Re: Dual Link Margin script SR1lm.pl
David J Taylor GM8ARV 🏴 🇪🇺
On 16/11/2021 20:02, Ernst Lobsiger via groups.io wrote:
David,Yes, empirical, but good enough to compare across the same devices. My guess
is that the passband shape will come into it, and how that affects both the
noise distribution across the passband, and the shape of the recovered digital
signal. It wouldn't surprise me if different companies had different definitions.
Some definitions talk about "when the receiver stops working", but what does
that mean? With digital systems there isn't a sudden stop between LM := +0.1
dB and LM := -0.1 dB, so should the "acceptable" bit error rate come into the
I see the value of these measurements as being for individuals to watch for any
gradual degradation in their system or to monitor improvements they may make,
or for comparisons across Europe to answer questions such as "I live in
Helsinki - what dish might I need?".
The more monitoring stations sharing their data the better!
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