Home |
Search |
Today's Posts |
|
#1
![]() |
|||
|
|||
![]()
Fat antennas have more bandwidth, and that is inversely
proportional to Q. Teducing antenna Q, by fattening the antenna, reduces the antenna potential by about the same factor. Best regards, Richard Harrison, KB5WZI =========================== Richard, If you got this off Terman and Kraus then Terman and Kraus are a couple of the oldest of old wives. --- Reg |
#2
![]() |
|||
|
|||
![]()
On Mon, 31 Jan 2005 16:55:03 +0000 (UTC), "Reg Edwards"
wrote: If you got this off Terman and Kraus then Terman and Kraus are a couple of the oldest of old wives. Reggie, This has got to be the height of your boredom to force your nemesis into the thread to then complain about them. Sounds unmistakably like the envy of a hausfrau. 73's Richard Clark, KB7QHC |
#3
![]() |
|||
|
|||
![]()
Reg, G4FGQ wrote:
"Richard, If you got this off Terman and Kraus then Terman and Kraus are a couple of the oldest of old wives." I can`t blame them because I wrote without consulting them first. Terman does in fact say about what I said. I haven`t checked with Kraus yet. In his 1955 edition on page 921 Terman writes: "The second possible way to achieve broad-band characteristics consists in starting with a resonant antenna (as opposed to a rhombic for example), but so proportioning this antenna as to minimize resonance effects. Thus a resonant antenna employing a thin wire is equivalent to a moderately high Q system and so has a relatively narrow frequency band. However, if the diameter of the antenna is made large, the effective Q is very substantially reduced with resulting increase in bandwidth." Best regards, Richard Haarrison, KB5WZI |
#4
![]() |
|||
|
|||
![]()
I also wrote:
"Fat antennas have more bandwidth, and that is inversely proportional to Q. Reducing antenna Q, by fattening the antenna, reduces the antenna potential by almost the same factor." Here is support from Ed Laport`s "Radio Antenna Engineering page 37": "It is seen that bandwidth is inversely proportional to antenna (or total circuit) Q. To decrease Q, the same design considerations are required as for the reduction of antenna potential." Best regards, Richard Harrison, KB5WZI |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
The "TRICK" to TV 'type' Coax Cable [Shielded] SWL Loop Antennas {RHF} | Antenna | |||
The "TRICK" to TV 'type' Coax Cable [Shielded] SWL Loop Antennas {RHF} | Shortwave | |||
Homebrew dipole help please? | Boatanchors | |||
40 meter dipole or 88 feet doublet | Antenna |