Hottest Questions Today

1

vote

1

answer

34

views

What is a "feed-through load" and how does it work?

modified yesterday natevw - AF7TB 5,631

1

vote

2

answers

24

views

How should I think about "extra" impedances inserted within/across a transmission line?

coaxial-cable transmission-line theory

answered yesterday tomnexus 6,673

0

votes

1

answer

13

views

Direwolf APRS decoding unknown data

aprs direwolf

answered 4 hours ago hobbs - KC2G 7,529

2

votes

3

answers

44

views

Ferrite unun transformer to match antenna resistance loads of <50Ω?

impedance-matching vertical-antenna balun mf lf

modified 2 days ago tomnexus 6,673

0

votes

1

answer

40

views

How to communicate with about 1 km range? [closed]

antenna radio-control long-path telecommand

modified 2 days ago user10489 3,447

2

votes

1

answer

48

views

Reasons for an antenna tuner at the transmitter other than transmitter protection?

impedance-matching transmitter antenna-tuner

answered Dec 1 at 21:15 hobbs - KC2G 7,529

1

vote

0

answers

20

views

Maxtrac 300 speaker

equipment speaker

modified 2 days ago Mike Waters♦ 7,383

0

votes

1

answer

55

views

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

antenna

answered 2 days ago pperrin 101

1

vote

0

answers

47

views

Coupling Capacitor of an Antenna

antenna antenna-theory filter bandwidth

modified Nov 28 at 19:43 katalaveino 111

1

vote

0

answers

36

views

Why does transformer in mcHF kit use coax?

transformer

modified Nov 29 at 0:15 tomnexus 6,673

5

votes

1

answer

65

views

Simple circuit for acceptably clean CW in homebrew TX?

diy cw equipment-design

modified Nov 26 at 19:57 Mike Waters♦ 7,383

7

votes

1

answer

135

views

How long should I wait to claim a frequency?

procedure

modified Nov 24 at 16:50 rclocher3♦ 8,383

4

votes

0

answers

62

views

Purpose and sizing of capacitors placed across RF push-pull power amplifier transformer windings

equipment-design amplifier transformer power

modified Nov 26 at 20:08 Mike Waters♦ 7,383

1

vote

2

answers

39

views

How do you calculate the impedance of a parallel-wire balanced feedline (ladder line)?

impedance-matching impedance feed-line

modified Nov 25 at 7:48 hobbs - KC2G 7,529

0

votes

0

answers

46

views

Can you identify the modulation of this signal?

modes signal-identification

asked Nov 25 at 15:32 jackson.c 1

2

votes

2

answers

175

views

How bad is it to make dipole elements slightly helical?

antenna-construction wire-antenna dipole 10m-band

answered Nov 26 at 7:55 Richard Fry 2,807

5

votes

1

answer

233

views

bizzare CW on 2m

cw 2m-band signal-identification

modified 12 hours ago Aaron 51

2

votes

1

answer

81

views

High electrical noise only when coax shield is connected

antenna coaxial-cable noise

modified Nov 21 at 13:17 user10489 3,447

4

votes

5

answers

102

views

Antenna tuner at the transceiver output confusion

antenna-theory impedance-matching impedance antenna-tuner resonance

modified Nov 19 at 22:27 hotpaw2 10.9k

0

votes

0

answers

77

views

Which is the most efficient FM digital mode (for data and text)?

digital-modes

modified Nov 22 at 9:35 Gigi 1

2

votes

1

answer

43

views

Second filter is not working on my mcHF kit

filter

modified Nov 21 at 14:06 F. Sessink 1,103

6

votes

2

answers

272

views

Extra class first?

license callsign

modified Nov 10 at 1:45 hobbs - KC2G 7,529

7

votes

1

answer

76

views

Are there any active ham satellites orbiting that use the 5cm band?

antenna satellites

modified Nov 15 at 11:21 Marcus Müller 12.8k

1

vote

3

answers

115

views

radials for 6 band Hustler vertical

antenna-theory vertical-antenna radial

modified Nov 23 at 15:19 rclocher3♦ 8,383

0

votes

0

answers

29

views

Parameters for gnuradio block "PDU Filter"

gnuradio

modified Nov 21 at 18:04 Michael Dreher 101

5

votes

3

answers

262

views

Transmitting Morse Code as Tone vs. Carrier

cw morse-code

answered Nov 10 at 14:19 Zeiss Ikon 3,670

9

votes

3

answers

178

views

Will there be common-mode currents if a coax followed by a ladder line is terminated in a dummy load?

transmission-line dummy-load

modified Nov 9 at 13:41 rubund 224

3

votes

1

answer

54

views

Phasing stub length for colinear 5/8λ?

antenna antenna-theory antenna-construction vertical-antenna j-pole

answered Nov 24 at 4:12 hobbs - KC2G 7,529

2

votes

1

answer

35

views

Automatic identification system (AIS) on aprs.fi - Long Rx -> Tx distances

digital-modes vhf packet ais

modified Nov 15 at 13:12 Marcus Müller 12.8k

1

vote

2

answers

70

views

Antenna Size limits at 2-30 MHz (10 m to 150 m wavelength)

antenna antenna-construction

modified Nov 13 at 17:49 rclocher3♦ 8,383

3

votes

1

answer

99

views

How to correctly model a small helix antenna

antenna-modeling

answered Nov 8 at 18:16 tomnexus 6,673

4

votes

1

answer

59

views

Can a regen receiver be used as a CW transceiver?

transceiver vacuum-tubes

modified Nov 12 at 17:06 Zeiss Ikon 3,670

3

votes

2

answers

72

views

How to apply for the ARRL WAC award?

dx lotw wac

modified Nov 27 at 3:11 QuantumMechanic 781

0

votes

1

answer

45

views

Why so high values of noise température of a spectrum analyser?

noise spectrum-analyzer

answered Nov 11 at 5:22 tomnexus 6,673

2

votes

1

answer

56

views

Programming receive tone on Kenwood V71A

kenwood radio-programming tone-squelch kenwood-tm-v71a

answered Nov 12 at 20:25 user3486184 1,567

0

votes

1

answer

50

views

Frequency division multiplexing FM Radio stations

receiver fm transmission

answered Nov 9 at 19:04 webmarc 2,275

2

votes

0

answers

66

views

Did I brick my Yaesu ft-780r

yaesu equipment-troubleshooting

modified Nov 8 at 14:56 tc0nn 1

0

votes

1

answer

14

views

Yaesu FT-270 doesn't remember tone ctcss

yaesu

answered Nov 12 at 3:01 rogerdpack 121

1

vote

0

answers

34

views

Crystal Filter Impedance Matching

impedance-matching filter

asked Nov 10 at 5:03 Thomas L 151

-3

votes

0

answers

42

views

`OOOOOOOOOOOOOOOO` error when running gnuradio

gnuradio usrp

asked Nov 8 at 19:45 kittygirl 322

6

votes

2

answers

103

views

FT8 etiquette when no reply after responding to CQ?

ft8 etiquette

answered Nov 6 at 20:12 xmjx 203

1

vote

3

answers

97

views

What cause the shape of frequency spectrum convex or concave?

software-defined-radio gnuradio usrp fosphor gain

modified Nov 14 at 14:06 CommunityBot 1

0

votes

2

answers

155

views

Where can I find a service manual for the TECSUN PL-660 to replace the failed circuit board flex cable myself?

receiver equipment-troubleshooting repair tecsun

modified 11 hours ago CommunityBot 1

2

votes

1

answer

444

views

Implementing a BPSK and 4-FSK transmitters in GnuRadio (GRC) with USRP?

software-defined-radio gnuradio transmitter dsp

modified Nov 29 at 16:00 CommunityBot 1

0

votes

1

answer

198

views

Writing "Wav" file in GNU Radio 3.9.0

software-defined-radio gnuradio audio

answered 2 days ago Efthymia 11

1

vote

2

answers

175

views

FT-450D not transmitting with microphone

digital-modes transmitter equipment-troubleshooting microphone ft-450d

modified Nov 12 at 0:04 CommunityBot 1

1

vote

1

answer

2k

views

Baofeng UV-5R transmitting to Baofeng BF888s - 888s will not receive transmission unless holding "mon"

baofeng transmission

modified Nov 25 at 10:36 peter thurston 1

1

vote

5

answers

2k

views

Can I contact the International Space Station using my Baofeng UV5R?

vhf uv-5r transmission

modified Dec 1 at 18:25 Kourosh Delpak 15

questions	4,025
answers	7,691
answered	96%
users	16,032
visitors/day	1,832
more site stats on:	Area 51 Stack Exchange

Top Questions

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.