Multiswitch innards?

What the heck is in a multiswitch. I asked for advice on expanding my
system a few weeks ago, and I got good advice which I am acting on. I
was told, correctly so, that both of my LNBs would have to be
connected to the multiswitch.

Being a curious sort, I tested my switch by connecting the cable from
one LNB to the multiswitch and then connecting two receivers. Both
TVs worked, but as those amoung you who are knowledgeable in this area
already know, both TVs were missing some channels. When I connected
the other LNB to the switch, all of the channels were available.

This is what baffles me. If each LNB currently goes to a single
receiver and both TVs have all of the channels what happens when add a
multiswitch to prevent one LNB connection from providing all of the
channels to the receiver(s) that is is connected to? What am I
missing? Thanks.
Rich Russell

RNR wrote:
This is what baffles me. If each LNB currently goes to a single
receiver and both TVs have all of the channels what happens when add a
multiswitch to prevent one LNB connection from providing all of the
channels to the receiver(s) that is is connected to? What am I
missing? Thanks.

One LNB is configured to pick up clockwise-polarized signals and one LNB
is configured to pick up counter-polarized signals. The multiswitch
detects what sort of polarization the receiver is requesting and
switches the inputs to match. If both (all) receivers all request the
same polarization then they both (all) get fed from the same LNB.

--
Stephen Harris

The truth is the truth, and opinion just opinion. But what is what?
My employer pays to ignore my opinions; you get to do it for free.

On Mon, 25 Apr 2005 14:39:48 -0400, RNR
wrote:

What the heck is in a multiswitch. I asked for advice on expanding my
system a few weeks ago, and I got good advice which I am acting on. I
was told, correctly so, that both of my LNBs would have to be
connected to the multiswitch.

Being a curious sort, I tested my switch by connecting the cable from
one LNB to the multiswitch and then connecting two receivers. Both
TVs worked, but as those amoung you who are knowledgeable in this area
already know, both TVs were missing some channels. When I connected
the other LNB to the switch, all of the channels were available.

This is what baffles me. If each LNB currently goes to a single
receiver and both TVs have all of the channels what happens when add a
multiswitch to prevent one LNB connection from providing all of the
channels to the receiver(s) that is is connected to? What am I
missing? Thanks.
Rich Russell

Polarization maybe?
Charlie Hoffpauir
http://freepages.genealogy.rootsweb.com/~charlieh/

joeturn Dec 25 2003, 7:59 am show options
MERRY CHRISTMAS
Lets iron the wrinkles out of this!
A multi switch is nothing more than a glorified diplexor one that
combines the diferent tones then seperates them in the same circuit.



All sells redoric from DAVE DSS Transponders transmits microwaves
both vetically and linear but cant seperate them. As one

polarity fades the other increases.Thus mantaining an average
signal,Dave calls this unseperable phanomenon "circular".Your dish
recieves both polarities the strongest of which
prevails. The odd and even channels do not have a specific polarity

they have both .There is a seperation of channels via the ird
voltage.This is where all the confusion comes from plus the fact
that
multiple voltages being combined from multiple IRDs overwhelms the
signal.Each IRD sends approximately 16 volts to the LNB to enable
it
to block the low noise.Hince multiple voltages have an unwelcomed
effect on not only reception but over heats the LNB plus the other
IRDs inline. Since current favors the paths of least resistance
Multi
switches have been credited for disapating the excessive
voltage.However a ground at each IRD is more effective! JOE TURN


POLARITY IS STILL IN THE BUSH!!Great news !!I was led to believe that
it had to be a narrower coned
Lnb as it might be picking up splater off the othe two birds!! But as
usual this was most likely a marketing ploy to sell the sat-c kits!!
remember the piggyback and the #1 pin bend and the bogus readings on
the Phoenix Mode Well heres a new one for you remember how every one
is saying that the old splitters for RG59 want work on the sat system
because of (possible)voltage damage and or channel lost which after
two years of the use of this splitter I still have no problem???? Now
theres a new one cost $5.00 now because it has a diode in it!He he
he What about the dual lnb??He he he(The word dual allows double the
charge$$ When in actuality it is a simple splitter mounter onboard a
single LNB that cost twice as much$$$$) Think theres a diode between
the two out puts?$?$?$ Notta !! Look familiar?? A picture is worth a
thousand words!! http://www.lashen.com/vendors/=ADjvi/hfs-x2dn.asp All
that voltage chatter is more bs .AC current is supplied to the lnb by
the IRD for RF signal amplification, a diode would prevent the RF
signal from reaching the [email protected]#$%^& Same as Radiation would prevent a
living being's survival of a trip to the moon!! all smoke and mirrors
My rule of thumb is 1 LNB per satelite(not per IRD)So why run so
many coaxs when one would be sufficient$$$Which brings me to the
Diplexor only necessary to combine & separate antenna's impediance
from the satalite's [email protected]#$%^ lots cheaper to run another coax
and omit that device altogeather!!!!!
Also ignor those left and right hand polarity sells pitches no such a
thing polarity is not in either hand it's still in the bush @#$%^&
Post a follow-up to this message


joeturn Dec 25 2003, 4:25 pm show options

Newsgroups: alt.dss
From: (joeturn) - Find messages by this author
Date: 25 Dec 2003 16:25:13 -0800
Local: Thurs,Dec 25 2003 4:25 pm
Subject: Using a single lnb with a multiswitch
Reply to Author | Forward | Print | Individual Message | Show original
| Remove | Report Abuse



- Hide quoted text -
- Show quoted text -

(joeturn) wrote in message
. com...
(Dave Platt) wrote in message
...
In article m,
joeturn wrote:

Lets iron the wrinkles out of this!


Sure - but let's do it *CORRECTLY*, OK?


A multi switch is nothing more
than a glorified diplexor one that combines the diferent tones
then
seperates them in the same circuit.A single lnb will pick up all
the
dss sats but cant seperate them the older irds can view which ever
sat
it is tuned to,but can only view one per pointing.


*sigh*.



SNIP edited by Joe



- Hide quoted text -
- Show quoted text -

All sells redoric from DAVE DSS Transponders transmits microwaves
both vetically and linear but cant seperate them as could the FTA
systems. As one
polarity fades the other increases.Thus mantaining an average
signal,Dave calls this unseperable phenomenon "circular
polarity".Your dish recieves both polarities the strongest of which
prevails. The odd and even channels do not have a specific
polarity
they have both .There is a seperation of channels via the ird
voltage ,this voltage is supplied to seperate or combine the
different tones produced by individual satellites .This is where all
the confusion comes from plus the fact that
multiple voltages being combined from multiple IRDs overwhelms
the
signal.Each IRD sends approximately 16 volts to the LNB to enable
it
to block the low noise.Hince multiple voltages have an unwelcomed

effect on not only reception but over heats the LNB plus the
other
IRDs inline. Since current favors the paths of least resistance
Multi
switches have been credited for disapating the excessive
voltage.However a ground at each IRD is more effective! JOE TURN
POLARITY IS STILL IN THE BUSH!!Great news !!I was led to believe that

it had to be a narrower coned
Lnb as it might be picking up splater off the othe two birds!! But as

usual this was most likely a marketing ploy to sell the sat-c kits!!
remember the piggyback and the #1 pin bend and the bogus readings on
the Phoenix Mode Well heres a new one for you remember how every
one
is saying that the old splitters for RG59 want work on the sat system

because of (possible)voltage damage and or channel lost which after

two years of the use of this splitter I still have no problem???? Now

theres a new one cost $5.00 now because it has a diode in it!He he
he What about the dual lnb??He he he(The word dual allows double
the
charge$$ When in actuality it is a simple splitter mounted onboard a
single LNB that cost twice as much$$$$) Think theres a diode between
the two out puts?$?$?$ Notta !! Look familiar?? A picture is worth a
thousand words!! http://www.lashen.com/vendors/=ADjvi/hfs-x2dn.asp All

that voltage chatter is more bs .AC current is supplied to the lnb by

the IRD for RF signal amplification, a diode would prevent the RF
signal from reaching the [email protected]#$%^& Same as Radiation would prevent a
living being's survival of a trip to the moon!! all smoke and mirrors

My rule of thumb is 1 LNB per satelite(not per IRD)So why run so
many coaxs when one would be sufficient$$$Which brings me to the
Diplexor only necessary to combine & separate antenna's impediance
from the satalite's [email protected]#$%^ lots cheaper to run another coax
and omit that device altogeather!!!!!
Also ignor those left and right hand polarity sells pitches no such a

thing polarity is not in either hand it's still in the bush @#$%^&
Post a follow-up to this message


Poeple believe the most stuppid things:
Example Paul Reveres Ride took place but the British took his horse
away from him a sent him to walking home ! They were already here and
had to come by sea! They gave him his horse back after promising to
never again get drunk and ride a horse at night "animal cruelty"?

RNR wrote:
Being a curious sort, I tested my switch by connecting the cable from
one LNB to the multiswitch and then connecting two receivers. Both
TVs worked, but as those amoung you who are knowledgeable in this area
already know, both TVs were missing some channels. When I connected
the other LNB to the switch, all of the channels were available.

The LNB will react to 13v or 18v to select odd or even transponders.

If you use some simple splitter to send the signal from a single LNB to two
receivers, it might work, as long as both receivers are on even channels,
or both are on odd channels.

The multiswitch will usually put 13v on one LNB port, and 18v on the other
LNB port, if inputs to the multiswitch are providing both voltages.

With only one LNB connected to the multiswitch, you might only be able to
select odd channels, or even channels. You didn't say which channels were
missing. If you connected only the other LNB, you might get the
opposite set of channels. If you had some mix of even and odd, it must
depend on which voltage the other receiver is sending.

The multiswitch will pass the signals from an appropriate LNB to all of the
receivers requesting that signal, when it is correctly connected. One
receiver doesn't control each LNB, or you wouldn't be able to get four
outputs.


---
Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5

RNR wrote:
What the heck is in a multiswitch. I asked for advice on expanding my
system a few weeks ago, and I got good advice which I am acting on. I
was told, correctly so, that both of my LNBs would have to be
connected to the multiswitch.

Being a curious sort, I tested my switch by connecting the cable from
one LNB to the multiswitch and then connecting two receivers. Both
TVs worked, but as those amoung you who are knowledgeable in this area
already know, both TVs were missing some channels. When I connected
the other LNB to the switch, all of the channels were available.

This is what baffles me. If each LNB currently goes to a single
receiver and both TVs have all of the channels what happens when add a
multiswitch to prevent one LNB connection from providing all of the
channels to the receiver(s) that is is connected to? What am I
missing? Thanks.
Rich Russell

A regular LNBF has a switch built into it which will send down either
the even or odd polarization frequencies. The receiver requests which
by putting either 13V or 18V on the coax that attaches to the LNBF.
This voltage also happens to power the LNBF.

When you add a multiswitch, it takes over the 13V/18V switching, and
it requires 2 connections to the LNBF in order to provide the odd and
even polarization frequencies to it. The multiswitch puts out 13V on
one of the LNBF ports and 18V on the other. So the LNBF no longer
really does any switching in this case, and if you have only one LNBF
port connected, you're going to be missing channels.

On Mon, 25 Apr 2005 19:54:32 -0700, Zoyburg wrote:

RNR wrote:
What the heck is in a multiswitch. I asked for advice on expanding my
system a few weeks ago, and I got good advice which I am acting on. I
was told, correctly so, that both of my LNBs would have to be
connected to the multiswitch.

Being a curious sort, I tested my switch by connecting the cable from
one LNB to the multiswitch and then connecting two receivers. Both
TVs worked, but as those amoung you who are knowledgeable in this area
already know, both TVs were missing some channels. When I connected
the other LNB to the switch, all of the channels were available.

This is what baffles me. If each LNB currently goes to a single
receiver and both TVs have all of the channels what happens when add a
multiswitch to prevent one LNB connection from providing all of the
channels to the receiver(s) that is is connected to? What am I
missing? Thanks.
Rich Russell

A regular LNBF has a switch built into it which will send down either
the even or odd polarization frequencies. The receiver requests which
by putting either 13V or 18V on the coax that attaches to the LNBF.
This voltage also happens to power the LNBF.

When you add a multiswitch, it takes over the 13V/18V switching, and
it requires 2 connections to the LNBF in order to provide the odd and
even polarization frequencies to it. The multiswitch puts out 13V on
one of the LNBF ports and 18V on the other. So the LNBF no longer
really does any switching in this case, and if you have only one LNBF
port connected, you're going to be missing channels.

Thanks to all. I think I've got it!
Rich Russell

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Tongue & Groove case offers excellent EMI/RFI shielding -100dB.
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F-ports are 1" on center to accommodate security tools.
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Input
(dB)
Return
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Output
(dB)

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PCB design for best performance.
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All "F" ports with protective weather cap
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(dB)
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(dB)
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