srf1750af1k000 Quintech Electronics, srf1750af1k000 Datasheet - Page 2

• Manufacturer Part Number: srf1750af1k000
• Description: Rf A/b Terminating Switch
• Manufacturer: Quintech Electronics

Special Instructions:
The SRF1750AF1K000 is a terminating A/B switch that operates in the frequency range 50-1750 MHz. Signal flow is
controlled by a single contact closure. All RF connections are made via 75 ohm F-Type connectors. Power and control
functions are applied using feed-thru studs. Refer to the figure below for instructions regarding the connection and use of
the SRF1750AF1K000 switch.
Note: The SRF1750AF1K000 is a bi-directional switch, therefore the connectors labeled “INPUT” may be used as outputs. Likewise, the
connector labeled “OUTPUT” may be used as an input.
Begin by connecting the RF inputs and output to the proper F-Type connectors on the SRF1750AF1K000. The default
signal path is between RF INPUT A and OUTPUT.
Next, determine where power for the switch is coming from and to where it will be routed. Power should always be
present at the DC terminal, either via the center conductor of the coaxial cable on the OUTPUT F-Type connector or by
powering externally via the DC terminal. A required voltage of +18 to +24 VDC at 40 mA is required for the switch. If DC
power must be present at RF INPUT A, for LNB power, a jumper wire should be connected between DC POWER and
LNB PWR A. If DC power must be present at RF INPUT B, for LNB power, a jumper wire should be connected between
DC POWER and LNB PWR B. Power may be passed from OUTPUT to both INPUTS by connecting all three DC
terminals.
In order to change routing of the RF signal from its default, the terminal labeled “CTRL” must be grounded. The device
used to ground this terminal must be capable of sinking approximately 40 mA of current. Grounding this terminal will
route the RF signal between RF INPUT B and OUTPUT. Releasing the CTRL terminal will return the switch to its original
position.
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© 2009 Quintech Electronics and Communications Inc. All rights reserved. All product designs and specifications are subject to change without notice.
.SRF1750AF1K000 Rev I, CO# 13717 (page 2 of 2)