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

I'll have to dig around in the shop and see if I can find one of my old harnesses, and see how it acts hooked up to my dummy loads.

You may be right, but I have never seen a 50 ohm complex load from a 1/4 wave radiator attached to a mobile. Sometimes it's even difficult for me to get such a load on a real 1/4 wave base radiator, with slanted down radials unless I have real good control over the slant of the radials below 50* degrees.

Check out this 1/4 wave with 50* degree radials. This is the Z I usually see and worse when reading the match at the feed point on a mobile. When I check through the feed line, this match does often get better due to transformation. This is why I think guys typically tell us they have a perfect match in their mobiles with a flat SWR that is low and hardly moves the needle. IMO many mobiles can't come close to this angle and provide the necessary ground plane. We found that installing these co-phase setup closer to the ground, on the bumper of pickup trucks seem to improve performance just using old Mother Earth on the roadway. This was the reason for my work with the 102" whip over the years, long before I could make a model.

[ATTACH]6665[/ATTACH]

<blockquote data-quote="Marconi" data-source="post: 352063" data-attributes="member: 903">I&#039;ll have to dig around in the shop and see if I can find one of my old harnesses, and see how it acts hooked up to my dummy loads. &nbsp;You may be right, but I have never seen a 50 ohm complex load from a 1/4 wave radiator attached to a mobile. Sometimes it&#039;s even difficult for me to get such a load on a real 1/4 wave base radiator, with slanted down radials unless I have real good control over the slant of the radials below 50* degrees. &nbsp;Check out this 1/4 wave with 50* degree radials. This is the Z I usually see and worse when reading the match at the feed point on a mobile. When I check through the feed line, this match does often get better due to transformation. This is why I think guys typically tell us they have a perfect match in their mobiles with a flat SWR that is low and hardly moves the needle. IMO many mobiles can&#039;t come close to this angle and provide the necessary ground plane. We found that installing these co-phase setup closer to the ground, on the bumper of pickup trucks seem to improve performance just using old Mother Earth on the roadway. This was the reason for my work with the 102&quot; whip over the years, long before I could make a model.&nbsp;[ATTACH]6665[/ATTACH]</blockquote>

[QUOTE="Marconi, post: 352063, member: 903"] I'll have to dig around in the shop and see if I can find one of my old harnesses, and see how it acts hooked up to my dummy loads. You may be right, but I have never seen a 50 ohm complex load from a 1/4 wave radiator attached to a mobile. Sometimes it's even difficult for me to get such a load on a real 1/4 wave base radiator, with slanted down radials unless I have real good control over the slant of the radials below 50* degrees. Check out this 1/4 wave with 50* degree radials. This is the Z I usually see and worse when reading the match at the feed point on a mobile. When I check through the feed line, this match does often get better due to transformation. This is why I think guys typically tell us they have a perfect match in their mobiles with a flat SWR that is low and hardly moves the needle. IMO many mobiles can't come close to this angle and provide the necessary ground plane. We found that installing these co-phase setup closer to the ground, on the bumper of pickup trucks seem to improve performance just using old Mother Earth on the roadway. This was the reason for my work with the 102" whip over the years, long before I could make a model. [ATTACH]6665[/ATTACH] [/QUOTE]

Top Bottom