Any way to amplify upstream signal?
Perry
voltages to the multi-switch. The satellite signal from the multi-switch to
the receiver is going through fine, however the receiver is unable to change
the polarity at the multi-switch. The receiver is getting a signal from
either even transponders or odd transponders, but not both at the same time
(it receives a signal on either odd or even transponders based upon the
setting of the multi-switch port at the time the receiver is connected to
it). I have tested with different multi-switches, different receivers,
different wires connecting the components and replaced the connectors on
both ends of the wire so the problem has to be with the wire going to the
unit. The wire is approximately 75 feet long and wires of similar length
going to other units and connected to the same multi-switch are working OK.
The only thing I can figure out is that some part of the wire has increased
resistance to the point the lower switching voltage cannot make it upstream
while the stronger satellite signal can make it downstream. The wire is
installed internally in a high rise condominium so replacing the wire is not
an easy option. There is only one wire going to the unit. Any solutions?
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Rich C
Using an ohm meter measure resistance from center wire to the connector
shell.
It should be open. If not, try reterminating the connectors at BOTH ends.
Retest. If still not open you have a device inline or the cable was pinched
or a staple was driven into the cable. (A common problem) If this is the
case
there is not much you can do.
> Snipped......
ElecConnec
<public...@uswest.net> writes:
>I have a wire that is not successfully transmitting the polarity selecting
>voltages to the multi-switch. The satellite signal from the multi-switch to
>the receiver is going through fine, however the receiver is unable to change
>the polarity at the multi-switch.
Have you actually tested the voltage of the wire at the switch? I'm betting
it's "zero" and the voltage from the receiver is being blocked somehow.
(Broken ground in cable [unlikely], somebody put a splitter in line somewhere,
you crimped the new ends on badly, etc.) With no voltage going to the switch,
it's probably either stuck in the last selected position or is actually just
passing whatever signal is selected by the port NEXT to it.
Unless it's a bad connector or a splitter in-line, you don't have much of an
option besides cable replacement. (Not unless we want to dredge up that
ridiculous "add a few flashlight batteries in series" thread again!) ;-)
--
Todd Allcock, DISH/DirecTV Dealer
Electronic Connection, Lee's Summit, MO
"Under the Usenet Home Reader's Act (UHRA), you may not read this post
if another poster in your Grade B Contour has the same opinion!"
Perry
without a terminator on one end and it read as it should - open when the
terminator was not connected. Based upon this I assumed the wire was OK so
I didn't worry about enclosing the wire behind the siding. etc. (the wires
were added during remodeling rather than original construction). The
problem seems to be one of increased resistance rather than a short -
possibly from a break in the wire which is still touching enough to carry
the signal down from the multi switch but not up to it.
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Rich C <rocourtn...@worldnet.att.net> wrote in message
news:82j65l$39i$1...@cesium.norand.com...
Perry
the line although that would explain the symptom. After the problem was
detected, the connectors on both ends were cut off and carefully replaced by
an experienced person so I doubt the connectors on the end are the problem.
Sounds like I'm down to my last option. Thanks for the assistance.
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ElecConnec <elecc...@aol.comyadayada> wrote in message
news:19991207170328...@ngol03.aol.com...
ElecConnec
<public...@uswest.net> writes:
>The
>problem seems to be one of increased resistance rather than a short -
>possibly from a break in the wire which is still touching enough to carry
>the signal down from the multi switch but not up to it.
There really is no "up" or "down" in this. The wire carries signal (which only
requires one conductor- the center pin) but not voltage (that requires both
conductors- center pin and ground). Since you've checked both ends and said
you checked continuity (did you check the resistance BTW? With terminator it
should be 75 ohms or so and without the terminator nearly infinite.) I'd have
to guess you've crushed the wire behind the siding, or drove a
nail/staple/whatever through it and are shorting the ground and center
conductor together. It's new wire time! :-(
Rich C
Using a terminator (or you can place a resistor of known value across the
center conductor and case) Measure the resistance it should be very close to
the
resistor value or about 80 ohms, if not the cable is open. You know for a
fact there are
no splitters or other gadgets attached on this cable drop? Is there a
ligtning block on any cables?
You understand the control signal is a voltage going to the multiswitch.
Do you get 14-19 volts DC on the output of the Sat receiver? Measuring for
voltage
without RF to the receiver may mislead you as the receiver is looking at a
specific channel for control data. (why your screen says "looking for Sat
Signal)
I assume you have swapped ports on the multiswitch? If the problem moves to
other receivers you have a bad port on the multiswitch and it needs to be
replaced.
Also measure for any AC voltage on the cable or case of the multiswitch to a
good earth
ground?