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Description
The oldest of the Royal Navy's frigates, having been converted from World War II Wartime Emergency Design Utility destroyers, the Type 15 was retained in service post-October War. Unlike its sisters, the Type 16, the class was determined to be worth upgrading for further service.
The upgrade was mainly restricted to weaponry, removing the obsolete twin 4-inch gun aft of the funnel and replacing it with a 3-inch Mark 6 twin turret on the bow. To accommodate the 3-inch magazine, storage and accommodation previously located in the fo'c'sle was moved to the old 4-inch mag. A quadruple 21-inch torpedo launcher was fitted over the plated-off gun turret housing, capable of launching the Mark VIII unguided 21-inch torpedo or a Mark 20 18-inch homing torpedo with a 1.5-inch thick sabot. Anti-aircraft weaponry consisted of a single triple Sea Cat launcher, two 20mm Oerlikon cannon and the 3-inch guns.
Their main role was, as always, anti-submarine warfare, however. For this the type featured a comprehensively upgraded sonar suite, two three-barrel Squid depth charge mortars and the torpedo tubes. The post-WWIII upgrade added a landing pad on the stern that was capable of accommodating a Wasp helicopter, but there was insufficient space for a hangar. The upgrade gave the Type 15 an extra 10-15 years of service life and these ships were still run until their machinery wore out.

Specifications:
Type: Frigate
Displacement: 2,300 long tons standard; 2,700 long tons full load
Length: 358 ft (109 m) o/a
Beam: 37 ft 9 in (11.51 m)
Draught: 14 ft 6 in (4.42 m)
Propulsion: 2 × Admiralty 3-drum boilers; steam turbines on 2 shafts
Installed power: 40,000 shp (30 MW)
Speed: 31 knots (57 km/h; 36 mph) (full load)
Complement: 174

Radar:
Type 293Q target indication
Type 277Q surface search
Type 974 navigation
Type 262 fire control on director CRBF (Sea Cat) and STAAG (3-inch guns)
Type 1010 Cossor Mark 10 IFF

Sonar:
Type 174 search
Type 162 target classification
Type 170 attack

Armament:
1 × twin Vickers 3-inch Mark 6 gun
2 × 20mm Oerlikon (single mounts)
2 × Squid anti-submarine mortars
1 × triple GWS.21 Sea Cat SAM launcher
1 × quad 21-inch turpedo launcher

Aviation facilities:
Flight deck for 1 × Westland Wasp helicopter (no hangar)

* * *

You can see the rest of the stuff in this AU here: Timeline 27-10-1962

Description
The oldest of the Royal Navy's frigates, having been converted from World War II Wartime Emergency Design Utility destroyers, the Type 15 was retained in service post-October War. Unlike its sisters, the Type 16, the class was determined to be worth upgrading for further service.
The upgrade was mainly restricted to weaponry, removing the obsolete twin 4-inch gun aft of the funnel and replacing it with a 3-inch Mark 6 twin turret on the bow. To accommodate the 3-inch magazine, storage and accommodation previously located in the fo'c'sle was moved to the old 4-inch mag. A quadruple 21-inch torpedo launcher was fitted over the plated-off gun turret housing, capable of launching the Mark VIII unguided 21-inch torpedo or a Mark 20 18-inch homing torpedo with a 1.5-inch thick sabot. Anti-aircraft weaponry consisted of a single triple Sea Cat launcher, two 20mm Oerlikon cannon and the 3-inch guns.
Their main role was, as always, anti-submarine warfare, however. For this the type featured a comprehensively upgraded sonar suite, two three-barrel Squid depth charge mortars and the torpedo tubes. The post-WWIII upgrade added a landing pad on the stern that was capable of accommodating a Wasp helicopter, but there was insufficient space for a hangar. The upgrade gave the Type 15 an extra 10-15 years of service life and these ships were still run until their machinery wore out.

Specifications:
Type: Frigate
Displacement: 2,300 long tons standard; 2,700 long tons full load
Length: 358 ft (109 m) o/a
Beam: 37 ft 9 in (11.51 m)
Draught: 14 ft 6 in (4.42 m)
Propulsion: 2 × Admiralty 3-drum boilers; steam turbines on 2 shafts
Installed power: 40,000 shp (30 MW)
Speed: 31 knots (57 km/h; 36 mph) (full load)
Complement: 174

Radar:
Type 293Q target indication
Type 277Q surface search
Type 974 navigation
Type 262 fire control on director CRBF (Sea Cat) and STAAG (3-inch guns)
Type 1010 Cossor Mark 10 IFF

Sonar:
Type 174 search
Type 162 target classification
Type 170 attack

Armament:
1 × twin Vickers 3-inch Mark 6 gun
2 × 20mm Oerlikon (single mounts)
2 × Squid anti-submarine mortars
1 × triple GWS.21 Sea Cat SAM launcher
1 × quad 21-inch turpedo launcher

Aviation facilities:
Flight deck for 1 × Westland Wasp helicopter (no hangar)

* * *

You can see the rest of the stuff in this AU here: Timeline 27-10-1962