Questions tagged [antenna]
Questions about the design, selection, building, testing, mounting, or properties of antennas. See also specific tags: [antenna-theory], [antenna-construction], [dipole], etc.
7
questions with no upvoted or accepted answers
4
votes
0answers
63 views
Dipole loading coil winding directions?
A single inductive loading coil in a vertical or a pair of loading coils in a dipole are commonly used to match a given total antenna length parameter to a given frequency wavelength (where the ratio ...
3
votes
0answers
36 views
How to simulate two antennas in 4nec2
I need to simulate 2 helix antennae placed side by side, and see the resultant radiation pattern. But after adding the second antenna with a separate and when I try to simulate 4nec2, only simulated ...
2
votes
2answers
92 views
Can I build a Yagi antenna for my Baofeng UV-5R?
I would like to build a Yagi antenna for my Baofeng UV-5R, but I'm a total newbie when it comes to amateur radios. The antenna will be for UHF and shouldn't be too long (like 1.5 meters max).
So my ...
1
vote
0answers
61 views
How do I Construct a Simple FM Antenna?
I recently bought a cheap stereo amplifier with built in FM receiver from Amazon at the first link below. Testing it out today I found the FM reception to be sub-par. All of my local stations that I ...
1
vote
0answers
239 views
What will be antenna impedance of a dipole antenna when it is kept lambda/2 away from the transmitter
I understand that half-wave dipole antenna, which is in far-field, impedance is around 73 ohms. If I keep same antenna in near-fied at distnace lambda/2 from the 1.25 lambda length tranmiter?
0
votes
0answers
25 views
ISOTRON 80m 75m Antenna Position
I know, a dipole is the way to go, but cannot fit one, only a
'birdhouse' antenna like the 75m 80m Isotron antenna.
Is it better to put at 15 feet Above Ground Level outside, or 20 feet AGL ...
-1
votes
1answer
62 views
How would I calculate aperture efficiency for an antenna?
How to calculate aperture efficiency for an antenna with the following parameters:
Big reflector diameter= 24 mm
Gain= 9.265 dbi
Frequency= 11.60 GHz
