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MFJ-818 Mobile SWR/Wattmeter 

 

Instruction Manual 

 

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. 
 

Schematic 
 

 

Summary of Contents for MFJ-818

Page 1: ...o A slide switch turns the back light on or off This compact SWR Wattmeter is rugged enough to take the abuse of brutal mobile and portable operation Figure 1 MFJ Mobile SWR Wattmeter Installation 1 Connect your transmitter to the connector labeled TRANSMITTER and your antenna to the connector labeled ANTENNA It is important that you use good quality coax and properly installed connectors 2 An int...

Page 2: ...s 5 Watts below 10 Watts 10 Watts between 10 and 100 Watts and 25 Watts between 100 and 300 Watts In the 30W out position the forward power scale must be divided by 10 Each picket represents 0 5 Watts below 1 watt 1 watt from 1 to 10 Watts and 2 5 Watts from 10 to 30 Watts 3 Reflected power is displayed on the right hand REFLECTED meter scale Reflected power is 60 Watts full scale when the 300W in...

Page 3: ...onnect the Test Setup equipment as shown in Figure 2 Use a 50 ohm dummy load for the antenna Set the Transmitter to the 14 MHz in the 20 meter band 3 With the POWER RANGE button pushed in for the 300 Watt scale transmit 100 Watts as indicated on the reference meter Adjust the HI FWD trim pot to set the forward power scale to 100 Watts 4 With the POWER RANGE button pushed out for the 30 Watt scale ...

Page 4: ...ansmit 2 Watts as indicated on the reference meter Adjust the LO REF trim pot to set the reflected power scale to 20 Watts 8 SWR requires no calibration Figure 2 Test Setup Figure 3 Trim Pot Location Side View of MFJ 818 Transmitter Transceiver Standard Reference Wattmeter MFJ 818 Mobile SWR Wattmeter 50 Ohm Dummy Load HI FWD LO REF HI REF LO FWD ...

Page 5: ...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 techinfo mfjenterprises com Send a complete description of your p...

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