elsewhere.&nbsp; The other is other currents on the feedline that were not present when I made the custom calibration file.This capability has functions beyond antenna tuning as well.<a href="http://hittman.us" target="_blank">The DB</a></blockquote>

[QUOTE="The DB, post: 427520, member: 21346"] The software for my analyzer (AIM4170C) creates a standard calibration file for anything as plugged directly into the SO-239 plug. To make this file the analyzer asks for a short circuit load, an open circuit load, and a pure resistive load of some amount. These loads came with the analyzer for this purpose. I can also create a custom calibration file using these same loads (or their electrical equivalents if I am using a balun for example) and calibrate out the effects of pretty much anything. The analyzer uses this file to effectively cancel out whatever was between the analyser itself and the point the test loads were attached so anything else that is attached to that point is treated like it is plugged directly into the unit (or very close to it). Because of this I can compare results as measured from both sides of the feed line with only minimal feedline effects coming into play. If the readings are noticeably different it is from one of two causes. One is an open or short in the feedline where one shouldn't be. These will drastically interfere with the readings effectively creating a test load condition no matter what is happening elsewhere. The other is other currents on the feedline that were not present when I made the custom calibration file. This capability has functions beyond antenna tuning as well. [URL="http://hittman.us"][COLOR="Black"]The DB[/COLOR][/URL] [/QUOTE]

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