Message-ID: <004501c906e5$9e1b3370$0301a8c0@mal769a60aa920>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <000d01c9052d$6f142c30$0301a8c0@mal769a60aa920><C6D17EC6BC594EC7A5CAAF551968B84E@AGB><003e01c90543$b12bb870$0301a8c0@mal769a60aa920><20080823193946.20d4b66b@sighthound.demon.co.uk><005701c90555$0018bcb0$0301a8c0@mal769a60aa920><9256A09B44B94949B34506B5E7260A84@AGB><20080824233353.muhlmpin3r34kggk@webmail4.kuleuven.be><002401c906de$82e26030$0301a8c0@mal769a60aa920> <20080825194046.53199091@lurcher.twatt.local>
Date: Mon, 25 Aug 2008 20:06:00 +0100
MIME-Version: 1.0
Subject: Re: LF: 500khz rtty
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Buy a QTH like mine and find out first hand.

----- Original Message ----- 
From: "John Pumford-Green" <gm4slv@sighthound.demon.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, August 25, 2008 7:40 PM
Subject: Re: LF: 500khz rtty


> On Mon, 25 Aug 2008 19:15:10 +0100
> "mal hamilton" <g3kevmal@talktalk.net> wrote:
>
>> I have maximum advantage with the permitted power
>
> How do you verify your ERP? Your NoV application must have included
> some indication of how you would do it.
>
> How do you ensure your TX power is not excessive, given the self
> proclaimed superior location and antenna?
>
> As you say, local measurement of field strength is only the way to do
> it.
>
> I've done it, many times, using a laboratory standard, calibrated,
> professional MF field strength meter, as well as my own home designed
> (I can provide you with the maths for it) loop antenna and calibrated
> receiver.
>
> My take off is similarly uncluttered to yours and I've measured FS at
> ranges between 600m and 3km, in all directions around my TX antenna.
>
> I presume, as the professional radio experimenter (not appliance
> operator) that you are, that you've done likewise? I'd be interested in
> your results.
>
> Can you give an indication of the overall loss resistance, the
> radiation resistance and radiation efficiency of your wonderful 100'
> high 1/4 wave inverted-L, and the resultant estimation of maximum TX
> power allowable to remain below 1W ERP?
>
> I guess you'll have these figures to hand, since you are one of the
> most technically able, numerate and scientific of the LF/MF community,
> by your own, frequent, admission.
>
>
>
>
>
>
> No virus found in this incoming message.
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> 12:15 PM
>
>
>