Content-Transfer-Encoding: 8bit
Message-ID: <5.1.0.14.0.20020122183106.00aa41f0@gemini.herts.ac.uk>
Date: Tue, 22 Jan 2002 18:51:32 +0000
To: rsgb_lf_group@blacksheep.org
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Subject: Re: LF: Big signal
In-reply-to: <3C4D7524.F7D8A146@netscapeonline.co.uk>
References: <5.1.0.14.2.20020120184653.00a411b0@mail.pncl.co.uk> <5.1.0.14.0.20020121134048.00aa7958@gemini.herts.ac.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii; format=flowed
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>

Dear Mal, LF Group,

At 14:20 22/01/2002 +0000, you wrote:
>Ref your recent power measurements on the MM0ALM signal and observations.
>I have measured you power and observed two readings. One set of figures during
>daytime and weekend normal CW acty and another at night when you are on beacon
>for TA tests on QRS and Measles mode.
>You obviously keep the power down during normal CW but at night you are very
>strong. I will not
>declare here what the figures are but what measurements would you expect me to
>get at this distance

During the day,  I use my 8m high, 40m long inverted L. At night, while the 
neighbors can't complain about aerials spoiling the view, I put up a 13m 
high mast under the middle of the top wire, raising it up into an inverted 
L configuration. This increases the radiated signal level by about 4dB over 
the daytime level. I'm sure most readers of this reflector heard quite 
enough about the 300+ field strength measurements I made on this antenna a 
few months ago to establish ERPs, losses, etc., but suffice it to say that 
on 136k, running my maximum 1200W, my "daytime" ERP is 400mW, and "night 
time" ERP is 1W. On wet days, these levels fall by a dB or two due to 
increased losses.

So what's your ERP?

Cheers, Jim Moritz
73 de M0BMU