21-204214-210 Amphenol, 21-204214-210 Datasheet - Page 9

• Manufacturer Part Number: 21-204214-210
• Description: Circular MIL / Spec Connectors PT Series MIL-DTL-26482 I
• Manufacturer: Amphenol
• Series: FPT Seriesr

Specifications of 21-204214-210

• Mil Type: MIL-DTL-26482
• Product Type: Connectors
• Shell Style: Receptacle
• Shell Size: 14
• Insert Arrangement: 14-21
• Mating Style: Threaded
• Mounting Style: Panel
• Shell Plating: Electroless Nickel
• Mounting Angle: Straight
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Impedance Matching Formula
(your system to a 50 ohm system)
The following formula and example are offered in order to deter-
mine the expected filter performance in an impedance system
other than 50 ohms.
With the attenuation expressed in 50 ohms and the transfer
impedance curve shown in Figure 1 below, a designer can
relate the expressed attenuation to the input and output imped-
ance of his circuit.
Example:
Formula (Taken from Figure 1):
120
(1)
(2)
(3)
1.4 x 10
for 65 dB in a 50 ohm system
140
100
80
60
40
20
10
0
Noise is 40dB above specification level at 100 MHz
Input and output impedance are 10 and 100 ohms
respectively
Amphenol
attenuation at 100 MHz and +25°C
-4
2
= transfer impedance
®
VHF 7000 pf filter has a 65 dB minimum
10
Attenuation vs Transfer Impedance in 50 Ohm System
-3
Transfer Impedance - Z
10
-2
Figure 1
7
Atten (dB) = 20 log
Atten = filter performance in a system other than 50 ohms
Atten (dB) = 20 log
Attenuation = 56.3dB
In this case, the 7000 pf VHF filter will give 56.3 dB which is
16.3dB below the desired reduction in noise (40dB) as stated in
the above problem.
Z
Z
Z
S
L
12
10
= load impedance
= source impedance
12
= transfer impedance
-1
Ohms
10
10
1 +
1 +
1.4 x 10
10
Z
12
(Z
-0
Z
S
S
10(100)
Z
–2
+ Z
L
(10 + 100)
L
)
10
1