== IF switch box ==

=== New scheme (after the EMIR upgrade in September 2013) ===

{{attachment:switch-box-sep2013.png|New switch box | width=550}}

=== Old scheme ===

{{attachment:switch-box-scheme2.png|New switch box for Nov 2011 | width=550}}<<BR>>
'''Figure 4.2:''' Overview of band combinations observable after the Nov 2011 upgrade (with a new switching box). See below for the Oct-2012 upgrade.

 * General band selection rules: 
   * Only four IF outputs (of 8GHz for E0, E2, E3, or of 4GHz for E1), from a single receiver or any of the band combinations E0/E1, E0/E2, E1/E3, can be used simultaneously.
   * Only a maximum of 4 inner bands can be selected.
   * IF-cables 1-4 can be connected to the inner or outer bands. IF-cables 5-8 can only be connected to the outer bands.
   * Selection of IF outputs is restricted by the following exclusion table (RxA+RxB refer to E0/E1, E0/E2 or E1/E3):
     * VL on RxA excludes the use of VU on RxB
     * VU on RxA excludes the use of VL on RxB
     * HU on RxA excludes the use of HL on RxB
     * HL on RxA excludes the use of HU on RxB
   * WILMA, 4MHz, and VESPA can only be connected to IF cables 1-4.
 * In October 2012, we upgraded the switch box to offer more options when using E150. See [[attachment:EMIR-Oct2012-E150-mod.pdf|here]].