[600MRG] New Antenna near Tree + Rain

[Ed Cole]

Paul,

Interesting.  My "old" invert-L would shift with soil condition between 
summer and winter about 20-Hz.  I use a tapped HB base loading coil.

In Nov. 2020 the 50-foot support tower came down in extreme winds.  I 
decided to change to a style T.  I will use my 80m dipole and 40m dipole 
at top hat with wires run at 90-degrees to each other.  Center will be 
40-foot high so I can access using a man-lift that can reach that high. 
  Dipole ends will be about 30-foot high.

Feed will be two runs of RG-213 spaced a foot apart hung from 40-foot to 
ground where the loading coil will be mounted.  I will just use the 
shields of the coax as parallel open wire feed.

I will run radials across my lawn this summer (soon)(probably six). 
This is different than the radial system used on the invert-L so I 
expect tuning to be different.  Hope to have this up by October.

73, Ed - KL7UW
http://www.kl7uw.com/630m.htm

On 6/1/2022 4:15 AM, Paul Signorelli wrote:
> New Antenna + Rain...
>      i just moved the radiating vertical of my antenna nearer to my tree 
> support.
> The rain today raised the resonant frequency from 473 to 510 kHz.
> The Q still looks the same at 510 kHz as it was at 473 kHz.
> What happened?
> My antenna tuning coil is outside but shielded from rain (i think).
> My old antenna had a 10 x 10 foot top hat and the vertical wire was out 
> in the open away from the tree. Maybe i should go from a "L" (Configured 
> like the letter Resh in Hebrew) antenna to a "T" antenna.
>     i don't want to retune the antenna for 'rain' because rain happens 
> very infrequently.
> Paul   w0rw
> 
> ______________________________________________________________
> 600MRG mailing list
> Home: http://mailman.qth.net/mailman/listinfo/600mrg
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:600MRG at mailman.qth.net
> 
> This list hosted by: https://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html