Topband: Inverted L
ad4hk2004 at yahoo.com
Mon Dec 19 17:45:41 EST 2005
1. Yes, in general... However the 3/8 moves the current lobe up the wire... So, lessened ground heating may offset the change in the main angle of radiation... Try it at a quarter wave until you have a feel for the antenna then try the 3/8.... It's only minimal work to make the change if you have the supports for the end...
2. Radials are a fluid subject... The best would be 120 @ 1 wave... You are unlikely to want to do this... If you are going to have fewer radials then shorter is
Without knowing your level of energy or committment, I would suggest getting in 30 radials approximately 1/4 wavelength, than add more as you see fit... Anything more than 50 radials is gilding the lily for a small percentage of improvement, i.e. to improve on 30 you will need at least 50... To improve on 50 you need 100+, etc... If you can get near a 100 radials then longer is better...
3. On the ground is fine.. Elevated is just an obstacle course... Under the ground is great, if you are into hard work, self flagellation, etc... One can use a power
lawn edger to cut the slits in the ground but it is still work to install the wire...
4. Leave the fence alone.. Don't tie the ends of the radials into it... Don't tie the ends of the radials to anything... Like sleeping dogs, let them be...
5. Inverted-L is not better than the Tee for DX work... The Tee is the best for low
angle radiation... I don't know that you can conveniently support both ends of a
Tee, but if so then it is recommended... An Inverted-L has some high angle
radiation that is nice for local contacts... The Tee will have a lower impedence
than the L at the feedpoint, so matching becomes an issue...
My advice is to avoid making this hard work... Put up the Tee or the L, run some radials and operate... When you feel like it run some more radials and operate... Etc...
cheers ... denny - k8do
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