|
|
|
1
|
2
|
3
|
4
|
5
|
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
|
27
|
28
|
29
|
30
|
|
|
|
|
|
107 registered members (canichols424, mdf, Lvlhdd, Fishduck, ronfromramer, aubigmac, FPPop, hamma, cchoque93, wareagul, RSF, MadMallard, Kdog, NVM1031, GomerPyle, slim68, Holcomb, Canterberry, 7PTSPREAD, Skullworks, Mdees, Reptar, Turkeytrott82, Heath, therealhojo, jdhunter2011, klay, cullbuck, zwick, BC, salock, WDE, WPZJR, Ridge Life, slipperyrock, joeml18, dsmc, AU coonhunter, A_buck, trlrdrdave, clayk, thayerp81, twaldrop4, globe, IMISSALDEER, jmj120, longshot, Tall Dog, CAM, Lil_Fella, Woody1, CRUTCHJD76, Lockjaw, BCLC, JBrown1975, Strictlybow, dwaugh, Hunting-231, HHSyelper, Ron A., m97, scrape, BamaGuitarDude, Ray_Coon, foldemup, apolloslade, UncleHuck, Brian_C, Jotjackson, WMEC615, MurphySimmons, DryFire, RareBreed, Overland, donia, mzzy, Mully, gradythemachine, KENT, sawdust, JAT, bobbyc, Cahabariverrat, Omega One, Morris, csanders, Bushmaster, rickyh_2, Chancetribe, Savage33, fur_n_feathers, CrappieMan, Bowhunter84, 4Tigers, Chaser357, mdavis, Standbanger, bug54, 9 invisible),
1,033
guests, and 0
spiders. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
Re: Antenna help--long read
[Re: Wadenthebushes]
#2256670
10/13/17 01:17 PM
10/13/17 01:17 PM
|
Joined: Dec 2014
Posts: 2,178
Hamilton/Auburn
Shotts
8 point
|
8 point
Joined: Dec 2014
Posts: 2,178
Hamilton/Auburn
|
Typically anything less than 4 wave lengths is considered near field and can interfere with normal operation. Seems like TV wavelengths are in the 1-5m length in which case you will need to be 12-20 ft from large metal objects to reduce near field interference. YMMV
Last edited by Shotts; 10/13/17 04:55 PM.
Life is difficult
Science prevails over bulldoodoo and superstition every time
|
|
|
Re: Antenna help--long read
[Re: Shotts]
#2256706
10/13/17 01:45 PM
10/13/17 01:45 PM
|
Joined: Jun 2015
Posts: 176
Central Ala.
Wadenthebushes
OP
3 point
|
OP
3 point
Joined: Jun 2015
Posts: 176
Central Ala.
|
Typically anything less than 4 wave lengths is considered near field and can interfere with normal operation. Seems like TV wavelengths are in the 1-5m length in which case you Wallis need to be 12-20 ft from large metal objects to reduce near field interference. YMMV Thanks this is the kind of info I needed.
|
|
|
Re: Antenna help--long read
[Re: Shotts]
#2257253
10/13/17 08:16 PM
10/13/17 08:16 PM
|
Joined: Sep 2007
Posts: 7,858
Hartselle, AL
trlrdrdave
14 point
|
14 point
Joined: Sep 2007
Posts: 7,858
Hartselle, AL
|
Typically anything less than 4 wave lengths is considered near field and can interfere with normal operation. Seems like TV wavelengths are in the 1-5m length in which case you will need to be 12-20 ft from large metal objects to reduce near field interference. YMMV The middle of the UHF band would be close to 650MHZ. So .5 meter would be the wave length. 4 or 5ft. Above the tallest part of the roof you should be good. Think of a yagi as a flash light looking for the tower. You cant see it if you are looking through the roof. If you are on the same side of the roof as the tower is it could help reception. Short answer 3 or 4 feet above the ridge and pointed at the tower (or in the middle of the cluster) you should be good. 1-5 meters would be well below the UHF tv band.
"In time of war, send me all the Alabamians you can get, but in time of peace, for Lord's sake, send them to somebody else." General Edward H. Plummer
"Blessed are those who, in the face of death, think only about the front sight." Jeff Cooper
|
|
|
|
