[Lowfer] Vertical antennas and top loading

[Lee]

Fig 4 is what JAM 187.015 khz Southern California is using since 09. The only difference is 4 top hat radials with the skirt instead of 6 top hat radials and the skirt. I have been meaning to add the 5th and 6th radials but I would need to lay the whole assembly down to do that. Maybe this summer.
Lee 



-----Original Message-----
>From: Bill Ashlock <ashlockw at hotmail.com>
>Sent: Feb 7, 2012 4:22 PM
>To: lowfer at mailman.qth.net
>Subject: Re: [Lowfer] Vertical antennas and top loading
>
>
>Jay,
>
>Is it generally agree that the effective height of loaded vertical having a top hat increases with top hat size?
>
>BTW, my "Y" antenna is working out pretty well in terms of the Rac, even with a foot of snow on the ground (although far less snow than average for this time of year). I'm about ready to reduce the size of the antenna's top hat in order to reduce the size of the fringe field so that a larger percentage of the field can be captured with the counterpoise, hence even lower Rac. I'll be watching the radiation efficiency closely to see if the above 'effective height' theory holds.
>
>Bill
>
>> Date: Tue, 7 Feb 2012 18:05:00 +0000
>> From: dexter.mc at gmail.com
>> To: lowfer at mailman.qth.net
>> Subject: Re: [Lowfer] Vertical antennas and top loading
>> 
>> Figure 4 is basically what I had up for Lowfer NC from about the mid 90s 
>> until early 2k. 
>> 
>> Dex
>> 
>> 
>> jrusgrove at comcast.net wrote:
>> > Stumbled across this while looking for other things. Nice presentation on the value of top loading 
>> > short vertical antennas.
>> >
>> >  http://beacon.nautel.com/Resources/Docs/Whitepapers/SAC-PortableAntenna.PDF
>> >
>> >   
>> 
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