[Elecraft] Spectrogram plot interpetation

Fri Jan 2 23:56:01 2004

Band noise is random, hence will not necessarily be high at the time
the program "sweeps" by. That's why the sharp narrow peaks and
valleys. What you have is a quite normal display for band noise.

If you had a later version of Spectrogram (costs money), you could
turn on the "peak hold" feature, let the noise play for a while and
you would get a rather smooth and accurate shape.

I note that you have the BFO adjusted to cut the lows quite a bit. To
my preference, I'd rather have the passband shifted 200 Hz lower or
so, to improve the lows. But it's quite a matter of taste.

73, Guy.

----- Original Message ----- 
From: "DAVE HEALY" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 02, 2004 9:24 PM
Subject: [Elecraft] Spectrogram plot interpetation

Would one of you astute guys please look at this and tell me what's
wrong.

http://home.internetcds.com/~barbados/spectrogram.jpg
It's my K2 at 14MHz using FL1 (OP1) on upper sideband.

Source is just band noise.

Is this normal?  Do I need a noise generator?  Why don't I have a nice
peak instead of a ripply hump?

Thanks!

-dave- N7DKK, Medford, Oregon

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