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Adding 110Volt to Antenna location

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Old 08-10-2017, 09:32 AM   #91
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Originally Posted by Terryl3 View Post
In the CATV business we had amp's that were 1000's of feet apart, it still could be a problem with the coax, but it still could be letting RF signal down the line.

I've seen line setups that passed RF but not DC, had an open shield somewhere down the line, looked OK with an ohm meter but still had problems passing DC.
Back when the USA and Russia were in the heart of the space race, NASA spent time, money, and man power trying to develop a ink pen that would write in space. Russia had the same problem solved by giving the cosmonauts a box of pencils.
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Old 08-10-2017, 12:20 PM   #92
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should I have used a pencil instead of an amplifier?
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Old 08-10-2017, 07:26 PM   #93
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....the long voltage wrecked about 3 of the other model...Channelmasters...I'd get it when the current would be interrupted and voltage would spike or surge in the run....it would blow the panels out....
That sounds like lightning damage.
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Old 08-10-2017, 08:32 PM   #94
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I kinda thought so also but I found that it was more like surge due to the long run...personally I think it made the voltage unstable at that distance...but it's been 72 hrs now and the system seems to be functioning better than it every has worked....I'm pleased....I'll send another pic when I get the other panel up....
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Old 08-10-2017, 09:40 PM   #95
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personally I think it made the voltage unstable at that distance...
Not enough power in the preamp power supply to do that kind of damage.
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Old 08-12-2017, 12:59 PM   #96
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Thanks to all my communication friends I am getting close to completion....dressed up the inside of my panel today....the birds kinda like the solar panel....I've got the other solar panel coming Monday but it will be a simple snap on to complete....never had it so good on reception....again really appreciate help of this forum...best Chuck in Kentucky
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Old 08-12-2017, 01:19 PM   #97
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Nice tower, is it a free standing Rohn? or some other brand and we can't see the guy wires in the photo.

Good job on the enclosure, hope it does not get too hot inside, I would paint the outside with flat white, that will keep the heat down.
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Old 08-12-2017, 01:55 PM   #98
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Yes...mighty proud of the antenna....my direct tv coming up in November and cut the cord if they don't make changes...put it up about 5 years ago...been perfecting the setup...last fall made a tilt setup with barn hinges....so I can lay it over on saw horse paint etc....use a John Deere with front boom and winch....worked like a charm....we had some 40-50 mile winds and she stood tall. tower is 38' tall..I painted it with reflective aluminum...has a vent space up through the bottom around electrical...but I'll keep an eye on it....go some more foam....can put on side of batteries...tks for compliment....
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Old 08-14-2017, 01:00 PM   #99
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The solar panel was a workable solution.

Yet I suspect that 250' of solid copper center conductor coax would have powered the preamp and that the coax in use is copper clad iron wire. Copper clad RF-6 has a higher DC resistance than solid copper coax.
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Old 08-14-2017, 02:31 PM   #100
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The solar panel was a workable solution.

Yet I suspect that 250' of solid copper center conductor coax would have powered the preamp and that the coax in use is copper clad iron wire. Copper clad RF-6 has a higher DC resistance than solid copper coax.
Yes, and some have an aluminum foil shield with a few strands of aluminum wire, most don't think about the return path, the center conductor and the shield resistance must be totaled together for the correct measurements.

One really long runs I use a #12 or #10 copper wire for the DC ground return.
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Old 08-14-2017, 07:03 PM   #101
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The solar panel was a workable solution.

Yet I suspect that 250' of solid copper center conductor coax would have powered the preamp and that the coax in use is copper clad iron wire. Copper clad RF-6 has a higher DC resistance than solid copper coax.
I bought a CM7777HD during the 4th of July half-price sale and got it to work with 300 ft of RG6; 200 ft of the 300 ft was copper clad steel center conductor and 100 ft was solid copper.
Channelmaster 7777hd

The LED on my 7777HD came ON, the OP's LED did not at 250 ft.

I suspect a problem with his coax.
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Last edited by rabbit73; 08-14-2017 at 07:08 PM..
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Old 08-15-2017, 06:55 PM   #102
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my system was running about 280' of the steel cooper coated wire....channelmaster said distance was too great to run the unit....maybe it would run with 200' and the other wire you had....other folks say the solid copper wire is more fragile for use.....I've got the voltage there now....completing the unit with another panel and will send pic....tks Chuck
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Old 08-15-2017, 10:14 PM   #103
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Originally Posted by machinery-man View Post
my system was running about 280' of the steel cooper coated wire....
Your coax must be growing, it's getting longer each time you tell us.
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Recently have been having some reception issues. First let me advise that my antenna is on near hill top 35' tower with channelmaster 8 bay and there is about a 200' run of rg6 to my house.
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Well a few days has past using the 7777hd in the house at the end of the 250' run and I'm getting excellent results....
I used 330ft including the jumpers which you can see in the photos.

If I had known we were running a competition, I would have tried 400ft.
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Old 08-16-2017, 07:55 AM   #104
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There is no way for us to get to the bottom of what his issue is, so I vote to let it go. He has a solution that he is happy with and that's what the forum is all about.

Now for others who are wanting to try to use very long runs of coax with a CM 7777HD, what should be gleaned from this thread is to check the DC resistance of the type coax you are going to use for very long runs and if you are going to pull it in conduit soap it up liberally or add a messenger wire to do the pulling with, or both. Or feeding it through a section of conduit at a time would also work.

Since the solar power solution was my idea based on providing the easiest way to get his signal where he wanted it, I'm pretty encouraged with his outcome.
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Old 08-16-2017, 09:55 PM   #105
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There is no way for us to get to the bottom of what his issue is,
It looks like that. I had hoped to find out why the LED on Chuck's preamp didn't come ON so that I could help others with a similar problem, but that isn't going to happen.
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so I vote to let it go.
Good idea.
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He has a solution that he is happy with and that's what the forum is all about.
The "right" way is the way that works for him.
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Now for others who are wanting to try to use very long runs of coax with a CM 7777HD, what should be gleaned from this thread is to check the DC resistance of the type coax you are going to use
Using an ohmmeter to measure the resistance and check for shorts and continuity in the coax is certainly a good idea, but I think it is important to verify that the preamp will actually work with a long run before you bury or pull it. The resistance of the coax is important, but it is also a good idea to measure the voltage at the preamp when it is connected to verify that it will work.

To satisfy my own curiosity, I made one more test simulation with 430 feet of RG6, and it was still working and passing signals with less than 4 volts.







Channel Master's current advice is 100 feet max of coax for the 7777HD. That answer isn't very helpful because it doesn't allow for different types of coax. Channel Master isn't giving proper credit to their engineer who designed a preamp that is able to tolerate the low voltage from a long coax run.
Quote:
Since the solar power solution was my idea based on providing the easiest way to get his signal where he wanted it, I'm pretty encouraged with his outcome.
Chuck seems to be happy, too. He has learned about solar power and is able to power his preamp without needing to replace his coax.

I'm happy too. I learned more about the 7777HD preamp, was able to buy one at half price during their 4th of July sale, and my wife gave me a Fluke 115 DMM for our anniversary to measure the voltage to the preamp when it was connected.

I call that a win-win result.
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File Type: jpg CM7777HDtest430ftRG6.jpg (201.8 KB, 2 views)
File Type: jpg CM7777HDtest430ftHi.jpg (214.7 KB, 1 views)
File Type: jpg CM7777HDtest430ftLo.jpg (198.9 KB, 1 views)
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Last edited by rabbit73; 08-16-2017 at 10:11 PM..
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