Hottest Questions Today

5 votes

3 answers

2k views

Can i use speaker wire as a transmission line?

transmission-line

CommunityBot

1

modified 15 hours ago

0 votes

3 answers

51 views

Linux Alternative Time Sync-ing for JS8 or FT8

ft8 js8

mike65535

1,023

modified yesterday

5 votes

2 answers

60 views

14dB insertion loss for bandpass filter acceptable?

diy

Hans Fong

51

answered 2 days ago

1 vote

0 answers

43 views

Is this amount of loss normal with LMR400?

antenna coaxial-cable feed-line nanovna

User5754448

301

asked 2 days ago

1 vote

2 answers

173 views

Why do ham radio operators refer to current flow on the outside of coax as common mode current?

antenna transmission-line

user10489

4,203

modified May 21 at 23:07

1 vote

2 answers

69 views

Baofeng Orange Transmit light comes on by itself (triggered by sound)

baofeng uv-5r

natevw - AF7TB

5,995

modified May 19 at 20:37

0 votes

0 answers

80 views

How can i make an ULF spiral antenna for agriculture [closed]

antenna

GodJihyo

254

modified May 20 at 14:54

2 votes

4 answers

103 views

Is an off-center fed dipole (and/or doublet) inherently unbalanced?

antenna-theory wire-antenna balun

natevw - AF7TB

5,995

modified May 19 at 0:41

2 votes

1 answer

328 views

Help on identifying signal type and extract audio from a signal

signal-identification audio

hobbs - KC2G

8,833

answered May 16 at 1:03

2 votes

2 answers

91 views

How do I rewire a simple a.m. loop antenna that became unwound?

antenna antenna-construction loop-antenna

glen_geek

536

modified May 17 at 16:14

10 votes

3 answers

2k views

Would it be possible for a software-defined FM receiver to demodulate two signals on the same frequency?

software-defined-radio receiver fm

hotpaw2

12.4k

modified May 8 at 16:48

0 votes

3 answers

85 views

ELF antenna receiver build instructions?

antenna antenna-theory antenna-construction

hobbs - KC2G

8,833

modified May 15 at 21:18

9 votes

2 answers

2k views

Why are longer antennas not suitable to pick higher frequencies?

antenna antenna-theory long-wire

John VE3WNA

1,212

modified May 6 at 16:24

1 vote

2 answers

76 views

How to best ditch the counterpoise of a random wire antenna?

wire-antenna antenna-system grounding

Andrew

3,403

answered May 17 at 0:00

2 votes

3 answers

50 views

Is a UHF connector any real disadvantage off the transmitter circuit board or at an antenna feedpoint?

coaxial-cable impedance-matching theory connectors pl259-so239-connector

user10489

4,203

answered May 15 at 4:27

2 votes

3 answers

81 views

Why does an HF "monopole" need dozens and dozens of radials while a VHF/UHF "ground plane" antenna only needs four?

antenna-theory vertical-antenna radial

User5754448

301

modified May 15 at 15:23

4 votes

3 answers

182 views

What is the difference between antenna input impedance and its radiation resistance?

rf-power impedance-matching impedance radiation

Andrew

3,403

modified May 8 at 22:52

2 votes

1 answer

84 views

Core mix preferences for a balun (or unun) vs a choke

ferrite

t252

585

modified May 10 at 13:13

2 votes

1 answer

42 views

How can a low-impedance load can damage a FET final amplifier?

electronics impedance amplifier

Kevin Reid AG6YO♦

22.9k

answered May 11 at 0:02

0 votes

0 answers

28 views

HAMRS logging app dumped all data

logging

jeremy johnson

1

modified May 14 at 22:14

-2 votes

3 answers

82 views

Radio without antenna?

antenna

webmarc

2,822

answered May 9 at 19:36

1 vote

2 answers

105 views

Is a 94' dipole antenna fed directly by coax useful for any particular known purpose?

antenna-construction wire-antenna equipment-design

Andrew

3,403

modified May 16 at 1:41

3 votes

2 answers

102 views

Can someone without privileges on a band operate FT8 on it using the callsign of a ham who does and is present?

united-states legal digital-modes fcc ft8

hobbs - KC2G

8,833

answered May 6 at 16:20

0 votes

1 answer

56 views

YouLoop antenna for amateur satellite reception

antenna vhf uhf satellites

tomnexus

7,817

answered May 11 at 23:54

-1 votes

1 answer

59 views

Transmission power of Apple Wi-Fi antennas (EMF and health)

antenna wifi safety

Mike Waters♦

7,495

modified May 7 at 22:33

1 vote

1 answer

40 views

How do I wire an external mic and speaker to the Yaesu FT-250R without using their adapter?

diy ht yaesu

byl

71

answered May 11 at 16:04

0 votes

0 answers

43 views

Direct call via the repeaters

repeater dmr brandmeister

Mike Waters♦

7,495

modified May 11 at 18:31

4 votes

2 answers

298 views

VNA basics, antenna coax cable

antenna coaxial-cable grounding testing vna

Mike Waters♦

7,495

modified Apr 29 at 21:27

1 vote

1 answer

234 views

Why is there a repeater on 146.46? Isn't that a simplex frequency?

united-states legal frequency repeater

Dax

145

modified Apr 27 at 19:23

0 votes

1 answer

58 views

What power levels do the Baofeng UV-5R/5RA/5RE have? [closed]

rf-power baofeng uv-5r power

John VE3WNA

1,212

modified May 5 at 12:09

2 votes

2 answers

144 views

Why do Baofeng radios have such poor reception reliability?

receiver baofeng equipment-design

hotpaw2

12.4k

answered Apr 28 at 1:42

0 votes

1 answer

32 views

Vertex Standard VZ-28 - Unable to import settings into software due to password

software radio-programming motorola

CommunityBot

1

modified May 18 at 16:05

5 votes

3 answers

149 views

What kind of soldering iron is best for PL-259 (UHF) connectors?

antenna-construction uhf coaxial-cable

Deepstop

121

answered Apr 30 at 19:14

0 votes

0 answers

36 views

How to get channel displayed on an Anytone 868UVE

anytone

CommunityBot

1

modified May 3 at 22:43

0 votes

1 answer

45 views

Sine wave 'frequency' in recorded signals

software-defined-radio frequency

John VE3WNA

1,212

modified Apr 30 at 18:31

1 vote

0 answers

49 views

Does a filter or inductor's power rating matter in its passband, or only in the attenuated frequency range?

rf-power electronics filter

natevw - AF7TB

5,995

asked Apr 27 at 3:27

1 vote

1 answer

35 views

Motorola XT460 CPS cable pinout

motorola

CommunityBot

1

modified May 19 at 2:04

0 votes

1 answer

75 views

Dual driven-element Yagi-Uda antennas

yagi

t252

585

modified Apr 29 at 13:11

1 vote

3 answers

63 views

Can ferrite rod antenna be made out of the choke?

antenna-construction ferrite

mike65535

1,023

modified May 4 at 18:25

3 votes

4 answers

118 views

Issues with high SWR on HF Kits EFHW 49:1 UnUn kit

antenna antenna-construction wire-antenna balun efhw

Deepstop

121

answered Apr 30 at 19:58

0 votes

1 answer

50 views

Is it possible to use LimeSDR/HackRF with DireWolf?

software-defined-radio direwolf

CommunityBot

1

modified May 2 at 4:06

2 votes

1 answer

142 views

How does injecting a carrier allow a FM receiver to demodulate SSB?

fm ssb

CommunityBot

1

modified Apr 30 at 23:02

0 votes

2 answers

96 views

Can fanned/parallel endfed antennas be used to get higher gain in some directions?

antenna-theory wire-antenna radiation-pattern end-fed-antenna efhw

CommunityBot

1

modified May 2 at 22:04

0 votes

2 answers

280 views

How to run chirp with python3-based system (workaround found now)

linux chirp

Guy Schlosser

1

modified 2 days ago

0 votes

3 answers

157 views

Can I use a car antenna intended for 2m/70cm on a 868mhz Lora device?

antenna

Jon

1

answered May 3 at 16:39

3 votes

1 answer

190 views

How does the material of a fishing-pole mast affect antenna performance?

antenna-construction wire-antenna dipole vertical-antenna

CommunityBot

1

modified 2 days ago

5 votes

1 answer

210 views

EFHW: better to get far end really high, or middle somewhat high?

antenna efhw

CommunityBot

1

modified May 5 at 22:06

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