Twenty looks terrible. You may have to increase the attenuation a bit and crank down the bandwidth to 10khz or 30khz to show up the crud hiding in the grass. Can you do a second pass on twenty? Keep the fundamental peak to -20 dbm.

- f

- f

On Mon 25 Feb, 2019, 7:02 AM Tim Gorman, <tgorman2@...> wrote:

Nice job.

It looks like all the bands except 20m are pretty good. I assume this
was straight cw. I don't see any spurs.

It would be interesting to see the same sweeps with an audio tone
feeding the microphone for the same output levels. That would get all
the mixers into play as well.

I assume you are going to do two-tone and carrier suppression tests at
some point? I'm waiting on my v5 to come. I ordered back on 2/7 like
Ron did but I've not heard anything on it. When I get it going I'll
duplicate your measurements using my less expensive Rigol 815!

tim ab0wr

On Sun, 24 Feb 2019 14:24:04 -0800
"Jim Sheldon" <w0eb@...> wrote:

> My wife was very nice to me and bought me a brand new Siglent SSA
> 3021X spectrum analyzer for my upcoming 77th birthday.
>
> I have 1 Version 5 uBITX and another on the way.? The one I have I
> built up on my old, ugly open frame aluminum chassis for ease of
> getting at test points, etc.? I did not do a power output check, but
> during my spectral purity tests into a 20 watt dummy load, it was
> warming up the load pretty good even on 10 meters with the power
> control right where the factory set it.
>
> Attached pictures are screen saves from the spectrum analyzer in .jpg
> format as they were being measured.? No editing has been done on any
> of them.? As I was uploading the pictures, I realized I did not save
> pictures for 30 and 12 meters so I'll re-do them and post the results
> at a later date.? These are posted "as-is" for people to see and make
> their own conclusions from them.?
>
> Though I got a calibration certificate with it from the Siglent
> factory, I don't know how far I can trust that.? I do have a GPS
> Disciplined oscillator feeding the 10 MHz external reference.? As I
> get more experience with the SA, I may be able to get closer
> indications that this first run, right out of the box.
>
> Jim Sheldon, W0EB
> TSW Project Coordinator
>
>
>