Sorry for ignoring the recommendation but I could not resist.
The measurements are on 6m. Assuming that we use a ladderline-fed dipole up
to 30m (a beam for 20m up), the feeder is nearly vertical so that most of
the water runs down, and a KW (not on 10MHz) vaporizes some of the water,
there may
Sorry for an off-topic question. Does anyone have any information about the
dry vs wet characteristics of 450 ohm ladder line? I have never used this
type of line, but I might have to use it for mechanical reasons to feed
another antenna now being built. I am told that its characteristics
N7WS took a look at precisely this subject:
http://users.triconet.org/wesandlinda/ladder_line.pdf
BTW I use 450 ohm ladder line here to feed a c.f. vertical wire
doublet for multi-band operation using a balanced tuner - at least
when dry, it's the best option to keep loss low and for mechanical
I find the antenna system loses a *lot* of its effectiveness when the
ladder line is wet. As a guess I'd say a half or more of the received
signal strength is lost (and , I suppose, similarly for transmit) when
the line is wet..
When not wet its a very effective component in my antenna system.
I find the antenna system loses a *lot* of its effectiveness when the
ladder line is wet.
IMO, construction of open-feeder line is worth the effort. I am using an
old stash of E.F. Johnson spreader insulators, but effective balanced line
can be made by using PVC tubing, with the ends sliced
really have to bite my tongue.
Wes N7WS
--- On Tue, 3/17/09, Bob Cunnings bob.cunni...@gmail.com wrote:
From: Bob Cunnings bob.cunni...@gmail.com
Subject: Re: [Elecraft] OT Wet 450 ohm ladder line
To: Elecraft Discussion List elecraft@mailman.qth.net
Date: Tuesday, March 17, 2009, 8:35 AM
I use open wire feeder for my center-fed antenna. It is #14 wire separated
by plastic 4-inch spacers. It is effective and does not lose much, if
anything, when wet.
Monty K2DLJ
I find the antenna system loses a *lot* of its effectiveness when the
ladder line is wet. As a guess I'd say a
Open wire line changes a bit in wet weather due to moisture on the
insulation between the wires. The worst is the type with a continuous web of
insulation that was commonly used for television lead-in before coax came
into common use. Next best is window line what is the same basic
insulation, but
,
Phil, NS7P
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net]on Behalf Of Monty Shultes
Sent: Tuesday, March 17, 2009 8:14 AM
To: w2bvh; gm4...@btinternet.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT Wet 450 ohm ladder line
I use
Geoffrey Mackenzie-Kennedy wrote:
Sorry for an off-topic question. Does anyone have any information about the
dry vs wet characteristics of 450 ohm ladder line? I have never used this
type of line, but I might have to use it for mechanical reasons to feed
another antenna now being built. I
Many thanks for all the comments about wet 450 ohm ladder line.
There is no doubt in my mind about open wire line being the better choice,
and I would normally use it. But in this particular application there is the
risk of open wire line being damaged by or ensnarled in a fairly dense
growth
: Geoffrey Mackenzie-Kennedy gm4...@btinternet.com
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Tuesday, March 17, 2009 12:23 PM
Subject: Re: [Elecraft] OT Wet 450 ohm ladder line
Many thanks for all the comments about wet 450 ohm ladder line.
There is no doubt in my mind about
Let's let this thread rest for now. :-)
73, Eric WA6HHQ
Elecraft List Moderator
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Post:
On Tue, 17 Mar 2009 08:13:12 -0700 (PDT), Wes Stewart wrote:
Indeed I did. However, a few more words. The experiments that I
ran were by necessity somewhat contrived and weren't very
repeatable. What I was attempting to show was that there can be a
detrimental effect when these lines become
- Original Message -
From: Paul Christensen w...@arrl.net
To: Elecraft Discussion List elecraft@mailman.qth.net
Sent: Tuesday, March 17, 2009 8:12 AM
Subject: Re: [Elecraft] OT Wet 450 ohm ladder line
And my vote for the best all purpose HF antenna of all
time. Nearly an
entire
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