IC718-Installation操作说明书手册

hupRF©2016hupRF Panoramic Adaptor Installation-IC718These instruction cover installation of the PAT board in the 1st IF of the ICOM IC718-64.455MHz-this gives access to all receiver options on the main receiver.Although the rig uses separate mixers in the Rx and Tx paths,the 1st IF filter(FL301B)iscommon to both directions.The connections shown here pick up the output of the filter afterthe diode switch,so significant Tx signal should not be present.However,it is recommendedthat PAT is powered from the R8V line,which will automatically mute it on transmit.Basic instructions are given for installing the PAT as an IF Panoramic Adaptor Tap-used in thismode your SDR must be tuned to the 1st IF of the radio,and then your display will track thetuning of your rig-however,the displayed frequency will be that of the IF,not the radio.Because the connection point on the IC718 is after the IF filter,the bandwidth available todisplay is restricted by the filter.In the block diagram to the left,the PATMAIN UNITinput signal will be picked up just beforeD401,the second mixer.88There are no convenient test pointsprovided by ICOM,so the signal andpower must be picked up directly from theMain circuit PCB.The PAT output can be brought out byeither a socket mounted in one of theventilation slots of the rear panel,or by aflying lead with a free plug on the end-this latter method is easier.Ist LoPAT Voe from herePAT input from here2nd LoThe circuit diagram to the left shows thepick up point for the PAT input and theconnection point for the Vcc power,taken from the R8V line.In practice,this measures about 6.9V on Rx and OVon Tx.PAT Install 71810Sept2016