User Phil Frost - W8II - Amateur Radio Stack Exchange

42 votes

Effect of different metals for antenna elements

answered Feb 6, 2014 at 16:33

39 votes

Using a balun with a resonant dipole

antenna wire-antenna balun

answered Nov 5, 2013 at 14:17

38 votes

FCC sends "Notice of Dismissal" with quite threatening language just for denial of a vanity callsign?

fcc

answered May 11, 2021 at 13:49

27 votes

Accepted

Which HF bands are best during the day and which are better at night?

hf propagation

answered May 3, 2014 at 11:22

26 votes

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

antenna-theory balun jargon choke-balun

answered Dec 5, 2019 at 22:47

25 votes

Is it illegal to key up and not identify?

united-states legal procedure repeater

answered Jun 2, 2014 at 1:11

22 votes

Accepted

Is free space path loss dependent on frequency?

propagation math

answered Mar 12, 2015 at 11:59

19 votes

Accepted

What is the effect of using different number of radials with ground plane antenna

antenna radial

answered Mar 7, 2015 at 13:58

19 votes

What is a Gamma match in the context of the driven element of a Yagi antenna?

antenna antenna-theory dipole impedance-matching yagi

answered Jun 17, 2014 at 15:05

19 votes

Accepted

How can I protect equipment against a lightning strike?

safety weather equipment-protection lightning

answered Feb 27, 2014 at 1:42

19 votes

Accepted

Why do repeaters use cavity filters?

repeater filter

answered Dec 5, 2013 at 22:10

19 votes

Accepted

Is there a simple, DIY, antenna suitable for HF receive only?

antenna hf diy

answered Dec 13, 2013 at 20:42

18 votes

Accepted

Can I reduce RFI/noise at the antenna?

antenna hf rfi snr

answered Nov 7, 2013 at 18:17

18 votes

Accepted

SDR sampling bandwidth - do the bits per sample matter?

software-defined-radio diy theory electronics

answered Nov 7, 2013 at 18:35

17 votes

Using a balun with a resonant dipole

antenna wire-antenna balun

answered Nov 6, 2013 at 13:53

16 votes

Accepted

Are antennas circuits?

antenna theory antenna-theory

answered Jan 17, 2015 at 1:56

15 votes

How to detect common-mode currents or “RF in the shack”?

rfi grounding antenna-construction equipment-design testing

answered Jan 22, 2014 at 21:25

15 votes

Accepted

What is a linear RF amplifier?

amplifier

answered Jan 27, 2014 at 23:51

15 votes

Accepted

What does a noise blanker really do, and what are the side effects?

hf noise-blanker

answered Dec 20, 2013 at 16:09

15 votes

Accepted

If two antennas of 50 Ω and 377 Ω have VSWR=1:1, then which one is more efficient?

antenna impedance antenna-theory

answered Jan 12, 2014 at 15:10

14 votes

How do I separate dovetailed PowerPole housings?

connectors dc-power

answered Apr 19, 2016 at 16:01

14 votes

Accepted

How can I calculate the effects of an LNA, antenna gain, etc. on noise performance?

noise math

answered Jan 31, 2018 at 17:01

14 votes

Accepted

How Could Superheterodyne Receiver Ever Work?

receiver equipment-design mixer superheterodyne

answered Jun 20, 2018 at 16:49

14 votes

Accepted

How to reduce RF in the shack when using vertical HF antenna (no radials)

hf vertical-antenna rfi

answered Nov 7, 2013 at 16:42

14 votes

What is the relationship between SWR and receive performance?

antenna impedance antenna-theory

answered Dec 2, 2013 at 19:29

13 votes

Accepted

Why do we use decibels in radio?

theory

answered Sep 14, 2016 at 15:47

13 votes

Accepted

How does moving a feedpoint off-center in a dipole affect the resonant frequency and resistive load?

antenna impedance dipole antenna-theory

answered Oct 29, 2013 at 23:44

13 votes

Accepted

SDR: Quadrature demodulation vs direct RF sampling

software-defined-radio rtl-sdr direct-conversion

answered Jan 6, 2014 at 13:56

13 votes

Accepted

What is the definition of DX?

procedure dx etiquette

answered Jan 22, 2014 at 22:35

13 votes

Accepted

Is there an optimum Antenna Feedline Length for mobile installations?

mobile feed-line coaxial-cable vhf 2m-band

answered Mar 23, 2014 at 18:36

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931 Answers

Effect of different metals for antenna elements

Using a balun with a resonant dipole

FCC sends "Notice of Dismissal" with quite threatening language just for denial of a vanity callsign?

Which HF bands are best during the day and which are better at night?

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

Is it illegal to key up and not identify?

Is free space path loss dependent on frequency?

What is the effect of using different number of radials with ground plane antenna

What is a Gamma match in the context of the driven element of a Yagi antenna?

How can I protect equipment against a lightning strike?

Why do repeaters use cavity filters?

Is there a simple, DIY, antenna suitable for HF receive only?

Can I reduce RFI/noise at the antenna?

SDR sampling bandwidth - do the bits per sample matter?

Using a balun with a resonant dipole

Are antennas circuits?

How to detect common-mode currents or “RF in the shack”?

What is a linear RF amplifier?

What does a noise blanker really do, and what are the side effects?

If two antennas of 50 Ω and 377 Ω have VSWR=1:1, then which one is more efficient?

How do I separate dovetailed PowerPole housings?

How can I calculate the effects of an LNA, antenna gain, etc. on noise performance?

How Could Superheterodyne Receiver Ever Work?

How to reduce RF in the shack when using vertical HF antenna (no radials)

What is the relationship between SWR and receive performance?

Why do we use decibels in radio?

How does moving a feedpoint off-center in a dipole affect the resonant frequency and resistive load?

SDR: Quadrature demodulation vs direct RF sampling

What is the definition of DX?

Is there an optimum Antenna Feedline Length for mobile installations?