Sn margin

[#1]

Hi, just a quick question, is it normal for the SN margin down to go up and down?
Eg. From 3.5 db up to 5.4db and then settle back down to 3 or 4.I've never noticed before now.
Thanks in advance
John

[#2]

if that is over a 24 hour period then it is

But if it is jagged bursts it would tend to indicate an interference source

[#3]

Hi thanks for prompt reply, it was 5.1 this morning now its 4.1, ill keep an eye on it over next 24 hrs.
Regards
Jono