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Radial Type Helical Filters
7HW 7HT
TYPE
7HW Double Tuned 7HT Triple Tuned
Frequency Range: 350MHz~1.2GHz RoHS compliant
7HW
8Max. 1Max. 0.5
7HT
8Max. 1Max. 0.5
*14.7Max.
3.7 3.2
0.5
4.5
*14.7Max.
3.7 3.2
0.5 1
4.5 22.5Max. 4.5
15.2Max.
14.6
4.5
11.8
7.3
3.5
1
3.5
(Unit: mm)
1
4.5 (Unit: mm)
*
Features
Either 11 or 12.9mm height is possible.
* Compact low-profile helicalfolters, ideal for mobile communications equipment. * RoHS compliant Examples of 900MHz frequency response
252HXPK-2709F Test circuit
45 18 R1 R2
* * Typical characteristic for MCA radio use
302HXPK-1278B Test circuit R1=R2=50
R1 2 1 7 11 10 8 R2
ANTENNA CIRCUIT FILTER 302MXPR-1077E R1=R2=50
Attenuation(dB) BANDWIDTH
0 0
SELECTIVITY Attenuation(dB)
BOTTOM VIEW
BANDWIDTH
0 0
4
20
BANDWIDTH
8 fo : 855MHz IL : 1.5dB 20 10 0 10 20
40
2
2
12
60
Attenuation(dB)
200
100
0
100
Attenuation(dB)
Frequency(MHz)
4
Frequency(MHz)
4 fo:904MHz IL:1dB
6
6
RF CIRCUIT FILTER 252HXPK-2674F
8 fo:904MHz IL:2.5dB
8
20
10
0
10
20 10
BANDWIDTH
0 0
SELECTIVITY Attenuation(dB)
Frequency(MHz)
Frequency(MHz) SELECTIVITY
0 0
Attenuation(dB)
20
10
0
10
20
2
20
SELECTIVITY
4 fo : 859.5MHz IL : 2.5dB 6 20 10 0 10 20
40
Attenuation(dB)
10
20
60
120
60
0
60
120
Attenuation(dB)
Frequency(MHz)
40
Frequency(MHz)
20 (dB) 0 30 10 20 100 50 0 50 100 Return Loss
60
LOCAL FILTER 252HXPK-273F
80
BANDWIDTH
100 0 200 100 0 100 200 0
SELECTIVITY Attenuation(dB)
Frequency(MHz)
Frequency(MHz)
Attenuation(dB)
2
20
4 fo : 910MHz IL : 1.2dB 6 20 10 0 10 20
40
60
400
200
0
200
400
Frequency(MHz)
Frequency(MHz)
continued on next page
4.5 18.9
200
Helical Filters
continued from previous page
TYPE
7HW 7HT
SELECTION GUIDE FOR STANDARD FILTERS
TYPE 7HW (Double tuned)
TOKO Part Number 7HW-35515A-360 7HW-36020A-370 7HW-37020A-380 7HW-38025A-390 7HW-39525A-410 7HW-40525A-420 7HW-42025A-435 7HW-43525A-450 7HW-45025A-460 7HW-46025A-475 7HW-47530A-490 7HW-49030A-505 7HW-51030A-525 Center Frequency (MHz) 360 370 380 390 410 420 435 450 460 475 490 505 525 Bandwidth (-1dB) (MHz) Min. 7.0 7.0 7.0 7.0 7.0 8.0 8.0 8.0 8.0 8.0 10.0 10.0 10.0 Selectivity Fo - 50MHz Fo + 50MHz (dB) Min. (dB) Min. 35 25 35 25 35 20 28 20 25 18 25 25 25 20 20 18 18 14 18 18 18 16 16 14 14 12 Ripple (dB) Max. 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Insertion Loss (dB) Max. 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0
TYPE 7HT (Triple tuned)
TOKO Part Number 302MXPR-1138D 302MXPR-1137D 302MXPR-1136D 302MXPR-1109D 302MXPR-1110D 302MXPR-1108D 302MXPR-1119D 302HXPK-1111B Center Frequency (MHz) 370 390 410 415 465 500 680 833 Bandwidth (-1dB) (MHz) Min. *6.0 *7.0 *8.0 13.0 12.0 13.0 10.0 *18.0 *Bandwidth: 13dB Selectivity Fo - ( )MHz Fo + ( )MHz (dB) Min. (dB) Min. 35(30) 30(30) 30(30) 25(30) 30(30) 25(30) 40(50) 30(50) 40(50) 30(50) 36(50) 43(50) 30(50) 27(50) 34(50) 23(50) Ripple (dB) Max. 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Insertion Loss (dB) Max. 4.5 4.0 3.5 3.5 4.0 3.5 4.5 4.0
Test circuits
7HW
"A"
OUT
7HW
"F"
7HT
"D"
OUT
4 IN
5
IN
2
5 OUT
5
6
7
1
8
1
6
IN
1
12
10
Zin=Zout=50
Zin=Zout=50
Zin=Zout=50
7HT
IN
"B"
7HT
IN
"E"
2
4
5
7
2
7
1
8
OUT
1
11
10
8
OUT
Zin=Zout=50
Zin=Zout=50
(BOTTOM VIEW)

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