From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <20090125092908.0aec06a4@lurcher><7EC707A6E2D94414AEBBC52C6159581C@JimPC><AAD643EEA70C4FC99B4B3E17041C8F54@JimPC><002001c97f0a$cf16fac0$ae01a8c0@youry0mkaz8jaq><20090125165335.47fc3399@lurcher><7690F13DCE5D44BA8A5AA126607E7979@JimPC><fc7eccec0901250940p388c4cb0gb9d3ed78cb605393@mail.gmail.com><20090125180430.1d63e1c7@lurcher><6449616DC58940A19C537A59F53828DA@AGB><00d201c97f20$bd909520$6401a8c0@asus><00d301c97f22$87d998d0$6401a8c0@asus> <20090125194232.05798210@lurcher>
Date: Sun, 25 Jan 2009 21:07:29 -0000
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Subject: RE: LF: Re: WSPR 503.5
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Hi John, LF,

You wrote :-
>>>>Of course 2mW ERP from a small antenna won't go as far as 2mW ERP from a
large one.

The main criteria here is that 5 watts to a large antenna would produce a
higher ERP than from a small antenna so therefore the 5 watts would go
farther.

Question - would 2mW ERP from a large antenna go farther than 2mW from a
small antenna to the same extent as the 5 watts to the different antennas?

Gary - G4WGT.

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of John P-G
Sent: 25 January 2009 19:43
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: WSPR 503.5

On Sun, 25 Jan 2009 19:24:23 -0000
"Gary - G4WGT" <g4wgt@tiscali.co.uk> wrote:

> 
> When I make the calculation I will insert the correct figure.
>
Hello Gary, LF,

I'm getting a fairly reliable signal from you, with just enough QSB to
dip under the decoding margin from time to time.

As to power reporting, I see that most people on LF/MF are attempting
to estimate ERP, and use this figure in the beacon data.

There was much discussion on the WSPR forum on the merits or otherwise
of this approach, in the HF sphere at least.

It might be easier if we adopted the same approach as is recommended
for HF use - to report the actual TX power, not ERP.

I see your last beacon is reporting 3dBm! Wow... that really is "flea
power". Of course 2mW ERP from a small antenna won't go as far as 2mW
ERP from a large one.

Cheers,

John
GM4SLV