| Author |
Message |
    
Bluebird
Intermediate Member
Username: Bluebird
Post Number: 125
Registered: 2-2004
| | Posted on Monday, January 18, 2010 - 6:28 pm: | 
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 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
|
Patzerozero
Senior Member
Username: Patzerozero
Post Number: 4778
Registered: 7-2004
| | Posted on Tuesday, January 19, 2010 - 12:39 am: |
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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..... |
Bluebird
Intermediate Member
Username: Bluebird
Post Number: 125
Registered: 2-2004
| | Posted on Tuesday, January 19, 2010 - 10:03 am: |
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thanks pat,,iam going to go with diagram 'B'.
it will hold the balun on the spreader arm.
mitchell
bluebird
cef 398
cvc 113
|
Bluebird
Intermediate Member
Username: Bluebird
Post Number: 128
Registered: 2-2004
| | Posted on Tuesday, January 26, 2010 - 10:46 pm: |
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does anyone have any plans to build a 1:1 current type balun?
mitchell
bluebird
cef 398
cvc 113
|
Kf4gyp
Junior Member
Username: Kf4gyp
Post Number: 15
Registered: 11-2009
| | Posted on Friday, February 05, 2010 - 1:37 pm: |
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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: |
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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
|
Tecnicoloco
Intermediate Member
Username: Tecnicoloco
Post Number: 105
Registered: 4-2003
| | Posted on Thursday, February 11, 2010 - 2:25 am: |
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Check this old post
http://www.copperelectronics.com/discus4/messages/14/77662.html?1108837578 |
Bluebird
Intermediate Member
Username: Bluebird
Post Number: 137
Registered: 2-2004
| | Posted on Thursday, February 18, 2010 - 2:32 pm: |
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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
|
