TNF200 Series Wideband Tuneable Notch Filters

FEATURES:

  • Easily adjustable, multi-turn tuner
  • High rejection at notch
    (typically 25 dB or better)
  • Wide passband, up to 3.0 GHz
  • Low Port VSWR
  • 13 Models cover 0.5 to 1300 MHz
  • 10 Watt power rating at notch
  • Small size
  • Rugged case and connectors
  • Low cost

Applications

Notch filters are useful in situations where a selected frequency must be attenuated while passing all others. Notch filters are commanly used to:
1. Increase dynamic range of spectrum analyzers.
2. Remove interfering signals in high gain amplifying systems.
3. Remove harmonics from signal sources or low power transmitters.
4. Prevent receiver overload in co-located repeater installations.
5. Identify or eliminate off-band interference at lower cost than cavity type filters.
6. Direct connection to communications transceivers for the purpose of suppressing out of band signals that are causing overload.

Application Note

The use of notch filters to enhance spectrum analzyer measurements is discussed in the application note:

"Spectrum Analyzer Measurements"

This note is available for downloading from this website in HTML format.

Description

The TNF200 is designed using carefully chosen parts in the tuned circuit to insure that there are no unwanted disturbances in the passband. The guarenteed passband is then specified; this is known as the MUF.

The TNF200s have a wide, deep notch which makes them unsuitable for use on inband signals, or signals that are close to the notched frequency. The main advantage of the TNF200 is the extremely wide useable frequency.

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Description-cont

The table on the next page lists the MUF for each filter in the TNF200 family. The TNF207, TNF208, TNF210 and the new TNF212 all use a diplexer system to pass the upper frequencies. By routing the notch filter thru the low pass filter section any parasitic notches from the tuned circuit are suppressed.
Due to the High "Q" circuitry, the notch depth is typically 25 db or greater. The notch width of the VHF models, as measured at the 15 dB attenuation points, is wide enough to suppress a modulated TV signal.
Because insertion loss is minimal, typically <0.5 dB, a TNF200 may be inserted for each unwanted signal, But when two unwanted frequencies are close together, one TNF200, tuned between the two frequencies, will suppress both signals. Another benefit of the high Q is a power handling capability of 25 watts of RF power.
The TNF200 is contained in a heavy-duty nickel plated brass enclosure providing excellent shielding. Stainless steel hardware and nickel plating prevent corrosion from dissimilar metal action. You can expect the unit to withstand many years of normal abuses of heavy use.

Quality

To insure that high quality is maintained each unit is thoroughly inspected both mechanically and electrically. Critical components are 100% inspected and tested before assembly into the units. All parameters are tested using the latest in advanced ATE. The unit is then subjected to shock, vibration and temperature extremes; after which it is retested to insure compliance.

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SPECIFICATIONS

Electrical:

Impedance: 50 ohm ±5%

Max Voltage: 100 V peak DC+AC

Note: at higher frequencies filter becomes power limited.

Ret Loss:

>10 dB or 2:1 VSWR in useable range

Insertion Loss:

<0.5 dB below 1.0 GHz
<1.0 dB below 2.0 GHz

NOTE: Insertion loss applies only to the max useable frequency of the filter.

Bandwidth (3 dB): See Table

Environmental:

Temperature:

0° to 70° C full specification

-55° to +125° C storage

Humidity

10% to 85% RH, Non-cond

Shock:

MIL-E-5400T

Vibration:

MIL-E-5400T

Mechanical:

Case size:

"A" 2"Wx2"Lx1.6H"

Weight:

<6 Oz.

Construction:

Can is of brass .025"; nickel plated to Mil-QQ-N-290; the connectors are of stainless steel or brass. All hardware is of stainless steel.

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SPECIFICATIONS-cont

Options

Connectors

"BF"

BNC Female

"BM"

BNC Male

"MF"

SMA Female

"NF"

N Female

"NM"

N Male

Test Data

Test data can be provided on passband and stopband, return loss, and group delay.

"TD"

test data plot

"COC"

Cert of Conformance

Ordering Information

Select the frequency range desired from the table to the left. The correct part number of the filter will be in the left hand column. Add the correct suffix for the type of connectors desired, see the table above.

Call the factory or authorized representative to place order.

Outline Drawing:

click on drawing for enlarged view.

TNF200 Series Individual Data Table

For test data: click on model number in table, if blue.

Model
No.

Range
Mhz

Max
MHz

Power

Notch Depth

Bandwidth

Pass

Notch

Low

High

Low

High

TNF20L1xx

0.5-0.9

25

25

10

20

20

10%

10%

TNF20L3xx

0.8-1.7

50

25

10

20

20

10%

10%

TNF201xx

1.5-2.5

50

25

10

24

24

15%

15%

TNF202xx

2.5-5.0

100

25

10

25

25

12%

12%

TNF203xx

5.0-10.0

100

25

10

27

24

18%

10%

TNF205xx

9.5-18.0

180

25

10

30

28

13%

10%

TNF207xx

15-30

600

50

10

24

22

10%

5%

TNF208xx

30-75

1000

50

10

28

23

10%

5%

TNF210xx

54-210

2100

50

20

33

26

20%

5%

TNF212xx

75-300

2100

50

20

33

26

20%

5%

TNF220xx

100-350

1600

50

20

35

32

26%

9%

TNF230xx

250-850

2500

50

20

38

33

30%

12%

TNF240xx

500-1300

2500

25

10

35

35

30%

13%

website: eagle-1st.com

email: sales@eagle-1st.com

Phone: 928 204-2597

PO Box 4300

fax: 928 204-2568

Sedona, AZ 86340

07 Jun 2005 css-a