Message-ID: <6EB8BCCB9A5242528BFCA39D36F9A15A@p4>
From: "Mark" <markhughes1@blueyonder.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <fc7eccec0902231203u27322704oc0872d87ccbb4328@mail.gmail.com> <49A30C77.4050301@telia.com> <fc7eccec0902231320x774072agc7878f8fbe4e4704@mail.gmail.com>
Date: Mon, 23 Feb 2009 22:55:47 -0000
MIME-Version: 1.0
Subject: Re: LF: More WSPRing
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Hi all,
Not withstanding the fickle nature of propagation, my WSPR / Grabber receive 
antenna is not the most efficient, and does suffer from an elevated noise 
floor compared to my main station antenna.
Signals are typically 6dB stronger on the inverted L, though I have not 
spent any great effort quantifying the differences.
One of the true benefits of WSPR is measurement of signal level variations 
at one location, but to get  meaningful data on relative strength between 
stations would take many receive stations with identical equipment.
That is of course eminently possible, a cheap PC and a standard ferrite rod 
active receive system + simple SDR would enable a major propagation study.
Most amateurs have a PC and internet, if a cheap design were published for a 
WSPR monitor station, we could potentially get many listening stations QRV 
and gather a lot of interesting data. not many transmitters need be on, so 
no problem for non NOV holders.
With other 'front ends' any band could be monitored.

How cheap can we make such a system, is anyone interested?
Mark GM4ISM




----- Original Message ----- 
From: "Andy Talbot" <andy.g4jnt@googlemail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, February 23, 2009 9:20 PM
Subject: Re: LF: More WSPRing


> That's very interesting -  I appear to be 10 - 15dB better S/N with
> you Johan (-5db S/N) at 1200km, than with GM4ISM (-20dB S/N) at 577km.
>
> Background noise levels ?
> Sea path ?
>
> Andy  G4JNT
> www.g4jnt.com
>
>
>
> 2009/2/23 Johan H. Bodin <jh.bodin@telia.com>:
>> Solid copy in JO67MR Andy, including the CW ID!
>>
>>
>> 73
>> Johan SM6LKM
>>
>> Andy Talbot wrote:
>>> 503.870 +23dBm ERP running now,  34.375% duty cycle ...
>>>
>>> Andy  G4JNT
>>> www.g4jnt.com
>>
>>
>
>


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