Satellite dish and conservatory

In fact I am a Christian and channel 767 is the Inspiration network, a
Christian Broadcast channel..



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Lawrence Zarb wrote:
In fact I am a Christian and channel 767 is the Inspiration network, a
Christian Broadcast channel..

Couldn't God boost the signal strength for you?

Vaughan wrote:
Lawrence Zarb wrote:
In fact I am a Christian and channel 767 is the Inspiration network,
a Christian Broadcast channel..

Couldn't God boost the signal strength for you?

Of course not, he doesn't exist!

"Lawrence Zarb" wrote in message
news:[email protected] .mailgate.org...
In fact I am a Christian and channel 767 is the Inspiration network, a
Christian Broadcast channel..

Yes well, I think having looked at the signal in some detail on your behalf
this afternoon that if that channel was going to be an important part of my
viewing I'd consider a Zone 2 dish. That's the slightly bigger one intended
for the north-west third of the UK. I'm assuming you're not in the
north-west third of the UK. . .

Bill

Bill,

I live in Surrey, and it was my consideration.

As I have a second digibox I was thinking of replacing the LNB with a
better twin/quad output unit.

Would this also sove the problem?


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"Lawrence Zarb" wrote in message
news:[email protected] .mailgate.org...
Bill,

I live in Surrey, and it was my consideration.

As I have a second digibox I was thinking of replacing the LNB with a
better twin/quad output unit.

Would this also sove the problem?

Only if the LNB you have now is performing less well than the new one would
on that frequency, and if the degree of improvement is enough to cure the
fault.

I think the door-opening issue is a red herring. Your reception is marginal,
that's all that matters. It could be the LNB that's faulty or it could be in
spec but inadequate for a weak mux at the edge of the band. Slight dish
misalignment or distortion could be responsible. The receiver could have a
tuner problem affecting the top end only. The cable could be
cheap/wet/kinked, affecting the top end only.

Bill

Thanks for your response Bill,

for your information I have already tried 2 other LNB's ,and another
digibox.

I have had this setup for 3 years now and its only in the last 4 months
that I have been having this problem.

At the moment I'm looking at getting the larger Zone 2 dish...

Lawrence


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"Lawrence Zarb" wrote in message
news:[email protected] .mailgate.org...
Thanks for your response Bill,

for your information I have already tried 2 other LNB's ,and another
digibox.

I have had this setup for 3 years now and its only in the last 4 months
that I have been having this problem.

At the moment I'm looking at getting the larger Zone 2 dish...

Because the channel is at the top end of low band, the LNB downconverts it
to a frequency right at the top of the satellite IF band. This means that
the signal going down the coax is actually the highest frequency that the
cable has to carry. Therefore the slightest cable fault is likely to be
significant. I suggest you change the cable, or at least install a temporary
cable as a test.

I have seen instances in which the strength of the higher muxes at the
receiver has been many dBs below the lower ones. Even when they remain
strong enough per se, the fact that they are perhaps 25dB below others seems
to upset many satellite receivers.

Bill

"Bill Wright" wrote in message
...
"Lawrence Zarb" wrote in message
news:[email protected] .mailgate.org...
Thanks for your response Bill, for your information I have already tried
2 other LNB's, and another digibox. I have had this setup for 3 years
now and its only in the last 4 months that I have been having this
problem. At the moment I'm looking at getting the larger Zone 2 dish...

Because the channel is at the top end of low band, the LNB downconverts it
to a frequency right at the top of the satellite IF band. This means that
the signal going down the coax is actually the highest frequency that the
cable has to carry. Therefore the slightest cable fault is likely to be
significant. I suggest you change the cable, or at least install a
temporary cable as a test.

I have seen instances in which the strength of the higher muxes at the
receiver has been many dBs below the lower ones. Even when they remain
strong enough per se, the fact that they are perhaps 25dB below others
seems to upset many satellite receivers.

Bill

Do you mean 25dB, or should it be 2.5dB or 2 to 5dB perhaps? 25dB sounds
like a very big difference. If it really is 25dB then in theory you could
still get some Sky channels with a dish that was "25dB smaller". By my
calculations that would mean a 3cm dish!

Perhaps that's how the "pipe antenna" works. I don't see how the capture
area can be any larger than the end of the pipe which is about 12cm, making
it equivalent to a 12cm dish, but the length of the pipe (about 1 metre)
would work like a boresight and narrow the field of view enough to pick out
just one satellite. Has anyone here ever tried a pipe antenna?

"Stephen" wrote in message
...
"Bill Wright" wrote in message
I have seen instances in which the strength of the higher muxes at the
receiver has been many dBs below the lower ones. Even when they remain
strong enough per se, the fact that they are perhaps 25dB below others
seems to upset many satellite receivers.

Bill

Do you mean 25dB, or should it be 2.5dB or 2 to 5dB perhaps? 25dB sounds
like a very big difference. If it really is 25dB then in theory you could
still get some Sky channels with a dish that was "25dB smaller". By my
calculations that would mean a 3cm dish!

Unfortunately your calculations are based on an incorrect assumption. The
dish size is required primarily to provide enough signal at the LNB to give
an adequate ratio between the signal and the LNB noise. The signal is
downconverted and amplified a great deal in the LNB, but of course the s/n
ratio does not improve. The LNB output is far stronger than is needed at the
receiver input. So quite horrendous things can happen between the LNB and
the receiver. Once line power for the LNB is taken care of, the output from
an LNB can be transmitted from a half wave dipole (about half an inch?) and
received on a similar aerial several yards away, with good results. But
receivers tend not to like massive inequalities of signal level.

The high level of LNB outputs is a big factor in satellite IF breakthrough
into UHF circuits.

Bill