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Gary DeBock
Hi Tony, Russ and Farmerik,
These are very interesting comments, especially Tony's Afro-comb suggestion
:-)
I've had good DXing results with 3/8" spacing on the PVC loops up to about
the 4' (side) size, but since it's easy to use wider spacing when there aren't
so many coil turns, 3/5" spacing was used for most of the larger loops here.
With only 4 coil turns on the 9' PVC loop, it was easy to cut 1"
spacing, which still made the pipe length only about 6".
The problem with wide spacing on the smaller loops is that your
loop spreads out excessively, working against the compact design objective.
If you really want better DXing performance from a tuned passive loop,
it's probably better to move up to a larger loop, rather than trying to
increase the spacing between the coil turns.
73, Gary
In a message dated 2/15/2010 1:46:51 P.M. Pacific Standard Time,
farmerik@... writes:
toggle quoted message
Show quoted text
Great idea! 3/8th inch might be good up to a 2 foot loop or so. That is
just a guess, not certain. I have thought of using peg board for one inch
spacing. - FARMERIK
--- In ultralightdx@yahoogroups.com,
"Tony King" wrote:
>
> In making spreaders for
Loops I've found a great answer. Those Afro hair
> combs - you know with
the long tines -about 8 of them with a flat handle. $2
> shop stuff. Cut
the tines (carefully) with pliers to about 1 inch. Screw the
> handle to
your loop arm, wire it up and then hotmelt glue the wire to the
>
spreader. Taught forever. The spacing of the tines makes the wire
spacing
> about 3/8th of an inch - ideal I have read.
>
>
Tony King
> Greytown NZ
>
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|
In making spreaders for Loops I've found a great answer. Those Afro hair
combs - you know with the long tines -about 8 of them with a flat handle. $2
shop stuff. Cut the tines (carefully) with pliers to about 1 inch. Screw the
handle to your loop arm, wire it up and then hotmelt glue the wire to the
spreader. Taught forever. The spacing of the tines makes the wire spacing
about 3/8th of an inch - ideal I have read.
Tony King
Greytown NZ
|
|
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Russ Edmunds <wb2bjh@...>
I think I'd be inclined to use something a bit less permanent than hot melt glue, just in case you have to rewire the thing at some point..
Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
|
--- On Mon, 2/15/10, Tony King wrote:
From: Tony King
Subject: [ultralightdx] Loop Wire Spreaders
To: ultralightdx@...
Date: Monday, February 15, 2010, 4:37 PM
In making spreaders for Loops I've found a great answer. Those Afro hair
combs - you know with the long tines -about 8 of them with a flat handle. $2
shop stuff. Cut the tines (carefully) with pliers to about 1 inch. Screw the
handle to your loop arm, wire it up and then hotmelt glue the wire to the
spreader. Taught forever. The spacing of the tines makes the wire spacing
about 3/8th of an inch - ideal I have read.
Tony King
Greytown NZ
|
|
|
Great idea! 3/8th inch might be good up to a 2 foot loop or so. That is just a guess, not certain. I have thought of using peg board for one inch spacing. - FARMERIK
toggle quoted message
Show quoted text
--- In ultralightdx@..., "Tony King" <tonyzl@...> wrote:
In making spreaders for Loops I've found a great answer. Those Afro hair
combs - you know with the long tines -about 8 of them with a flat handle. $2
shop stuff. Cut the tines (carefully) with pliers to about 1 inch. Screw the
handle to your loop arm, wire it up and then hotmelt glue the wire to the
spreader. Taught forever. The spacing of the tines makes the wire spacing
about 3/8th of an inch - ideal I have read.
Tony King
Greytown NZ
|
|
|
Russ Edmunds <wb2bjh@...>
That depends on whether you're speaking of a tuner AM only loop or a broadband loop. On the latter, spacing wouldn't be critical.
For a 2' loop, the ideal spacing would be about 3/8, perhaps a bit less. For a 4' loop, 1/2 is better.
Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
|
--- On Mon, 2/15/10, farmerik wrote:
From: farmerik
Subject: [ultralightdx] Re: Loop Wire Spreaders
To: ultralightdx@...
Date: Monday, February 15, 2010, 4:43 PM
Great idea! 3/8th inch might be good up to a 2 foot loop or so. That is just a guess, not certain. I have thought of using peg board for one inch spacing. - FARMERIK
--- In ultralightdx@ yahoogroups. com, "Tony King" wrote:
>
> In making spreaders for Loops I've found a great answer. Those Afro hair
> combs - you know with the long tines -about 8 of them with a flat handle. $2
> shop stuff. Cut the tines (carefully) with pliers to about 1 inch. Screw the
> handle to your loop arm, wire it up and then hotmelt glue the wire to the
> spreader. Taught forever. The spacing of the tines makes the wire spacing
> about 3/8th of an inch - ideal I have read.
>
> Tony King
> Greytown NZ
>
|
|
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Russ Edmunds <wb2bjh@...>
Sorry - I meant "tuned" not "tuner".
Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
|
--- On Mon, 2/15/10, Russ Edmunds wrote:
From: Russ Edmunds
Subject: Re: [ultralightdx] Re: Loop Wire Spreaders
To: ultralightdx@...
Date: Monday, February 15, 2010, 5:07 PM
That depends on whether you're speaking of a tuner AM only loop or a broadband loop. On the latter, spacing wouldn't be critical.
For a 2' loop, the ideal spacing would be about 3/8, perhaps a bit less. For a 4' loop, 1/2 is better.
Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
--- On Mon, 2/15/10, farmerik wrote:
From: farmerik
Subject: [ultralightdx] Re: Loop Wire Spreaders
To: ultralightdx@ yahoogroups. com
Date: Monday, February 15, 2010, 4:43 PM
Great idea! 3/8th inch might be good up to a 2 foot loop or so. That is just a guess, not certain. I have thought of using peg board for one inch spacing. - FARMERIK
--- In ultralightdx@ yahoogroups. com, "Tony King" wrote:
>
> In making spreaders for Loops I've found a great answer. Those Afro hair
> combs - you know with the long tines -about 8 of them with a flat handle. $2
> shop stuff. Cut the tines (carefully) with pliers to about 1 inch. Screw the
> handle to your loop arm, wire it up and then hotmelt glue the wire to the
> spreader. Taught forever. The spacing of the tines makes the wire spacing
> about 3/8th of an inch - ideal I have read.
>
> Tony King
> Greytown NZ
>
|
|
|
|
Russ Edmunds <wb2bjh@...>
Not only that, but as you add space, you add distributive capacitance to the circuit, which may, under certain circumstances cause you to lose tuning for the whole band and/or distort the directioal pattern.
Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id
FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot
|
--- On Mon, 2/15/10, D1028Gary@... wrote:
From: D1028Gary@...
Subject: Re: [ultralightdx] Re: Loop Wire Spreaders
To: ultralightdx@...
Date: Monday, February 15, 2010, 6:01 PM
Hi Tony, Russ and Farmerik,
These are very interesting comments, especially Tony's Afro-comb suggestion
:-)
I've had good DXing results with 3/8" spacing on the PVC loops up to about
the 4' (side) size, but since it's easy to use wider spacing when there aren't
so many coil turns, 3/5" spacing was used for most of the larger loops here.
With only 4 coil turns on the 9' PVC loop, it was easy to cut 1"
spacing, which still made the pipe length only about 6".
The problem with wide spacing on the smaller loops is that your
loop spreads out excessively, working against the compact design objective.
If you really want better DXing performance from a tuned passive loop,
it's probably better to move up to a larger loop, rather than trying to
increase the spacing between the coil turns.
73, Gary
In a message dated 2/15/2010 1:46:51 P.M. Pacific Standard Time,
farmerik@cox. net writes:
Great idea! 3/8th inch might be good up to a 2 foot loop or so. That is
just a guess, not certain. I have thought of using peg board for one inch
spacing. - FARMERIK
--- In ultralightdx@ yahoogroups. com,
"Tony King" wrote:
>
> In making spreaders for
Loops I've found a great answer. Those Afro hair
> combs - you know with
the long tines -about 8 of them with a flat handle. $2
> shop stuff. Cut
the tines (carefully) with pliers to about 1 inch. Screw the
> handle to
your loop arm, wire it up and then hotmelt glue the wire to the
>
spreader. Taught forever. The spacing of the tines makes the wire
spacing
> about 3/8th of an inch - ideal I have read.
>
>
Tony King
> Greytown NZ
>
|
|
|
