Using STL dish to share Lan link connection

Gotta watch those Fresnel zones!
fmrfman
Posts: 66
Joined: Sun Aug 17, 2014 1:43 am

Re: Using STL dish to share Lan link connection

Post by fmrfman » Mon Jul 20, 2015 4:44 am

Tower crew is here painting and brought the line back down to the ground for me. I reterminated the line and sent it back up. The switch showed the port connected at 10mbps/half but I could not bring up the management interface. Decided to reterminate the switch side of the connection. When cutting the jacket I discovered copious amounts of water. The previous tower crew must have nicked the cable while working with it last time. Googles search turned up others experiencing the same issue.

User avatar
kkiddkkidd
Posts: 462
Joined: Mon Dec 03, 2007 11:13 am
Location: Lawrenceburg, TN

Re: Using STL dish to share Lan link connection

Post by kkiddkkidd » Mon Jul 20, 2015 7:08 am

If it doesn't have waterproofing gel inside, it likely isn't outdoor rated cable hence probably not UV protected jacked hence the jacket could be broken in a hundred places.

And sometimes outdoor rated cable... Isn't.

However if it shows a connection on the switch AND both pairs have conductivity, I would think that you should get some level of response if the radio is functional.

Do you see activity on the switch? You probably need to bring the radio down and test it on the ground as well as replace the cable with outdoor rated cable.
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

fmrfman
Posts: 66
Joined: Sun Aug 17, 2014 1:43 am

Re: Using STL dish to share Lan link connection

Post by fmrfman » Mon Jul 20, 2015 8:04 pm

Its toughcable carrier class. New cable ran today radio now comes up at 10 Mbps max. New radio goes in tomorrow.

User avatar
kkiddkkidd
Posts: 462
Joined: Mon Dec 03, 2007 11:13 am
Location: Lawrenceburg, TN

Re: Using STL dish to share Lan link connection

Post by kkiddkkidd » Tue Jul 21, 2015 7:34 am

Glad that you got it working.

UBNT had a bad (possibly several) batch(s) of cable early in their production run that didn't have the correct UV protection. The jacket would deteriorate, crack and allow water intrusion. Some of the extreme cases that I have seen had the jacket broken into pieces just an inch or two long. IF it is the UV problem AND you have receipts for the cable, UBNT has been replacing it under warranty.

I have some on my tower here that has been working well and appears to be OK after several years. I think that it has gel in it but it has been several years since we hung it on my tower.

Good luck,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

User avatar
Xenirad
Posts: 57
Joined: Tue Mar 18, 2014 9:16 am
Location: Prichard, WV
Contact:

Re: Using STL dish to share Lan link connection

Post by Xenirad » Sat Aug 08, 2015 8:04 am

I have had the best luck using the UBNT ToughCable Carrier cable over anything else I have tried. If someone knows of something better please post.
Thanks.
Fred Francis, Owner Xenirad Broadcast Engineering http://www.xenirad.com

User avatar
kkiddkkidd
Posts: 462
Joined: Mon Dec 03, 2007 11:13 am
Location: Lawrenceburg, TN

Re: Using STL dish to share Lan link connection

Post by kkiddkkidd » Sat Aug 08, 2015 9:44 am

I have been using:

https://www.tessco.com/products/display ... sku=315167

on AM and a couple of problem FMs with good results. It has a fairly heavy copper shield although it is just wrapped around the internal bundle.

I am using it on a couple of AM towers now and one FM in particular that is a directional with a terrible pattern. It apparently has extremely high field areas on the tower below the FM antennas. It is only 4.1kw into an 8bay but if I have the hop up box on my Cummins Dodge, it will kill it dead at exactly the same point in the driveway almost directly under the antenna. 25kw with what is supposed to be a 4kw pullin. It is actually pulled in TO 600w V and 2kw H according to the antenna docs. I don't see how the FCC accepted it with that deep of a null.
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

User avatar
Deep Thought
Posts: 3132
Joined: Thu Mar 20, 2008 9:23 am
Location: La Grange, IL
Contact:

Re: Using STL dish to share Lan link connection

Post by Deep Thought » Sat Aug 08, 2015 10:21 am

kkiddkkidd wrote:I don't see how the FCC accepted it with that deep of a null.
I'd bet the licensed envelope isn't that deep. The FCC requirement for the actual antenna is to stay inside that envelope and generate at least 85% of the pattern envelope RMS. They don't concern themselves with excessively deep nulls.

They do concern themselves with excessive EMR at the tower base though.
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

User avatar
kkiddkkidd
Posts: 462
Joined: Mon Dec 03, 2007 11:13 am
Location: Lawrenceburg, TN

Re: Using STL dish to share Lan link connection

Post by kkiddkkidd » Sat Aug 08, 2015 1:10 pm

It's no where close to that. It only has to be pulled in to about 21kw over about 90 degrees. The GM that decided to move this station was very cheap and secretive. I feel sure that he didn't ask his (then) engineer and took the first pattern that ERI produced.
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

User avatar
Deep Thought
Posts: 3132
Joined: Thu Mar 20, 2008 9:23 am
Location: La Grange, IL
Contact:

Re: Using STL dish to share Lan link connection

Post by Deep Thought » Sat Aug 08, 2015 2:24 pm

Nowhere close to what? ERI had to put the RMS on the pattern docs that were filed with the Commish, and that's all they look at except for whether the actual antenna is inside the pattern envelope. Not saying it didn't get by a processing engineer especially since they aren't terribly worried about a station shooting itself in the head with a bad antenna, but that bit is in the rules.
§73.316(c)(2)(ix)(A) For a station authorized pursuant to §73.215 or Sec. §73.509, a showing that the root mean square (RMS) of the measured composite antenna pattern (encompassing both the horizontally and vertically polarized radiation components (in relative field)) is at least 85 percent of the RMS of the authorized composite directional antenna pattern (in relative field).
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

User avatar
kkiddkkidd
Posts: 462
Joined: Mon Dec 03, 2007 11:13 am
Location: Lawrenceburg, TN

Re: Using STL dish to share Lan link connection

Post by kkiddkkidd » Sat Aug 08, 2015 4:09 pm

Nowhere close to the allowed pattern. Much, much less than the allowed pattern over several degrees. Somewhere I have a drawing from ERI with the patterns (measured and target) over layed that highlights the needless deep null in the pattern. As I mentioned, I am surprised that the FCC accepted it.
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest