18 feet of coax is NOT needed

Good is a relative term. What is it being compared to?

 

Look at: Dipole Length | Antenna Length Calculation & Formula | Tutorial

leon
kc0iv

 

For a half wave dipole the length for a wave travelling in free space is calculated and this is multiplied by a factor "A". Typically it is between 0.96 and 0.98 and is mainly dependent upon the ratio of the length of the antenna to the thickness of the wire or tube used as the element.

This is why I like to start with the free space measurement. I kinda like the 4% leeway.

 

It all depends what frequency is being discussed. And what bandwidth the antenna is designed for.

leon
kc0iv

 

Excellent info here.

 

Oh lord here we go again with the DIPOLE CRAP give it a rest.

 

Ok

Ok ya can think what ya want on the crapcadia I'm driving the difference between 9ft. And 18ft. Is substantial.... The 18ft. Is the much better option

 

Where do you PUT all that wasted coax? Wonder what the "coax length" folks would do if faced with "450 ohm ladder line"? Hyuck. hyuck. hyuck! j/k

GF

 

Across the top of the air breather its all plastic--'--Threw the firewall hole up into the trk. Then into a frickin huge ### 400watt radio that's sitting on top of the DASH !!!! NOW GET YOU SOME OF THAT........

 

RG213 LMR240 OR LMR400 IS NOT WASTED COAX ANY WAY YA LOOK AT IT THEIR CHUCKLES.IF YA CANT RUN WITH THE BIG DOGS STAY ON THE PORCH....