[time-nuts] Leakage, tinySA

[Dana Whitlow]

Hal, my 10 MHz birdie is at a level of about -95 dBm, which puts it a
little more than
10 db above the noise floor in 3 kHz BW.

I've found that the "spur removal" function sometimes works, but not
always, if I
change the IF frequency setting to 433.9 MHz.  It's mostly bimodal behavior-
sometimes the spur remover kills it entirely, but on some sweeps it only
reduces
the spur level by about 10 dB.  And on occasional sweeps the improvement is
by some other amount.

Dana


On Mon, Jan 18, 2021 at 2:47 PM Hal Murray <hmurray at megapathdsl.net> wrote:

>
> notfaded1 at gmail.com said:
> > FWIW I don't have spurs at 10MHz.
>
> Have you looked carefully?  I have to zoom in on the bandwidth in order to
> see
> it.  Somebody else called it a birdie.
>
> My unit came from R&L.  I'm reasonably sure it's genuine.
>
> If I look at 10 MHz center and 25 or 100 k span, there is a faint
> something
> down in the noise.  Most of the time, the marker that automagically ends
> up on
> top of the highest peak is in the middle.  At a quick glance, there is
> nothing
> there.  If I look carefully, there is usually a small bump about 3 kHz
> wide.
>  It's easier to see at 25 kHz since it's wider.  It's faintly visible on a
> waterfall.
>
> That's with the antenna terminated or when I wander down the street.
> There is
> a similar thing at 50 MHz.
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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