MFJ MFJ-415B Скачать руководство пользователя страница 4

MFJ-415B CW Adapter 

 

Instruction Manual 

PC Board Installation  

(see following diagram)

 

!

  Remove the six (6) lid screws and take off the transceiver's cover.  

!

  Remove the cap from CW adapter's 

IN/OUT 

push-button

 

switch. 

!

  Position the adapter and insert onto transceiver header pins (2 in front, 4 in back). 

!

  Secure the module in place with three (3)  #6-32 x 1/4" screws. 

!

  Reinstall the adapter's 

IN/OUT 

switch cap. 

 

Sidetone

QSK Delay

CW Offset

Key

CW In/Out

Band Select

40-Meter CW

20-Meter CW

Rear Header

Front Header

VFO Calibrate

VFO Calibrate

Off/On

MFJ-9440 or MFJ-9420

MFJ-415B

Access Hole for

Adjusting L3

40
20

 

 
 

Shorting Plugs 

!

  For internal sidetone, install a shorting plug on J104.  For 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 CW adapter has been pre-adjusted at the factory, but final alignment is 
needed to mate the adapter with your particular radio.   
 

!

!

!

!

  Transceiver Recalibration of VFO (L3): 

Installing the module adds a small amount of stray capacitance to the VFO tank--
changing the calibration of the transceiver's VFO slightly.  Before the CW adapter can be 
aligned, you must recalibrate L3 in the transceiver VFO to eliminate this error.  To do 
this, you'll need an accurate mid-band signal source such as a signal generator, 
synthesized transceiver running low power into a dummy load, or a MFJ-259 analyzer.  
Make sure the module is installed and the CW-adapter switch is 

OFF 

when making this 

adjustment. 

Содержание MFJ-415B

Страница 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...

Страница 2: ......

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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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