Home |
Search |
Today's Posts |
#11
![]() |
|||
|
|||
![]()
So your math is good only for an ideal antenna? That's a sad state of
affairs. Ok, let's suppose I build an ideal antenna that's about 33 feet high, with a feedpoint impedance of 35 - j370 ohms at 3.8 MHz. Choose an inductor value and let me know what the output:input current ratio would be for that inductor at the base of the antenna. Assume that the inductor is physically very small. You have such a clear understanding of what's happening, it should be a simple calculation. Then I'll do my best to build the antenna and make the measurement. Or you can. Roy Lewallen, W7EL Cecil Moore wrote: Roy Lewallen wrote: So what's your new, more precise prediction of the output:input current ratio (magnitude and phase) for the system I did measure? I don't see any way to make a precise prediction given that the antenna doesn't exhibit the expected characteristics of a 33' vertical on 75m. I don't see that your experiment makes a lot of difference now that you have said that a 75m bugcatcher coil causes a current magnitude change and a phase shift. That was the original argument. -- 73, Cecil, W5DXP |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
Smith Chart Quiz | Antenna | |||
QST Article: An Easy to Build, Dual-Band Collinear Antenna | Antenna | |||
Eznec modeling loading coils? | Antenna |