[SJDXA] FW: West Creek Array Issues and Install

[Bob Schenck N2OO]

SJDXA members;

Work Party reminder. See below. John has asked for help tomorrow at the site
(Sunday).

Meet time 9:00 AM

We should have a nice day.

(I have a prior commitment to attend an Eagle Scout court of honor and will
have to leave early (10am) , but I will be there at 9am with ARP and Gerry
W1GD to test the Acom 2S1 with 2 K3's and one amp (will use the AL811H).
We'll do it on 80 or 40 I guess.)

Also, we can run the same test using a K3 and our MKV. Should work as well.

 

Yes, I have an extra screw anchor.

 

Bob W2ARP maybe you can set the shack up for testing the two 160 antennas
(see below) with the MKV or with Gerry's K3. I'll be bringing mine back home
after we run the 2S1 test.

 

 

See ya' in the Pileups!

73!

Bob Schenck, N2OO

President SJDXA

GO SJDXA!!! www.sjdxa.org

 

From: John Crovelli [mailto:w2gd at hotmail.com] 
Sent: Saturday, November 12, 2011 1:24 PM
To: w1gd at aol.com; K2TW; Marty Grozinski; N2OO; N2HM
Subject: RE: West Creek Array Issues and Install
Importance: High

 

I gather the top element of each sloper is supposed to be spaced roughly 20
feet from the loop at least the NE works out to be this distance.
 
MARTY and BOB:  note 1GD's comments about placement of the NE element tieoff
point out in the marsh - 50 feet further out per his geometry
exercise.....do we have another screw in anchor to put out there?
 
So it would follow the West sloper should be the same distance from the
loop.  But since the loop is further away on the opposite side of the tower,
I would seem to me the length of the leader rope attached to the West  pull
up rope should be somewhat shorter, instead of 30 feet, maybe 15 to 20 feet,
to maintain the correct West element spacing relative to the loop.   The
height of the element does not have to be the exactly the same as the NE
element...eg. 208 feet.  It can be a little higher without issues I think.
 
Feedline extensions are made and tested and in my car.  
 
Lets mount some small pulleys at 30 feet with closed loop ropes to allow
easy lowering/adjustment of the bottom of the driven elements.  As 1GD
pointed out we don't want to be climbing in the winter cold just for a minor
tweak. 
 
Looks like we need at least two additional 100 foot runs of nylon rope.  If
you have rope .... bring it.
 
BOB, we'll need at least one if not TWO SJDXA guys out in the swamp to help
with  the TX antenna install.  Hope Randy is available...maybe Bob too.
 
SEE all at 9 am.  tomorrow.
 
Bob, if you could set up the shack for testing antennas with the FT1000 that
would be very good.....maybe set it up with a coax switch to make it easy to
switch back and forth.between the two yagis.
 
2GD/3
 
 
 
 

  _____  

To: w2gd at hotmail.com; k2tw at arrl.net; w2cg at comcast.net
Subject: West Creek Array
From: w1gd at aol.com
Date: Sat, 12 Nov 2011 10:13:05 -0500

As promised, these are "important" measurements (used in the modeling) for
the loop/sloper installation:

 

Loop:  

Top is up 230 feet and 2 feet away from the tower.  (Reality is that we can
pull the top pretty much up to the pulley on the new yard arm.)

 

          

Bottom is up around 69 feet and approximately 18 feet from the tower.
(Note, we're not changing the shape or dimensions of the existing loop.  We
will have to get the loop over the 5th level of guys.  I think this will
take some work to raise the loop with the base open and then lower the loop
enough to close up the loop base.)

 

NE Sloper:

Top is up at 208 feet (i.e., 22 feet below the top of the loop) and out
about 24 feet from the tower.  I think we need a 30 foot rope from the top
of the loop to the sloper insulator to make this work.

 

Bottom should be about 23 feet up although we may want to try it at a more
easily manageable height like 8-10 feet for adjustments.

 

We need to move the far en anchor point at least 40 feet further out (50
feet would be better) to make the geometry work.  This means moving the
anchor or putting in a new one.

 

W Sloper

Top is at 208 feet (same level as NE sloper) and 20 feet from the tower.

 

Bottom should be about 23 feet up (or same as NE sloper)

 

I'm sure we'll need a new anchor point for the far rope.  From what I recall
of the trees out therre, this could be our biggest obstacle.

 

See you all Sunday morning.

 

Gerry, W1GD

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