Cable Resistance

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  • Updated 11 months ago
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3 weeks ago, I had a service call and, my cable to my dish was replaces. Now that's 35 FT of cable. At the time, I had the SB2 modem. Resistance was 1.5 ohms. Two weeks ago, I got the SB2+ (Boost) Modem. For a few days resistance held at 1.5, three days ago it went up to 2.0 ohms and today, it's at 3.0 ohms.

# weeks ago, my TRIA and dish were also replaced, so it's basically a new system now. What would cause the cable resistance to keep climbing like that?
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Bev, Champion

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Posted 12 months ago

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Gregory Davis

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My first thought would be the weather.  For exmple if the outside cabling (coax) maybe collecting moisture from either rain and/or condensation issues.  Not sure how many connectors there are between the TRIA and your modem?  Are these connectors tight - don't overtighten them but if you can turn them with your hand then that's a little too loose.
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Matt B, Viasat Employee

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Gregory took the words right out of my keyboard!  

That's my first thought as well.  Look at the connections, unscrew them and see if there's moisture inside.  
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Markgc, Champion

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I always seal my coax connections with coax seal and have never had any water issues.  https://www.summitsource.com/Coax-Seal-Coax-Sealant-Tape-for-Fittings-Hand-Moldable-Plastic-60-Long-...
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Brian, Champion

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Do you think heat shrink tubing would work?
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Bev, Champion

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I think that would work too, just grease makes it easier to disconnect them if need be later than other products do.
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Markgc, Champion

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Do you think heat shrink tubing would work?
It is not normally used. You could try the adhesive flooded heat shrink but I use products designed for coax sealing.      I also use  Scotch 130C

http://multimedia.3m.com/mws/media/37648O/scotch-linerless-rubber-splicing-tape-130c.pdf

On the big coax. I put on a layer of 130C then a layer of Scotch Super 33 insulating tape, then a layer of coax seal and then a final layer of Scotch Super 33. I make sure that I lay the tape from the bottom upwards, like the shingles on a roof, so that the joints are facing downwards. Nothing is going to get into the coax then.  Always cut the tape with a pair of scissors don't pull it to break it.

I use adhesive heat shrink on the coax end of  PL259 connectors.
(Edited)
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Gwalk900, Champion

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Bev, did the installer apply dielectric grease to all outdoor connectors and then properly weather seal the connection?

Moisture can condense in the "void" within the connector that will lead to issues.  

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Markgc, Champion

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Never seen an installer do this. I normally seal the connectors after they have left. I don't think it is part of the installation instructions.
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Bev, Champion

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Thank you all :) it's fixed now. The outdoor connections were greased, the one that wasn't was the back of the modem inside, of course. It had a bit of moisture in it. Leave it to hot, humid southern days, cool damp nights, my air conditioner and, Harvey to do that. I dried it with q-tips and SD alcohol, reconnected it. I didn't grease that one but, I know what to do when it does that again.

That is going to be a recurring thing at certain times of the year here. Also good to know if it happens to others in similar climates.

NOTE TO OTHERS: Be very careful doing what I did, if unsure of yourself, call for a service call and, let a technician do it. I build my own computers, among other electronics hobbies, so I'm fine doing little things like that and, know to be careful not to bend or break anything and, make sure it's 100% dry before reconnecting it.
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Bev, Champion

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Yes, humidity in my home is always 80% and above. I run window unit air conditioners to keep the house cool. With Harvey here, indoor humidity is hovering right at 95% and, it's getting down into the mid 60's at night indoors and, 85 during the day.

The room the modem is in is also open to the kitchen and, canning and, general cooking adds steam to the air on top of the ambient humidity. Not surprising to me, with the temperature changes and, high humidity, condensation happens.

Windows have been fogged up every evening from about 9PM until about 8 AM every day since Harvey made landfall. Without a storm making it this damp and, creating such a large temperature change every night, it wouldn't happen. If I had central air, or ran dehumidifiers it wouldn't happen. May not happen if I didn't can or boil as much food in the kitchen, or if the modem were more isolated form the kitchen either.
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Markgc, Champion

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With humidity levels that high I would be concerned about mould growth in the house and within the wall cavities.  You might want to look at getting a dehumidifier.  They have worked well for me in the past.
(Edited)
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Bev, Champion

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Money, money, money. Yes mold is a problem in my area, but, I use cleaning products and do check crawl spaces and the attic twice a year. Personally, I'd sped the 400 or so for a whole home dehumidifier but, DH says air conditioner already cost too much, and uses too much electricity. (He lived in Florida WITHOUT air conditioning most of his life so, doesn't think we really need it here.)

Maybe I'll get a new job and move to Colorado. XD
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Andy Schack

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Bev, you might want to consider installing what is called a mini-split or ductless a/c unit. They are extremely energy efficient and will do wonders with overall comfort and moisture extraction. We added on about 800 sq ft a few yeas ago and I bought one and am VERY happy with the investment.

Andy
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Bev, Champion

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I will look into that, it may be more cost effective than window units, though I suspect the layout of my home would require two units without duct work being involved - one section is isolated form the rest of the house 99% of the time.
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Captain318

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Mine sometimes climbs up and all I have to do is restart the modem and it's ok again
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Captain318

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Scroll up. It was in response to a comment by Andy Schack. Just sharing some information
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Captain318

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Scroll up. It was in response to a comment by Andy Schack. Just sharing some information
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Barry Paepcke

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reading this post about resistance I just ck mine and it is 4.0 is that something to be concerned about?

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Andy Schack

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Barry. 4 is definitely on the high side BUT...BUT, if everything is working fine then "don't fix it if it ain't broke". If it ends up being a problem what you'll start experiencing your modem all of a sudden rebooting...working for a while and then rebooting again. If that does begin to happen, call and have a service call set up.

Your installer probably used your existing coax......I've done the same...only problem is that now it is causing a problem. He might have to run a dedicated line.

Andy
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Jim, Champion

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Barry - 
Take a look at the printing on your cable jacket. You should see either a "CC" or "SC" printed on it. "SC" is for "solid copper." Solid copper is required and your installer should not have used existing cable unless it was solid copper.