User on4aa

50 votes

5 answers

7k views

How do I report an emergency using ham radio?

berry120

1,704

asked Oct 22, 2013 at 20:29

39 votes

6 answers

65k views

Why do hams often conclude messages with "73"?

jargon

Amber

2,589

asked Oct 25, 2013 at 18:50

35 votes

14 answers

36k views

Can my neighbor's ham radio antenna be interfering with my internet signal or is my internet provider just throwing blame elsewhere?

rfi

Vanessa

351

asked Nov 27, 2016 at 20:00

30 votes

6 answers

36k views

Can I reduce RFI/noise at the antenna?

antenna hf rfi snr

The Driver

403

asked Nov 7, 2013 at 17:27

27 votes

4 answers

5k views

What is a link budget, and how do I make one?

jargon range path-loss

user

4,790

asked Oct 25, 2013 at 21:43

25 votes

1 answer

6k views

Is there a way to listen to live HF communications using the internet?

hf receiver internet

dcaswell

793

asked Oct 24, 2013 at 21:29

22 votes

2 answers

17k views

What makes a 5/8 wavelength vertical desirable?

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Phil Frost - W8II

49.8k

asked Dec 21, 2013 at 13:21

21 votes

1 answer

653 views

What information should be on a QSL card?

qsl-card

user

4,790

asked Dec 16, 2013 at 9:31

19 votes

3 answers

6k views

SDR sampling bandwidth - do the bits per sample matter?

software-defined-radio diy theory electronics

Adam Davis

11.9k

asked Nov 7, 2013 at 17:39

19 votes

5 answers

63k views

Good wire for wire antenna?

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Timtech

2,266

asked Oct 22, 2013 at 23:12

19 votes

1 answer

4k views

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

antenna impedance dipole antenna-theory

Bill - K5WL

1,194

asked Oct 22, 2013 at 21:15

18 votes

5 answers

15k views

Why do folded dipoles have greater bandwidth than ordinary resonant dipoles?

antenna dipole bandwidth folded-dipole antenna-theory

Phil Frost - W8II

49.8k

asked Nov 22, 2013 at 12:38

17 votes

2 answers

4k views

Ham radio above 275 GHz

ehf

Skyler 440

7,402

asked Nov 2, 2013 at 1:23

17 votes

8 answers

35k views

Should I chose a vertical or a horizontal HF antenna?

antenna vertical-antenna hf polarization

Timtech

2,266

asked Oct 22, 2013 at 23:18

16 votes

2 answers

1k views

Why is the solar-flux index measured at 10.7 cm?

sunspots space-weather

Dan

1,704

asked Oct 23, 2013 at 21:30

15 votes

2 answers

6k views

50 Ohm coaxial cable vs 450 Ohm or 600 Ohm ladder or window line?

feed-line coaxial-cable

Timtech

2,266

asked Oct 22, 2013 at 22:42

14 votes

3 answers

707 views

Is there a KML or similar file that shows all of the CQ Zones?

location cq-zones map

PearsonArtPhoto

5,953

asked Oct 22, 2013 at 19:31

14 votes

4 answers

2k views

How can RF exposure hurt you?

safety

spuder

281

asked Nov 6, 2013 at 16:18

13 votes

2 answers

10k views

When is RF grounding necessary, and when is it not?

grounding installation

Bill - K5WL

1,194

asked Oct 22, 2013 at 20:10

13 votes

3 answers

5k views

Is a vertical noisier than a dipole, and if so, why?

antenna snr noise

Phil Frost - W8II

49.8k

asked Nov 25, 2013 at 2:53

12 votes

4 answers

1k views

What is generally considered "too much" power for JT-65 on HF?

hf digital-modes jt65

krzysz00 KF5SOQ

541

asked Oct 29, 2013 at 22:05

12 votes

1 answer

6k views

What do the three-letter modulation codes (emission designators) stand for?

jargon

user

4,790

asked Oct 26, 2013 at 15:43

12 votes

3 answers

11k views

Protect rig from static charge on antenna

antenna-construction wire-antenna equipment-protection

Wayne Conrad KF7QGA

460

asked Oct 30, 2014 at 2:02

11 votes

6 answers

41k views

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

antenna antenna-theory dipole impedance-matching yagi

Ron J. KD2EQS

1,270

asked May 19, 2014 at 13:21

11 votes

4 answers

404 views

How do I increase my phone intelligibility?

contest ssb transmission phone audio

Adam Davis

11.9k

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11 votes

4 answers

1k views

What is the advantage of making an antenna resonant?

antenna-theory

Chris K8NVH

1,022

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11 votes

2 answers

3k views

How to do APRS in real wilderness?

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hamster

275

asked Sep 5, 2016 at 12:26

10 votes

5 answers

242 views

I can copy 15wpm how to to continue?

morse-code

cp03525

211

asked Feb 24, 2020 at 19:33

10 votes

4 answers

4k views

Single or Dual Paddle Key?

cw

jim2100

151

asked Oct 12, 2016 at 17:56

10 votes

2 answers

2k views

APRS digi path for ISS digipeater?

vhf satellites aprs

JW03

103

asked Jun 8, 2017 at 19:26

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How do I report an emergency using ham radio?

Why do hams often conclude messages with "73"?

Can my neighbor's ham radio antenna be interfering with my internet signal or is my internet provider just throwing blame elsewhere?

Can I reduce RFI/noise at the antenna?

What is a link budget, and how do I make one?

Is there a way to listen to live HF communications using the internet?

What makes a 5/8 wavelength vertical desirable?

What information should be on a QSL card?

SDR sampling bandwidth - do the bits per sample matter?

Good wire for wire antenna?

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

Why do folded dipoles have greater bandwidth than ordinary resonant dipoles?

Ham radio above 275 GHz

Should I chose a vertical or a horizontal HF antenna?

Why is the solar-flux index measured at 10.7 cm?

50 Ohm coaxial cable vs 450 Ohm or 600 Ohm ladder or window line?

Is there a KML or similar file that shows all of the CQ Zones?

How can RF exposure hurt you?

When is RF grounding necessary, and when is it not?

Is a vertical noisier than a dipole, and if so, why?

What is generally considered "too much" power for JT-65 on HF?

What do the three-letter modulation codes (emission designators) stand for?

Protect rig from static charge on antenna

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

How do I increase my phone intelligibility?

What is the advantage of making an antenna resonant?

How to do APRS in real wilderness?

I can copy 15wpm how to to continue?

Single or Dual Paddle Key?

APRS digi path for ISS digipeater?