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Bluebird
Intermediate Member
Username: Bluebird

Post Number: 125
Registered: 2-2004


Posted on Monday, January 18, 2010 - 6:28 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

which one of these is the correct way to install a 4 elm qubical quad
A or B,,it will be feed for vertical with a 1:1 balun. this is my new homebrew project so any sugestions will help,,thanks.
mitchell
bluebird
cef 398
cvc 113
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Patzerozero
Senior Member
Username: Patzerozero

Post Number: 4778
Registered: 7-2004


Posted on Tuesday, January 19, 2010 - 12:39 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

both ways feed the antenna vertically. to feed it horizontally, the feed would be at the bottom, where your coax in diagram is going down the mast, again in either form.
conventional thinking is diagram 'B' would shed snow & ice better then diagram 'A'. i think 'A' gives a smaller 'appearance' to the neighbors.
i found an mfj259b to be better then my old mfj259 in getting resonance & correct feedpoint impedance, even with 4 & 5 elements....2 & 3 elements was extremely difficult to get impedance matched as best swr was usually close to 2:1 without a matching section installed. direct feed with more elements is so much nicer.....
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Bluebird
Intermediate Member
Username: Bluebird

Post Number: 125
Registered: 2-2004


Posted on Tuesday, January 19, 2010 - 10:03 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

thanks pat,,iam going to go with diagram 'B'.
it will hold the balun on the spreader arm.
mitchell
bluebird
cef 398
cvc 113
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Bluebird
Intermediate Member
Username: Bluebird

Post Number: 128
Registered: 2-2004


Posted on Tuesday, January 26, 2010 - 10:46 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

does anyone have any plans to build a 1:1 current type balun?
mitchell
bluebird
cef 398
cvc 113
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Kf4gyp
Junior Member
Username: Kf4gyp

Post Number: 15
Registered: 11-2009


Posted on Friday, February 05, 2010 - 1:37 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi Bluebird
Try a 72" piece of of rg 6 75 ohm coax between the element feed point and youre 50 feed line to build a broad banded transformer. reg, tv stuff for up to 1000 watt or rg 11 for any other power you can afford aka.999,999,999,999,999 watts.
Now you wont have to ever worry about corona discharge on this antenna either.

The begining of the quad
http://lists.contesting.com/_towertalk/2002-11/msg00393.html
73 Ray/Hawk-Eye
DE KF4GYP
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Bluebird
Intermediate Member
Username: Bluebird

Post Number: 135
Registered: 2-2004


Posted on Friday, February 05, 2010 - 9:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

thanks KF4GYP,,I recently got a 1:1 balun but i will
try that also,,this antenna is new to me so any other ideas or suggestions would be appreciated.
mitchell
bluebird
cef 398
cvc 113
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Tecnicoloco
Intermediate Member
Username: Tecnicoloco

Post Number: 105
Registered: 4-2003


Posted on Thursday, February 11, 2010 - 2:25 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Check this old post

http://www.copperelectronics.com/discus4/messages/14/77662.html?1108837578
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Bluebird
Intermediate Member
Username: Bluebird

Post Number: 137
Registered: 2-2004


Posted on Thursday, February 18, 2010 - 2:32 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

just want to say thanks to everyone ,,I got the antenna finished..real good results.a SWR of 1:2
and 3 full s units on TX and 2 sunits on RX, over my 5/8 wave vertical.dx was booming today and made some nice contacts to the UK and one guy in florida.
mitchell
bluebird
cef 398
cvc 113

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