I would start by looking in the subs upc file and go down to the UpgradePackSlot and see what radars are available when. It could be as simple as a timing issue. Check the areas that I have in bold and compare that to the dates in game that you are playing. This is what it looks like for the S-18 class for example.
[UserPlayerUnit 1.UpgradePackSlot 1]
ID= UpgSurfaceSearchRadar
NameDisplayable= Surface Search Radar
Type=NULL
AcceptedTypes=SSurfaceRadars
UserCustomizable=Yes
IDLinkUpgradePackSlots= EqSlot42, EqSlot43, SurfRadarAntenna
IDLinkUpgradePackSlotsIntervalDefault1= 1942-09-05, NULL, UpackSClassSJRadar
[UserPlayerUnit 1.UpgradePackSlot 2]
ID= UpgAirSearchRadar
NameDisplayable= Air Search Radar
Type=NULL
AcceptedTypes=AirRadars
UserCustomizable=Yes
IDLinkUpgradePackSlots= EqSlot33, AirRadarAntenna
IDLinkUpgradePackSlotsIntervalDefault1= 1942-04-31, NULL, UpackGatoSDRadar
;IDLinkUpgradePackSlotsIntervalDefault2= 1943-06-02, NULL, UpackGatoImpSDRadar
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USS Kentucky SSBN 737 (G)
Comms Div 2003-2006
Qualified 19 November 03
Yes I was really on a submarine.
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