"Advanced Settings" panel
==========================

The advanced settings panel allows the user to define some **custom parameters** to refine the survey design. 
Settings are divided into two sections, one for transceivers features and one for the TX combinations.

.. _advanced:
.. figure:: advanced.png
	:scale: 100%
	:alt: Advanced settings panel.
	:align: center
	
	Advanced settings panel.

In order to make the modifications persistent, click on the arrow-button 
**Apply** at the bottom of the panel, which implements the changes e leads back to the main design window.

.. _advanced_TRX:

Transceivers
-------------
The transceivers section contains two configuration parameters.

Box sensor spacing
^^^^^^^^^^^^^^^^^^^
	The value in the text box represents the distance between **successive electrodes 
	of two adjacent transceiving boxes**, as shown in figure :numref:`trx_spacing`.

	.. _trx_spacing:
	.. figure:: trx_spacing.png
		:scale: 100%
		:alt: Spacing between the transceivers.
		:align: center

		Spacing between the transceivers.


	When the **auto** checkbox is selected, the software automatically finds
	the spacing between the transceivers, based on the geometry of the electrodes:
	the distance will be equal to the width	of the largest transceiver dipole.

In/Out area tolerance
^^^^^^^^^^^^^^^^^^^^^
	Defines the **tolerance radius** in meters for arranging the *multisource* boxes
	within the survey area and is useful to make the generation of transceivers more flexible 
	in case of complex geometries of the survey area.
	In the example of figure :numref:`tolerance` the modification of the tolerance from 5 meters (**a**)
	to 20 meters (**b**) causes the insertion of five extra transceivers to the project, with an extended
	coverage of the boundaries of the survey area.

	.. _tolerance:
	.. figure:: tolerance_5_20.png
		:scale: 100%
		:alt: Example of generation of transceivers for different inside/outside tolerances: a) 5 m; b) 20m.
		:align: center
		
		Example of generation of transceivers for different inside/outside tolerances: a) 5 m; b) 20m.

	When the **auto** checkbox is selected, the software automatically calculates 
	a tolerance equal to 10% of the width of the largest transceiver dipole.


.. _advanced_TX:

Transmissions
--------------
Settings in this section allows to modify the properties of transmissions.

User-defined TX box combinations
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	In this textbox it's possible to define the box combinations to be used as transmitters.
	This option allows the user to choose **which boxes to use or combine in the transmissions**.
	To do this, simply add a line in the textbox for each desidered TX combination.
	For example, specifying the line *1 2 4* means generating a set of n-poles measurements where boxes 1, 2 and 4
	transmit simultaneously and the remaining boxes act as receivers.
	
	Since the automatic generation of transmitter combinations is governed by a box-proximity
	logic, this option allows for combining distant boxes in the transmission.
	It can also be useful to select a *subset* of boxes to be used as transmitters:
	those not specified in the list will always behave only by receivers.

	.. note::
		In the list of combinations **it is not possible to define mixed combinations of transmitters**,
		i.e. rows with a different number of transmission dipoles. The generation of n-poles measurements
		in ERTdesign_ms always consists of a fixed number of transmitters.
	
Add reciprocals AB<->MN (1TX only)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	This option allows for **adding reciprocal quadrupoles** in the sequence generation for
	single transmitter measurements. If the option is not checked, only the quadrupoles where
	the transmitter has a box number lower than the receiver box number will be generated.