[SixClub] Verticals

[Kenyon Lenart]

Thanks for the info  folks!I didnt think it would work....Matches up 
pertty good in the tuner but then you KNOw where the loss is.....I was 
just wondering if it would work or not...

Kenyon

Christopher Boone wrote:

> Folks,
> forget trying to reuse 11 mtr antennas.....Kenyon, if it does not have 
> radials, it is likely a 1/2wave antenna.....thus it has a matching 
> network at the bottom to match the HI impedance of the antenna 
> (2000ohms) to the 50ohm feedline....this cannot work on 6 without 
> redesign...cutting the whip does not work here..
>
> THE ONLY 11m ANTENNA THAT CAN BE CUT and SHORTENED for use on 6 is the 
> simple 108inch long 1/4wave ground plane with NO matching elements at 
> the feedpoint. Thus cutting the element moves the resonant freq...the 
> match for a 1/4wave is 1.2 or so to 1 (a 1/4wave vertical is 36 
> ohms..if you cut the element for min SWR, you are NOT 1/4wavelength 
> long and your take off angle of radiation may be WORSE....don't worry 
> about a little SWR...and it aint the true indicator of antenna resonance)
>
> Before cutting those exotic CB antennas which won't work on 6, go buy 
> a 4ft piece of tubing, mount it to an insulator (wood, etc), attach 3 
> to four ground radials (whips, wire, what have you) at a common point, 
> feed the vertical from the center of your coax and attach the shield 
> to the ground radials...
> and there is a simple cost effective 1/4wave gnd plane for 6 FM...
>
> Chris
> WB5ITT
>
> Kenyon Lenart wrote:
>
>> Ive got a 2 section 11meter vertical.No Radials. How much do I cut 
>> off the top section for 6 meter FM? Can I just use the DiPole formula?
>>
>> Kenyon
>
>