Most Popular
1500 questions
5
votes
1 answer
How do I put an RJ-45 connector on to repair a Kenwood MC-59 microphone cable?
I've got a Kenwood MC-59 microphone, which started fraying around the place where the mic cable goes into the body. I thought I'd cut it off and put a new RJ-45 jack on it.
After cutting the cable, I discovered something completely unexpected.…
user3486184
- 2,278
- 16
- 29
5
votes
2 answers
How to estimate ladder line loss?
There have been a number of questions regarding the issue of feed line loss and ladder line eventually gets discussed. So I am curious, how does one begin to estimate the loss in ladder line?
So, for the case of 2 bare wires "somehow" spaced an…
Chris K8NVH
- 1,062
- 1
- 10
- 24
5
votes
1 answer
How do I determine antenna spacing?
How do I determine antenna spacing so that I don't end up overdriving the front end of a receiver when transmitting?
Timtech
- 2,376
- 2
- 26
- 40
5
votes
5 answers
Why are some electrical connectors silver plated?
Silver is pretty expensive. Unlike gold, it will tarnish in air. Why then would anyone bother to plate connectors with it? Does it have some unique electrical characteristics that make it useful?
Phil Frost - W8II
- 52,635
- 8
- 91
- 225
5
votes
8 answers
Why are some electrical contacts gold plated?
Gold is really expensive. Why then would anyone bother to plate connectors with it? Does it have some unique electrical characteristics that make it useful?
Phil Frost - W8II
- 52,635
- 8
- 91
- 225
5
votes
2 answers
Abilities to limit antenna use?
What kinds of abilities does a Home Owners' Association (HOA) in the United States have to limit the use of antennas placed on a roof to an owner of a home in the area?
Timtech
- 2,376
- 2
- 26
- 40
5
votes
2 answers
How to construct a loop antenna for receiving HF?
I have a unused hula-hoop in my garage, and I ran some stranded speaker wire around it once, and attached one side of the wire to the coax shielding, and the other to the coax core wire. Is this the correct way to construct a loop antenna for…
cj5
- 388
- 1
- 3
- 8
5
votes
1 answer
What radio regulations apply in International waters?
What regulations apply to radio operations in International waters? How far offshore does one need to be? Does the answer change between registered commercial vessels and home-made rafts or canoes?
hotpaw2
- 13,635
- 8
- 49
- 83
5
votes
2 answers
How far from earth do FCC regulations apply?
So, I know people in the space station need a HAM radio license for operation.
How Far exactly from earth do you have to be to transmit any RF wave you want without a license?
Skyler 440
- 7,690
- 9
- 54
- 90
5
votes
3 answers
What frequencies am I not allowed to use north of line A in the USA?
What frequencies can I not use if I live north of line A in the USA?
Timtech
- 2,376
- 2
- 26
- 40
5
votes
1 answer
How long can a transceiver be unused before I have to use a variac?
I have an old TenTec Argosy II that hasn’t been powered up for 20 years.
How long can electronics go unpowered before I have to worry about the electrolytic needed a slow power up with a Variac?
kd4ttc
- 153
- 5
5
votes
3 answers
How to measure wire for antenna leg | 40m inverted V
I am building the antenna for the first time and I have choosen to start with 40m inverted-v. I am almost done with the center insulator made of PVC piping elements, three eye hooks and SO 239 connector at the bottom.
Now I am getting ready to…
Bogdan YU2DBC
- 121
- 5
5
votes
5 answers
Loop antenna layout and radiation?
I've got, for the near term, limited resources to put up an HF antenna at my home. One of the options I can manage without excessive cost is a loop, which would enclose the house. I need to transmit on 80m, and likely up to 20m (I understand loops…
Zeiss Ikon
- 4,116
- 1
- 15
- 34
5
votes
2 answers
Can I have a signal generator on while it's not connected?
The unit in question is an Elecraft XG3 test signal generator. It puts out anywhere from -107 dBm to 0 dBm. Is it safe to have these signal generators on and transmitting while not connected to anything, or should they always be connected to a 50…
Paul
- 791
- 8
- 19
5
votes
2 answers
Why do receiver sensitivities vary so much with frequency?
I was looking for a 2.4 GHz WiFi antenna to catch a weak free WiFi signal, and amplify it so I can use it. I found Ruckus Metroflex NG, which can receive signals down to -108 dBm. Which is amazingly weak; however, while searching for such an…
Alex
- 183
- 5