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 446 Dipole Balun

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morris
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morris

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PostSubject: 446 Dipole Balun   446 Dipole Balun Icon_minitimeMon Aug 24, 2020 3:21 pm

Hello Gents, a question for you technical gurus, i have made a dipole from alloy tube for the 446 band using the dimensions from delboys page,my question is,should a balun be used with the dipole when using a coax feeder?

cheers

John
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Victor
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Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 1950
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Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeMon Aug 24, 2020 4:53 pm

Hi John,

'Technical gurus'?....some just have read more about something than others Wink

It depends on who you ask....and what they've read. 

Technically I'd say yes, but practically I'd say don't bother. (Not much flipping help am I? Very Happy)

It could all get argued to the hills but I happily use one without a balun, many others have too and many Hams run 70cm versions without them either. I do have a dual bander VHF/UHF dipole and that has a simple air choke but that's about it.

If you're trying to squeeze every last 'performance' morsel out, then use one. If you're just 'playing' forget it.

(If you're going for every last performance morsel you'll need a UHF VNA/Antenna Analyser anyway Wink)


There you go.....now you're a 'guru' Smile

All the best,
Victor

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morris
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morris

Call Sign : CT11111
Posts : 120
Times Thanked : 5
Join date : 2019-07-26
QTH or Location : kent

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeTue Aug 25, 2020 7:43 am

Victor wrote:
Hi John,

'Technical gurus'?....some just have read more about something than others Wink

It depends on who you ask....and what they've read. 

Technically I'd say yes, but practically I'd say don't bother. (Not much flipping help am I? Very Happy)

It could all get argued to the hills but I happily use one without a balun, many others have too and many Hams run 70cm versions without them either. I do have a dual bander VHF/UHF dipole and that has a simple air choke but that's about it.

If you're trying to squeeze every last 'performance' morsel out, then use one. If you're just 'playing' forget it.

(If you're going for every last performance morsel you'll need a UHF VNA/Antenna Analyser anyway Wink)


There you go.....now you're a 'guru' Smile

All the best,
Victor

Thanks for your thoughts Victor  Very Happy  i now feel honoured with my new guru status  cheers

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Victor
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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeTue Aug 25, 2020 7:50 am

Ha! Ha! Very Happy You're more than welcome John.

Knowledge is only useful when it's shared and now you too can share some Wink

All the best,
Victor

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stephen Gunrunner
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stephen Gunrunner

Call Sign : 26CT526/MR021/M6XXX26DD666.
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QTH or Location : wooler north northumberland or some were near it
Equipment Used : sirio 4000 on tri mag base is the magnum257hp, mobile magnum257, and crt space-pmr
Age : 64

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeThu Aug 27, 2020 3:31 pm


I never have used and I never will never have any probs with rf feed back and as been said it will do your head in.

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morris
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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeThu Aug 27, 2020 3:37 pm

stephen Gunrunner wrote:

I never have used and I never will never have any probs with rf feed back and as been said it will do your head in.

Lol,fair play no balun it is then  cheers

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeThu Aug 27, 2020 3:41 pm

Nice one Stephen and well said.

Most of us run VHF/UHF at low powers so never see a problem, it's only when we crank up the watts that we need to be more careful.

All the best,
Victor

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Andy591/P
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Andy591/P

Call Sign : M6PXY M0PXY
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Equipment Used : Kwood TS590, 80ft portable tower . multiple h/b antennas. Acom 1kw amp.

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeThu Aug 27, 2020 7:41 pm

Hi John

 If you have got dimensions close and SWR is pretty good, I wouldnt bother. Power is very low on that band. you will only see a tiny amount coming back which wont affect anything.
 Andy 591/P
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morris
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morris

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PostSubject: Re: 446 Dipole Balun   446 Dipole Balun Icon_minitimeFri Aug 28, 2020 2:38 pm

Andy591/P wrote:
Hi John

 If you have got dimensions close and SWR is pretty good, I wouldnt bother. Power is very low on that band. you will only see a tiny amount coming back which wont affect anything.
 Andy 591/P
Thanks Andy, i`ll be using a CRT space U,which i think has a 10watt output,coupled to 20 meters of rg213 coax, i think i`ll be lucky to see 5 watts radiated power if i`m lucky?

Cheers
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