You can use a variety of methods of electrically lengthening physically
short radials, from the coils Joe suggests to linear methods or just running
the full-size radials in the spaces available, zig-zagging or turning
corners, etc.
73, kelly
ve4xt
On 5/3/14 11:32 AM, "Joe" <nss@mwt.net> wrote:
> Ok,,
>
> What you can do since it is elevated, yes they ( The Radials ) do need
> to be resonant just like a dipole. And since you can not do full sized
> ones. You can just like a dipole add loading coils to them to be allowed
> to have them shorter and still be resonant.
>
> Remember being elevated you need them to be resonant for EVERY band of
> operation also, and at least 4 per band. Goona get complicated. I see
> LOTS of interactions between them all, trying to get all of them
> resonant on all those bands at the same time. WOW.
>
> Joe WB9SBD
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> On 5/3/2014 10:19 AM, Douglas Ruz wrote:
>> Hi,
>>
>> Let me give more information.
>>
>> I am trying to build the antenna published in Sep/1981 QST. It is 44
>> ft high plus a capacitance hat.
>> It is 5/8 on 30m, 1/2 on 40m, 1/4 on 80m and 1/8 on 160m (the vertical
>> portion).
>>
>> In my case, IT IS NOT on ground. My backyard is about 15 by 15 ft, so
>> i decide install the antenna in top of mast about 15 ft high, so,
>> radials are elevated and running over the roof but only till 60 ft, so
>> for 160m i need do "something" to get match.
>>
>> I think i must install independent radials for each band to get
>> resonance cause i am using elevated resonant radials.
>>
>> Dave, K3ZJ and Bob WP2XX now you have more information.
>>
>> Thanks in advance
>>
>> 73...Doug, CO8DM - Member of T48K Team
>> ----- Original Message ----- From: "David Siddall" <hhamwv@gmail.com>
>> To: "CQ-Contest" <cq-contest@contesting.com>; "Douglas Ruz"
>> <co8dm@frcuba.co.cu>
>> Sent: Saturday, May 03, 2014 11:01 AM
>> Subject: Re: [CQ-Contest] Verticals and radials????
>>
>>
>> If laid on or under ground, as many as possible and lengths don't
>> matter. If elevated, need to be resonant, but assume this is not your
>> case.
>>
>> For excellent info on radials, see:
>> http://www.antennasbyn6lf.com
>>
>> 73, Dave K3ZJ
>>
>>
>>> On May 3, 2014, at 9:55 AM, Mirko S57AD <miroslav.sibilja@amis.net>
>>> wrote:
>>>
>>> Don't worry about quarterwave radials. Just put as many short ones as
>>> you
>>> can afford!
>>>
>>> 73, Mirko, S57AD
>>>
>>>
>>> 2014-05-03 5:04 GMT+02:00 Douglas Ruz <co8dm@frcuba.co.cu>:
>>>
>>>> Hi,
>>>>
>>>> I am building a vertical antenna for low bands, 160, 80, 40 and 30m.
>>>>
>>>> Unfortunately my property is small, so, i can not install quarter wave
>>>> radials for 160m. 60ft is maximun length.
>>>>
>>>> If somebody has experience or some information about short radials
>>>> systems
>>>> or some article published please let me know.
>>>>
>>>> Thanks !!!
>>>>
>>>> 73...Doug, CO8DM - Member of T48K Team
>>>> _______________________________________________
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>>
>
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