Signal Sierra Victor

A radio transmission located southeast of Jocko's Pop & Gas Stop, and east of the VAPL-66 Power Station. The large antenna tower near the station entrance can be turned on with a lever on the transformer at its base. Once the power is restored, it begins broadcasting Morse code. The station generating the transmission is in a Drainage Chamber reached via a manhole. The manhole is southeast of the broadcast tower. It can be reached by using the downed radio tower as a bridge across the canyon that separates the manhole from the broadcast tower. The manhole is south of the far end of the downed tower. Before his death, the assumed broadcaster set a number of traps and barricaded himself in the lone room in the manhole.

Morse code translation:

CQ CQ CQ DE SV SV SV K

This translates to "calling anyone, this is Sierra Victor, over". For more on the nine stations broadcasting Morse code, see this.

Traps
This is quite a dangerous location due to several very nicely placed traps, providing an entertaining challenge for explosives experts.
 * In the entrance corridor there are two pressure plates placed on the crossing with collapsed tunnel. They trigger two rigged shotguns.
 * Up further the path is blocked by a barricade made with some arms cabinets and a barrel. The barrel is the only movable object here. Right behind the barrel there is a grenade bouquet trap. You can try to move the barrel (using 'Z' on the PC or clicking right stick down on the 360 and the right analog stick on the PS3) to lay it down and then reach the trap to disarm it. Grabbing the top and walking it back towards you can lay it down, then go to third person view to extend your reach. Alternatively, gingerly jump onto the cabinet (without bumping into the barrel), and you can directly reach the bouquet. The barrel cannot be dragged back towards you, and pushing it forward will trigger the trap. The trap is very effective in this tiny space, and even if you retreat halfway up the corridor, you can still be injured by fragments. The easiest way to get past this trap is to throw a grenade down the corridor or shoot the barrel to drop it down.
 * Left corridor is rigged with two frag mines just in front of the door.
 * Right corridor is clear.
 * Inside the main room there is only one trap - a rigged terminal. The trap is activated by using the terminal, NOT by getting close to it. To defuse it you have to walk around and reach the back panel

Notable loot

 * Mini nuke
 * Duck and Cover!
 * It has all the components except for the pressure cooker for the railway rifle.