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LF: Link budget calculation or estimation of dist for given power on WSP

To: <[email protected]>
Subject: LF: Link budget calculation or estimation of dist for given power on WSPR
From: "James Cowburn" <[email protected]>
Date: Sun, 10 Jan 2010 18:33:37 -0000
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AcqSI2w7V0oc15S3Qo225FAoj/N5Lg==

 Dear LF,

Has anyone any ideas or suggestions on a resource for calculation of a link budget for WSPR over a set distance?

As it seems I can get up to GM4SLV reasonably consistently on my current antenna/power setting with a SNR of around -22dB and the limit for WSPR is around -30dB then is there a means for roughly estimating or indeed accurately calculating the Expected Max Range (EMR) at that power setting and antenna configuration?

Clearly, there are differences between separate Rx stations but if one knows the ratio between two or more Rx stations then it should be possible to pro-rate or estimate at least the signal strength at a given Rx based on its performance with other known signals.

If I can do 916km with an SNR of say -22dB then how much further would the remaining  8dB or so of WSPR detection get me, assuming the other Rx has the same capability as GM4SLV and if their capability is different, then is it fine to factor for the dB difference over known paths/signals?

Thanks in advance for any answers or pointers and best wishes to all for a great 2010

With best regards

 

 

Jim

 

 

Dr. James Cowburn G7NKS

E [email protected]

 

 

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