X-Band IF Backpanel Connections

Below, please find a list and description of the backpanel connectors of the X-Band IF system. Please refer to the figure below for the location of connections.

RF Connections

Please refer to the table below for a description of the back panel connectors of the X-Band IF system. The function (I/O - input/output) of the connector is indicated in the second column.

Side Panel

Connector	I/O	Type	Description
SIG	I	SMA	Input signal for the receiver.
LO2	O	SMA	LO2 output of the microwave synthesizer (channel B)

Back Panel

Receiver (RCVR)

Connector	I/O	Type	Description
RCVR I	O	SMA	I channel of the quadrature receiver channel. This is typically referred to as the real signal of the detected EPR signal.
RCVR Q	O	SMA	Q channel of the quadrature receiver channel. This is typically referred to as the imaginary signal of the detected EPR signal.
RCVR IF	I	SMA	IF input of the RCVR. For X-Band operation, this should be connected to the LO1 output of the microwave synthesizer (channel A). Suggested Cable

Pulse Forming Unit (PFU) and AWG Input

Connector	I/O	Type	Description
PFU TX	O	SMA	Output of the PFU. This signal is typically routed to the high-power amplifier or the active multiplier chain (AMC) in high-field/high-frequency EPR spectrometers.
PFU BLNK	I	SMA	Blanking gate of the PFU. TTL logic. Active high. This signal has to be connected to the pulse programmer.
AWG I	I	SMA	I channel input of the PFU. This signal needs to be connected to the output channel of the AWG.
AWG Q	I	SMA	Q Channel input of the PFU. This signal needs to be connected to the output channel of the AWG.
AWG AUX	I	SMA	Auxillary input of the IQ mixer LO channel.

Synthesizer and Monitors

Connector	I/O	Type	Description
AUX IN	I	SMA	Auxillary microwave signal input. This signal is combined with the microwave signal generated by the IQ mixer of the PFU and allows the user to inject an additional, user-created microwave signal.
AUX OUT	O	SMA	LO signal of the LO input for the IQ mixer of the PFU. This signal is similar to LO1.
LO1	O	SMA	LO1 signal of the X-Band IF system (channel A of the synthesizer).
LO2	O	SMA	LO2 signal of the X-Band IF system (channel B of the synthesizer).
RCVR	O	SMA	Receiver input monitor.
PFU	O	SMA	PFU output monitor.

Reference Clock and External IO

Connector	I/O	Type	Description
10 MHZ	O	SMA	Oven-controlled 10 MHz reference clock signal. Output power level 10 dBm.
VCA	O	SMA	0 - 5 V DC signal. The output level of this signal can be controlled through the software. This signal is typically used for the Voltage Controlled Attenuator (VCA) of a high-frequency AMC.
EXT	O	D-Sub	9 pin d-sub connector. Pin Out
IO	O	D-Sub	9 pin d-sub connector. Pin Out

Other Connections

Side Panel

Connector	I/O	Type	Description
12 V	O	LEMO	12 V output. This supply voltage can be used to power up external equipment. Do not exceed 200 mA. Mating Connector

Other Connectors

Connector	I/O	Type	Description
EXT PWR	O	M12	Power supply e.g. for a frequency extension. Available voltages: -12 V, -5 V, 5 V, 12 V, 15 V
PWR	I	Amphenol	Power inlet for the X-Band IF system. Please only use the power supply supplied with the system to avoid permanent damages.
PLS	I/O	USB	USB connection from the X-Band IF to the pulse programmer. This USB port is connected to the internal USB hub of the X-Band IF system.
PC	I/O	USB	USB connection to remote PC.
GND	n/a	STUD	A ground (GND) post is located in the lower left corner of the back panel.