Helfrick, Albert D. <br/><br/>
Amateur radio equipment fundamentals / 
by Albert D. Helfrick. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1982. 
 - xii, 284 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0130236551 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radio--Apparatus and supplies--Design and construction--Amateurs' manuals.<br/>Amateur radio stations.