Home |
Search |
Today's Posts |
#4
![]() |
|||
|
|||
![]() "John Smith" wrote in message ... Idea 1, would probably not work much at 446 as current would have a hard time to flow into attached insulated wire. general problem with most mobile antennas is getting enough RF current to flow out into them. There are two ways that Idea 1 can be thought of: A. The extra wire is a half wave dipole coupled to the 2 meter quarter wave. By some magic, it resonates and radiates on 446 MHz as a half wave dipole. B. A shorted quarter wave transmission line is an open circuit. So is a half wave open circuit transmission line. The extra wire next to the 2 meter quarter wave acts like an open half wave transmission line, effectively isolating the upper part of the 2 meter quarter wave when operating on 446. When the wire is positioned properly, the bottom part of the 2 meter quarter wave will act like a 446 quarter wave. Jim N8EE to email directly, send to my call sign at arrl dot net |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
Help! Apartment Antenna Question! | Antenna | |||
Mobile Ant L match ? | Antenna | |||
Poor quality low + High TV channels? How much dB in Preamp? | Antenna | |||
Mobile Antenna Question | Antenna |