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Old 12-Mar-2020, 5:59 PM   #21
Tower Guy
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Quote:
Originally Posted by olnick View Post
Tower Guy mentioned lowering the antenna to find the "sweet spot" what is the distance between the layers? Am I looking at 6 inches or 3 feet to find the "sweet" spot? It might be easier to go up 6-8 inches with a re location of my chimney mounts rather than going down 20-25 inches!

Thanks

Olnick
The vertical distance from peak signal to null on channel 31 is calculated as 20.5 inches.
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Old 18-Mar-2020, 10:34 PM   #22
olnick
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Just got off the roof again! Today was an 8-10 times on the damn roof. Its been a busy week. got a new RCA tvpreamp to replace the unit now in place. I ended up with a Tvpreamp1R from Lowe's It was advertised as a Tvpreamp12E. so much for advertising!! The first thing I did was to check the P/S inserter. not good only had 9.01 VDC coming out. My old unit that works excellent in the cold weather provided 9.50 VDC. So either way I figure I have a good power inserter. I go to the trouble of replacing the amp yeah up on the roof and plugin the new power inserter then NOTHING I had better reception without any amp!! I replaced the new power inserter with my old one still Nothing. Just about ready to say@!#$#@%$ and deal with the cable man when I decide to open up my old temp sensitive Tvpreamp to check it out. What I found was the two "F" connectors one for the power/out and the combined input were both broken on all four grounding legs onto the P/C board?????? I just happen to have replacements in my stock/junk pile. so I replaced both "F" connectors and re-installed the amp back up onto the antenna mount/mast. (I needed to remove the new DOA amp to return for a refund anyway). The first re scan with the old power inserter and my repaired preamp gave me 13 channels 31 total digital!(still missing Ch 31 fox 25) To make it better I adjusted the direction to closer to 162 deg mag. Now I have 10 channels 26 total digital. So to improve on this I check the direction and lower the antenna to the original height of the first reading 8 inches lowered from max. now I get 9 channels 21 total digital. The first reading was at 2 PM the second at 2:30 and the third at 3 PM. Its now Long Trail double bag time........ Any thoughts/ideas/suggestions?????? The cable man is looking better and better!!! Sad To say..

Thanks Olnick
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Old 20-Mar-2020, 1:51 PM   #23
rickbb
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It does not look good for that channel. You are in a RF shadow behind a hill from the tower and the effective power at your location is less than 100kw.

Sorry.
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Old 22-Mar-2020, 1:46 PM   #24
olnick
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Its cold out again this AM 18 deg. All my channels are back again??????????????? What am I missing???? there has to be a simple explanation for this happening with cold temperatures! I have done NOTHING else since my last posting just cold weather!

OlNick
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Old 23-Mar-2020, 1:30 PM   #25
rickbb
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If everything has been ruled out other than temp changes, then it has to be a expansion/contraction issue of something in the system.

I can't think of anything else that would explain it.

Unless it's an atmosphere thing, colder denser air vs. warm less dense air, or visa/versa blocking or not blocking signals. But that's really just a WAG. (Wild A__ Guess).
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Old 23-Mar-2020, 1:30 PM   #26
Tower Guy
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Things that could cause better reception in cold weather:

Water in the coax.
Temperature sensitive preamp.
Propagation changes due to atmospheric conditions.
Dry leaves.
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Old 26-Mar-2020, 3:21 PM   #27
olnick
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Well one last shot at it!! I'm waiting for the new preamp to be delivered, then some better weather, new coax is all set and ready to install as well. I'll post my results good/bad or in different.. Right now there are NO leaves on the trees!

OlNick
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