User Andrew

4

19

votes

3

answers

3k

views

Why do amateur radio operators call an RF choke a balun?

Sep 13 at 16:32 natevw - AF7TB 5,571

11

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3

answers

2k

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

rfi

Oct 29 '20 at 12:28 Francis Archibald 31

3

votes

3

answers

2k

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

antenna-theory antenna-construction yagi

Feb 27 '19 at 17:08 sm5bsz 794

1

4

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3

answers

2k

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Vertical Yagi spun at 1000 RPM: gain properties?

antenna-theory

Apr 23 '20 at 5:42 hotpaw2 10.8k

2

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2

answers

1k

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

electronics amplifier ssb am

Dec 16 '18 at 4:02 sm5bsz 794

1

7

votes

4

answers

997

views

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

Aug 27 at 23:56 Andrew 2,989

0

votes

2

answers

946

views

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

antenna-theory

Mar 2 '19 at 9:52 Marcus Müller 12.6k

0

votes

1

answer

942

views

What EXACTLY does front to back ratio mean?

antenna-theory

Feb 25 '19 at 16:47 Glenn W9IQ 18k

1

vote

1

answer

936

views

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

antenna-theory polarization

Jan 15 '19 at 0:03 Andrew 2,989

1

vote

1

answer

890

views

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

antenna-theory

Oct 28 '18 at 2:30 Brian K1LI 7,625

1

vote

2

answers

844

views

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 '18 at 20:15 CommunityBot 1

4

votes

4

answers

830

views

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

antenna-theory electronics amplifier transmission-line

Aug 27 '19 at 22:33 Mike Waters♦ 7,374

2

votes

6

answers

649

views

For a half wave dipole antenna, what's the value of the reactances that cancel out when the antenna is resonant?

antenna-theory dipole

Sep 16 at 0:31 rclocher3♦ 8,058

4

votes

5

answers

643

views

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?

antenna-theory dipole impedance

Aug 29 at 10:37 Andrew 2,989

0

votes

2

answers

619

views

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

antenna-theory

Oct 30 '18 at 4:47 tomnexus 6,343

0

votes

1

answer

567

views

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

united-states ssb encryption

Dec 5 '18 at 10:38 Glenn W9IQ 18k

1

vote

3

answers

511

views

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

rf-power antenna-system electronics impedance-matching amplifier

Aug 26 at 14:39 Kevin Reid AG6YO♦ 22.2k

2

votes

4

answers

500

views

Does a resonant antenna work better than a non-resonant antenna?

antenna-theory

Jun 15 '20 at 16:03 Richard Fry 2,772

3

votes

3

answers

396

views

Confusion about dipole standing waves and feed point impedance

antenna-theory transmission-line

Jul 3 '20 at 10:27 Andrew 2,989

4

votes

1

answer

389

views

Does an antenna tuner remove standing waves from a transmission line?

transmission-line antenna-tuner

Sep 4 '19 at 14:59 Chris K8NVH 1,002

-2

votes

2

answers

346

views

How can a half wave dipole which has an impedance of 73 + j43 ohms ever be resonant?

antenna-theory

Jul 9 '20 at 22:41 Andrew 2,989

3

votes

2

answers

341

views

What are the advantages for a receiver that uses an IF compared to direct conversion?

electronics

Sep 10 '19 at 2:38 Scott Earle♦ 4,206

3

votes

4

answers

337

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

antenna-theory

Nov 7 '18 at 15:47 Phil Frost - W8II 49k

2

votes

3

answers

317

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Are standing waves on a transmission line RF or DC?

antenna-theory transmission-line

Apr 10 '19 at 14:29 Brian K1LI 7,625

0

votes

3

answers

315

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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? [duplicate]

antenna-theory antenna-construction yagi

May 26 '20 at 17:25 Laurin Cavender 1

4

votes

2

answers

314

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Does the output of a BFO for a short wave receiver have to be exactly a sine wave?

receiver ssb

Aug 6 '20 at 2:46 Mike Waters♦ 7,374

1

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309

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Does the impedance along a transmission line change when there are standing waves?

transmission-line swr-meter

Sep 8 '19 at 13:55 user10489 3,379

-5

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4

answers

277

views

Exactly what is the cause for the zero reactance seen in the impedance at the center feed point of a resonant half wave dipole?

antenna-theory dipole transmission-line

Dec 4 at 23:05 Andrew 2,989

2

votes

2

answers

269

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What does dBi mean?

antenna-theory

Feb 27 '19 at 17:40 Kevin Reid AG6YO♦ 22.2k

3

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2

answers

268

views

What is the main source of error for SWR meters?

transmission-line

Dec 21 at 22:02 TGlennon 1

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80 Questions

Why do amateur radio operators call an RF choke a balun?

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

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

Vertical Yagi spun at 1000 RPM: gain properties?

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

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

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

What EXACTLY does front to back ratio mean?

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

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?

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

For a half wave dipole antenna, what's the value of the reactances that cancel out when the antenna is resonant?

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?

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

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

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

Does a resonant antenna work better than a non-resonant antenna?

Confusion about dipole standing waves and feed point impedance

Does an antenna tuner remove standing waves from a transmission line?

How can a half wave dipole which has an impedance of 73 + j43 ohms ever be resonant?

What are the advantages for a receiver that uses an IF compared to direct conversion?

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

Are standing waves on a transmission line RF or DC?

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

Does the output of a BFO for a short wave receiver have to be exactly a sine wave?

Does the impedance along a transmission line change when there are standing waves?

Exactly what is the cause for the zero reactance seen in the impedance at the center feed point of a resonant half wave dipole?

What does dBi mean?

What is the main source of error for SWR meters?