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55 Questions

Views Newest Activity Votes

votes

answer

views

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

Dec 6 at 19:45 Phil Frost - W8II 35.3k

votes

answers

views

Vertical Yagi spun at 1000 RPM: gain properties?

antenna-theory

Oct 13 at 18:01 Kevin Reid AG6YO♦ 20k

vote

answers

449

views

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 631

votes

answer

408

views

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

antenna-theory

Oct 28 '18 at 2:30 Brian K1LI 4,717

vote

answers

390

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 Brian K1LI 4,717

votes

answers

363

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

1d ago Andrew 1,411

votes

answers

359

views

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

antenna-theory antenna-construction yagi

Feb 27 at 17:08 sm5bsz 631

votes

answer

355

views

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

transmission-line antenna-tuner

Sep 4 at 14:59 Chris K8NVH 808

votes

answers

351

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

Oct 23 at 22:13 Mike Waters♦ 5,502

votes

answer

329

views

What EXACTLY does front to back ratio mean?

antenna-theory

Feb 25 at 16:47 Glenn W9IQ 17.2k

votes

answers

309

views

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

rfi

Jan 22 at 2:25 Andrew 1,411

vote

answer

242

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 1,411

votes

answers

199

views

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

antenna-theory

Nov 7 '18 at 15:47 Phil Frost - W8II 35.3k

votes

answer

196

views

Will painting a 4 element 10 m yagi using conductive paint onto the side of a building work?

antenna-construction

Oct 11 at 8:45 Marcus Müller 9,125

votes

answers

194

views

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 '18 at 14:45 M0MPM 1

-1

votes

answer

189

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 17.2k

votes

answers

187

views

What does dBi mean?

antenna-theory

Feb 27 at 17:40 Kevin Reid AG6YO♦ 20k

votes

answers

184

views

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

antenna-theory electronics amplifier transmission-line

Aug 27 at 22:33 Mike Waters♦ 5,502

votes

answers

145

views

What is the main source of error for SWR meters?

transmission-line

May 27 at 22:55 Andrew 1,411

votes

answers

145

views

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

antenna-theory

Mar 2 at 9:52 Marcus Müller 9,125

votes

answers

142

views

Is double amplitude modulation useful?

modes electronics

Jul 27 at 16:24 Walter Underwood K6WRU 1,813

votes

answers

134

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 3,427

vote

answers

126

views

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

transmission-line swr-meter

Sep 8 at 13:55 user10489 1,059

votes

answer

121

views

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

antenna-theory ferrite

Mar 16 at 3:49 hobbs - KC2G 1,968

votes

answers

119

views

Are standing waves on a transmission line RF or DC?

antenna-theory transmission-line

Apr 10 at 14:29 Brian K1LI 4,717

votes

answers

119

views

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 1,487

votes

answers

114

views

Will using a 1:1 balun at the feedpoint of a center feed dipole result in no common mode current on the outside of the coax?

antenna-theory coaxial-cable dipole balun transmission-line

Sep 25 at 0:12 hotpaw2 6,634

votes

answers

108

views

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♦ 5,502

votes

answers

105

views

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

antenna-theory

Oct 31 '18 at 15:23 Glenn W9IQ 17.2k

votes

answers

102

views

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

antenna-theory dipole noise small-loop

Apr 10 at 17:00 Mike Waters♦ 5,502

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55 Questions

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

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 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?

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

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

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 EXACTLY does front to back ratio mean?

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

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

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

Will painting a 4 element 10 m yagi using conductive paint onto the side of a building work?

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

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

What does dBi mean?

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

What is the main source of error for SWR meters?

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

Is double amplitude modulation useful?

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

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

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

Are standing waves on a transmission line RF or DC?

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?

Will using a 1:1 balun at the feedpoint of a center feed dipole result in no common mode current on the outside of the coax?

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

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

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