MFJ MFJ-415B, Инструкция по эксплуатации, Страница: 4 / 9

MFJ-415B CW Adapter Instruction Manual
2
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.