[time-nuts] Leakage, tinySA

[Dana Whitlow]

Hi Dan,

I remember seeing the list of checks to make regarding knockoff clones,
and even remember a few of them: to wit:

1. Comes in molded packaging, not poly foam.  Check!
2. Has the internal shielding.  Check!
3. Passes all the self tests, including 7 & 8.  Check!

I had high hopes of moving the birdie off 10 MHz by changing the IF
frequency
setting, but this did no good.  I'd sure like to see a detailed block
diagram, but
do not know where to look.

I also tried turning on the "spur eliminator", which did help by several
dB, but
my birdie still sits a few dB able the displayed noise floor in the
narrowest
available resolution BW of ~ 3 kHz.

So, for the moment, I'm out of ideas.

Thanks,

Dana


On Sun, Jan 17, 2021 at 5:21 PM Dan Kemppainen <dan at irtelemetrics.com>
wrote:

> Dana,
>
> Just an FYI. Apparently, there are knockoff clone copies of the TinySA
> out there. (Yes, making a knockoff clone of a $50 spectrum analyzer is a
> thing, go figure!)
>
> Apparently, these have substandard performance, and a host of
> issues/concerns. I ran into this on the TinySA web site. They have some
> hints on how to detect if you have a clone or not. Might be worth
> looking into to see if you have a sub-par copy.
>
> Dan
>
>
>
>
> On 1/16/2021 12:00 PM, time-nuts-request at lists.febo.com wrote:
> > Date: Sat, 16 Jan 2021 05:45:19 -0600
> > From: Dana Whitlow<k8yumdoober at gmail.com>
> > To: Discussion of precise time and frequency measurement
> >       <time-nuts at lists.febo.com>
> > Subject: Re: [time-nuts] Leakage, tinySA
> > Message-ID:
> >       <CADHrwpd2B=p=
> qRJLG-Bw68WGDAhmLHE9QULPuPijUqeDApzGcw at mail.gmail.com>
> > Content-Type: text/plain; charset="UTF-8"
> >
> > Another data point:  My newly-received TinySA has a big birdie at 10 MHz,
> > which is a
> > disappointment since I had hoped to use the unit as a sniffer to track
> down
> > leaks in my
> > 10 MHz distribution system.  This birdie in the TinySA persists even when
> > nothing is
> > connected to the input and does not vary in amplitude when I move around
> > the house,
> > or with time while I'm sitting still with the unit.
> >
> > I, too, received no manual.
> >
> > Dana
>
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