Hello,

For a Disconne in the attic (for vhf/uhf), receiving only, do you think a
wet roof from rain would make
a "meaningful" difference in reception ?

Bob

No.

73's
Richard Clark, KB7QHC

Robert11 wrote:
Hello,

For a Disconne in the attic (for vhf/uhf), receiving only, do you think a
wet roof from rain would make
a "meaningful" difference in reception ?

Bob



Depends on the type of roof and frequency you're working. If the roof
absorbs (small amounts of) water, or if water can stand on the roof,
then I'd say: Yes. Wet trees can also absorb radio waves better then dry
ones. Don't see why roofs are any different.
HF will suffer most, VHF and UHF will probably not be affected as much.
But I've spoken to a local 2m amateur with indoor antenna who claimed to
notice the difference between wet and dry.

--
RigReference.com - Reference guide for ham radio equipment
http://rigreference.com/

Other than the noise floor being a little lower when it rains,not really. You'll get varying opinions on this I'm sure,but I notice little if any difference.
N9ZAS

. Wet trees can also absorb radio waves better then dry
ones.

Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,

http://www.biology4kids.com/files/pl...lemphloem.html

Bill wrote:
. Wet trees can also absorb radio waves better then dry
ones.

Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,

http://www.biology4kids.com/files/pl...lemphloem.html

You must live where it never freezes. The difference between summer
and winter on 2m and up is certainly noticeable and measurable here in
Minnesota.

tom
K0TAR

Bill wrote:
. Wet trees can also absorb radio waves better then dry
ones.

Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,

http://www.biology4kids.com/files/pl...lemphloem.html

Oops, forgot to say that water, even with the contaminants of life in
it, doesn't conduct very well when frozen.

tom
K0TAR

On Oct 26, 8:19*am, tom wrote:
Bill wrote:
. Wet trees can also absorb radio waves better then dry
ones.

Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,

http://www.biology4kids.com/files/pl...lemphloem.html

You must live where it never freezes.

The original question had to do with rain, did it not? Not ice.

* The difference between summer
and winter on 2m and up is certainly noticeable and measurable here in
Minnesota.

tom
K0TAR

And the difference is attributed to what?

On Oct 26, 8:35*am, tom wrote:
Bill wrote:
. Wet trees can also absorb radio waves better then dry
ones.

Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,

http://www.biology4kids.com/files/pl...lemphloem.html

Oops, forgot to say that water, even with the contaminants of life in
it, doesn't conduct very well when frozen.

tom
K0TAR

The original question had to do with interference with radio
reception, not with conduction.

Bill wrote:
On Oct 26, 8:19 am, tom wrote:
Bill wrote:
. Wet trees can also absorb radio waves better then dry
ones.
Trees have vascular systems so are "wet" all the time. Dry trees are
dead trees,
http://www.biology4kids.com/files/pl...lemphloem.html
You must live where it never freezes.

The original question had to do with rain, did it not? Not ice.

I was responding to "wet" versus "dead".


The difference between summer
and winter on 2m and up is certainly noticeable and measurable here in
Minnesota.


And the difference is attributed to what?

Very very simple physics.

tom
K0TAR