DRAKE MN2700 User Manual download pdf (Page 81)

Surge Impedance Again

• Zo = per unit length, equivalent circuit no loss

• Zo = for round coax

L/C

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∗

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log

138

• Why a particular impedance?

– Maximum power 30Ω, minimum loss 77Ω, max. voltage

breakdown 60Ω (1929 Bell Laboratories Study)

– Maximum power per pound of copper 52Ω (F. Terman?)

– Today 75Ω, 50Ω, 52Ω, 53.5Ω, 25Ω, 80Ω, 93Ω, etc.

3/12/2009 Larry Benko, W0QE 81

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1 2 ... 76 77 78 79 80 81

Antenna Tuners 1
(Antenna Couplers) 1
What is an Antenna Tuner? 2
Basics: Correct or Incorrect? 3
6/1/2011 Larry Benko, W0QE 4 4
6/1/2011 Larry Benko, W0QE 5 5
6/1/2011 Larry Benko, W0QE 6 6
6/1/2011 Larry Benko, W0QE 7 7
6/1/2011 Larry Benko, W0QE 8 8
Choices? 9
What do you really want/need? 10
Matching Network Components 11
DIY Coupler 12
Types of Tuners 13
Tying it all together 14
Voltages and Currents 16
Irms(max) 17
SWR Power Vpk(max) 17
“Small” Antenna Examples 19
What is the Smith Chart 20
Smith Chart Regions 21
6/1/2011 Larry Benko, W0QE 22 22
Sample Design Goals 23
Low Pass “L” Network 24
Type “A” 24
Type “B” 25
Low Pass “L” Network Results 26
High Pass “L” Network 27
Type “C” 27
Type “D” 28
High Pass “L” Network Results 29
Adding a 3 30
Component 30
Low Pass “Pi” Network 31
– Still good matching range 33
AntennaTransmitter 33
0.2-20uH 33
High Pass “Tee” Network 37
High Pass “Tee” 38
Fixed “L” High Pass 45
“Tee” Network 45
Both had minimal to moderate 48
Other Network Topologies 49
High Pass Differential 50
The End! 56
Other Topics 57
Does a Full Sized 58
Dipole Need 58
Matching? 58
Dipole Matching 59
6/1/2011 Larry Benko, W0QE 60 60
6/1/2011 Larry Benko, W0QE 61 61
6/1/2011 Larry Benko, W0QE 62 62
6/1/2011 Larry Benko, W0QE 63 63
– #12 wire up 40’ 64
– No feedline 64
– Pink dot = 1.8MHz 64
– 50’ of .66VF 50Ω 65
– 50’ of 600Ω lossless 66
V(Vin1) under I(R1) 67
V(Vout2) under I(R2) 67
No further 68
Smith Chart 70
Capacitor 71
Inductor 72
10MHz = Green 75
20MHz = Red 75
30MHz = Blue 75
2:1 Turns 77
Transformer 77
Surge Impedance Again 81

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DRAKE MN2700 User Manual Page 81

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