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Re: LF: Alpha benchmark

To: <[email protected]>
Subject: Re: LF: Alpha benchmark
From: "Markus Vester" <[email protected]>
Date: Fri, 21 Jan 2011 23:55:29 +0100
Importance: Normal
Reply-to: [email protected]
Sender: [email protected]
Yes there are quite large but repeatable diurnal level variations, especially for the furthest Alpha transmitter. Around last March equinox, I recorded some plots, with the dashes from the three sources separated on each frequency.
 
Best regards,
Markus (DF6NM)
 

Sent: Friday, January 21, 2011 8:44 PM
Subject: Re: LF: Alpha benchmark

Hi Mal

I find the Alphas vary in strength throughout the day.  Are you saying that at your location they're fairly stable and do not have diurnal variation ?

I guess this may be due to the distances involved if you see fairly stable signals...

Would be curious to know if you have made a long term observation...

73 Scott
VE7TIL

On 1/21/2011 11:12 AM, mal hamilton wrote:
vlf
As a guide for those interested in VLF 9 Khz it would be useful if each station could use the Alpha station on 11905 Khz as a benchmark for quality of reception.
and let us all know hown efficient their RX system is.
In my case using an inv L 150 metres total length not resonated the report is minus 60 dB with a sig over noise of 25 dB. This seems an acceptable system for 9 Khz reception.
I can do better by resonating the antenna,  or using my 136 antenna system re-resonated for 9 Khz
I get the impression that at some locations receiving is a problem, for various reasons including noise from being in the middle of a Urban environment.
Can we have some data.
de mal/g3kev
 

Attachment: Alpha_levels.png
Description: PNG image

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