x-Axis vs peak-blobs vs rx-meter

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oe3ide
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x-Axis vs peak-blobs vs rx-meter

Postby oe3ide » Thu Jul 22, 2021 8:23 am

Hi,

maybe it is a silly question, but which values are represented on the x-axis and the peak-blobs. It seems to be not related to the rx-meter.
See yellow marked areas in the screenshot (right click => open picture in new tab for full-image)

Thanks & 73 Ernst
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I4LEC
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Re: x-Axis vs peak-blobs vs rx-meter

Postby I4LEC » Thu Jul 22, 2021 11:39 am

Hi Ernst,
it is refered to the bin bandwidth, which given the 26dB difference, should be set at 7.4Hz

10 log (2960/7.4) = 26

73, Clay
NC3Z
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Re: x-Axis vs peak-blobs vs rx-meter

Postby NC3Z » Thu Jul 22, 2021 11:41 am

Great post by Scott a while ago with explanation.

viewtopic.php?f=6&t=2463&p=2999&hilit=itu#p2999
Gary NC3Z
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oe3ide
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Re: x-Axis vs peak-blobs vs rx-meter

Postby oe3ide » Thu Jul 22, 2021 1:45 pm

Thanks for the explanation !

73 Ernst
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Re: x-Axis vs peak-blobs vs rx-meter

Postby NC3Z » Thu Jul 22, 2021 2:05 pm

Just as an aside, since I reset my database and built it by hand again with the fast and furious pace of Ritchie's updates, I like to calibrate my S-Meter using the built in Cal tools. I use a Rohde & Schwarz sig gen and found that the stock S-meter and Spectrum call was off by .6 dB @ -73dB. Pretty damn good for no cal, but I still calibrated to be nuts on :lol:

Freq cal was off tad also, but WWV is always handy.
Gary NC3Z

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