The Ten-Tec 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. It has a built-in SWR bridge and 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