MFJ MFJ-4712 Instruction Manual Download Page 3

MFJ-4712 2-Position Remote Antenna Switch   

Instruction Manual

 

OPERATION 

 

1.  Slide the Selector Switch to choose the desired antenna.  The switch 

positions are numbered on the 4712RC. When the DC is ON, Antenna 2 is 
selected.  When the DC is OFF, Antenna 1 is selected. Unused inputs are 
grounded. 

 

2. 

Once the antenna is selected, you may transmit into the selected antenna.

 

 
 
 

IMPORTANT:

 

NEVER switch antennas with RF power applied to the  

 

 

 

Master feedline.  Damage to the switching contacts may 

 

 

 

result from “hot-switching”.  

 
 
TECHNICAL ASSISTANCE 

 

If you have any problem with this unit first check the appropriate section of this 
manual.  If the manual does not reference your problem or reading the manual 
does not solve your problem, you may call 

MFJ Technical Service

 at 

662-323-

0549

 or the 

MFJ Factory

 at 

662-323-5869

.  You will be best helped if you have 

your unit, manual and all information on your station handy so you can answer 
any questions the technicians may ask. 
 
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park 
Road, Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to 
[email protected].  Send a complete description of your problem, an 
explanation of exactly how you are using your unit, and a complete description of 
your station. 
 
 

NOTES 

 

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