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Re: LF: Alpha benchmark

from [Roger Lapthorn] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Alpha benchmark
From: Roger Lapthorn <[email protected]>
Date: Fri, 21 Jan 2011 21:35:11 +0000
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Mal/All,

For what it is worth, these are the Alpha figures measured here (JO02dg) this evening around 2115-2130z with my large single turn loop and tuned preamp using Spectran on 48k sampling rate with 1.5Hz resolution:

11.905kHz = -47.1dB (about 20dB over the noise)
12.649kHz = -47.7dB
14.881kHz = -42.7dB

My loop may not be properly set onto 8.97kHz yet as I need to peak the tuning. My loop is roughly W-E pointing. Perhaps experts here can advise if these are good/bad figures?

73s
Roger G3XBM

On 21 January 2011 19:12, mal hamilton <[email protected]> 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
 
 



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Attachment: alpha11905.jpg
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