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This is an Antenna Tuning System ATS 50-2 plus the attached Directional Coupler Unit
CU 2/50V. These were in the direct power output path of the GPT-750.
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Front view. I found a description in a TMC sales brochure that described a
device called a "Standing Wave Ratio Indicator, Model SWR-1K" that looks exactly like
this unit. I can't find anything on the unit that says SWR-1K. The meter, however, is definitely
calibrated in VSWR, as well as forward and reflected power. The description from the sales brochure goes
as follows: "The TMC Model SWR-1K Standing Wave Ratio Indicator provides an accurate indication
of the standing wave ratio over the frequency range of 2 to 32 megacycles up to 1KW input for either
50 or 70 ohm transmission lines. The unique design of the instrument permits simultaneous indication
of forward RF power, reflected RF power and direct readings of standing wave ratio."
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Here is the ID tag. |
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Directional Coupler. |
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Top view with lid off.
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Closeup of circuitry behind panel.
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Back view.
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Underneath the chassis.
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Closeup of under-chassis view.
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