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'[ot]: building a pic based DSS signal monitor??'
2002\06\04@162819 by rad0

picon face
Hello,

I am looking at the inexpensive signal meters for the DSS satellite systems,

and I was wondering how they work exactly?  It looks like they are
placed in line, is this how they are powered?  (I guess this is how the
LNB is powered),  'but'   if so, can you still 'practically'
watch the television when there is an inline monitor?

I want to build a self aiming satellite dish, and I thought I could use a
quick
calculation for the initial aim, based on lat/lon; then used the signal
strength
to tweak to max signal.

questions:

first
Does anyone know of a homebrew design for these inexpensive signal monitors?

second
What do you think of my recipe for aiming the little dish, lat/lon calc then
tweak using
signal strength?

Thanks

This project would combine all the talents of the pic, using it to calc,
monitor a signal,
then move motors...not a bad days/minutes work for the little thing

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2002\06\04@171023 by Rick C.

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face
Channel Master makes a little box that goes inline for about $39.00. It's just a
through put with a tap that powers (from the receiver) a simple RF amp/det that
drives a meter and piezo device. It will not degrade your receive performance.

To answer your second question, it's possible but not that practical unless you
want to do it for the sake of saying you did it. You'd have to accurately know
your azimuth (flux gate compass), lat/lon with GPS, calculate in your magnetic
variance, lash it together with a few servos, write a program to sense and aim,
hoping to get the right satellite, hope you have a clear shot at the bird, and
maybe it will work. Or, just buy one that does just that, for about $800.

http://www.accessorywarehouse.com/index.html  click on Satellite TV and
Accessories for a reference.
Rick

rad0 wrote:

{Quote hidden}

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2002\06\04@175612 by rad0

picon face
Thanks

> Channel Master makes a little box that goes inline for about $39.00. It's
just a
> through put with a tap that powers (from the receiver) a simple RF amp/det
that
> drives a meter and piezo device. It will not degrade your receive
performance.
>
> To answer your second question, it's possible but not that practical
unless you
> want to do it for the sake of saying you did it. You'd have to accurately
know
> your azimuth (flux gate compass), lat/lon with GPS, calculate in your
magnetic
> variance, lash it together with a few servos, write a program to sense and
aim,
> hoping to get the right satellite, hope you have a clear shot at the bird,
and
> maybe it will work. Or, just buy one that does just that, for about $800.
>
I didn't know you could buy them for $800, but anyway, I've never really
been able
to do anything cheaper or better than Mr Market, so I guess it is just so I
could say
'I did it' ... this is a hobby for me

accurately knowing your azimuth, this I'm not sure how to calculate...but
can not everything
be calculated with the data from a gps??  it gives heading, not sure if it
is mag heading though

And aren't the satellites directing over the equator?  or close enough for
aiming purposes??


Thanks again

Altitude is the angle up from the horizon. Zero degrees altitude means
exactly on your local horizon, and
90 degrees is "straight up". Hence, "directly underfoot" is -90 degrees
altitude. Azimuth is the angle along
the horizon, with zero degrees corresponding to North, and increasing in a
clockwise fashion. Thus, 90
degrees is East, 180 degrees is South, and 270 degrees is West. Using these
two angles, one can describe
the apparent position of an object (such as the Sun at a given time).

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2002\06\04@183150 by Rick C.

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The azimuth from a GPS is only accurate when in motion. You can program the GPS
for true north or magnetic. Yes, the geo-sync birds are in the Clarke belt (over
the equator). It's not that easy to spot the bird. A couple degrees off and no
lock. Close (enough)......only counts in horseshoes, hand gernades, and atom
bombs. ;-)
Rick

rad0 wrote:

{Quote hidden}

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2002\06\05@164043 by Peter L. Peres

picon face
>accurately knowing your azimuth, this I'm not sure how to calculate...but
>can not everything be calculated with the data from a gps??  it gives
>heading, not sure if it is mag heading though

It's not, it's the heading you want (geographical referenced to one of
the standard survey datum terroids).

>And aren't the satellites directing over the equator?  or close enough for
>aiming purposes??

Yes, but they are way UP above it so you need to solve a 3D triangle to
get it right.

Unless you will be making really big dishes the initial pointing accuracy
will need to be only +/- 1 degree. In astronomical and navigational terms
this is very very lax. There are online tables of az/el/phi settings for
most satellites. (phi is the angle vs. local vertical for the V
polarization channels from the satellite). So if you store a table and
point the system to within 0.5 degrees at installation then your trick
should work imho. You could even hack a commercial DSS signal meter to
give an analog signal you can use in your microprocessor.

Peter

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