====== Additional Crystal Model 213 ====== {{xtal.jpg?|}} ===== Description ===== Optional plug-in crystal to extend 10 meter coverage of Models [[540]] and [[544]] from 29.5 to 30.0 MHz. Model 213 frequency is 15.490 MHz in an HC-25U case. (From the Ten-Tec Reflector October 16, 2004.)