75 Ohm Relay Programmable Attenuators

A programmable attenuator is a variable attenuator with a specific dB step size and total attenuation.  All of the models in this table are 75 Ohm impedance with electro-mechanical relay design.  The attenuation steps are controlled parallel control lines.  JFW has been designing, manufacturing, and delivering programmable attenuators for over 25 years.

Control Lines

The attenuators are available with either TTL or direct Voltage control. For direct Voltage control the DC voltages are typically +12Vdc, +15Vdc, +24Vdc, or +28Vdc.  These DC Voltages are applied to the control feedthru pins to activate an attenuation step. With no control applied the relay is failsafe to the thru path setting (i.e. 0dB). Activate multiple dB steps simultaneously to set combination attenuation values.  Example: to achieve 7dB of total attenuation activate the 1dB/2dB/4dB steps simultaneously.

For your specific application, please contact JFW or use our Inquiry Form.

JFW Model #	Impedance	dB Total	dB Step	Frequency Range	Switching Speed	RF Input Power	Control	RF Connectors
75P-022	75 Ohm	63 dB	1 dB	DC-1000 MHz	6 mS	1 Watt	+12 Vdc	BNC, F, N
75P-033	75 Ohm	127 dB	1 dB	DC-1000 MHz	6 mS	1 Watt	+12 Vdc	BNC, F, N
75P-089	75 Ohm	63.75 dB	0.25 dB	DC-500 MHz	6 mS	1 Watt	+12 Vdc	BNC, F, N
75P-093	75 Ohm	110 dB	10 dB	DC-1000 MHz	6 mS	1 Watt	+12 Vdc	BNC, F, N
75P-119	75 Ohm	63 dB	1 dB	DC-1000 MHz	6 mS	1 Watt	TTL	BNC, F
75P-135	75 Ohm	25.5 dB	0.1 dB	DC-1000 MHz	10 mS	0.5 Watt	TTL	BNC, F, N, TNC
75P-154	75 Ohm	63.75 dB	0.25 dB	DC-1000 MHz	10 mS	0.5 Watt	TTL	BNC, F, N, TNC
75P-155	75 Ohm	95.5 dB	0.5 dB	DC-1000 MHz	10 mS	0.5 Watt	TTL	BNC, F, N, TNC
75P-157	75 Ohm	95.5 dB	0.5 dB	DC-1000 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F, N, TNC
75P-163	75 Ohm	63.75 dB	0.25 dB	DC-1000 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F, N, TNC
75P-180	75 Ohm	64.5 dB	0.1 dB	DC-1000 MHz	10 mS	0.5 Watt	TTL	BNC, F, N, TNC
75P-186	75 Ohm	31 dB	1 dB	DC-1000 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F
75P-198	75 Ohm	31 dB	1 dB	DC-1218 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F, N, TNC
75P-199	75 Ohm	95 dB	1 dB	DC-2150 MHz	10 mS	0.5 Watt	+12 Vdc	F
75P-200	75 Ohm	63 dB	1 dB	DC-2150 MHz	10 mS	0.5 Watt	+12 Vdc	F
75P-201	75 Ohm	95.5 dB	0.5 dB	DC-1218 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F, N, TNC
75P-203	75 Ohm	95 dB	1 dB	DC-1218 MHz	6 mS	0.5 Watt	+12 Vdc	BNC, F, N, TNC
75P-224	75 Ohm	31.75 dB	0.25 dB	DC-2150 MHz	10 mS	0.5 Watt	+12 Vdc	BNC, F, N
75P-225	75 Ohm	63.5 dB	0.5 dB	DC-2150 MHz	10 mS	0.5 Watt	+12 Vdc	BNC, F, N