Externally, this class differed little from the Restigouche class destroyer, Internally, they had a Communications Control Room (CCR) on-build. It replaced the Message Centre, Radio 1 and Radio 3 in the preceding classes. The CCR occupied the same space and included most of the equipment previously distributed in other compartments in the Restigouche and St. Laurent classes.
There is evidence to show that at some point CCRs were fitted to the St. Laurent class but the date is unknown. One unique fitting was the piano in the Wardroom during the 1973-74 period. Major Tony Hawkins, a ‘liaison officer’ on a West PAC training cruise made very good use of it while teaching young Officers bawdy WWII songs. Ships fitted with Wardroom pianos in the 1970s eventually had them removed in order to create more settee space in the Wardroom.

HMCS Mackenzie under way. Click on image to enlarge.  (VIa Aye Ready Aye)

The source of the radio antenna drawings  cannot be ascertained at this time. The information  contained within those drawings may not be  100% accurate. .

	261 antennas as built. This is the side view. Click on image to enlarge. (RCN student handout)
	261 class antennas as built.. Its confusing because the original drawing shows it as both front and aft view. Click on image to enlarge (RCN Student handout)

Communications and Control Room on No.2 deck in HMCS Mackenzie. Click on image to enlarge. (Provided by Darren Scannell)

Some oif the information about  the electronics was referenced  from Wikipedia.

ELECTRONICS

1 × SPS-12 air search radar
1 × SPS-10B surface search radar
1 × Sperry Mk.2 navigation radar
1 × SQS-10  hull mounted active search and attack sonar
1 × SQS-501 (Type 162) high frequency bottom profiling sonar
1 × SQS-502 (Type 170) high frequency Limbo mortar control sonar
1 × GUNAR (Mk.64 GFCS with 2 on-mount SPG-48 directors)
1 × UQC-1B "Gertrude" underwater telephone
 

PARTIAL RADIO LISTING (for HMCS Yukon)

1 × DAU HF/DF (High Frequency Direction Finder
1 x AN/WRT-1  300 to 1500 KHz transmitter; 500 watts..
5 x AN/URC-32 Transceiver. 2 to 30 MHz 500 watts
5 x AN/SRA-502 Broadband amplifier
5 x AN/SRA-506 Antenna coupler group.
3 x transmitting whip antennas.
Also refer to the No. 2 deck plan

Credits and References:

1) Cadillac of Destroyers by Ron Barrie and Ken Macpherson. Vanwell Publishing  1996
2) .https://en.wikipedia.org/wiki/HMCS_Mackenzie
3) Darren Scannell

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Feb 13/24