From memory sun outages should last around 5min - used to get them on
occasion on Intelsat. There is nothing you can do about it - with the
sun behind the satellite the termal noise shoots way up swamping any
signla you may have. This was with 30m dish so I suppose with a small
dish you get wider beam width and longer period where the dish 'sees'
From: Richard Naylor [mailto:firstname.lastname@example.org]
Sent: Tuesday, 1 August 2006 05:05
To: Simon Lyall; nznog
Subject: Re: [nznog] Wireless link adversly affected by the sun?
At 04:25 PM 8/1/2006 +1200, Simon Lyall wrote:
On Tue, 1 Aug 2006, neil gardner wrote:
> However on a serious note there was a time I recall that IHUG warned
> about an expected outage (on Satnet) due to particularly bad solar
> activity... They were able to predict this in
advance so it MAY not
Those were "Sun Outages" which is when the Sun is directly behind the
satellite as viewed from the ground station. They happen around
the equinoxes, ie not this week.
I can confirm they happen. When we webcast the rowing at Karapiro last
we lost the sat link at 11:50 each day for one hour. It was equinox and
sat is about 5degrees off due north. The providers all said it was my
temporary install, then it was thermal, then we looked at the NSS5
and their sun tables documented it well - just they hadn't read their
webpages. The outage lasted about an hour, but that could have been
due to my mad panic to get something going again.
I now use 2 dishes on two different satellites and balance the traffic
between them. IPSTAR being 20deg above the horizon means you get issues
twilight. (which means you go have dinner and align it afterwards, in
The sat operators refer to it as "sun strike".
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