USED Collins 312B-4 Speaker / Wattmeter.

The Collins 312B-4 integrates the 75S-3B, 32S-3, 30S-1 and accessories into an operating system. The KWM-2 and 30S-1 can also be integrated into an operating system by the 312B-4. A speaker, RF directional wattmeter (with 200/2000 watt scales) and a hybrid-type phone patch are included in the console

The 312B-4 Station Controls

• Contains a directional couple and wattmeter, a speaker, a phone patch, and appropriate switching circuitry.
• The wattmeter indicates power levels within the ranges of 0 to 2000 watts, forward or reflected. It is accurate over the range of 2 to 30 MHz but should not be used on higher frequencies.
• The phone patch includes circuitry which allows VOX phone patch operation. It can also be switched manually if desired.

Directional Couple and Wattmeter Specifications:

• Frequency Range: 2-30MHz
• Imepdance: 52 Ohms unbalanced
• Wattmeter Scales: 200 watts forward, 2000 watts forward, 200 watts reflected, 2000 watts refelected
• Dimensions: 10 x 7.75 x 12.25 inches
• Weight: 8.5 Lbs
• Max Power: 2000 watts forward power
• Power Loss: less than 0.1 percent
• Introduced SWR: less than 1.05:1, 2 to 30 MHz

Phone Patch Specifications:

• Input Imepdance: 600 Ohms
• Output Impedance: 600 Ohms

PM Speaker Specifications:

• Impedance 3-44 Ohms
• Size: 5-7 inches