The ARRL Handbook for radio amateurs 

 - 7a ed. 
 - Newington, Connecticut :   ARRL,   1993. 
 - 1214 p. 
<br/><br/><label>ISBN: </label>0872591700 
<br/><br/><label>Subjects--Topical Terms: </label><br/>RADIO
<br/><br/><label>Universal Decimal Class. No.: </label>621.396