Antenna Tuner Model 228

The Model 228 antenna tuner is an inductive/capacitive network used for matching unbalanced 50 - 75 ohm output impedances of transmitters and transceivers to a variety of loads, both balanced and unbalanced. It operates over a frequency range of 1.8 to 30 MHz. It has a built-in antenna select switch which permits bypassing the tuner or selection of three different antennas. Model 228 has a built-in SWR bridge and meter. Same as Model 227 but with the addition of the SWR bridge/meter.

• Circuit: T network
• RF Power: 200 watts, intermittent; 100 watts continuous
• Capacitor Voltage Rating: 1 KV
• Inductor: 47 taps, 18 gauge silver-plated wire on a 2" diameter core
• Input Impedance: 50 - 75 ohms, unbalanced
• Output: Matches most loads, balanced and unbalanced. Maximum balanced load 1.8 to 4.0 MHz is 500 ohms.
• Frequency Range: 1.8 to 30 MHz
• Finish: Painted front and rear panel; black textured sides and top