Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Most Popular

more tags
1500 questions
10
votes
2 answers

Full UK license visiting US: Can I use frequencies in US but not UK license?

E.g.: 7.2-7.3MHz are Region 2 but not Region 1. My license is "from" Region 1. 1.25 meter band is not available in the UK Operating from aircraft is not permitted in the UK. Would it be if I visited the US? I realise that any frequencies not…
Thomas
  • 754
  • 5
  • 13
10
votes
2 answers

Why do we have to hand wind toroids?

Many, if not most, ham radio kits (transceivers, tuners, ununs, baluns) require the builder to hand wind and tap their own toroids. (example) This is a considerable area of stress for newbie builders and a failure point for their builds. I can’t…
RoboKaren
  • 864
  • 7
  • 16
10
votes
3 answers

My neighbor is complaining about my transmissions, what can I do?

My neighbor has indicated that they can hear noise from their computer amplified speakers when I'm transmitting. We've done a few tests and it does appear that it's my transmitter that's causing the noise. I've performed some testing and determined…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
10
votes
3 answers

Aside from repeaters, what station types allow automated transmissions?

I know repeaters don't have to have a control operator at the radio in order to transmit given certain conditions are met. Are there any restrictions to setting up automated stations which transmit upon receiving specific transmissions from their…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
10
votes
1 answer

How terminate RG8 coaxial cable using PL259 (UHF) - screw - gasket - solder type?

Today I came across a problem in terminating RG8 cable using this PL259 plug. I have never had this type and it arrived in a pile of parts; I have tried to puzzle it together but without positive effect. While googling i came only across crimping…
marc234
  • 101
  • 2
10
votes
3 answers

Ham Technician Exam Material

I would like to prepare for the Technician exam. I think I read somewhere that the ham Technician exam has material that is revised every 4 years. And that the new set of questions will be coming out later this year. Is this correct? Is this…
Ben914
  • 103
  • 3
9
votes
2 answers

How do I notify and publish information on experimental modes?

I'm considering tinkering with a new mode. Of course I'll stick to experimental channels and low power for now, but as people notice my transmissions they won't immediately understand what is being transmitted. How do I disseminate information that…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
9
votes
1 answer

What are these continuous sine wave tones I keep hearing?

I'm messing around on WebSDR and by just scanning through I sometimes come across these continuous tones in USB. One in particular was 28.800 MHz USB. I've picked them up on nearly every WebSDR unit I've used. This one in particular was the most…
user11031
9
votes
2 answers

SWR Measured at the Transmitter versus SWR at the Antenna

It is fairly well understood that due to transmission line losses, the SWR as measured at the transmitter will be less than the SWR at the antenna. Some of the new antenna analyzers and some vector network analyzers can 'zero out' or compensate for…
Glenn W9IQ
  • 18,688
  • 1
  • 25
  • 55
9
votes
3 answers

Attic Dipole - Impact of Ethernet over CAT5/6

I've been thinking about putting 20m and 10m dipoles up in my attic (HOA), but I also intend to soon put some Ethernet cable to a WAP (with PoE) through the attic. I was intending to feed this with CAT5e cable because I have lots of it and it's…
William
  • 813
  • 1
  • 8
  • 19
9
votes
1 answer

Which international regulation allows reception, archiving or republishing of amateur transmissions?

I remember from my amateur radio course, and old versions of our local national regulation documents, that anyone is allowed to receive amateur radio transmissions. It's been claimed that international radio regulations (ITU RR probably) defines…
oh7lzb
  • 2,411
  • 1
  • 18
  • 38
9
votes
6 answers

Aluminum vs copper antenna element lengths

Does the particular metal used in antenna elements make any difference in element length or spacing, i.e. 1/2" aluminum tube vs 1/2" copper tube? I know that length and diameter have an effect on resonance and impedance, but does the particular…
David Thorpe
  • 93
  • 1
  • 1
  • 6
9
votes
3 answers

What is the electrical shock risk of an antenna?

I've seen people refer to avoiding touching an antenna or bare transmission line that might be transmitting. What voltage potentials and currents are commonly found on typical ham radio antennas? Do both the voltage and current increase with…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
9
votes
1 answer

Is FM appropriate for foxhunting?

I'm thinking about an inexpensive way to create a foxhunt kit for youth groups, and am wondering if the cheap dual band HTs could be used. However, it occurs to me that FM doesn't provide any good audio queues for signal strength, and the SWR meters…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
9
votes
2 answers

Is any licensing require to receive in the amateur radio bands?

I'm considering hosting a foxhunt for a local youth group (scouts, in this case), and one of the questions asked was whether those searching for the hidden transmitter need have a license of any sort. Will they need licenses if they are handling…
Adam Davis
  • 12,295
  • 2
  • 51
  • 111
1 2 3
…
99 100