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5 votes
Accepted

generic antenna tuner term: impedance matching vs real tuner

Whether for an inductive antenna, like a loop, or a capacitive type antenna, an antenna tuner is correctly named, because it does tune an antenna, when used at the antenna feed-point. The problem is ...
Louis Seaman's user avatar
  • 1,097
5 votes

generic antenna tuner term: impedance matching vs real tuner

is the above correct ? Please explain. No. In both cases you're adding one or more reactive elements to the radiating element in order to get a better impedance match and improve power transfer to ...
hobbs - KC2G's user avatar
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4 votes

longest practical feed line length

There's no limit, really. Losses at HF aren't very high, and you're basically just trading cost for low-lossness. I'd go the other way around: Write down the maximum TX power you want to work at. ...
Marcus Müller's user avatar
3 votes

longest practical feed line length

What does "practical" mean to you? Depending on your definition of "practical" very long. Taking your chosen feed line's loss rating at face value according to this table (...
webmarc's user avatar
  • 4,241
3 votes

longest practical feed line length

You have to look at coax specifications and see what the loss is per foot/meter at the frequency range you intend it for, and see if that's acceptable. I run Belden 9913 to all of my antennas, and my ...
Louis Seaman's user avatar
  • 1,097
3 votes

generic antenna tuner term: impedance matching vs real tuner

The small loop is an extremely lossy antenna, so it doesn't work at all unless it is tuned, and the tuning device is usually in the middle of the antenna. A conventional "antenna tuner" is ...
user10489's user avatar
  • 6,485
3 votes

Monopole antenna with no ground connection

Usually the shield is connected to the magnet at the base of the antenna and is capacitively coupled to the metal to which the antenna is attached. Typically a steel pizza plate acting as a ground ...
Jean-Marie's user avatar
3 votes

Minmum spacing between two receive-only omidirectional antennas

If antennas are end to end, they can be very close, nearly touching without any problem. If the antennas are side by side, they will not interfere with each other for receiving, but one antenna may ...
user10489's user avatar
  • 6,485
3 votes

How do I ground my first HF rig?

Q1. My first question regards the transceiver. It has a ground terminal on the back, but its power cord is also grounded. Should I assume that the chassis is grounded through the cord's ground pin? A1....
Dereck's user avatar
  • 565
2 votes

How do I ground my first HF rig?

There are lots of grounding myths that just keep getting repeated over and over until people believe it. As a result, they either suffer lightning damage to their equipment or their radiated signal is ...
Mike Waters's user avatar
  • 8,071
2 votes

Radials with centre-loading coil

In short, yes, if it is a current-fed antenna, i.e. a quarter wave, or odd multiple thereof (3/4,5/4, etc.); if it is a λ/2 antenna, or even multiple thereof, then no, it does not need radials. ...
webmarc's user avatar
  • 4,241
2 votes
Accepted

Monopole antenna with no ground connection

What happens to the ground wire in this case (the outer part of the Coax output)? is the shield of the coax cable acting as the "ground"? Yes, and so is all other connected metal, possibly ...
Kevin Reid AG6YO's user avatar
  • 24.7k
1 vote

Minmum spacing between two receive-only omidirectional antennas

For receive only, no real problem. If you had transmitters, you could not separate them far enough horizontally. You would blow out the receiver's front end in the adjacent antenna without some ...
Dereck's user avatar
  • 565
1 vote
Accepted

Operation of an off-center fed vertical for 10 meters

I'll answer your question with the technicalities, and then I'll make some suggestions. First, in a 50 Ohm vertical 1/4 wave antenna, as you might know, your radiator and your radials are each going ...
Louis Seaman's user avatar
  • 1,097
1 vote

Impedance of linear loaded 1/4 wave element

An inverted L is a far, far superior solution to any sort of loaded monopole. The antenna is effectively full size, you get a whole quarter-wave of wire in the air, low and stable SWR across a ...
tomnexus's user avatar
  • 11.4k
1 vote

Monopole antenna with no ground connection

Dan, All simple antennas have two parts, think of the two arms of a dipole, or a rabbit ear tv antenna. The whip or monopole antenna has two parts also, the wire in the air, and the earth below it. ...
Jimbo47's user avatar
  • 86

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