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228 [2008/05/13 23:30]
n5na
228 [2008/05/13 23:36]
n5na
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 ===== Description ===== ===== Description =====
-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.+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.
  
 +===== Specifications =====
 +  ***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

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