Codan Radio MT-4E Analog and P25 Digital - Maintenance Guide - Manual (Page 41)

MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 5: Codan Radio System Testing Page 33
On the IFR 2975, recall Codan setup 4 (Rx_PreTune) from your internal drive. Enter the correct RF
frequency and ensure the receiver is turned on. In the “Trace” box on the right hand side of the screen
click on the “Run” button. The fi lter waveform should appear as shown in Figure 5-17. Click on Options
then Confi gure Markers to add optional markers to the spectrum analyzer if desired.
Figure 5-17: Receiver RF Preselector on the Spectrum Analyzer
To tune the RF Preselector fi lter, remove the dust caps on the variable capacitors and, starting from
the capacitor closest to the front panel of the receiver and moving back, tune the fi lter to its new
frequency.