Passively reducing ground loss?Practical 80m vertical wire antennas without radials?Does iron ore in the ground affect my signal?Using Earth as an RF groundWhich is better in my situation: Balanced dipole, or as much wire as possible in the air?DAB antenna in roof spaceWhen and why does the size of a ground plane or radials matter?How to probe a dipole antenna?Not-too-distant saltwater groundCounterpoise/ground/radial options for an Inverted LNoise reduction
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Passively reducing ground loss?
Practical 80m vertical wire antennas without radials?Does iron ore in the ground affect my signal?Using Earth as an RF groundWhich is better in my situation: Balanced dipole, or as much wire as possible in the air?DAB antenna in roof spaceWhen and why does the size of a ground plane or radials matter?How to probe a dipole antenna?Not-too-distant saltwater groundCounterpoise/ground/radial options for an Inverted LNoise reduction
$begingroup$
Would a disconnected wire or conductive mat below a low height antenna reduce ground losses?
A tuned length of wire under a wire antenna might be suitable for NVIS gain. But would a bunch of space blankets or unconnected random length wires or mesh (gopher wire) on or slightly above the ground help reduce ground loss of a low dipole or a vertical with far too few counterpose radials? (e.g. maybe one).
antenna-theory wire-antenna antenna-system earth
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
$endgroup$
add a comment |
$begingroup$
Would a disconnected wire or conductive mat below a low height antenna reduce ground losses?
A tuned length of wire under a wire antenna might be suitable for NVIS gain. But would a bunch of space blankets or unconnected random length wires or mesh (gopher wire) on or slightly above the ground help reduce ground loss of a low dipole or a vertical with far too few counterpose radials? (e.g. maybe one).
antenna-theory wire-antenna antenna-system earth
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
$endgroup$
$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
1
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago
add a comment |
$begingroup$
Would a disconnected wire or conductive mat below a low height antenna reduce ground losses?
A tuned length of wire under a wire antenna might be suitable for NVIS gain. But would a bunch of space blankets or unconnected random length wires or mesh (gopher wire) on or slightly above the ground help reduce ground loss of a low dipole or a vertical with far too few counterpose radials? (e.g. maybe one).
antenna-theory wire-antenna antenna-system earth
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
$endgroup$
Would a disconnected wire or conductive mat below a low height antenna reduce ground losses?
A tuned length of wire under a wire antenna might be suitable for NVIS gain. But would a bunch of space blankets or unconnected random length wires or mesh (gopher wire) on or slightly above the ground help reduce ground loss of a low dipole or a vertical with far too few counterpose radials? (e.g. maybe one).
antenna-theory wire-antenna antenna-system earth
antenna-theory wire-antenna antenna-system earth
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
edited 6 hours ago
hotpaw2
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
asked 8 hours ago
hotpaw2hotpaw2
3,27321935
3,27321935
$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
1
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago
add a comment |
$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
1
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago
$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
1
1
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
It is well-established that a wire reflector --on or just above the ground-- directly under a dipole can do just that.
I don't have a reference, but at a field day that I was present at years ago, a ham on 75m did that. Afterwards, as W8JI (who also was present) said, "He was just 'killing people'", meaning that his QSO count immediately went way up. His reflector was directly under his center-fed dipole. IIRC, it was laying directly on the ground. Although the spacing between the wire and the dipole was not optimum, it certainly seemed to work.
It was good and conductive soil, in NW Ohio near the Maumee River where Route 235 ends at a SW-NE road parallel with it. 200 years ago, that was part of the Great Black Swamp. Later, ditches were dug and tiles laid to drain it into the river, which turned all of Lucas and Wood county into fertile farmland. Still, adding that wire helped his signal.
Perhaps the band conditions improved at the same time, and the wire had little or nothing to do with it. But I've heard of too many similar experiences to discount that.
As for a vertical as you describe, I'm leaving that for someone else to answer.
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
$endgroup$
add a comment |
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1 Answer
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$begingroup$
It is well-established that a wire reflector --on or just above the ground-- directly under a dipole can do just that.
I don't have a reference, but at a field day that I was present at years ago, a ham on 75m did that. Afterwards, as W8JI (who also was present) said, "He was just 'killing people'", meaning that his QSO count immediately went way up. His reflector was directly under his center-fed dipole. IIRC, it was laying directly on the ground. Although the spacing between the wire and the dipole was not optimum, it certainly seemed to work.
It was good and conductive soil, in NW Ohio near the Maumee River where Route 235 ends at a SW-NE road parallel with it. 200 years ago, that was part of the Great Black Swamp. Later, ditches were dug and tiles laid to drain it into the river, which turned all of Lucas and Wood county into fertile farmland. Still, adding that wire helped his signal.
Perhaps the band conditions improved at the same time, and the wire had little or nothing to do with it. But I've heard of too many similar experiences to discount that.
As for a vertical as you describe, I'm leaving that for someone else to answer.
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
$endgroup$
add a comment |
$begingroup$
It is well-established that a wire reflector --on or just above the ground-- directly under a dipole can do just that.
I don't have a reference, but at a field day that I was present at years ago, a ham on 75m did that. Afterwards, as W8JI (who also was present) said, "He was just 'killing people'", meaning that his QSO count immediately went way up. His reflector was directly under his center-fed dipole. IIRC, it was laying directly on the ground. Although the spacing between the wire and the dipole was not optimum, it certainly seemed to work.
It was good and conductive soil, in NW Ohio near the Maumee River where Route 235 ends at a SW-NE road parallel with it. 200 years ago, that was part of the Great Black Swamp. Later, ditches were dug and tiles laid to drain it into the river, which turned all of Lucas and Wood county into fertile farmland. Still, adding that wire helped his signal.
Perhaps the band conditions improved at the same time, and the wire had little or nothing to do with it. But I've heard of too many similar experiences to discount that.
As for a vertical as you describe, I'm leaving that for someone else to answer.
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
$endgroup$
add a comment |
$begingroup$
It is well-established that a wire reflector --on or just above the ground-- directly under a dipole can do just that.
I don't have a reference, but at a field day that I was present at years ago, a ham on 75m did that. Afterwards, as W8JI (who also was present) said, "He was just 'killing people'", meaning that his QSO count immediately went way up. His reflector was directly under his center-fed dipole. IIRC, it was laying directly on the ground. Although the spacing between the wire and the dipole was not optimum, it certainly seemed to work.
It was good and conductive soil, in NW Ohio near the Maumee River where Route 235 ends at a SW-NE road parallel with it. 200 years ago, that was part of the Great Black Swamp. Later, ditches were dug and tiles laid to drain it into the river, which turned all of Lucas and Wood county into fertile farmland. Still, adding that wire helped his signal.
Perhaps the band conditions improved at the same time, and the wire had little or nothing to do with it. But I've heard of too many similar experiences to discount that.
As for a vertical as you describe, I'm leaving that for someone else to answer.
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
$endgroup$
It is well-established that a wire reflector --on or just above the ground-- directly under a dipole can do just that.
I don't have a reference, but at a field day that I was present at years ago, a ham on 75m did that. Afterwards, as W8JI (who also was present) said, "He was just 'killing people'", meaning that his QSO count immediately went way up. His reflector was directly under his center-fed dipole. IIRC, it was laying directly on the ground. Although the spacing between the wire and the dipole was not optimum, it certainly seemed to work.
It was good and conductive soil, in NW Ohio near the Maumee River where Route 235 ends at a SW-NE road parallel with it. 200 years ago, that was part of the Great Black Swamp. Later, ditches were dug and tiles laid to drain it into the river, which turned all of Lucas and Wood county into fertile farmland. Still, adding that wire helped his signal.
Perhaps the band conditions improved at the same time, and the wire had little or nothing to do with it. But I've heard of too many similar experiences to discount that.
As for a vertical as you describe, I'm leaving that for someone else to answer.
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
edited 6 hours ago
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
answered 7 hours ago
Mike Waters♦Mike Waters
4,0572635
4,0572635
add a comment |
add a comment |
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$begingroup$
Random long wires - probably will help. Space blankets and other things $< 1over4lambda$, not connected together, will make no difference, the fields will go right through them.
$endgroup$
– tomnexus
6 hours ago
$begingroup$
What's a space blanket? I'm assuming that it's a thin layer of aluminum vacuum-deposited on a Mylar sheet.
$endgroup$
– Mike Waters♦
6 hours ago
$begingroup$
Would connecting enough space blankets (aluminized mylar) to get close to 1/4 lambda by overlap (capacitive coupling) and/or wire staples help?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
It seems to me that galvanized chicken wire (poultry netting) or other plated fencing material would be cheaper --not to mention more effective-- than space blankets. Besides, the aluminum might be hard to connect to the earth. Both of those materials have been used in addition to ground radials. I suggest that you search the Topand Reflector archives, as this has been asked and answered there many times. And ditto to what Kevin just said. :-)
$endgroup$
– Mike Waters♦
4 hours ago
1
$begingroup$
@tomnexus Please don't write answers — short, partial, or otherwise, in comments. Even a short answer sometimes turns out to be just right, and a comment can't be accepted — or ranked by its votes. Comments on questions are best used for asking for clarification of the question.
$endgroup$
– Kevin Reid AG6YO♦
4 hours ago