Mal,
On 137kHz loops here produce 1W ERP for each 400 Watts of transmitter output.
I recall someone posting here from the U.K. that his vertical on 137
produced 700 mW ERP with 650 Watts transmitter output so sometimes
loops are superior.
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Fri, Jun 11, 2010 at 10:21 AM, Laurence KL7UK
<[email protected]> wrote:
>
>
> Mal - are you saying small lambda loops are ineffective for dx working at
> LF, say 137Khz? (where within practical verticals give poorer performance
> in wooded areas....or arent feasible).
>
> Past results would not concur; Small backgarden loops producing around 3W
> ERP (on a good day!) have been repeatably seen at >12,000kms - so I beg to
> differ.
>
> Cheers
>
> ________________________________
> From: [email protected]
> To: [email protected]
> Date: Fri, 11 Jun 2010 14:39:17 +0100
> Subject: LF: LF/VLF
>
> All
> Forget about loops, ground rod induction etc if you want to radiate a dx
> signal.The average person could shout and be heard further. A mechanical
> alert/fire siren can be heard several miles away by ear.
> For serious distance DX on vlf a vertical configured antenna is the only
> solution, ie loaded inv L, T ant and some insulated ground radials as long
> as possible.
> one earth spike at the base of the vertical drop wire connected to radials.
> This is the basic approach and can be fine tuned later once you are making
> progress and being heard/seen a few hundred kilometres away.
> 73 de mal/g3kev
>
>
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