Long delayed response to
http://lists.contesting.com/pipermail/topband/2013-August/041954.html
K2AV wrote:
"By common
expectation LPL and LR should have a propagation advantage over NY4A.
LPL and LR both have excellent stacked 3 or 4 element 40m yagi's. But
note how as the fourth mode i
It's very handy to have a close-by RBN node that can hear us on 160 in
the daytime. This allows us to evaluate our signal independent of
night-time variations in propagation. Note that the figure is signal
to noise, not signal strength. So sometimes we will have a varying
signal to noise report,
Mike,
Thanks for the info on RBN. I am learning how to navigate thru RBN
also. Very helpful.
Bob
K6UJ
On Aug 10, 2013, at 5:11 PM, Mike Waters wrote:
> I'm not sure if there's a tutorial, but let me see if we call help a
> little. Since I probably have cookies saved from using them, you may
"
On Sat, Aug 10, 2013 at 7:47 PM, wrote:
>
> I haven’t used the RBN. Guess I need to figure out how so as to quantify the
> performance of what I have up.
>
> Is there a tutorial on the site?
I don't think so but go to "DX spots", then "spots analysis tool".
Then select a date (e.g. 02/16/20
I'm not sure if there's a tutorial, but let me see if we call help a
little. Since I probably have cookies saved from using them, you may
experience something a little different.
Click http://www.reversebeacon.net/main.php.
NO, better yet, try http://www.reversebeacon.net/dxsd1/ instead . You
sho
of trees- tree appreciation
W8JI wrote:
> My gut feeling is
the one that looks the best and takes the most work will make you feel like
you have the best signal you ever had, but no one else will notice the
change except you unless you tell them about all the work or they "like"
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Bill
Tippett
Sent: Saturday, August 10, 2013 1:20 PM
To: topband@contesting.com
Subject: Re: Topband: Effect of trees- tree appreciation
W8JI wrote:
> My gut feeling is
the one
This is a VERY profound piece of advice!
The RBN showed me that something was definitely wrong with my TX signal
level this summer. It was considerably down from several other stations not
that far away, even with 1500 watts. And it wasn't like that at all at
first; before the foliage started grow
W8JI wrote:
> My gut feeling is
the one that looks the best and takes the most work will make you feel like
you have the best signal you ever had, but no one else will notice the
change except you unless you tell them about all the work or they "like" a
particular antenna you are using.
K2XT r
Thank you all for the replies regarding the "T" versus "L" rebuild for my 160
antenna. I'm on a 120x120' city lot in Fairbanks. For fun look me up in QRZ,
under 'Detail' zoom in for a satellite view via Google, then switch to a street
view to see the trees. The motorhome is gone, the motorcycle
Here is a little data in a sea of complexity:
My 160m T is 10' up at the base with 6 x 125' radials elevated ten feet
(4 more planned), in a mixed hemlock/red cedar/alder forest/clear area.
The top is at 87' and the T arms are 42' each side at the same height.
The vertical wire (13ga insulat
W8JI says:
>My gut feeling is
> the one that looks the best and takes the most work will make you feel like
> you have the best signal you ever had, but no one else will notice the
> change except you
This is a a very significant statement when you think about it.
Ask anyone you talk to on th
On 8/10/2013 6:28 AM, Tom W8JI wrote:
This is a good example where the problem of not quantifying things
comes in. No one here knows what the typical loss or interation is,
and it is probably impossible to know what the extact interation is in
every situation.
Yes, and that's exactly why thos
Where are the high voltage points in a "T" antenna?
The highest voltage is generally at the open end, but how high that voltage
is depends on the boundary area between the antenna and whatever is around
the antenna.
The slippery slope here is that people might think only the very ends have
On 8/9/2013 9:31 PM, Gary and Kathleen Pearse wrote:
Where are the high voltage points in a "T" antenna?
The end of an antenna (for example, at the end insulator of a wire
antenna) MUST be a current minimum (near zero) because there is no place
for it to go except by capacitance to space or s
Where are the high voltage points in a "T" antenna?
I have the choice of putting up either a new T between two trees, or an L again
on 160M. The ends of the T would by necessity be strung over and go down 20-30'
alongside the two supporting trees.
The L would parallel a tree and bend over at
I expect the losses are related to current not voltage. The current of my
antenna is in the vertical section for the most part and loss would would
have to happen there as coupled to the nearest tree. The current would have
to flow to ground so I seriously doubt if the resistance of the trunk is
On 08/09/2013 04:51 PM, Charlie Cunningham wrote:
As a DXer, I generally listened a lot, and I found that on 160, if I
could hear them - more often than not, I could work 'em - wherever in the
world they might be.
No receive antennas? With 1500 watts into a 100 foot vertical (tower
with 7 elem
oun...@contesting.com] On Behalf Of Greg
Chartrand
Sent: Friday, August 09, 2013 4:21 PM
To: topband@contesting.com
Subject: Re: Topband: Effect of trees- tree appreciation
I expect the losses are related to current not voltage. The current of my
antenna is in the vertical section for the most
I expect the losses are related to current not voltage. The current of my
antenna is in the vertical section for the most part and loss would would have
to happen there as coupled to the nearest tree. The current would have to flow
to ground so I seriously doubt if the resistance of the trunk
On 8/8/2013 10:09 AM, donov...@starpower.net wrote:
I caught a tree on fire at night because the end of my dipole was in some dead
tree branches!
One of the first antennas I hung when I moved here was a horizontal
dipole for 80 with loading coils for 160M, built with THHN. One end was
touchi
;Rick Stealey" ,
topband@contesting.com
Sent: Thursday, August 8, 2013 6:04:24 PM
Subject: Re: Topband: Effect of trees- tree appreciation
Different folks here have promulgated a "high voltage point loss" model for
antennas in trees. I think this could be a valid model for a do
Tom W8JI
Sent: Thursday, August 08, 2013 12:40 PM
To: Rick Stealey; topband@contesting.com
Subject: Re: Topband: Effect of trees- tree appreciation
>
> Just thinking here - I can hold my hand on a 75 watt lightbulb for a
> few seconds. 10 of those lightbulbs-worth of heat isn't ve
Just thinking here - I can hold my hand on a 75 watt lightbulb for a few
seconds. 10 of those lightbulbs-worth of heat isn't very much heat,
dissipated over the surface area of the bark of a tree, 60 feet tall, in
winter, with low temps, and maybe even some wind can't really have much in
t
> For them to make a significant impact on my ability to transmit, they would
> have to absorb at least 3db (750 watts).
So your loss is less than 3 db, and so it's of no concern to you?
I know 160 meter ops who would, and do, pay lots of money for an extra 3 db.
Say your tree loss was really
pband [mailto:topband-boun...@contesting.com] On Behalf Of Greg
Chartrand
Sent: Wednesday, August 07, 2013 5:51 PM
To: topband@contesting.com
Subject: Re: Topband: Effect of trees- tree appreciation
I love my trees. They have held up my 160 antennas at my QTH for the last 18
years. For them to m
I love my trees. They have held up my 160 antennas at my QTH for the last 18
years. For them to make a significant impact on my ability to transmit, they
would have to absorb at least 3db (750 watts). If any of them have absorbed
that amount of power, I suspect they would have gone up in flaming
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