Again I have no idea what either of you are on about?

 

Neither have they, lol

only joking

so best we have this bit of test gear generally. Is it something i could use and understand?

I suppose for 868 you would be as well just setting up a cheap rtl-sdr, i use the rf explorer for wifi interference issues as well so its worth it.

I started a thread a while back about the rtl sdr.

link?

So basically just another type of spectrum analyser

so best we have this bit of test gear generally. Is it something i could use and understand?

 

I think so. It's just setting a frequency range, and it does the rest of it pretty much automatically.

Problem is, once you've found there is another signal, what do you do?

Yes, it's a bit like these companies that offer fullbody CT scans with no preexisting symptoms.

Who's to say you won't see the same interference on another site that never has and never will have issues?

The one I've seen a few times is cheap baby monitors that transmit a continuous signal in 868MHz, they are quite obvious. But lots of other stuff is much harder to track down.

 

The standard says that for grade 1 and 2, it's 31s out of 60s to signal jamming, 3 and 4, 11s out of 20s. Many of them also detect if messages are dropped, but only if they have 2-way RF.

Sounds about right. I managed to jam the Honeywell in 31 seconds when testing earlier. Tried two portal versions with different firmwares and all did the same. No way of adjusting either.

The spec is any 31s out of 60s.

 

Drive a jammer with a 50% duty cycle, period of about 0.05s, and the jamming detection won't go off, but nothing will get through.