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--- 228 [2007/12/04 02:41]
n5na created
+++ 228 [2008/05/13 23:36] (current)
n5na
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 ====== Antenna Tuner Model 228 ======
 {{228.jpg?150|}}{{228rear.jpg?150|}}
+===== 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.  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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