On 23 Feb, 11:26, Dave wrote:
Keep it flexible. Flexible elements have less wind resistance.



Lex-Lutor wrote:
What will be the best material for log-periodic antenna design, my idea is
to build LP-ant. for 14-30 MHz but it must stay alive at wind over 120 mPh.
Wellding and machine work is not problem bigest problem is to select good
Aluminium?

Maybe AA6082 or AA6061 something elese ?

Thanks for any help or info ?- Hide quoted text -

- Show quoted text -

Thinking over this problem again the biggest problem or enemy is boom
length and number of elements for this huge frequency spread.
I think I would take the time and try to make it a half length boom
with each element being used for two frequency spans by using a 24
volt internal solenoids to determine the desired lengths.As stated
earlier the solenoids are very light and interconnecting wiring need
only be .010 coated magnet wire. Boom material can now be made lighter
since less torque is involved.
When using the shorter element length the diconnected portions will
have an effect on the active length so care would have to be taken
here. 1/4 dia syringes used by diabetics is ideal with about 50 to 80
feet of .01 magnet wire to give a sufficient number of turns. I would
imagine just one on /off switch would be required depending at what
end of the frequency is in use.
Ofcourse you could double up to two set in Vee shape to get extra
oomph to overcome the LPs low gain values and it will still be less
torque than a full sized array.Food for thought!
Art