[UK-CONTEST] OT: 20m Trap design

[Clive GM3POI]

James, Just go to the VE6YP website and download his software for designing 
Coax traps.
Also see W8JI.com on the same subject. 73 Clive GM3POI

> ----- Original Message ----- 
> From: "James Hill" <jrh at g0fhm.net>
> To: "UK-Contest" <uk-contest at cd ARRL handbook 2006 versionontesting.com>
> Sent: Saturday, November 01, 2008 3:53 PM
> Subject: [UK-CONTEST] OT: 20m Trap design
>
>
>>
>> Hi Guys,
>>
>> I know there are some good antenna brains on here.....
>>
>> Basically, my 40m Carolina Windom is shot (havent got it down for
>> autopsy yet), and I'm looking to replace it with a 20m vertical (half
>> wave CB type at the correct length, with the matching unit removed from
>> the bottom).
>>
>> However, my 80m inverted L does not seem to work too well on 40m (tunes
>> up at 1:1), but appears to be terribly inefficient on both TX & RX.
>> Works fine on other bands (even managed to work 3B7 on 17m with it!).
>>
>> What I plan to do, is something along the lines of the "battle creek
>> special", and put a 20m trap on the top of the vertical, and extend it
>> with wire to the top of the tree at the bottom of the garden, to make it
>> good for 40m too.
>>
>> I've googled for trap designs, and got designs for virtually every type
>> of trap, except the type that I want!
>>
>> I've read a lot about coaxial traps, and that appears to be the way to
>> go, as I have drum after drum of RG58 here that I will be able to use.
>> Power wise, then 100w tops will be the order of the day, no QRO here!
>> Although an LC type trap will be considered, if it's quite easy to make,
>> and I have the required capacitors kicking around.
>>
>> Any thoughts? and more importantly, links to any designs would be
>> appreciated!
>>
>> Thanks,
>>
>> James G0FHM
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>>
>
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