Applications

These filters are ideally suited for signal processing, low power transmitters or harmonic filters. For signal processing applications where high dynamic range is required these filters are ideal. The high power rating and careful design yields extremely high intercept points.
The sharp cutoff makes this filter ideal for harmonic suppression. It reaches cutoff at 50 dB at no more than 1.3 times Fc. A 120 Mhz filter would be useable from 78 Mhz to 120 Mhz with the 2nd harmonic suppressed at least 50 dB.
The stop-band is rated at >50 dB to at least 6 times the cutoff frequency. This wide suppression width makes the filters useful for receiver front end protection from co-located transmitters in adjacent frequency bands.

Description

The CBL series of low-pass filters are carefully designed to yield high performance in a small package.
The electrical design is a traditional chebychev that is optimized to utilize parasitic components (such as series inductance) to improve performance. All capacitors are surface mount with low loss porcelain dielectric for maximum circuit Q. In addition, all inductors are carefully designed for maximum Q. The use of high saturation magnetics improves the intercept point and the power rating. At low signal levels (<+20 dBM) the intermodulation distortion is excellent.
The CBL filters also are available with a splash proof option. This will allow the filters to be mounted out of doors or on an open vehicle such as an APC or Humvee.

Description-continued

Several different types of connectors are available at nominal extra cost. These include BNC, SMA and N. If a special connector arrangement is desired please contact the factory.
The CBL filters are contained in a heavy-duty nickel plated brass enclosure providing excellent shielding against magnetic and electrical signals. Stainless steel hardware and nickel plating prevent corrosion from dissimilar metal action. You can expect the unit to withstand many years of the normal abuses of heavy use. For economy, the case is a folded and welded construction rather than a machined can.

Quality

To insure that high quality is maintained each unit is thoroughly inspected both mechanically and electrically. All units are aged and then retested to insure superior stability over the lifetime of the instruments.

Availability

These filters are normally stock items: 1 week delivery. Special orders or large quantities usually require 2-4 weeks.

Specifications

Please see the next page for detailed specifications, performance graphs and ordering information.

SPECIFICATIONS

Electrical

Impedance:

50 ohm ± 5%

Power Rating:

100 watts cont.

Voltage Rating:

150V DC+AC

Insertion Loss:

<0.5 dB

Environmetal

Temperature:

-20 to +70 C operating
-55 to +125 C storage

Humidity:

10-85% RH, non-cond

Shock:

Mil-E-5400T

Vibration:

100 G any Axis

Waterproof:

No

Mechanical

Case Size:

Weight:

<6.0 Oz

Construction:

Can is of brass .025"; electroless nickel plated to Mil-C-26074. Connectors are stainless steel or brass. All hardware is stainless steel.

Options

Connectors

"BF"

BNC female Standard

"MF"

SMA female

"NF"

N female Standard

"NM"

N male

Test Data:

Test data can be provided on pass band and stop band, return loss, and group delay.

TD

Test Data Plots

COC

Certificate of Conformance

Ordering Information

Select the cutoff frequency desired from the above table. Add the proper suffix for the type of connectors desired.
Call the factory or authorized representative to place the order.

SPECIFICATIONS-cont

Standard Cutoff Frequencies

The standard frequencies and associated cutoff and stop band frequencies are noted in this table.
Note: any cutoff frequency in this range may be had as an option. The xxxx after the part number specifies the desired connectors.

Model
Number

Cutoff
MHz

Stop
Mhz

Upper
Stop

CBL121xxxx

120

156

720

CBL151xxxx

150

195

900

CBL181xxxx

180

234

1080

CBL221xxxx

220

286

1300

CBL241xxxx

240

312

1450

CBL271xxxx

270

350

1620

CBL301xxxx

300

390

1800

CBL331xxxx

330

428

2000

CBLxxxx

CBLxxxx

CBLxxxx

CBLxxxx

CBLxxxx

Outline Drawing

Click on drawing for enlarged view