Topics

antenna issue found


Dg Arnholt <dgarnholt@...>
 

kinda thought it was that. still the kenwood shuting down is a mystery..i didnt think it had swr shut down.. hope the finals are ok. 
oh yeah the antenna problem simple :) wire touching a tree..gonna get a rope and pull it off and in the future get some help to move the antenna leg. i would cut the tree but this is rental property


Nick-WA5BDU
 

My antenna wires touch tree limbs all the time.  That shouldn't cause you any problems.

72,

Nick, WA5BDU

On 3/10/2013 7:20 PM, Dg Arnholt wrote:
 
kinda thought it was that. still the kenwood shuting down is a mystery..i didnt think it had swr shut down.. hope the finals are ok. 
oh yeah the antenna problem simple :) wire touching a tree..gonna get a rope and pull it off and in the future get some help to move the antenna leg. i would cut the tree but this is rental property







Todd K7TFC
 

On Mon, Mar 11, 2013 at 6:53 PM, Nick-WA5BDU <nick-wa5bdu@...> wrote:

My antenna wires touch tree limbs all the time.  That shouldn't cause you any problems.

Does it make a difference if the wire is insulated or bare when it touches trees?
 
73,

Todd
------------------------------------------------------------------------------------
K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
------------------------------------------------------------------------------------
QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design




72,

Nick, WA5BDU

On 3/10/2013 7:20 PM, Dg Arnholt wrote:
 
kinda thought it was that. still the kenwood shuting down is a mystery..i didnt think it had swr shut down.. hope the finals are ok. 
oh yeah the antenna problem simple :) wire touching a tree..gonna get a rope and pull it off and in the future get some help to move the antenna leg. i would cut the tree but this is rental property








KK0S
 

- I think the answer here might be, "Yes - but..." Even at QRP power levels, there can be varying amounts of interplay depending on where the tree is touching the antenna along the voltage/current (impedance) profile of the antenna. The affect can also be influenced with how wet or dry is the bark of the tree. There was an article years ago about the US Military using living trees as vertical antennas... not overwhelming results if I remember correctly....

72,
Bruce - KK0S

--- In 4sqrp@..., Nick-WA5BDU <nick-wa5bdu@...> wrote:

My antenna wires touch tree limbs all the time. That shouldn't cause
you any problems.

72,

Nick, WA5BDU

On 3/10/2013 7:20 PM, Dg Arnholt wrote:
kinda thought it was that. still the kenwood shuting down is a
mystery..i didnt think it had swr shut down.. hope the finals are ok.
oh yeah the antenna problem simple :) wire touching a tree..gonna get
a rope and pull it off and in the future get some help to move the
antenna leg. i would cut the tree but this is rental property

<http://groups.yahoo.com/group/4sqrp/post;_ylc=X3oDMTJwMGdzcWM5BF9TAzk3MzU5NzE0BGdycElkAzg3MDE2MjU2BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NDUEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzYyOTYxMjIz?act=reply&messageNum=645>





George H. Gates
 

One of the ham mags had a article about using a tree as a vertical. Don't remember the issue or what the conclusion was. Must not have been good or guys would be using it for portable work!  72 Geo/W2BPI
 

In a message dated 3/12/2013 5:47:14 A.M. Eastern Daylight Time, bbarley48@... writes:
 

- I think the answer here might be, "Yes - but..." Even at QRP power levels, there can be varying amounts of interplay depending on where the tree is touching the antenna along the voltage/current (impedance) profile of the antenna. The affect can also be influenced with how wet or dry is the bark of the tree. There was an article years ago about the US Military using living trees as vertical antennas... not overwhelming results if I remember correctly....

72,
Bruce - KK0S

--- In 4sqrp@..., Nick-WA5BDU wrote:
>
> My antenna wires touch tree limbs all the time. That shouldn't cause
> you any problems.
>
> 72,
>
> Nick, WA5BDU
>
> On 3/10/2013 7:20 PM, Dg Arnholt wrote:
> > kinda thought it was that. still the kenwood shuting down is a
> > mystery..i didnt think it had swr shut down.. hope the finals are ok.
> > oh yeah the antenna problem simple :) wire touching a tree..gonna get
> > a rope and pull it off and in the future get some help to move the
> > antenna leg. i would cut the tree but this is rental property
> >
> > <http://groups.yahoo.com/group/4sqrp/post;_ylc=X3oDMTJwMGdzcWM5BF9TAzk3MzU5NzE0BGdycElkAzg3MDE2MjU2BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NDUEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzYyOTYxMjIz?act=reply&messageNum=645>
> >
> >
> >
> >
> >
>


Nick-WA5BDU
 

Well, of course you'll get different opinions from different people and this is just mine.� Some folks think the antenna will set the tree on fire!

I've had both insulated and bare wires in contact with limbs, leaves, etc.� Hard to do otherwise on my lot if you want an antenna of any length.� Sometimes the limbs or trunk will even grow around the wire.� I guess it's possible there's some signal loss, but I don't think it's significant.

On VHF and FM broadcast, there's no doubt that summer foliage degrades reception in fringe areas.�� But being fringe probably means the signal is passing through *lots* of vegetation on the way.� I haven't seen any authoritative info to say that this is an issue at HF.

73-

Nick, WA5BDU



On 3/11/2013 9:42 PM, Todd F. Carney / K7TFC wrote:
�

On Mon, Mar 11, 2013 at 6:53 PM, Nick-WA5BDU�<nick-wa5bdu@...>�wrote:

My antenna wires touch tree limbs all the time.� That shouldn't cause you any problems.

Does it make a difference if the wire is insulated or bare when it touches trees?
�
73,

Todd
------------------------------------------------------------------------------------
K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
------------------------------------------------------------------------------------
QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design




72,

Nick, WA5BDU

On 3/10/2013 7:20 PM, Dg Arnholt wrote:
�
kinda thought it was that. still the kenwood shuting down is a mystery..i didnt think it had swr shut down.. hope the finals are ok.�
oh yeah the antenna problem simple :) wire touching a tree..gonna get a rope and pull it off and in the future get some help to move the antenna leg. i would cut the tree but this is rental property








Cliff Fox (KU4GW)
 

I saw 2 guys do that at ARRL Field Day one year and bring up the local 2 meter repeater for a short QSO off of a small tree. Pretty wild!

73, Cliff - KU4GW

--- In 4sqrp@..., w2bpi1@... wrote:

One of the ham mags had a article about using a tree as a vertical. Don't
remember the issue or what the conclusion was. Must not have been good or
guys would be using it for portable work! 72 Geo/W2BPI


In a message dated 3/12/2013 5:47:14 A.M. Eastern Daylight Time,
bbarley48@... writes:




- I think the answer here might be, "Yes - but..." Even at QRP power
levels, there can be varying amounts of interplay depending on where the tree is
touching the antenna along the voltage/current (impedance) profile of the
antenna. The affect can also be influenced with how wet or dry is the bark
of the tree. There was an article years ago about the US Military using
living trees as vertical antennas... not overwhelming results if I remember
correctly....

72,
Bruce - KK0S

--- In _4sqrp@... (mailto:4sqrp@...) , Nick-WA5BDU
<nick-wa5bdu@> wrote:

My antenna wires touch tree limbs all the time. That shouldn't cause
you any problems.

72,

Nick, WA5BDU

On 3/10/2013 7:20 PM, Dg Arnholt wrote:
kinda thought it was that. still the kenwood shuting down is a
mystery..i didnt think it had swr shut down.. hope the finals are ok.
oh yeah the antenna problem simple :) wire touching a tree..gonna get
a rope and pull it off and in the future get some help to move the
antenna leg. i would cut the tree but this is rental property

<_http://groups.yahoo.com/group/4sqrp/post;_ylc=X3oDMTJwMGdzcWM5BF9TAzk3MzU5NzE0BGdycElkAzg3MDE2MjU2BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NDUEc2VjA2Z0
cgRzbGsDcnBseQRzdGltZQMxMzYyOTYxMjIz?act=reply&messageNum=645_
(http://groups.yahoo.com/group/4sqrp/post;_ylc=X3oDMTJwMGdzcWM5BF9TAzk3MzU5NzE0BGdycElkAz
g3MDE2MjU2BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2NDUEc2VjA2Z0cgRzbGsDcnBseQRzdG
ltZQMxMzYyOTYxMjIz?act=reply&messageNum=645) >
>


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