You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

When referring to the near field, or in the case of this post anyone in local contact range, then yes the angle of radiation can be changed by modifying various dimensions of the antenna. Bob85 has reported this as well as I think one or two others, and modeling also shows that this is possible, which shows a wide range of angles the antenna can be adjusted to radiate towards. I do not know offhand which changes made how much of a difference in this angle offhand, but it does exist.

However, when referring to the TOA, as it applies to DX, that angle does not change when changing various dimensions on this antenna as it is based on how high a certain part of the antenna is and the quality of the earth below.

Using D layer reflection as Needle Bender suspects to get a contact 30 miles out would be NVIS territory. NVIS requires a much lower frequency than CB uses to work.

On a beach, looking out over the ocean, an average adult can see about 20 miles out. However ships of old had something called a "crows nest". What benefit did that give crews of ships? To see further out. Applying this to antennas, even at 30 feet, an antenna is high enough to "see" an antenna 30 miles away, which requires no propagation to communicate from one antenna to another as they are line of sight (unless of course their is something like a hill in between).

The DB

<blockquote data-quote="The DB" data-source="post: 666846" data-attributes="member: 21346">When referring to the near field, or in the case of this post anyone in local contact range, then yes the angle of radiation can be changed by modifying various dimensions of the antenna.&nbsp; Bob85 has reported this as well as I think one or two others, and modeling also shows that this is possible, which shows a wide range of angles the antenna can be adjusted to radiate towards.&nbsp; I do not know offhand which changes made how much of a difference in this angle offhand, but it does exist.However, when referring to the TOA, as it applies to DX, that angle does not change when changing various dimensions on this antenna as it is based on how high a certain part of the antenna is and the quality of the earth below.Using D layer reflection as Needle Bender suspects to get a contact 30 miles out would be NVIS territory.&nbsp; NVIS requires a much lower frequency than CB uses to work.On a beach, looking out over the ocean, an average adult can see about 20 miles out.&nbsp; However ships of old had something called a &quot;crows nest&quot;.&nbsp; What benefit did that give crews of ships?&nbsp; To see further out.&nbsp; Applying this to antennas, even at 30 feet, an antenna is high enough to &quot;see&quot; an antenna 30 miles away, which requires no propagation to communicate from one antenna to another as they are line of sight (unless of course their is something like a hill in between).<a href="http://hittman.us" target="_blank">The DB</a></blockquote>

[QUOTE="The DB, post: 666846, member: 21346"] When referring to the near field, or in the case of this post anyone in local contact range, then yes the angle of radiation can be changed by modifying various dimensions of the antenna. Bob85 has reported this as well as I think one or two others, and modeling also shows that this is possible, which shows a wide range of angles the antenna can be adjusted to radiate towards. I do not know offhand which changes made how much of a difference in this angle offhand, but it does exist. However, when referring to the TOA, as it applies to DX, that angle does not change when changing various dimensions on this antenna as it is based on how high a certain part of the antenna is and the quality of the earth below. Using D layer reflection as Needle Bender suspects to get a contact 30 miles out would be NVIS territory. NVIS requires a much lower frequency than CB uses to work. On a beach, looking out over the ocean, an average adult can see about 20 miles out. However ships of old had something called a "crows nest". What benefit did that give crews of ships? To see further out. Applying this to antennas, even at 30 feet, an antenna is high enough to "see" an antenna 30 miles away, which requires no propagation to communicate from one antenna to another as they are line of sight (unless of course their is something like a hill in between). [COLOR=#000000][URL='http://hittman.us']The DB[/URL][/COLOR] [/QUOTE]

Top Bottom