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The length of a tubular filter is determined by adding the connector dimensions from the table below. The filter length is obtained from the Length vs. Frequency tables.

Example:
 A 5-section bandpass filter Model BC with a center frequency of 300 MHz and with SMA connectors has a filter dimension of 3.4" and a connector dimension of 0.8 inches. The total length is 5.0 inches.
Connector Dimensions
Connector
Style
Connector
Code
Connector Dimension (Inches)
.25 Diameter
.50 Diameter
.75 Diameter
1.25 Diameter
Figure
"N" Female
N
NR*
1.28
1.4
1.7
-
"N" Male
NM
NR*
1.23
1.31
1.65
-
BNC Female
B
NR*
1.0
1.35
1.42
-
BNC Male
BM
NR*
.93
1.45
1.35
-
TNC Female
T
NR*
1.0
1.35
1.42
-
TNC Male
TM
NR*
.93
1.45
1.35
-
SMA Female
(Standard)
S
.6
.8
.8
.8
1
SMA Male
(Standard)
SM
.73
.85
.85
.85
1
SMA Male
(Right Angle Square)
EP
.55
.65
.65
.65
2

NR - Not recommended for PC mount
Contact factory
Standard connector dimensions are in inches, please use 25.4 to convert to metric.


BA - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
200-300
300-400
400-1000
1000-3000
3000-4000
4000-5000
2
1.10
1.00
.90
.80
.70
.50
3
2.00
1.90
1.40
1.20
1.00
.70
4
2.90
2.80
1.90
1.70
1.30
.90
5
3.80
3.60
2.40
2.10
1.60
1.10
6
4.70
4.40
2.90
2.5
1.90
1.30
7
5.60
5.20
3.40
2.90
2.20
1.60
8
6.50
6.00
3.90
3.30
2.50
1.90

Dimensions Approximate

BC - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
75-130
130-180
180-350
350-700
700-2500
2
2.00
1.60
1.30
1.10
.90
3
3.15
2.60
2.00
1.65
1.40
4
4.30
3.60
2.70
2.20
1.95
5
5.45
4.55
3.40
2.70
2.45
6
6.60
5.55
4.10
3.25
3.00
7
7.75
6.55
4.80
3.80
3.50
8
8.90
7.55
5.50
4.35
4.00
9
-
8.55
6.20
4.90
4.55
10
-
9.50
6.90
5.40
5.00

Dimensions Approximate

BD - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
50-140
140-230
230-500
500-1500
2
2.00
1.50
1.30
1.10
3
3.00
2.25
1.85
1.60
4
3.95
3.00
2.40
2.10
5
4.90
3.75
2.95
2.60
6
5.90
4.50
3.50
3.10
7
6.85
5.25
4.10
3.60
8
7.80
6.00
4.60
4.10
9
8.80
6.75
5.15
4.60
10
-
7.50
5.70
5.10

Dimensions Approximate

BE - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
50-80
80-200
200-400
400-500
2
2.80
2.40
2.00
1.60
3
3.80
3.20
2.80
2.30
4
4.80
4.00
3.60
3.00
5
6.00
5.20
4.40
3.80
6
7.20
5.60
5.20
4.60
7
8.40
6.40
6.00
5.40
8
9.60
7.20
6.80
6.20
9
-
8.60
7.60
7.00
10
-
-
8.50
7.80

Dimensions Approximate

LA - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
300-600
600-1000
1000-1300
1300-1700
1700-2300
2300-3000
3000-5000
5000-20000
2
.65
.55
.40
.50
.45
.40
.40
Contact factory
for exact size at
higher frequencies.
3
1.00
.90
.70
.85
.75
.70
.75
4
1.45
1.25
1.00
1.20
1.10
1.00
1.50
5
1.90
1.65
1.30
1.55
1.40
1.30
1.40
6
2.30
2.00
1.60
1.95
1.70
1.55
1.75
7
2.75
2.40
1.90
2.30
2.00
1.85
2.10
8
3.20
2.75
2.20
2.65
2.35
2.15
2.45
9
3.65
3.10
2.50
3.00
2.70
2.45
2.80
10
4.10
3.50
2.80
3.35
3.00
2.75
3.10

Dimensions Approximate

LC - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
60-90
90-150
150-200
200-400
400-800
800-3000
2
2.10
1.80
1.55
1.10
.75
.65
3
3.15
2.80
2.45
1.80
1.20
1.10
4
4.20
3.85
3.40
2.55
1.70
1.50
5
5.6
4.85
4.30
3.25
2.15
1.95
6
6.9
5.90
5.20
3.95
2.60
2.40
7
8.3
6.95
6.15
4.70
3.00
2.80
8
9.6
7.95
7.00
5.40
3.50
3.25
9
10.88
8.95
8.00
6.10
3.95
3.70
10
-
-
8.90
6.80
4.40
4.10

Dimensions Approximate

LD - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
50-100
100-200
200-400
400-600
600-1000
1000-2000
2
2.20
2.00
1.20
1.00
.90
.80
3
3.50
3.15
2.00
1.60
1.35
1.25
4
4.75
4.30
2.70
2.15
1.80
1.65
5
6.00
5.40
3.40
2.70
2.25
2.00
6
7.30
6.50
4.10
3.25
2.70
2.45
7
8.60
7.65
4.90
3.85
3.15
2.85
8
-
8.75
5.55
4.40
3.60
3.30
9
-
-
6.40
5.00
4.00
3.70
10
-
-
7.00
5.50
4.50
4.10

Dimensions Approximate

LE - Filter Length vs. Frequency
No. of Sections
Frequency (MHz)
50-80
80-200
200-600
600-1000
2
2.40
2.00
1.30
1.00
3
3.55
2.85
2.00
1.55
4
4.75
3.70
2.60
2.00
5
6.00
4.55
3.25
2.60
6
7.15
5.40
3.90
3.10
7
8.35
6.25
4.55
3.65
8
9.50
7.10
5.20
4.20
9
-
7.95
5.85
4.70
10
-
8.80
6.50
5.20

Dimensions Approximate

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©2008, Lorch Microwave