Antenna Separation On Mast
Posted 24 April 2005 - 02:32 PM
Posted 24 April 2005 - 06:15 PM
Posted 24 April 2005 - 06:26 PM
Posted 24 April 2005 - 06:42 PM
Just goes to prove that theory isn't always correct. Whatever works! Having said that, I agree with C.M. 1 metre spacing, also this would be measured from the bottom of the longest element in the case of vertical polarisation.
I know a lot of people will have a different opinion, but I have two on my one mast, a KMart(Hills) and a Frecarro seperated by only about 6- 9 inches and have no trouble whatsoever.
Posted 24 April 2005 - 07:59 PM
The theory is at least 1/2 wavelength separation. This would be around the length of the element which has the cable connected. If it is a log periodic, that will be the longest dipole.
All separations in the list below are in mm. For the lowest mounted antenna it is the roof particularly if it is metal.
Lowest edge of Band 3, Channel 6: 862
Lowest edge of Band 4, Channel 28: 285
Lowest egge of Band 5, Channel 35: 258
Channel 0: 3 333 mm
Channel 1: 2 679
Channel 2: 2 381
Channel 3: 1 765
FM radio: 1 714
If vertical polarisation is used I would double these figures.
For further explaination see Antenna Design Basics http://www.dtvforum....showtopic=12098
See also Get the best reception
Which transmitter and which antenna
in your geographic strand for the real channels in use.
Posted 25 April 2005 - 07:29 PM
Conclusion 1/: you need a meter.
Conclusion 2/: you still need to use a meter on every job.
Posted 26 April 2005 - 04:36 PM