| Author |
Message |
usenet@danlhenry.com
Guest
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 Posted:
Wed Nov 09, 2005 5:08 pm Post subject:
RG-6 cabling oddity |
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Background:
Back in the GI-950 days, we had our BUD system dealer-installed
using buried ribbon cable (i.e., 2x RG-6 for C and Ku, plus control
wiring). Many years later we upgraded to 4DTV (DSR920). Two or more
years ago, our C-band reception went dark and the dealer came out and
"swapped" the C-band and Ku cables at the LNBs' outputs and receiver
inputs. No more Ku, but that was OK at the time.
Problem:
We have decided we want Ku again and was starting the project of
laying a new separate run of RG-6 for Ku, so I went down to the dish
and disconnected the cable from the Ku LNB. Here's what does not make
sense to me:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
If I finish up with the new Ku cabling, will my C-band magically
reappear?
Thanks for any insight.
--
Dan Henry |
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Ron Stewart
Guest
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| Posted:
Thu Nov 10, 2005 1:08 am Post subject:
Re: RG-6 cabling oddity |
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Dan,
One explanation would be that the ground connection(cable sheild) is bad on
your C-band and your c-band lnb is losing DC power when you disconnect the
ku cable. These cables are supplying DC power to your LNBs and one ground
connection can work for both. If this is true then your c-band LNB is losing
DC power when you disconnect the ku cable. Your set should off and unplugged
when you are connecting and disconnecting these cables.
--
Ron Stewart
Santa Rosa, Calif.
"usenet@danlhenry.com" <google@danlhenry.com> wrote in message
news:1131550321.206093.199460@z14g2000cwz.googlegroups.com...
| Quote: | Background:
Back in the GI-950 days, we had our BUD system dealer-installed
using buried ribbon cable (i.e., 2x RG-6 for C and Ku, plus control
wiring). Many years later we upgraded to 4DTV (DSR920). Two or more
years ago, our C-band reception went dark and the dealer came out and
"swapped" the C-band and Ku cables at the LNBs' outputs and receiver
inputs. No more Ku, but that was OK at the time.
Problem:
We have decided we want Ku again and was starting the project of
laying a new separate run of RG-6 for Ku, so I went down to the dish
and disconnected the cable from the Ku LNB. Here's what does not make
sense to me:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
If I finish up with the new Ku cabling, will my C-band magically
reappear?
Thanks for any insight.
--
Dan Henry
|
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M.M.
Guest
|
| Posted:
Fri Nov 11, 2005 1:08 am Post subject:
Re: RG-6 cabling oddity |
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Dan Henry wrote:
| Quote: | Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
|
The LNB's are powered via the cables. The LNB's have a common ground
(the body of the feedhorn). The ground (shield) connection on the C-band
cable is probably bad so the only return to the receiver is thru the Ku
cable's shield. Disconnecting it removes the power from the C-band LNB.
Before running new cables it might be a good idea to replace the
connectors on both cables. They might both come to life. And new
connectors are a lot cheaper and easier than new cables. Certainly worth
a try. |
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Ron Stewart
Guest
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| Posted:
Fri Nov 11, 2005 1:08 am Post subject:
Re: RG-6 cabling oddity |
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You probably should change your c-band cable at the same time. One more
possibility is that just the connectors at the dish are bad.
Let me know how you fix the problem.
--
Ron Stewart
Santa Rosa, Calif.
"usenet@danlhenry.com" <google@danlhenry.com> wrote in message
news:1131550321.206093.199460@z14g2000cwz.googlegroups.com...
| Quote: | Background:
Back in the GI-950 days, we had our BUD system dealer-installed
using buried ribbon cable (i.e., 2x RG-6 for C and Ku, plus control
wiring). Many years later we upgraded to 4DTV (DSR920). Two or more
years ago, our C-band reception went dark and the dealer came out and
"swapped" the C-band and Ku cables at the LNBs' outputs and receiver
inputs. No more Ku, but that was OK at the time.
Problem:
We have decided we want Ku again and was starting the project of
laying a new separate run of RG-6 for Ku, so I went down to the dish
and disconnected the cable from the Ku LNB. Here's what does not make
sense to me:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
If I finish up with the new Ku cabling, will my C-band magically
reappear?
Thanks for any insight.
--
Dan Henry
|
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| Back to top |
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usenet@danlhenry.com
Guest
|
| Posted:
Sat Nov 12, 2005 12:23 am Post subject:
Re: RG-6 cabling oddity |
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Grounding issues due to connector or cable problems sounds like a
reasonable explanation of the behavior I'm observing.
Thanks your advice and interest. I will post back with my progress.
--
Dan Henry
Ron Stewart wrote:
| Quote: | You probably should change your c-band cable at the same time. One more
possibility is that just the connectors at the dish are bad.
Let me know how you fix the problem.
--
Ron Stewart
Santa Rosa, Calif.
"usenet@danlhenry.com" <google@danlhenry.com> wrote in message
news:1131550321.206093.199460@z14g2000cwz.googlegroups.com...
Background:
Back in the GI-950 days, we had our BUD system dealer-installed
using buried ribbon cable (i.e., 2x RG-6 for C and Ku, plus control
wiring). Many years later we upgraded to 4DTV (DSR920). Two or more
years ago, our C-band reception went dark and the dealer came out and
"swapped" the C-band and Ku cables at the LNBs' outputs and receiver
inputs. No more Ku, but that was OK at the time.
Problem:
We have decided we want Ku again and was starting the project of
laying a new separate run of RG-6 for Ku, so I went down to the dish
and disconnected the cable from the Ku LNB. Here's what does not make
sense to me:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
If I finish up with the new Ku cabling, will my C-band magically
reappear?
Thanks for any insight.
--
Dan Henry
|
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| Back to top |
|
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usenet@danlhenry.com
Guest
|
| Posted:
Sat Nov 12, 2005 12:26 am Post subject:
Re: RG-6 cabling oddity |
|
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usenet@danlhenry.com wrote:
| Quote: | Grounding issues due to connector or cable problems sounds like a
reasonable explanation of the behavior I'm observing.
Thanks your advice and interest. I will post back with my progress.
--
Dan Henry
Ron Stewart wrote:
You probably should change your c-band cable at the same time. One more
possibility is that just the connectors at the dish are bad.
Let me know how you fix the problem.
--
Ron Stewart
Santa Rosa, Calif.
"usenet@danlhenry.com" <google@danlhenry.com> wrote in message
news:1131550321.206093.199460@z14g2000cwz.googlegroups.com...
Background:
Back in the GI-950 days, we had our BUD system dealer-installed
using buried ribbon cable (i.e., 2x RG-6 for C and Ku, plus control
wiring). Many years later we upgraded to 4DTV (DSR920). Two or more
years ago, our C-band reception went dark and the dealer came out and
"swapped" the C-band and Ku cables at the LNBs' outputs and receiver
inputs. No more Ku, but that was OK at the time.
Problem:
We have decided we want Ku again and was starting the project of
laying a new separate run of RG-6 for Ku, so I went down to the dish
and disconnected the cable from the Ku LNB. Here's what does not make
sense to me:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
If I finish up with the new Ku cabling, will my C-band magically
reappear?
Thanks for any insight.
--
Dan Henry
|
My apologies to all for top-posting. My regular news server is down
and I'm not accustomed to the Google newsgroups user interface yet.
--
Dan Henry |
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usenet@danlhenry.com
Guest
|
| Posted:
Sat Nov 12, 2005 12:31 am Post subject:
Re: RG-6 cabling oddity |
|
|
M.M. wrote:
| Quote: | Dan Henry wrote:
Disconnecting the cable from the Ku LNB causes C-band to go dark.
Reconnecting the cable to the Ku LNB restores C-band.
Can anybody help with an explanation?
Why would C-band be dependent on the Ku connection (bad or otherwise)?
The LNB's are powered via the cables. The LNB's have a common ground
(the body of the feedhorn). The ground (shield) connection on the C-band
cable is probably bad so the only return to the receiver is thru the Ku
cable's shield. Disconnecting it removes the power from the C-band LNB.
|
Sounds reasonable.
| Quote: | Before running new cables it might be a good idea to replace the
connectors on both cables. They might both come to life. And new
connectors are a lot cheaper and easier than new cables. Certainly worth
a try.
|
If it's only connectors, I'll be pi**ed at myself. Like a dummy, I've
already dug 180' of new trench through dirt and decomposed granite up
here in the mountains. #*&^@%~$!
--
Dan Henry |
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