TB 11-6625 -3263-25
Upper frequency limit of the AN/URM -84A is 63 GHz. Upper frequency
limit of the AN/USM -489 is 40 GHz with mixers supplied (to 220 GHz with
additional Tektronix mixers). If a unit is authorized an AN/UPM-84A and
does not require a frequency range above 40 GHz then the AN/USM -489
can replace the AN/UPM-84A.
Subject item is a plug in unit used with Tektronix 7000 series mainframes.
If the 7000 series mainframe is used only with the PL-1392/U, then the
mainframe shall be removed from the field with the PL-1392/U. If the
mainframe is used with other plug -ins, then the unit shall retain the
mainframe but still remove the PL-1392/U from the field.
The AN/USM-489(V)1 or AN/USM-489A can replace the IP -1216(P)/GR
when used with the plug -in configurations listed below and when the SG-
1125/U is not required to be used in conjunction with the PL-1406/U.
Configurations replaceable by AN/USM -489(V)1 or AN/USM -489A:
Plug-in IF section removed from the field only when unit does not have the
PL-1387/U or the PL-1399/ U.
Item is a plug -in module that is functional only when used with a