[600MRG] measuring noise level ?

[Neil Klagge]

Ed, it was interesting to me that Elecraft sets their S9 signal meters to -73 dBm. I would have thought that S9 would be a positive number. I am clueless about such things.
Thanks for the info, Ed, and also to all of you who are commenting on this topic. It is very interesting.
73,Neil, w0yse & wg2xsv

Sent from Neil's iPad....




On Sun, Jul 17, 2016 at 3:23 PM -0700, "Edward R Cole" <kl7uw at acsalaska.net> wrote:






Depends on for what your signal report is used:  Designing systems or
for just reporting reception?  When I report signal from one station
is 12-dB stronger than another that tells how well the signals are
propagated.  Of course knowing other parameters provides more
information; things like antenna gain, efficiency, noise floor, bandwidth, etc.

A dBm or uv reading is more useful than uncalibrated s-meter reading.

73, Ed - KL7UW

At 11:26 AM 7/17/2016, sbjohnston at aol.com wrote:
>uV or dBm might tell us what signal level is at the input of the
>receiving device, but still is meaningless for noise level
>comparisons between station A and station B unless the antenna
>systems are exactly the same, mounted the same, etc.  Too many
>uncontrolled variables.
>
>
>
>
>Steve WD8DAS
>
>sbjohnston at aol.com
>http://www.wd8das.net/
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73, Ed - KL7UW
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