108FB014
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Registered: 11-2011
Location: Glasgow
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Sirio dipole
What a pile of crap. very very hard to tune cant get a swr under 1.7. put outside on the balcony and swr goes to 3+ spend another hour tunning it cant get swr under 1.9 then put it in loft = 3+. rubbish
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15/Nov/2011, 1:05 pm
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yamanx1
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Registered: 09-2007
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Re: Sirio dipole
I never had any problems with mine?
All I did was to closely follow the dimensions given in the instructions and it was bang on from the off. My 5 ele beam I use now still has the same gamma match from that dipole 
Assuming you are using the SY27 model?
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By all means think yourself big, but never think others small.... R.F.Scott |
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15/Nov/2011, 1:23 pm
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108FB014
Freebander
Registered: 11-2011
Location: Glasgow
Posts: 16
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Re: Sirio dipole
Yep sy27. Think im just having a bad day to be honest. to much testorone i think. Anyway my brother is coming to help me errect it tomorow. his words * you have no patiance ill help you tomorow * so must be true lol
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15/Nov/2011, 2:52 pm
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Hot Fusion
Management
Registered: 03-2008
Location: South West England
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Re: Sirio dipole
(Moved to antenna section - hope you don't mind. )
I'd say it is a measurement issue, as a gamma match is pretty versatile at matching unless something's a long way out.
Let us know how you get on.
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Andy - FB107
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17/Nov/2011, 5:43 pm
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topbuzzuk
Big Cheese
Registered: 11-2007
Location: Wiltshire, UK
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Re: Sirio dipole
could be the balcony railings if they are metal effecting the swr, also double check the coax and plugs
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26FB118
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20/Nov/2011, 1:50 am
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Hot Fusion
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Registered: 03-2008
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Re: Sirio dipole
Yep, coax and plugs.
Always forget to mention that.
You will never get a good SWR if there are reflections coming back from a crappy connection.
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Andy - FB107
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20/Nov/2011, 10:59 am
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mikefox whiskey
Accomplished DX-er
Registered: 02-2009
Location: Northern Ireland
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Re: Sirio dipole
I had one up to for a while with no problems, swr was low from the offset, I even moved the gamma to see the difference and it was very easy to get the SWR down again.
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20/Nov/2011, 9:14 pm
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henry hpsd
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Registered: 02-2010
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Re: Sirio dipole
Hello,
The objects in the direct enviroment have most certainly influences.
Besideds that...there migth be another thing.
A gamma-match is normally used to adjust impedances below 50 ohms up towards that 50 ohms.
A very commen mistake is that people think a dipole has a 75 ohm impedance (or 50 ohms).
The impedance of a dipole can be from almost 0 upto about 100 ohms depending on the heigth above ground.
That migth also be of influence.
You could verify that by just placing the dipole at a different heigth
(or polarisation).
Kind regards,
Henry 19SD348
www.dx-antennas.com
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4/Dec/2011, 8:20 pm
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topbuzzuk
Big Cheese
Registered: 11-2007
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Re: Sirio dipole
did you ever try the dipole horizontal patrick?
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26FB118
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4/Dec/2011, 9:01 pm
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mikefox whiskey
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Re: Sirio dipole
I did Paddy, it worked okay but when I had it horizontal it was only about 15ft off the ground, my Imax worked better, I think realistically the dipole should be up as high as physically possible to get the benefit of it, a full wave up anyway, if it was it probably could of equaled the imax or perhaps bettered it on DX.
Last edited by mikefox whiskey, 4/Dec/2011, 9:11 pm
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(Forum user name is now SuperNasty)
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4/Dec/2011, 9:08 pm
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