Brickwall Low Pass Filters

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ULTRA SHARP CUTOFF MINIATURE LOW PASS VIDEO BRICKWALL FILTER

The ABW Series Miniature Broadcast Quality Brickwall Low Pass Filters were designed with original equipment manufacturers in mind. Their miniature size and superior performance will enhance any analog or digital television, RF or microwave product.

Applications

These ultra sharp low pass cutoff filters are designed to improve analog and digital television signal by reducing interference from higher frequency subcarriers. Some application are:

NTSC and PAL video systems
ENG microwave system
Microwave and studio equipment
Roofing filters
Low pass filtering of audio from video signals
Removing out-of-band interference
Eliminating audio buzz caused by audio sub-carriers

Key Features and Benefits

	Ultra sharp low pass cutoff filter with greater than 42dB attenuation
	Stopband ratio = 1.066 x Fc (end of passband ripple frequency)
	ABW-4P20 will pass 4.2 MHz and give greater than 42dB rejection at 4.48 MHz
	Cutoff frequency available from 2 MHz to 8 MHz
	Phase & Delay equalized over 92.8% of the passband
	75 Ohm impedance
	Good return loss. Greater than 20 dB
	Available in open or closed-box construction

Description

	Ultra sharp cutoff video low pass filter available in open or closed box construction.
	For boxed unit (closed construction) replace "P" with "B" in part number. Example: ABW-4P20-B

Performance

Passband Flatness from 100KHz

Less than .15 dB peak to peak

Insertion Loss at 100 KHz

5 dB max.

Impedance

75 Ohms

Return Loss

Greater than 20 dB

Group Delay Ripple

±10 nanoseconds max.*

Stopband Attenuation

42 dB min. to over 100 MHz

Stopband Ratio @ 42 dB

1.066 x F_c **

Operating Temperature

+32° to +150°F (0° to +65°C)

* ABW-2P00 = ±15 nanoseconds max.

** F_c= end of passband frequency

Part Number	End of Passband Ripple (MHz)	Start of Stopband (42 dB); Reference Frequency 100 KHz (MHz)	Group Delay Ripple		Nominal Propagation Delay (microseconds)
Part Number	End of Passband Ripple (MHz)		nsec to	(MHz)	Nominal Propagation Delay (microseconds)
ABW-2P00-P	2.00	2.13	30	1.85	3.045
ABW-4P20-P	4.20	4.48	20	3.90	1.450
ABW-4P49-P	4.49	4.79	20	4.17	1.356
ABW-5P00-P	5.00	5.33	15	4.64	1.218
ABW-5P10-P	5.10	5.44	15	4.73	1.190
ABW-5P40-P	5.40	5.76	15	5.01	1.130
ABW-5P56-P	5.56	5.93	15	5.16	1.095
ABW-6P00-P	6.00	6.40	15	5.57	1.015
ABW-6P80-P	6.80	7.25	15	6.31	0.895
ABW-8P40-P	8.40	8.95	15	7.80	0.725
Performance Data Typical Response Curves: ABW-4P20


Package Dimensions