MFJ MFJ-415B Instruction Manual Download Page 7

MFJ-415B CW Adapter 

 

Instruction Manual 

In Case of Difficulty 

!

  Radio does not shift to CW band or perform CW functions when adapter is activated.

  

Check headers to confirm sure all pins are inserted into the adapter board. 

 

!

  Stations do not respond to your calls or do not reply to you on your frequency.  Check 

Offset 

trimpot R103 for correct setup.  To approximate the factory default, set R103 

so the arrow  points to the "R" in R103.  Then, if needed, readjust.   

 

!

 Stations report hearing a continuous carrier between keyed characters.  Check 

transceiver's 

carrier null

 adjustment (R36).  Null for minimum carrier in SSB mode.  

Carrier should be at least -40 dBc, or 40-dB down from full CW output. 

 

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 your problem is not solved by reading 
the manual, you may call 

MFJ Technical Service

 at 

601-323-0549

 or the 

MFJ Factory

 at 

601-323-5869

.  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 601-323-6551; 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. 
 

Summary of Contents for MFJ-415B

Page 1: ...d Installation 2 Shorting Plugs 2 Adjustment and Calibration 2 Transceiver Recalibration of VFO 2 Module Calibration for CW Band 3 Module Adjustment for CW Offset 4 Module Adjustment for QSK Hold 4 In...

Page 2: ......

Page 3: ...to the transceiver s VFO circuit to shift frequency coverage into the CW portion of the band The specific components required to make the VFO shift are selected by the jumper plug on header J105 You...

Page 4: ...no sidetone remove it For MFJ 9440 place a shorting plug on center and rear pins of J105 For MFJ 9420 place a shorting plug on center and front pins of J105 Adjustment and Calibration Your MFJ 415B C...

Page 5: ...O dial are set to 14 000 MHz MFJ 9440 Signal source and VFO dial are set to 7 000 MHz If your MFJ radio lacks a CW band dial scale on its faceplate set the VFO dial to the low end of the phone band Th...

Page 6: ...personal preference by adjusting trimpot R102 To approximate the factory default position set the arrow on the trimpot to the 2 in the R102 silkscreen marking on the pc board Important VFO setting Not...

Page 7: ...e at least 40 dBc or 40 dB down from full CW output 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...

Page 8: ...MFJ 415B CW Adapter Instruction Manual 6 Schematic...

Page 9: ...5 Jack Stereo PCB 3 5 mm J104 612 0102 Header Pin Straight 375 1 2 Position J105 612 0103 Header Pin Straight 375 1 3 Position K101 408 1011 Relay Reed Type 12 V SPST L101 402 2710 Inductor Coilcraft...

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