Full wave 80 m Delta Loop

[Gordon KF6QKA]

I just installed a horizontal 80 meter delta loop. 270 total, 90 ft on a
side and app. 30 ft above ground. Fed with 1:1 Balun at one of the
vertex and rg-8u coax. The ant. is made with 14 guage insulated wire.

Best match on 80 meters is 2.5:1 @ 3.636 and 3:1 @ 3.536 and 3.613 only
an 82 khz window.

Question are:

1) Any ideas on what I should try to lower the match and increase the
usable window of the band?

2) How can I get better matches on 10-40 meters???

Appreciate your input.

Tnx de KF6QKA

Gordon in Oakland CA

[John Dewey]

My set up is very similar. 3 sides, 210 feet long, 30 feet high on good
side, 20 feet on other two sides.

I use 300 ohm TV line and a tuner. It work from 160 to 10.

KA9CAR

Gordon KF6QKA wrote in message <36D23B57...@inreach.com>...

[Bob Snyder]

Try feeding it with a 1/4 wave electrical length of 75 ohm coax and then any
length of 50 ohm.

73,
de Bob
KB0YGD

[John Cramond]

In article <36D23B57...@inreach.com>, Gordon KF6QKA
<gbr...@inreach.com> writes

>I just installed a horizontal 80 meter delta loop. 270 total, 90 ft on a
>side and app. 30 ft above ground. Fed with 1:1 Balun at one of the
>vertex and rg-8u coax. The ant. is made with 14 guage insulated wire.
>
>Best match on 80 meters is 2.5:1 @ 3.636 and 3:1 @ 3.536 and 3.613 only
>an 82 khz window.
>
>Question are:
>
>1) Any ideas on what I should try to lower the match and increase the
>usable window of the band?
>

Can you move the supports to change the position of the feed point?
I have the following set up which works great: One leg 123 feet, one leg
95 feet and one 42 feet long. I feed between the 42 feet and the 95 feet
legs where an obtuse angle is formed by the wire.
Results are 2.0:1 at 3.8, 1:1 AT 3.7 AND 2.2:1 3.6. I did try a 1:1 and
a 2:1 balun but eventually settled for a 20m length of 75 ohm coax
between the antennae and the 50 ohm coax to the shack. Everyone remarks
on the strength of my signal with this set up. I can never decide
whether to call it a full wave delta loop or a folded dipole!

>2) How can I get better matches on 10-40 meters???
>

Doubt if you will be able to do a great deal to improve matching on
these bands, but I find the inbuilt tuner will match the rig to this
antennae on all bands up to 10m.

>Appreciate your input.
>
>Tnx de KF6QKA
>
>Gordon in Oakland CA
>

--
John Cramond - GM4NHI
<jo...@gm4nhi.demon.co.uk>
Home Page - X7 Review: www.gm4nhi.demon.co.uk

[dw]

My delta is about 120 horizontal top, split in center with 450 ladder
shorted stub about 30'. Feed in in center of bottom of the V with a
current 4:1 balun. I use 100' of low loss coax. Tunes easy
on all bands except for the edges of 160. You may want to try
a longer length of coax.

Best,
Duane

>
>Gordon KF6QKA wrote in message <36D23B57...@inreach.com>...

>>I just installed a horizontal 80 meter delta loop. 270 total, 90 ft on a
>>side and app. 30 ft above ground. Fed with 1:1 Balun at one of the
>>vertex and rg-8u coax. The ant. is made with 14 guage insulated wire.
>>
>>Best match on 80 meters is 2.5:1 @ 3.636 and 3:1 @ 3.536 and 3.613 only
>>an 82 khz window.
>>
>>Question are:
>>
>>1) Any ideas on what I should try to lower the match and increase the
>>usable window of the band?
>>

>>2) How can I get better matches on 10-40 meters???
>>

[Ken Bickel]

Have you tried your antenna without the balun? Supposedly one is not
needed.

73

John Cramond wrote in message <7CClgCAs...@gm4nhi.demon.co.uk>...

>In article <36D23B57...@inreach.com>, Gordon KF6QKA
><gbr...@inreach.com> writes

>>I just installed a horizontal 80 meter delta loop. 270 total, 90 ft on a
>>side and app. 30 ft above ground. Fed with 1:1 Balun at one of the
>>vertex and rg-8u coax. The ant. is made with 14 guage insulated wire.
>>
>>Best match on 80 meters is 2.5:1 @ 3.636 and 3:1 @ 3.536 and 3.613 only
>>an 82 khz window.
>>
>>Question are:
>>
>>1) Any ideas on what I should try to lower the match and increase the
>>usable window of the band?
>>
>

>Can you move the supports to change the position of the feed point?
>I have the following set up which works great: One leg 123 feet, one leg
>95 feet and one 42 feet long. I feed between the 42 feet and the 95 feet
>legs where an obtuse angle is formed by the wire.
>Results are 2.0:1 at 3.8, 1:1 AT 3.7 AND 2.2:1 3.6. I did try a 1:1 and
>a 2:1 balun but eventually settled for a 20m length of 75 ohm coax
>between the antennae and the 50 ohm coax to the shack. Everyone remarks
>on the strength of my signal with this set up. I can never decide
>whether to call it a full wave delta loop or a folded dipole!
>

>>2) How can I get better matches on 10-40 meters???
>>
>

>Doubt if you will be able to do a great deal to improve matching on
>these bands, but I find the inbuilt tuner will match the rig to this
>antennae on all bands up to 10m.
>

>>Appreciate your input.
>>
>>Tnx de KF6QKA
>>
>>Gordon in Oakland CA
>>
>