Backyard antenna considered...
 

On May 23, 5:15*pm, wrote:
On Sun, 23 May 2010 16:58:44 -0700 (PDT), bpnjensen





wrote:
On May 23, 4:33*pm, dave wrote:
RHF wrote:
On May 22, 10:03 am, "John *wrote:
I have a wood fence around my back yard. Across the back stretch is 79 feet.
The fence extends 76 feet from there along each side of my house which is 50
feet wide, leaving around 14 feet on each side of the house. The back of the
house to the fence is 37 feet . The eve of my two story house is, if I
remember right, about 23 feet above the ground. I want to erect a random
wire antenna of insulated 12 gauge wire from one corner of the fence in the
back, lead it up to the middle of the house to an insulator, then back down
to the other corner of the fence, where the feedpoint will connect at the
end. The back of my house faces due North. The antenna will be held about 8'
feet off the ground at the fence corners by schedule 40 PVC pipe. I want to
juse the feeline system as described by John Doty in this article:http://www.hard-core-dx.com/nordicdx...eed/feed1.html
I have a Radio Shack DX-398 equivalent of the Sangean ATS-909. I was
thinking the two ground rods will be set in *a hole 1 foot in diameter
filled with a Bentonite slurry. I was wondering if the random wire folded
into such an inverted V facing due North will have good reception qualities.
The previous residence I erected an inverted L random wire antenna and
received excellent results, but seemed very directional. I am hoping the
inverted V shape will help diversify the direction of reception somewhat at
this house. What do you all think?

John Smith,

Consider using the Par Electronics End-Fed
Shortwave Listener's (EF-SWL) Antenna
http://groups.google.com/group/rec.r...68cb105b4a370b
http://groups.google.com/group/rec.r...11c0ac4f084b87
* .
Rig EF-SWL as an Inverted "L" Antenna starting
with a 15 Foot Vertical Up-Leg with a 30 Foot
Horizontal Out-Arm
http://groups.google.com/group/rec.r...f41e85486b0ed9
* .
SWL -Newbies- Installing an Inverted "L" Antenna : The Right-Way !
http://groups.google.com/group/rec.r...ca62e0c0e838ea
* .
All-Band Sloping Inverted "L" Antenna -by- Rolf Brevig [LA1IC]
http://groups.google.com/group/rec.r...0de363c21d19ba
* .
hope this helps - iane ~ RHF
* .

Center feed it at the apex with RG6. *Good to go. *Great antenna.

How do you center feed an inverted L or a PAR SWL? *This I gotta see!

He is talking about the original V shaped antenna that John described.
He is saying - split it in half and feed it at the top insulator with
coax instead of feeding it at the end with a balun.

Jim- Hide quoted text -

- Show quoted text -

I see - and the advantage is less directionality, like a dipole.

But if that is what you seek, then why not just end-feed the PAR and
set it up as a sloper with the fed end near the gournd and the far end
up high? That's what Dale recommends, and you still get more omni out
of it plys good noise isolation. No surgery required.

Either that or take some plain wire and do the split version. If I
got the PAR, I'd be hesitant to take a nice, slighlty pricey antenna
and chop-shop it.

Bruce

Backyard antenna considered...
 

John Smith wrote:
I have a wood fence around my back yard. Across the back stretch is 79 feet.
The fence extends 76 feet from there along each side of my house which is 50
feet wide, leaving around 14 feet on each side of the house. The back of the
house to the fence is 37 feet . The eve of my two story house is, if I
remember right, about 23 feet above the ground. I want to erect a random
wire antenna of insulated 12 gauge wire from one corner of the fence in the
back, lead it up to the middle of the house to an insulator, then back down
to the other corner of the fence, where the feedpoint will connect at the
end. The back of my house faces due North. The antenna will be held about 8'
feet off the ground at the fence corners by schedule 40 PVC pipe. I want to
juse the feeline system as described by John Doty in this article:
http://www.hard-core-dx.com/nordicdx...eed/feed1.html
I have a Radio Shack DX-398 equivalent of the Sangean ATS-909. I was
thinking the two ground rods will be set in a hole 1 foot in diameter
filled with a Bentonite slurry. I was wondering if the random wire folded
into such an inverted V facing due North will have good reception qualities.
The previous residence I erected an inverted L random wire antenna and
received excellent results, but seemed very directional. I am hoping the
inverted V shape will help diversify the direction of reception somewhat at
this house. What do you all think?



I have a 65' random wire located about 225 feet from my house with a 9:1
matching transformer at the antenna end, and roughly 300 feet of coax
running underground (in plastic conduit) between the antenna and the
house and then up and over across my attic before coming down the wall
where my radio is. There's a ground at the matching transformer, and
one at the house. I've got ferrites at each end too.

It's a wonderful antenna. My noise floor is incredibly low.

A concern I have with the antenna you're proposing is you're bringing
the antenna back to the house - where all the electrical noise you're
looking to avoid is located.

Your radio really doesn't need a big antenna. Design yours so you keep
the antenna as far from your house (and your neighbors homes) as
possible. 15-20 feet is probably plenty for that radio.

RFI strength goes down by a square of the distance. Put your antenna
twice as far away and you get 1/4 of the noise signal. Three times as
far away and you get 1/9 of the noise signal.

Something to consider is if you're even thinking about getting your ham
ticket some day, it's worth spending the money up front to use low loss
coax or heliax. My antenna is useless for tx, and digging up all that
pipe to replace my coax just isn't an attractive option.

Backyard antenna considered...
 

On May 24, 8:00*am, "Mark S. Holden" wrote:
John Smith wrote:
I have a wood fence around my back yard. Across the back stretch is 79 feet.
The fence extends 76 feet from there along each side of my house which is 50
feet wide, leaving around 14 feet on each side of the house. The back of the
house to the fence is 37 feet . The eve of my two story house is, if I
remember right, about 23 feet above the ground. I want to erect a random
wire antenna of insulated 12 gauge wire from one corner of the fence in the
back, lead it up to the middle of the house to an insulator, then back down
to the other corner of the fence, where the feedpoint will connect at the
end. The back of my house faces due North. The antenna will be held about 8'
feet off the ground at the fence corners by schedule 40 PVC pipe. I want to
juse the feeline system as described by John Doty in this article:
http://www.hard-core-dx.com/nordicdx...eed/feed1.html
I have a Radio Shack DX-398 equivalent of the Sangean ATS-909. I was
thinking the two ground rods will be set in *a hole 1 foot in diameter
filled with a Bentonite slurry. I was wondering if the random wire folded
into such an inverted V facing due North will have good reception qualities.
The previous residence I erected an inverted L random wire antenna and
received excellent results, but seemed very directional. I am hoping the
inverted V shape will help diversify the direction of reception somewhat at
this house. What do you all think?

I have a 65' random wire located about 225 feet from my house with a 9:1
matching transformer at the antenna end, and roughly 300 feet of coax
running underground (in plastic conduit) between the antenna and the
house and then up and over across my attic before coming down the wall
where my radio is. *There's a ground at the matching transformer, and
one at the house. *I've got ferrites at each end too.

It's a wonderful antenna. *My noise floor is incredibly low.

A concern I have with the antenna you're proposing is you're bringing
the antenna back to the house - where all the electrical noise you're
looking to avoid is located.

Your radio really doesn't need a big antenna. *Design yours so you keep
the antenna as far from your house (and your neighbors homes) as
possible. *15-20 feet is probably plenty for that radio.

RFI strength goes down by a square of the distance. *Put your antenna
twice as far away and you get 1/4 of the noise signal. *Three times as
far away and you get 1/9 of the noise signal.

Something to consider is if you're even thinking about getting your ham
ticket some day, it's worth spending the money up front to use low loss
coax or heliax. *My antenna is useless for tx, and digging up all that
pipe to replace my coax just isn't an attractive option.- Hide quoted text -

- Show quoted text -

Dang! I'd give my right arm for that much space to erect an antenna.

Backyard antenna considered...
 

bpnjensen wrote:
On May 24, 8:00 am, "Mark S. Holden" wrote:

I have a 65' random wire located about 225 feet from my house with a 9:1
matching transformer at the antenna end, and roughly 300 feet of coax
running underground (in plastic conduit) between the antenna and the
house and then up and over across my attic before coming down the wall
where my radio is. There's a ground at the matching transformer, and
one at the house. I've got ferrites at each end too.

It's a wonderful antenna. My noise floor is incredibly low.

A concern I have with the antenna you're proposing is you're bringing
the antenna back to the house - where all the electrical noise you're
looking to avoid is located.

Your radio really doesn't need a big antenna. Design yours so you keep
the antenna as far from your house (and your neighbors homes) as
possible. 15-20 feet is probably plenty for that radio.

RFI strength goes down by a square of the distance. Put your antenna
twice as far away and you get 1/4 of the noise signal. Three times as
far away and you get 1/9 of the noise signal.

Something to consider is if you're even thinking about getting your ham
ticket some day, it's worth spending the money up front to use low loss
coax or heliax. My antenna is useless for tx, and digging up all that
pipe to replace my coax just isn't an attractive option.- Hide quoted text -

- Show quoted text -

Dang! I'd give my right arm for that much space to erect an antenna.

It doesn't suck.

Before I had this one, my signal to noise level was a problem, even when
I did the horizontal loop.

But I really wish I'd used heliax.