This is a picture into the rear of the
91 cabinet on Greylock.
The top alum box with the hole on the left is the relay control.
Below it there is the controller of sorts.
Then a 440mhz control receiver (gold box).
Below that is the repeater (heat sink is on the PA).
Here is the lower half of the rear of 91.
The heat sink is the back of the PA and
below that is the power supply.
On the floor is some of the duplexer.
