user avatar
user avatar
user avatar
on4aa
  • Member for 8 years, 7 months
  • Last seen more than a week ago
50 votes
5 answers
7k views

How do I report an emergency using ham radio?

  • 1,704
39 votes
6 answers
65k views

Why do hams often conclude messages with "73"?

  • 2,589
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?

  • 351
30 votes
6 answers
36k views

Can I reduce RFI/noise at the antenna?

27 votes
4 answers
5k views

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

  • 4,790
25 votes
1 answer
6k views

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

  • 793
22 votes
2 answers
17k views

What makes a 5/8 wavelength vertical desirable?

21 votes
1 answer
653 views

What information should be on a QSL card?

  • 4,790
19 votes
3 answers
6k views

SDR sampling bandwidth - do the bits per sample matter?

  • 11.9k
19 votes
5 answers
63k views

Good wire for wire antenna?

  • 2,266
19 votes
1 answer
4k views

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

  • 1,194
18 votes
5 answers
15k views

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

17 votes
2 answers
4k views

Ham radio above 275 GHz

  • 7,402
17 votes
8 answers
35k views

Should I chose a vertical or a horizontal HF antenna?

  • 2,266
16 votes
2 answers
1k views

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

  • 1,704
15 votes
2 answers
6k views

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

  • 2,266
14 votes
3 answers
707 views

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

14 votes
4 answers
2k views

How can RF exposure hurt you?

  • 281
13 votes
2 answers
10k views

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

  • 1,194
13 votes
3 answers
5k views

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

12 votes
4 answers
1k views

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

12 votes
1 answer
6k views

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

  • 4,790
12 votes
3 answers
11k views

Protect rig from static charge on antenna

11 votes
6 answers
41k views

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

11 votes
4 answers
404 views

How do I increase my phone intelligibility?

  • 11.9k
11 votes
4 answers
1k views

What is the advantage of making an antenna resonant?

  • 1,022
11 votes
2 answers
3k views

How to do APRS in real wilderness?

  • 275
10 votes
5 answers
242 views

I can copy 15wpm how to to continue?

  • 211
10 votes
4 answers
4k views

Single or Dual Paddle Key?

  • 151
10 votes
2 answers
2k views

APRS digi path for ISS digipeater?

  • 103