terrestrial microwave transmissions

Troubled as I am of late by terrestrial signals in ku band causing problems
with satellite distribution systems, I wonder if anyone here has any info on
the usage of these frequencies. I seems to be seeing great lumps of what I
assume is data running across the lower half of the band. It can wipe out
satellite reception. 10 to 12 GHz is the area of interest.

Bill

assume is data running across the lower half of the band. It can wipe out
satellite reception. 10 to 12 GHz is the area of interest.

Microwave PIRs as used in intruder alarms
Amateur radio (allocation at 10GHz)
Fixed data links (ditto)

One thought though Bill are you sure it isn't getting in at satellite
baseband 950-2010MHz - there are a lot of nasty
digital type signals in that band mobile phone etc
You just need a dodgy bit of coax or dirty connector for this to happen
Other though it might be a faulty LNB either on your installation / someone
nearby.
You can make quite a good transmitter by re-engineering an LNB

Amateur radio (allocation at 10GHz)

Would be intermittent though.Most activity would be at weekends.

Dave

"gort" wrote in message
...

Amateur radio (allocation at 10GHz)

Would be intermittent though.Most activity would be at weekends.

Dave

Packet links run constantly across the UK network, so activity is 24hours.
They are transferring node traffic and BBS traffic.
Pirate stations also use 10GHz to link from studio to transmitter sites,
which is often on a block of flats. Some systems are "digital" to throw
OFCOM off tracing the studio.

"gort" wrote in message
...

Amateur radio (allocation at 10GHz)

Would be intermittent though.Most activity would be at weekends.

Dave

This is fixed data links from towers. That much I can tell by simply
pointing an LNB (no dish) at suspect towers, then putting an obstruction
some distance in front of the LNB as a double check. Broad swathes of
'noise' (maybe 150MHz wide) across low band. I'm trying to find out how
common it is. If I can build up some sort of coherent picture I might write
it up for a mag.

Bill

Amateur radio (allocation at 10GHz)

Would be intermittent though.Most activity would be at weekends.

Dave

This is fixed data links from towers. That much I can tell by simply
pointing an LNB (no dish) at suspect towers, then putting an
obstruction some distance in front of the LNB as a double check.
Broad swathes of 'noise' (maybe 150MHz wide) across low band. I'm
trying to find out how common it is. If I can build up some sort of
coherent picture I might write it up for a mag.

TETRA links perhaps?

Peter Crosland

Would be intermittent though.Most activity would be at weekends.

Dave

Packet links run constantly across the UK network, so activity is 24hours.
They are transferring node traffic and BBS traffic.
Pirate stations also use 10GHz to link from studio to transmitter sites,
which is often on a block of flats. Some systems are "digital" to throw
OFCOM off tracing the studio.

Hmm, forgot about those.

Dave

In article , DMac
writes
assume is data running across the lower half of the band. It can wipe out
satellite reception. 10 to 12 GHz is the area of interest.

Microwave PIRs as used in intruder alarms
Amateur radio (allocation at 10GHz)
Fixed data links (ditto)

One thought though Bill are you sure it isn't getting in at satellite
baseband 950-2010MHz - there are a lot of nasty
digital type signals in that band mobile phone etc

Agree with that. More of it about all the time, ingress they call it in
some circles..


You just need a dodgy bit of coax or dirty connector for this to happen
Other though it might be a faulty LNB either on your installation / someone
nearby.
You can make quite a good transmitter by re-engineering an LNB



--
Tony Sayer

In article , Peter
Crosland writes
Amateur radio (allocation at 10GHz)

Would be intermittent though.Most activity would be at weekends.

Dave

This is fixed data links from towers. That much I can tell by simply
pointing an LNB (no dish) at suspect towers, then putting an
obstruction some distance in front of the LNB as a double check.
Broad swathes of 'noise' (maybe 150MHz wide) across low band. I'm
trying to find out how common it is. If I can build up some sort of
coherent picture I might write it up for a mag.

TETRA links perhaps?

Peter Crosland




Why single out Tetra?, there are plenty of microwave comms links, most
all phone base stations will have one or more for backhaul if they can
use it...
--
Tony Sayer

Bill Wright wrote:
Troubled as I am of late by terrestrial signals in ku band causing problems
with satellite distribution systems, I wonder if anyone here has any info on
the usage of these frequencies. I seems to be seeing great lumps of what I
assume is data running across the lower half of the band. It can wipe out
satellite reception. 10 to 12 GHz is the area of interest.

Bill

What part of the country are you in Bill?

Sean