Quote:
Originally Posted by Brian Reay[_5_]
Does anyone have any novel ideas for RF grounds to use with an
RV/Mobilehome.
The antenna is vertical whip most times, about 7m. It is a modified fishing
pole with a wire up the centre and a 1m detachable whip. A 4mm ' banana'
plug is the feed point for a flying lead to the Auto -tuner, -----
The setup is only used when parked up.
I'm looking for 'out of the box' ideas, I can fit in a camping 'pitch' and
setup /tear down quickly.
Brian
G8OSN/W8OSN
www.g8osn.net |
Brian,
Here is an idea to try... an off-center-feed L-dipole. It works this way: calculate the resonant length for the frequency of interest plus 3%; make your vertical arm 2/3 long. Make a second arm 1/3 long and mount it 15 to 30 degrees above horizontal Connect inner coax to the long vertical arm. Connect braid to the shorter arm then adjust its length and angle to lowest SWR. A telescoping antenna is useful at this point. You will find that there is one point where the impedance is exactly 50 ohms.
This antenna is directional. There will be gain towards the side arm direction and stronger gain horizontally from the side arm. Signals on the back side will be weak. Take some care which way you set up. Get the arms as high off the ground as possible to get lower angle of radiation and less power adsorbed by the ground and the hot side arm out of reach when transmitting.
Dick, KK4OBI