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 Antenna tuning

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Haggis
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PostSubject: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 3:35 pm

Hi

I've been reading about checking antenna tuning. If you buy a decent Antenna would it still need to be tuned?
Hamish

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Alan Pilot
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 5:00 pm

As above all 11m antenna's need tuning not hard to do but you will need a SWR metre.
Unless it's a 

SQBM500P MkII .

Just having a laugh it's Sunday.
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Haggis
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 5:32 pm

Alan Pilot wrote:
As above all 11m antenna's need tuning not hard to do but you will need a SWR metre.
Unless it's a 

SQBM500P MkII .

Just having a laugh it's Sunday.

Sorry straight over my head !
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Alan Pilot
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 5:38 pm

Just winding our Martin up.
The SQBM500P MkII id a dual band 2m/70cm aerial comes pre-tuned.

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Alan Pilot
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 5:48 pm

NUBSTER wrote:
It's a dyslexic antenna LOL
Actually did wonder what you was on about at first
Are pictures better they are for me lol.
https://www.moonraker.eu/sqbm500p-mkii-dual-band-2-70-vertical-super-gainer-so239-3635
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Sydthecat
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 6:24 pm

Alan Pilot wrote:
As above all 11m antenna's need tuning not hard to do but you will need a SWR metre.



Unfortunately not true at all , not all 11m antennas need tuning but ANY antenna / install needs checking with a SWR meter 

Most 11m antennas come pre tuned and providing your coax and plugs are all in order then no tuning will be needed but I can’t stress enough how important it is to check everything out with a meter  

Craig
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Alan Pilot
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeSun Jan 31, 2021 6:57 pm

I agree with you Craig but i think we all have the urge to adjust fine tune them.
If you put a silver rod up what are the chances of a 1 to 1 swr.
You check the swr and in most cases you will adjust it so tune it sort of
I put a pre-tuned gainmaster up last year but wasn't happy with the swr so i altered it.
Can't think of any aerial i have ever put up that was spot on first go first was a dv27 in the mid 70s and yes on a biscuit tin top of the stairs.
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeWed Feb 03, 2021 1:13 pm

my sirio 4000 hp and 5000 performer in my try mag were checked from new and 1,2 and 1.3 so happy no cutting and happy they perform fantastically
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Alan Pilot
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeWed Feb 03, 2021 1:55 pm

I must admit they seem to be a lot better today than they where back in the late 70s early 80s.
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Northern Crusader
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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitimeWed Feb 03, 2021 2:37 pm

stephen Gunrunner wrote:
my sirio 4000 hp and 5000 performer in my try mag were checked from new and 1,2 and 1.3 so happy no cutting and happy they perform fantastically  

But put them on my car which has a hole in the roof mount and loads of bonding done and the SWR would be over 3 and they'd be resonant at 26MHz or slightly lower due to the much more efficient RF ground. I ended up having to cut 3 inches off mine to move it up ~ 1.5MHz to cover EU Ch1 to UK Ch40.

That's why you need to check the SWR when you install an antenna and not just assume they'll be OK out of the box because no two installations are the same.

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PostSubject: Re: Antenna tuning   antenna - Antenna tuning Icon_minitime

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