What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It
needs power but the only manual I can find says it uses the same
voltage as the dish, and doesn't say how much the dish uses.


Thanks for any help on all my questions.

P. S. I also took off the center part, the receiver or whatever, and
sold it for a dollar or two at a hamfest. They sell new for 50
dollars but tha's okay.

On Fri, 17 Jul 2009 18:27:05 -0400, mm
wrote:

What voltage is meant to be used by 18 inch satellite dishes?
AC or DC?

DC. For simple LNB's, 13V for left hand circular polarization. 18V
for right hand. That corresponds to the odd channels and the even
channels (or the reverse in case I got it backwards). If you're using
a DiSEqC switch, there's also a 22KHz control tone to switch outputs.
Life gets really complexicated if you have a 5 LNB dish.

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It
needs power but the only manual I can find says it uses the same
voltage as the dish, and doesn't say how much the dish uses.

Ugh. I don't know how the VHF/UHF antenna is switched.

Thanks for any help on all my questions.

P. S. I also took off the center part, the receiver or whatever, and
sold it for a dollar or two at a hamfest. They sell new for 50
dollars but tha's okay.

You can also build a wi-fi range extender with the dish:
http://www.findmorecollectibles.com/wifi.html
http://www.engadget.com/2005/11/15/how-to-build-a-wifi-biquad-dish-antenna/
http://www.qsl.net/ki7cx/wgfeed.htm
http://www.weijand.nl/wifi/

"Jeff Liebermann" wrote in message
...
On Fri, 17 Jul 2009 18:27:05 -0400, mm
wrote:

What voltage is meant to be used by 18 inch satellite dishes?
AC or DC?

DC. For simple LNB's, 13V for left hand circular polarization. 18V
for right hand. That corresponds to the odd channels and the even
channels (or the reverse in case I got it backwards). If you're using
a DiSEqC switch, there's also a 22KHz control tone to switch outputs.
Life gets really complexicated if you have a 5 LNB dish.

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It
needs power but the only manual I can find says it uses the same
voltage as the dish, and doesn't say how much the dish uses.

Ugh. I don't know how the VHF/UHF antenna is switched.

Thanks for any help on all my questions.

P. S. I also took off the center part, the receiver or whatever, and
sold it for a dollar or two at a hamfest. They sell new for 50
dollars but tha's okay.

You can also build a wi-fi range extender with the dish:
http://www.findmorecollectibles.com/wifi.html
http://www.engadget.com/2005/11/15/how-to-build-a-wifi-biquad-dish-antenna/
http://www.qsl.net/ki7cx/wgfeed.htm
http://www.weijand.nl/wifi/


Circular polarisation for US DBS, Jeff ? Over this side of the pond, it's
vertical and horizontal polarisation for alternate channels or whatever, but
with the same selection / LNB powering voltages, and additional switching by
22kHz tone, the same.

Arfa

On Sat, 18 Jul 2009 09:54:43 +0100, "Arfa Daily"
wrote:

Circular polarisation for US DBS, Jeff ? Over this side of the pond, it's
vertical and horizontal polarisation for alternate channels or whatever, but
with the same selection / LNB powering voltages, and additional switching by
22kHz tone, the same.

DirecTV and Dish are both circular polarization.
HughesNet internet is linear (vertical or horizontal) polarization.
FTA (free to air) transmissions are all linear polarization.
Broadcast downlinks (FSS) are all linear polarization.

http://en.wikipedia.org/wiki/Low-noise_block_converter
"Most North American DBS signals use circular polarization, instead of
linear polarization, therefore requiring a different LNB type for
proper reception. In this case, the polarization must be adjusted
between clockwise and counterclockwise, rather than horizontal and
vertical."

This explains it in detail:
http://www.abadss.com/forum/102-faq-how/5880-understand-lnbs-standard-linear-circular-universal-lnb-lnbf-stacked.html



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

"Jeff Liebermann" wrote in message
...
On Sat, 18 Jul 2009 09:54:43 +0100, "Arfa Daily"
wrote:

Circular polarisation for US DBS, Jeff ? Over this side of the pond, it's
vertical and horizontal polarisation for alternate channels or whatever,
but
with the same selection / LNB powering voltages, and additional switching
by
22kHz tone, the same.

DirecTV and Dish are both circular polarization.
HughesNet internet is linear (vertical or horizontal) polarization.
FTA (free to air) transmissions are all linear polarization.
Broadcast downlinks (FSS) are all linear polarization.

http://en.wikipedia.org/wiki/Low-noise_block_converter
"Most North American DBS signals use circular polarization, instead of
linear polarization, therefore requiring a different LNB type for
proper reception. In this case, the polarization must be adjusted
between clockwise and counterclockwise, rather than horizontal and
vertical."

This explains it in detail:
http://www.abadss.com/forum/102-faq-how/5880-understand-lnbs-standard-linear-circular-universal-lnb-lnbf-stacked.html



That's interesting. I wonder what the perceived advantage of using circular
over linear polarisation is ? I can see that polarisation twist from passage
of the signal through the atmosphere would be eliminated, and also skew
caused by your E-W position with respect to the bird. Do you think that's
the reason ? I didn't realise that a c.p, LNB was effectively just an l.p
LNB with a signal 'de-spinner' (lump of ferrite ?) in the feed. As long as
DBS has been going in Europe, which is quite a lot of years now if you go
back to the old analogue birds, c.p. has never been used, which is why I'm
not too familiar with it as applied to microwave signals.

Many of the LNBs here are now multis to allow use of receivers with dual
independant tuners, and the multi-room service which allows two dual tuner
receivers to be connected to the same dish. Do you have multis like this
that still work with c,p, ?

Arfa

Arfa Daily wrote:


"Jeff Liebermann" wrote in message
...
On Sat, 18 Jul 2009 09:54:43 +0100, "Arfa Daily"
wrote:

Circular polarisation for US DBS, Jeff ? Over this side of the pond, it's
vertical and horizontal polarisation for alternate channels or whatever,
but
with the same selection / LNB powering voltages, and additional switching
by
22kHz tone, the same.

DirecTV and Dish are both circular polarization.
HughesNet internet is linear (vertical or horizontal) polarization.
FTA (free to air) transmissions are all linear polarization.
Broadcast downlinks (FSS) are all linear polarization.

http://en.wikipedia.org/wiki/Low-noise_block_converter
"Most North American DBS signals use circular polarization, instead of
linear polarization, therefore requiring a different LNB type for
proper reception. In this case, the polarization must be adjusted
between clockwise and counterclockwise, rather than horizontal and
vertical."

This explains it in detail:

http://www.abadss.com/forum/102-faq-how/5880-understand-lnbs-standard-linear-circular-universal-lnb-lnbf-stacked.html



That's interesting. I wonder what the perceived advantage of using
circular over linear polarisation is ? I can see that polarisation twist
from passage of the signal through the atmosphere would be eliminated, and
also skew caused by your E-W position with respect to the bird. Do you
think that's the reason ? I didn't realise that a c.p, LNB was effectively
just an l.p LNB with a signal 'de-spinner' (lump of ferrite ?) in the
feed. As long as DBS has been going in Europe, which is quite a lot of
years now if you go back to the old analogue birds, c.p. has never been
used, which is why I'm not too familiar with it as applied to microwave
signals.

Not completely true - the UK's old BSB satellite service used circular
plolarisation (quoted as right hand circular which I'm assuming means
clockwise) until the system was killed off by SKY's dodgy dealings - they
persuaded the UK government that BSB would need 2 satellites so there would
be a backup and that they'd need to use the more expensive D-MAC standard
to get good enough picture quality.

The result being it cost a fortune to get new box hardware designed and put
2 satellites up just to broadcast 5 channels (which couldn't be expanded
without launching another 2 satellites) when at the same time SKY were
exempt from UK satellite broadcast restrictions due to uplinking from
Luxembourg and were allowed to rent space on an Astra satellite with space
for 16 channels and using cheaper PAL receivers that were already designed
and available.

When BSB closed down (after only 6 months of broadcasting) the 2 satellites
were sold to Scandinavian broadcasters who switched to D2-MAC and used them
until 2003.

On Fri, 17 Jul 2009 22:03:07 -0700, Jeff Liebermann
wrote:

On Fri, 17 Jul 2009 18:27:05 -0400, mm
wrote:

What voltage is meant to be used by 18 inch satellite dishes?
AC or DC?

DC. For simple LNB's, 13V for left hand circular polarization. 18V
for right hand.

Wow. That's amazing.

Thanks to everyone. I should be able to get this working, plus I have
3 amplified antennas in my attic. One or two of them are broken, but I
think I have enough for myself and a friend and his landlady, both of
whom have had very little tv since digital.

BTW, I remember now I sold that thing in the center of the dish for
one or two dollars BEFORE I saw it for sale at Radio Shack for 50
dollars, but that's still okay.



That corresponds to the odd channels and the even
channels (or the reverse in case I got it backwards). If you're using
a DiSEqC switch, there's also a 22KHz control tone to switch outputs.
Life gets really complexicated if you have a 5 LNB dish.

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It
needs power but the only manual I can find says it uses the same
voltage as the dish, and doesn't say how much the dish uses.

Ugh. I don't know how the VHF/UHF antenna is switched.

Thanks for any help on all my questions.

P. S. I also took off the center part, the receiver or whatever, and
sold it for a dollar or two at a hamfest. They sell new for 50
dollars but tha's okay.

You can also build a wi-fi range extender with the dish:
http://www.findmorecollectibles.com/wifi.html
http://www.engadget.com/2005/11/15/how-to-build-a-wifi-biquad-dish-antenna/
http://www.qsl.net/ki7cx/wgfeed.htm
http://www.weijand.nl/wifi/

On Fri, 17 Jul 2009 18:27:05 -0400, mm wrote:
What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It

Dishes are passive devices; they are not powered by anything but incoming RF
energy.

A good start would be to learn the difference between a dish,
LNB, and receiver.

On Sat, 18 Jul 2009 17:58:10 -0500, AZ Nomad
wrote:

On Fri, 17 Jul 2009 18:27:05 -0400, mm wrote:
What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It

Dishes are passive devices; they are not powered by anything but incoming RF
energy.

Items sold as dishes include amplifers.

A good start would be to learn the difference between a dish,
LNB, and receiver.

A good start on what?

I'm not really interested in an electronics lesson. I just want to
know what voltage would power the amplifier on the VHF/UHF antenna
that surrounds the dish. The manual says it uses the same voltage
that dish does, or something like that. Maybe you can write the
manual's author.

I'll go with one of the helpful answers.

mm wrote:

On Sat, 18 Jul 2009 17:58:10 -0500, AZ Nomad
wrote:

On Fri, 17 Jul 2009 18:27:05 -0400, mm wrote:
What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It

Dishes are passive devices; they are not powered by anything but incoming RF
energy.

Items sold as dishes include amplifers.

A good start would be to learn the difference between a dish,
LNB, and receiver.

A good start on what?

I'm not really interested in an electronics lesson. I just want to
know what voltage would power the amplifier on the VHF/UHF antenna
that surrounds the dish. The manual says it uses the same voltage
that dish does, or something like that. Maybe you can write the
manual's author.

I'll go with one of the helpful answers.


Why don't you just go away? You gave no brand or model number, or
anything else that would let anyone help you.


--
You can't have a sense of humor, if you have no sense!

"mm" wrote in message
...
On Sat, 18 Jul 2009 17:58:10 -0500, AZ Nomad
wrote:

On Fri, 17 Jul 2009 18:27:05 -0400, mm wrote:
What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It

Dishes are passive devices; they are not powered by anything but incoming
RF
energy.

Items sold as dishes include amplifers.

A good start would be to learn the difference between a dish,
LNB, and receiver.

A good start on what?

I'm not really interested in an electronics lesson. I just want to
know what voltage would power the amplifier on the VHF/UHF antenna
that surrounds the dish. The manual says it uses the same voltage
that dish does, or something like that. Maybe you can write the
manual's author.

I'll go with one of the helpful answers.

In order to get helpful answers, you first need to have a little respect for
the people who are trying to guide you. Your question doesn't even relate to
any kind of "repair" - read the name of the group, so you are doing well to
elicit any kind of sensible responses at all. If you are not interested in
learning in order to help yourself to arrive at answers, why should we waste
our time doing your research for you ? I would suggest that you try 110v AC
"or something like that". If it works, you won't need to ask any more, and
if it doesn't, you may learn a valuable lesson in both electronics, and life
....

Arfa

On Sun, 19 Jul 2009 15:49:48 +0100, "Arfa Daily"
wrote:


"mm" wrote in message
.. .
On Sat, 18 Jul 2009 17:58:10 -0500, AZ Nomad
wrote:

On Fri, 17 Jul 2009 18:27:05 -0400, mm wrote:
What voltage is meant to be used by 18 inch satellite dishes?

AC or DC?

I found a satellite antenna in the trash, and I dont have satellite,
but I saved the clip-on VHF/UHF antenna that goes around the edge. It

Dishes are passive devices; they are not powered by anything but incoming
RF
energy.

Items sold as dishes include amplifers.

A good start would be to learn the difference between a dish,
LNB, and receiver.

A good start on what?

I'm not really interested in an electronics lesson. I just want to
know what voltage would power the amplifier on the VHF/UHF antenna
that surrounds the dish. The manual says it uses the same voltage
that dish does, or something like that. Maybe you can write the
manual's author.

I'll go with one of the helpful answers.

In order to get helpful answers, you first need to have a little respect for
the people who are trying to guide you.

I have great respect for and gratitude to the people who are trying to
help or guide me. I don't believe the previous poster was.

OTOH, two posters gave me helpful answers. One was simple, and much of
the other was above me, but it was still quite helpful. Thank you,
both.

Your question doesn't even relate to
any kind of "repair" - read the name of the group, so you are doing well to
elicit any kind of sensible responses at all. If you are not interested in
learning in order to help yourself to arrive at answers, why should we waste
our time doing your research for you ? I would suggest that you try 110v AC
"or something like that".

I don't remember how the manual phrased it, but it said it used the
OTA antenna, that is the amplifier, used the same voltage as the dish,
an 18 inch dish used either for Dish network or Direct TV, probably
the first one.

If it works, you won't need to ask any more, and
if it doesn't, you may learn a valuable lesson in both electronics, and life

I already know that lesson, and I didn't have to burn anything out to
learn it.
...

Arfa

On Mon, 20 Jul 2009 10:12:58 -0400, Meat Plow
wrote:

On Sun, 19 Jul 2009 22:12:45 -0400, mm
wrote:


I already know that lesson, and I didn't have to burn anything out to
learn it.

Your free antenna was designed to use the Sat feedline to not only
power it but to also transfer the broadcast signal to either a Multi
Switch with an antenna output or a splitter provided by the antenna
manufacturer. My old Multi Switch had an antenna output IIRC. This
would block standard brodcast frequencies with the downlink, control
signals and voltages from your set.

If you just have the antenna itself and nothing else you may not have
enough of it to work. What brand/model is it?

It's a Terk, but I can't find a model number. There's a ragged piece
of paper glued to it that might have been a label.

It has a circular plastic box in the middle with 4 coaxial connectors,
marked 1, 2, 4, and 4. The first two are also marked IN and the
second two are marked OUT.

On Mon, 20 Jul 2009 10:12:58 -0400, Meat Plow
wrote:


If you just have the antenna itself and nothing else you may not have
enough of it to work.

It turns out you're right on. And thank you for posting the .jpg
file for the TV-42 in another post.

To make a long story short, I found printed matter, a manual for the
44 and sort of an ad for the 42 clip-on and neither gave a voltage,
but one gave a phone number to call for Terk, so I did, and they
didn't keep me waiting more than a minute or two, and the technician
said my thing, the TV-42 you found the picture of, won't work without
a dish. Just like you suspected.

I asked him if there was a way around it and he seemed truly sorry to
tell me no. So I guess there isn't. But now that I've had 4 hours
to think about it, I don't understand why not.

I re-ordered your post:
Your free antenna was designed to use the Sat feedline to not only
power it

Okay

but to also transfer the broadcast signal to either a Multi
Switch with an antenna output or a splitter provided by the antenna
manufacturer.

A multi-switch with an antenna output? Can't I just use one or the
other of the two connectors labeled Output, and connect that to a
digital tv or a digital converter box?

Does the power for the amp come in through one of the Input
connectors? If so, I could run a second co-ax line to power the amp.

In addition to the TV-44 and TV-42, I found the HD-TVo, (which is a
stand-alone antenna, that looks like the other two but it has a
sword-like or Xmas-tree-like looking thing in the center. )
http://www.audiovox.com/webapp/wcs/s...4170&langId=-1

I downloaded the manual twice. Both copies kept crashing Adobe Reader
9, but I was able instead to display it in a browser window, using PDF
Download, a Firefox Add-on.

The HD-TVo comes with a "Power Injector with 110v AC to DC power
adapter"; but it doesn't say what the DC voltage is. That's when I
decided to call Terk. He said 12 volts, center pin positive, which was
in the range you gave. But then I asked about the TV-42, and he said
it won't work alone.


BTW, somewhere I came across instructions for the whole dish including
the power supply, and just like you said, Jeff, it was 13v for one
half and 18v for the other half. That's so strange to me, but please
don't anyone waste his time trying to explain it to me.

My old Multi Switch had an antenna output IIRC. This
would block standard brodcast frequencies with the downlink, control
signals and voltages from your set.

My tv set? If I'm not using, don't need a Multi Switch, would there
be anything to block the standard broadcast frequencies?

I could spend 80 dollars and buy a new one, complete with a bracket
and a power supply and that thing they call the power injector**, but
that's not the point. I love trying to make things work.

**I think I have an old power injector, but I suppose I can make one
if I have to.

What brand/model is it?

Terk TV-42. There is also a TV-44 but it has 4 pairs of In and
Out coax connectors.


Thanks a lot.