[Fwd: [Fwd: LF: SV: How long is a piece of wire?]]

[Quilter's Confectionery]

André,

I have it. I will try to copy and send it out this week. What is your Snail
Mail Address?

Take Care, Larry :-)                Having invented these Logic Machines,
it was                                        inevitable that humans would
be seduced by them.

At 01:55 AM 5/2/98 -0400, Randy Mays wrote:
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>Date: Fri, 01 May 1998 21:44:06 -0400
>From: "André Kesteloot" <akestelo@bellatlantic.net>
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>To: AMRAD Tacos <tacos@amrad.org>
>Subject: [Fwd: LF: SV: How long is a piece of wire?]
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>Taco Gang,
>The HamRadio magazine issue mentioned below (September 1982) is one of the
very
>few I do not have.
>Does anyone have that issue, and if so, could he contact me? I'd like a xerox
>copy of that article.
>Thanks
>73
>André N4ICK
>**************************************
>
>Peter Bobek wrote:
>
>> Hi John (SM6LKM), hi all,
>>
>> in the article I mentioned the author did not specify "what is optimum top
>> loading". IMHO I would guess "optimum" toploading is represented by a
>> "disc" on top of the the vertical structure to reso-
>> nate it without any other means. Since this is impractical/impossible in
>> most cases on LF the disc
>> will be replaced with as many wires as necessary and as horizontal as
>> possible (not sloping down!) and connected at the ends to come close to the
>> dimensions of the required disc. The top-hat of the 77.5 kHz transmit
>> antenna of DCF77 is built that way. This, however, requires additional
>> masts of the same height as the transmit aerial (and will create a lot of
>> other problems)!
>>
>> BTW: DCF77´s antenna is 200m high and the transmitter output power (not:
>> ERP) is 50 kW.
>> The signals you can hear on129 kHz and around 124 kHz (broadband stuff) are
>> coming from the
>> same transmitter site (about 30 km east of Frankfurt) - using 100/125 kW -
>> while the signal on 139 kHz
>> is coming from Burg (near Magdeburg) SW of Berlin.
>>
>> Re: UMBRELLA-antennas...
>>
>> John Belrose/VE2CV  published a 6-page article "Folded umbrella top loaded
>> vertical antenna"
>> in HAMRADIO 9/1982 containing a lot of theory adaptable to any band. In the
>> references-list at
>> the end he mentions two other publications (which I do not have):
>>
>> 1. A.F. Gangi, et al, "The characteristics of electrically short, umbrella
>> top-loaded antennas",
>> IEEE Transactions on antennas and propagation, AP-13, November 1965, pages
>> 1185-1194
>>
>> 2. C.E. Smith and E.R. Graf, "Increased capacity for VLF umbrella antennas
>> using multi-wire
>> rib construction", IEEE Transactions on antennas and propagation, November
>> 1968, pages
>> 766-767.
>>
>> Regards,
>> Peter/DJ8WL (DA0LF on LF)
>
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