Note
The MFJ-971 is a compact 200-Watt portable tuner compatibly packaged with. MFJ QRP transceivers. It provides a convenient cross-needle type SWR/Wattmeter and features a special user-selectable 6-Watt range for QRP operation.
The T-match tuner covers 1.8-30 MHz and tunes almost any coax, wire, or balanced-feed type antenna (a 4:1 toroid balun is built in for balanced line).
The 971 uses a crossneedle style meter to display FORWARD power, REFLECTED power, and SWR simultaneously. To read Forward Power, observe the FORWARD meter scale. To read Reflected Power, observe the REFLECTED meter scale. To read SWR, observe where the two needles cross. The corresponding red curve on the meter face displays your SWR reading. No "zero" or "sensitivity" adjustment is required with cross-needle SWR displays.
The FORWARD scale is calibrated from 0-300 Watts and the REFLECTED scale from 0-60 Watts. In the high-power range, read both scales directly (x 1). In the 30 Watt range, move the decimal point one place to the left (x 0.1).
For QRP sensitivity (6-Watts FORWARD, 1.2-Watts REVERSE), you must perform a simple conversion to obtain actual power. You can convert in your head by moving the decimal point two places to the left and doubling the reading (ie. 300 W = 3.00 x 2 = 6 W). You may also multiply the scale reading times 0.02 on a pocket calculator.
