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Technical Section page 13
How to use the SatCure Satellite
Finder
Signal Meter
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I can
get most channels from Sky Digital
(Astra2 at 28.2'E) but the signal
quality is low. Should I buy a
satfinder meter to align the
dish?
Absolutely NOT. You have already
found the satellite and you already
have the best meter available - the Sky
Digibox "signal quality" display in the
on-screen menu. Use that to finalise
the alignment of your dish and LNB.
I am a
newbee in satellite, I am somewhat
confused in pointing the satellite dish
at Hot Bird. When you say 13 degrees E
of south, was it S13'E? Does it mean
make 13deg from the south toward the
east? sorry for this dumb
question.
Point the dish south according
to your compass.
Move it East by 13 degrees
according to your compass.
Now find out the magnetic
compass variation for your location
and move the dish further west by
that amount (about 5 degrees in the
UK) - see compass
page.
Now that you have the
approximate position, set the
elevation angle (about 24' above the
horizontal in Manchester, 26' in
London). Note that this is the
direction of the satellite and NOT
the angle of the actual LNB arm.
Most dishes have angle graduations
marked on the bracket. In the UK,
the dish arm is likely to be almost
horizontal (dependent on the design
of the dish).
Finally, use your satellite
signal meter to align the dish
*accurately* on the satellite.
NOTE: this works only in the UK near
the "Greenwich Meridian" line. See
this
page to find out why.
We no longer sell a meter with 22kHz
switch. The version without is cheaper and
quite adequate, as you can see in the
movie, below this map.
Find out which way to point your
dish!
Select your
desired satellite and your
location.
(Type in your address like "112
princess road, Manchester, UK")
Hmm, nobody ever asked me that
previously but it's not such a stupid
question! :o)
Compass is for approximate dish
setting, using earth's magnetic field
as a guide to the location of
that little metal box floating TWENTY
THREE THOUSAND MILES AWAY in space. But
there's a satellite positioned
approximately every three degrees along
the circle above the equator - some
giving strong signals in the UK, some
weak. So an error of a couple of
degrees East or West will get you the
wrong satellite.
Meter shows the actual signal
from that little satellite so you can
do the final alignment with ultimate
accuracy.
Can I power it
from the receiver or do I need a power
supply?
It is designed to be powered by any
satellite receiver but you can power it
from a suitable regulated DC supply or
12v battery instead. Instructions are
included with the meter.
Who else
supplies this meter with 22kHz
switch?
Nobody else supplies this exact
model, however there are similar meters
available (but more expensive).
Why does the
meter whistle and indicate a signal
even when the dish is pointing at the
ground?
The meter is very sensitive and can
not tell the difference between a true
satellite signal and background noise
reflected from the ground and
surrounding walls. In addition, if the
LNB is not connected properly, the
meter will register "noise" from the
cable. Turn the sensitivity control
down until the meter stops whistling
with the dish facing downwards. Then
move the dish to locate the required
satellite.
H28-8235d
Digital/Analogue meter
This meter has a built-in 22kHz tone
generator which you can switch on or
off to select "high band" with a
"Universal" LNB. If you do not have a
"Universal LNB" then there is no need
to buy the "d" version of the meter.
(All Sky "minidishes" use a "universal"
LNB).
The analogue version does not
have a built-in 22kHz tone generator
and is, therefore, cheaper. The
analogue meter
H28-8235a
can still be used to align your dish
but it can only "see" the signals on
"low band" with a Universal LNB. (It
will pass the 22kHz signal from a
suitable receiver so the receiver can
be used to select 'high band' through
the meter).
Please note that both meters have a
needle scale indicator - NOT a digital
numbers display and NOT an LED bar
graph display. I mention this because
people keep asking. In fact some people
ask "how can it measure a digital
signal if it doesn't have a digit
display?" This is rather like asking
"how can you measure a piece of wood
with a metal rule?" Another question is
"why can I hear the tone even when it's
switched off?" This is a confusion
between the audible tone which the
meter makes when the signal is strong
and the ultrasonic (inaudible) 22kHz
"tone" that it uses to switch the LNB
to high band.
As you may know, a "Universal" LNB
has two internal oscillators - a
10.6GHz oscillator for "high frequency
band" and a 9.75GHz oscillator for "low
frequency band". It selects "high band"
when it receives a 22kHz tone from the
coaxial cable. In addition, it responds
to the input voltage for polarisation
selection (13 volts selects vertical
and 17 volts selects horizontal
polarisation. The changeover point is
around 14.5 to 15.5 volts so the supply
voltage must be above or below that
range for reliable switching of
polarisation). The 22kHz tone is a 0.5
volt "ripple" which is superimposed on
the 13v or 17v supply voltage.
That's the technical stuff. You
don't need to understand what it means,
provided that you understand that:
13v = vertically polarised signals
are received
17v = horizontally polarised signals
are received
22kHz = high band is received
no 22kHz = low band is received
I might as well mention that some
receivers can pulse the 22kHz on and
off very rapidly (like Morse code).
This is called DisEQc signalling and
can be used to tell some LNB switching
boxes or dish motors what to do *IF*
your receiver supports DisEQc (Sky
Digiboxes do not). This is not relevant
to the discussion but people keep
asking me!
Installing Sky Digital
TV
Companion eBook to the
above "Understanding..". Self
installation information.
Essential
reading if you want to
move your old system to a new
house, install a brand new
Sky-Plus or standard system,
fit a system to your house,
apartment block, motorhome,
caravan or narrow boat or use
it in Europe, this eBook
answers your questions. What
size dish, what sort of cable,
connectors, which receiver is
best for outside the UK, how
to align dish, How to disguise
the dish and special disguised
dishes such as the digiglobe
... 110+ page eBook
filled with colour photographs
and easy-to-understand
explanations.
I guarantee you'll be
delighted with this amazing
eBook full of information!
Sky Digital is broadcast from a
cluster of satellites positioned above
the equator at 28.2 degrees east of
south. Magnetic variation occurs and
must be added to - or subtracted from -
the actual compass reading to give the
true azimuth. So, for example, if I
used a compass here in Cheshire,
England, I would have to position the
dish east of south by 28.2 - 5 = 23.2
degrees, according to the compass.
Sky Digital is a little unusual
because, at the time of writing (
November 9, 2000 ) there is no
transmission on low band from 28.2E.
(June 2001 there is now a faint signal
as these transponders are in use). This
makes it easy to locate the satellite
cluster with the SatCure meter.
Position the dish as accurately as
possible using a compass and protractor
with plumb line (if you have nothing
better - read my book) then connect the
meter with a receiver or suitable power
supply (12 volts dc will do for now) to
provide power. Switch tone ON and align
the dish for highest reading. Switch
the tone OFF. There should now be
hardly any signal because there is only
a few transponders in use on 28.2E in
the low frequency band. In contrast, if
you try this with, say, "Hot Bird" at
13'E then the signal indication will
remain high because low band carries
lots of transmissions from this
satellite.
Once you have aligned the dish as
accurately as you can, then use the
meter to get the strongest signal by
pulling the dish up/down, left/right a
fraction. Lock it in this position,
then move the LNB backwards and
forwards in its clamp to find the best
focal point. Finally, twist the LNB to
get the highest signal and quality
readings. This is normally achieved
with the LNB body almost vertical with
the cable hanging downwards so be
sceptical if it isn't!
Remember that the parabolic dish is
really a mirror which is concentrating
the satellite signal at one point near
the end of the arm. The LNB must be
exactly at this point. (If you use our
"Alps" LNB you can adjust its focal
position for best results).
OK, you should now be able to see a
signal reading from the Digibox on the
TV screen (select the appropriate menu
by pressing Services 4 6 ) but allow
the digital receiver a minute from
power-on to translate the digital
information from the satellite
("searching for listings") before
you'll get a picture.
Finally, feed 17v or 18v into the
meter so that the LNB switches to
horizontal polarisation.
If you are using the Digibox to
power the LNB, press:-
SERVICES .. 4 .. 0 .. 1 .. SELECT ..
2
and you will see the DEFAULT
TRANSPONDER MENU that looks like
this:-
Frequency (GHz)
11.778
Polarisation
V
Symbol Rate (Mbaud) 27.5
FEC
2/3
Save New Settings
Use the Down Arrow button to move
the cursor to "Polarisation" and press
the Right Arrow button to change the
setting from V to H. Press the Down
Arrow button three times to highlight
"Save New Settings" and press
SELECT.
The LNB voltage will now be 17 volts
instead of 13 volts.
BE SURE TO SET THIS BACK TO "V" WHEN
YOU HAVE FINISHED.
Note that it may NOT be necessary to
carry out any adjustment with
horizontal polarisation and it should
NOT be done until you have a picture in
any case. If you have a good picture
and a reasonable "Quality" indication
in the on-screen menu then there's no
need to make any further adjustment. If
the quality reading is low, then
further adjustment is needed, otherwise
you could lose the picture and sound in
bad weather.
The rotational position of the LNB
determines whether it receives
horizontally or vertically polarised
signals. If it is incorrectly
positioned then it can receive BOTH at
the same time. This will cause many
problems with pictures "breaking up" so
rotate the LNB in its clamp to get the
best QUALITY reading for horizontal
(17v) then repeat it for vertical (13v)
until you have reached the best
compromise.
IMPORTANT: The meter will
reduce the signal to the receiver quite
drastically! This may be helpful in
aligning with an analogue receiver
(adjust for minimum sparklies) but a
digital receiver may give NO picture
with the meter in-line. You MUST NOT
leave the meter in line if you want
trouble-free viewing. Some
more-expensive-meter instructions state
that the meter can be left in line but,
in practice, the meter will often
continue to give an audible tone and
will inevitably degrade the signal -
just compare the "quality" reading with
the meter connected and
disconnected.
How do I know where to point my
dish?
OK, there's a calculator that makes
it easier. Click HERE
>Martin,
Just received the meter and the S.A.
tape today.
>
>I also downloaded the free book and
checked out the multiple LNB
section.
>With the advice therein, I'm pretty
sure I will be able to tune in both
>satellites. If you recall, I'll be
trying to receive Astra 19° and
Astra 28°
>from the same dish. I have an 88cm
dish which should be big enough. The
dish
>and dual LNB mount are made by
Triax. With this mount, each LNB is
slightly
>of center. The amount off-center is
adjustable. The dealer told me to
put
>each LNB on #10. I presume this
means they are set up to receive 2
different
>satellites which are 10°
apart. Please tell me if this is
correct - when
>standing behind the dish, the LNB
for Astra 19° is on the LEFT and
the LNB
>for Astra 28° is on the RIGHT.
Should the dish be theoretically aimed
at a
>point between the 2 satellites or
should I align the digital LNB first
for
>Astra 28 (since I understand it has
a weaker signal than Astra 19). Any
>suggestions would be
appreciated.
>Thanks for the good service.
>Dennis
Oh, jeez. I've never done an
installation and I failed Geography
"Oh" level (Oh)!
Standing behind the dish you are
looking South East and East is to your
left.
The dish is pointing at (28 + 19)/2
= 23.5'E of S. Bear in mind this is
*true* south so take the magnetic
variation into account. Don't just look
at the compass.
As the dish acts as a *mirror*, the
28' LNB will be on your right and the
19' LNB on your left, still standing
behind the dish. Yes, I think we
agree.
Now, get the LNBs fitted and the
dish aligned as accurately as possible.
Don't forget to subtract the "magnetic
variation" for your location, to the
compass reading. This means that 28'
probably translates to something like
23' on the actual compass.
Check the elevation for your
location. It's about 26' above the
horizon, here in Cheshire, England, but
that angle increases as you get nearer
to the equator. Remember that the
elevation gives you the position of the
satellite above the horizon and *not*
the angle of the dish arm (unless it's
a "prime focus" dish). For an offset
focus dish, the elevation angle
markings are sometimes stamped into the
bracket. If not, then you'll have to
guess.
Hi Martin,
Just thought I'd send you a short
note to let you know how we got on with
our £100 brand new Sky outfit down
in France.
Firstly, I purchased your Installing
Sky Digital book, just to get a bit
of knowledge so to speak. The thought
of paying the local satellite installer
in France £100 was off-putting to
say the least. Your book confirmed this
- it can be done with a bit of
patience. This book is truly the bible
of Sky Digital self installation. You
carefully explain the principles behind
the transmissions, what you need and
some of the technical terms which come
in very handy when chatting to the Sky
retailer.
We purchased the Sky dish and box
with a BBC Free card from a dealer in
South Wales for £100. I don't know
how it was so cheap. Didn't ask any
questions, just answered his questions.
'Which box would you prefer?' - Chose
the Panasonic TU-DSB 31 and walked out
of his shop five minutes later with a
fully authorised Sky outfit with dish
and card. He seemed quite impressed,
and I would say intimidated, that a
mere punter knew about CT100 grade
cable and self amalgamating tape
etc.
This then sat quietly in its
cardboard box for a month or so,
awaiting the trip down to the cottage
in France (Montmorillon, 45 mins south
of Poitiers). I got it out, just a few
days before the trip down, to wake the
card up, just in case.
The dish and box were fitted by my
brother and father, using the
instructions in your excellent booklet
and a borrowed compass, nothing more.
They started as you suggest by finding
the satellite on the ground, then
fitting the dish to the wall. The
signal we receive in France is better
than the signal we get here in South
Wales!! I have yet to see this as I was
tied by work to remain in the UK.
Dad was at first a bit cynical about
the booklet and the fact that I'd paid
seven pound out 'on a whim', but I
persisted and told him to read the
installation bit and how to build the
cable. He was suitably impressed, but
still came back with a cynical edge. It
wasn't until they returned home last
week, that he was fully converted. His
exact words were 'That book was a
bloody godsend!' He told friends of
ours who paid the full Sky price of
£288 for their kit, and £100
to the French installer, how much we'd
set ours up for and they were genuinely
amazed. I mean £107 for British TV
in France can't be bad. Just as a test,
dad took a bit of standard coax down
with them and ran the kit from that
during setup, and was impressed by the
difference that CT100 gives. It seems
to be a much better quality of cable,
seemingly more able to handle the
temperatures down in France.
Incidentally, on the day that they set
the system up, the temperature on the
patio was 32 degrees C, so the decision
was made to run the cable slightly up
under the roof overhang to provide some
shielding from the direct sunlight.
I would like to extend a huge thank
you to you for providing such valuable
information to those who can be
bothered to search you out. All that
info, and at such a phenomenally
reasonable price. Those who baulk at
paying the seven pounds should really
examine what £7 buys these days. A
small round of drinks or a vast
collection of knowledge probably
spanning many years and lots of
scenarios and systems
Therefore, we will whenever possible
be recommending the site and the book
to expats and holiday homers in our
region of France. Hopefully you'll get
a few more punters from this.
Martin, Thank you again, and all the
best to you and your family for the
future.
Regards and thanks again
Paul D.
Thanks
Martin,
I used the
Satellite finder this morning and it
was like magic. After 5 hours
frustration last Saturday it literally
took 10 minutes today and I am back in
communication with the English speaking
world.
Ciao
Joe
Thanks for writing, Joe.
However, I have to explain that Joe
knew what he was doing and had read all
the available information on both my
satellite web sites and in my free
book.
If you are an absolute beginner,
please don't open your parcel, pull out
the new meter and rush out into the
rain to align your dish. In fact I
recommend you don't work in the rain at
all unless you are very experienced!
Rainwater down your collar is at best
unpleasant and doesn't help you to
concentrate. Rainwater down your cable
is a disaster and you shouldn't take
the risk.
Dear
Martin,
I would like
to take this opportunity to express my
satisfaction with your Digital +
Analogue sat finder meter. It certainly
lived up to all your descriptions of it
and made us wonder if we would ever
have found the satellite properly
without it.
Eric
Thanks, Eric.
I should point out that the
satfinder won't actually "find" the
satellite for you although it will help
considerably. You have to align the
dish as best you can with the aid of a
compass, home-made sextant and anything
else you have. The meter will assist
you with the final, accurate alignment
that is so essential to guarantee
continued viewing in bad weather.
Dear
Martin,
I recently purchased a digital meter
from you. All I can say is that I wish
I had made the purchase a long time
ago. I have previously spent hours in
the rain and snow adjusting the dish.
With the Satfinder meter it took me 10
minutes (in the sunshine of course) to
get near 100% signal strength and
quality.
M
Hadley
Dear Martin,
Just thought I would let you know how I
got on with the Satfinder, recently
received. Verdict ? Fantastic. Both
LNB's on my dual feed antenna focussed
in forty minutes, and not a residual
sparkly in sight. Easily beats the
previous total of around five hours
without it on three earlier occasions,
running up and down the ladder to view
the picture each time I made an
adjustment. Mind you, that exercise was
not in vain- (I think) it did my heart
good, and I've now got calf muscles as
big as the bum on a shirehorse
!!
It was so
quick to use that I felt like
disturbing all the settings afterwards
just to do it again, and to get my
moneys worth twice over. Thanks. In
fact if I am divorced then you will be
to blame !!! Fired with more enthusiasm
I have now bought a digital receiver -
a budget Skymaster DXL 9100 - bought on
the spur of the mo. (and presently
hidden from my wife until her mood is
right and until I can install it in an
existing cabinet- she doesn't
understand why I take an interest in
watching progs from Dubai and such
places).
Tony
Stevenson
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