MFJ MFJ-4117 User Manual

MFJ-4117 Bias-Tee with DC Switch

1-60 MHz

INTRODUCTION

The MFJ-4117 Bias-Tee is ideal for running coax to distant devices allowing them to be placed anywhere regardless of power availability. Several MFJ products have a built in Bias-Tee, so the DC / RF coaxial cable can be directly connected to them as well.

The MFJ-4117 Bias Tee operates on to inject DC voltage onto coaxial lines. another MFJ-4117 on the terminating Amp maximum adapter will work. The remote equipment on and off.

frequencies ranging from 1-60 MHz. The Bias-Tee is used The DC voltage is separated from the RF signal by

end (See Figure 1). Any standard 2.1 mm 1-50 VDC, 1 MFJ-4117 is equipped with a DC switch to turn the

INSTALLATION INSTRUCTIONS

1.Connect the transmitter to the “RF IN/OUT” coaxial connector on Bias-Tee 1 using a 50-ohm coaxial cable. (See Figure 1) This is the RF signal input connector.

2.Connect a DC adapter to the “DC IN\OUT” jack. This is your DC voltage input connector.

3.If the device you are using does have a built in Bias-Tee, connect the device to the “RF/DC OUT/IN” coaxial connector on Bias-Tee 1 using 50-ohm coaxial cable. The device will recover the RF and DC signals.

4.If the device you are using does not have a built in Bias-Tee, connect the “RF/DC OUT/IN” coaxial connector from Bias-Tee 1 to the “RF/DC OUT/IN” coaxial connector on Bias-Tee 2 using a 50-ohm coaxial cable. This is your RF/DC out of BiasTee 1 into Bias-Tee 2 to be recovered.

5.Connect the device to the “RF IN/OUT” coaxial connector of Bias-Tee 2 using a 50ohm coaxial cable. This is your recovered RF signal output connector.

6.Connect the device to the “DC IN\OUT” of Bias-Tee 2 using a DC adapter. This is your recovered DC voltage output connector.

DC				DC / RF				DC
Switch			Bias-Tee			Bias-Tee		out
in								RF
			1			2
RF
								out
in
			Figure 1: MFJ-4117 Bias-Tee Operation Diagram