Specttrum noise

[w9mdb]

I've have this recurring problem for quite a while.
It was happening on my 100D and now it's happening also on my 7000DLE MKII and a new computer. So that pretty much eliminates the computer and rig from being the problem.
The spectrum shows spreading which indicates of some sort in the signal like this FT8 transmission
"

Screenshot 2021-12-22 070411.png (68.04 KiB) Viewed 1775 times

noise"
Then all I have to do is cycle power on Thetis (currently using 2.8.11 k7) and it looks normal again.

Is it just me or do others see this?

Mike W9MDB

[wa2cop]

Does this show up with the antenna unplugged?

If so it’s the power supply or something near field

If it’s with the antenna plugged something far field most likely

[w9mdb]

That wouldn't explain why toggling Power in Thetis fixes it.
And this is on transmit so antenna is needed (or dummy load which I have not tested and doubt that will make any difference).

This has been happening for a long time -- multiple rigs -- multiple computers now -- multiple versions of Thetis.
Never happened on Protocol 1 on my ANAN 100D -- not until Protocol 2.

Mike

[K9RX]

Mike,
Just a stab at this .... you did say restarting fixes it so I would guess what I'm going to suggest isn't the cause. BUT the signal waveform on the limited pan display above looks very similar to what I see. I see it all across the 80M band and it peaks somewhere close to 145° (maybe 160° as it's just a little weaker at 190° RX array direction) ... it is some form of wideband radar as far as I can tell. It's not in the radio - or at least I seriously don't believe it is - here. I'm in western SC. It is about 14 db stronger than when I'm pointed at EU making LP on 80M at SS difficult if not impossible when its there. I've seen it show up just around my SS and be there all night long.

possible?

Gary
K9RX

[mcindan]

I see the same thing on transmit after the radio has been on continuously for some time (days). A power cycle of the radio via Thetis clears the issue. I assume this is a spectral display issue since my spectrum analyzer does not show any issues during transmit.

7000DLE MKii Black, Thetis 2.8.1.1, Protocol 2

[w-u-2-o]

This is typical of a firmware timing problem in P2.

If you still have both the 100D and 7000, and it's still happening on both of them using P2, proving this is simple, just revert temporarily to P1 on both of them. You can continue to use Thetis since it now supports P1, but you do have to select 192KHz sampling rates as that is the highest rate supported by Thetis in P1.

If that proves out, then all you can do is start to try different versions of firmware on each device to see if you can find one that works well for you.

Also, consider thermal effects. Does it only happen after the unit has warmed up? Again, this is indicative of firmware timing problems.

Finally, did you do the F3 modification on the 100D for P2?