User Andrew

1

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2

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332

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Why does a Class-C non-linear power amp distort SSB but does not distort AM?

Dec 16 at 4:02 sm5bsz 571

0

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1

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304

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How does a gamma match on a dipole work as a balun?

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Oct 28 at 2:30 Brian K1LI 3,923

1

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2

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300

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Exactly why do some SWR meters give a changing reading depending on the length of coax used to connect to an antenna?

antenna-theory impedance-matching transmission-line math

Nov 6 at 20:15 Brian K1LI 3,923

8

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3

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285

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How can the voltage at the center of a resonant half wave dipole be zero if the input impedance is 75 ohms?

antenna-theory impedance dipole math

Nov 12 at 0:51 Cecil - W5DXP 1,485

2

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4

answers

231

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How can the impedance of a half wave dipole at its resonant frequency be purely resistive when the voltage and current are seemingly not in phase?

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Jan 29 at 3:08 Andrew 427

3

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3

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204

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Feb 27 at 17:08 sm5bsz 571

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196

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How can I get rid of RFI coming from my house solar panel inverter?

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Jan 22 at 2:25 Andrew 427

2

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2

answers

185

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Can anyone tell me how to make a 35 m long wire antenna work on 80, 40, 20, 15 and 10 metres?

wire-antenna dipole antenna-tuner

Dec 7 at 14:45 M0MPM 1

0

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1

answer

184

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What EXACTLY does front to back ratio mean?

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Feb 25 at 16:47 Glenn W9IQ 16.8k

3

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4

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177

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What is the voltage on a half wave dipole measured with respect to?

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Nov 7 at 15:47 Phil Frost - W8II 31.3k

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2

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155

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What does dBi mean?

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Feb 27 at 17:40 Kevin Reid AG6YO♦ 18.1k

-1

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1

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148

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Is it legal to transmit scrambled or encrypted voice via SSB on ham bands?

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3

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2

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141

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What is the main source of error for SWR meters?

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May 27 at 22:55 Andrew 427

2

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3

answers

133

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Is double amplitude modulation useful?

modes electronics

Jul 27 at 16:24 Walter Underwood K6WRU 1,803

1

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1

answer

128

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Which polarization for a Yagi antenna will have the best side rejection for received signals with vertical polarization?

antenna-theory polarization

Jan 15 at 0:03 Andrew 427

3

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4

answers

116

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Ham operators often tell me that comparing gain to an isotropic radiator isn't much use because it's only a theoretical antenna, is this true?

antenna-theory radiation-pattern

Mar 15 at 13:08 Richard Fry 1,082

0

votes

1

answer

105

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Can I make ferrite paint? Will it shield my antenna from my roof?

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Mar 16 at 3:49 hobbs - KC2G 1,295

2

votes

3

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102

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Are standing waves on a transmission line RF or DC?

antenna-theory transmission-line

Apr 10 at 14:29 Brian K1LI 3,923

0

votes

2

answers

101

views

Does a vertically or horizontally polarized electromagnetic wavefront have a thickness?

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Oct 31 at 15:23 Glenn W9IQ 16.8k

1

vote

3

answers

93

views

If the voltage at the center of a half wave dipole isn't zero, then how do Plumber's Delight yagi antennas work?

antenna-theory

Nov 12 at 1:55 Cecil - W5DXP 1,485

0

votes

2

answers

91

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How can a vertical Yagi for 10 m be mounted on on a vertical metal mast and be made to work properly?

antenna-theory antenna-construction yagi

Mar 4 at 14:16 Mike Waters♦ 4,588

2

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2

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90

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Is there any difference in the voltage and current distribution for a half wave dipole fed in the middle, or fed with a gamma match?

antenna-theory

Nov 14 at 15:09 Cecil - W5DXP 1,485

0

votes

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answers

87

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Does a horizontally polarised yagi antenna have the same front to back ratio for horizontal and vertical received signals?

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Oct 30 at 4:47 tomnexus 3,188

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What is the theoretical and actual cross polarization attenuation from horizontal to vertical polarization?

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If I point a yagi antenna at the sky, what will its azimuth radiation pattern look like?

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What happens to the transmitted power cancelled out by a yagi antenna's reflector?

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Jan 29 at 5:43 muralidharaB 1

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How can the output power of a Yaesu FT101E be increased?

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Why does an RF Amplifier fail when the SWR is high?

antenna-theory electronics amplifier transmission-line

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rf-power antenna-system electronics impedance-matching amplifier

14h ago MagnusO_O 96

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31 Questions

Why does a Class-C non-linear power amp distort SSB but does not distort AM?

How does a gamma match on a dipole work as a balun?

Exactly why do some SWR meters give a changing reading depending on the length of coax used to connect to an antenna?

How can the voltage at the center of a resonant half wave dipole be zero if the input impedance is 75 ohms?

How can the impedance of a half wave dipole at its resonant frequency be purely resistive when the voltage and current are seemingly not in phase?

What happens to a vertical Yagi when you mount it on a vertical metal pole?

How can I get rid of RFI coming from my house solar panel inverter?

Can anyone tell me how to make a 35 m long wire antenna work on 80, 40, 20, 15 and 10 metres?

What EXACTLY does front to back ratio mean?

What is the voltage on a half wave dipole measured with respect to?

What does dBi mean?

Is it legal to transmit scrambled or encrypted voice via SSB on ham bands?

What is the main source of error for SWR meters?

Is double amplitude modulation useful?

Which polarization for a Yagi antenna will have the best side rejection for received signals with vertical polarization?

Ham operators often tell me that comparing gain to an isotropic radiator isn't much use because it's only a theoretical antenna, is this true?

Can I make ferrite paint? Will it shield my antenna from my roof?

Are standing waves on a transmission line RF or DC?

Does a vertically or horizontally polarized electromagnetic wavefront have a thickness?

If the voltage at the center of a half wave dipole isn't zero, then how do Plumber's Delight yagi antennas work?

How can a vertical Yagi for 10 m be mounted on on a vertical metal mast and be made to work properly?

Is there any difference in the voltage and current distribution for a half wave dipole fed in the middle, or fed with a gamma match?

Does a horizontally polarised yagi antenna have the same front to back ratio for horizontal and vertical received signals?

What is the theoretical and actual cross polarization attenuation from horizontal to vertical polarization?

Does a loop antenna have less susceptibility to atmospheric noise than an open ended antenna?

If I point a yagi antenna at the sky, what will its azimuth radiation pattern look like?

What happens to the transmitted power cancelled out by a yagi antenna's reflector?

How can the output power of a Yaesu FT101E be increased?

Why does an RF Amplifier fail when the SWR is high?

How does the Maximum Power Transfer Theorem relate to RF power amplifiers?