Balanced vs Unbalanced

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regulaterz
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Balanced vs Unbalanced

Post by regulaterz » Tue Feb 06, 2018 10:15 am

Any good ?https://www.ebay.co.uk/itm/Sirio-GPA-66 ... rmvSB=true vs https://www.ebay.co.uk/itm/FM-Broadcast ... 2884921752

what are your opinions guys??? from what im thinking the top one you just plug and play after tuneing and the second one you would need a Balun as well as tuneing

Tec1 87.5fm London
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Re: Balanced vs Unbalanced

Post by Tec1 87.5fm London » Tue Feb 06, 2018 4:56 pm

I sell J POLES

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Re: Balanced vs Unbalanced

Post by Tec1 87.5fm London » Tue Feb 06, 2018 5:00 pm

J pole antenna - 1500w max power
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Gigahertz
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Re: Balanced vs Unbalanced

Post by Gigahertz » Tue Feb 06, 2018 5:38 pm

I personally prefer the 1/4wave ground plane compared to a dipole. But as Tec has mentioned I've tried a J-pole (broadcast version) made by sandpiper antenna (which they no longer do- unless you shorten the 70mhz one) and that worked very well!

regulaterz
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Re: Balanced vs Unbalanced

Post by regulaterz » Tue Feb 06, 2018 6:20 pm

:P how much for ? looks interesting are they easy to tune and is the swr good

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Re: Balanced vs Unbalanced

Post by Tec1 87.5fm London » Tue Feb 06, 2018 7:46 pm

:tup
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regulaterz
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Re: Balanced vs Unbalanced

Post by regulaterz » Tue Feb 06, 2018 9:16 pm

how much is one you make?or you have a shop i can buy one from

Banus_radio
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Re: Balanced vs Unbalanced

Post by Banus_radio » Tue Feb 06, 2018 11:25 pm

Those J pole photos above are from JSTLINK in california, USA.

http://www.ebay.co.uk/itm/FM-BROADCAST- ... Sww~xZ3QZX

and whats more worrying is 1500 watts through an SO239 Connector? toastie

Im guessing tecs used them just to show you what he can make.

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Re: Balanced vs Unbalanced

Post by Tec1 87.5fm London » Wed Feb 07, 2018 10:02 am

Yes I copied it .I got 1 from USA and started making them u have to have an antenna mfj to do it ...j pole antenna calculator on google it works well.

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Re: Balanced vs Unbalanced

Post by Maximus » Thu Feb 08, 2018 2:32 am

You’re probably better off using an N-connector. An SO239 will probably be ok, but been told they’re built for lower frequencies.

I personally prefer the small BNCs but that’s a different story.


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Albert H
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Re: Balanced vs Unbalanced

Post by Albert H » Fri Feb 09, 2018 6:38 pm

We always considered the SO239 to be an audio connector. They're useless at RF!!
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Re: Balanced vs Unbalanced

Post by Tec1 87.5fm London » Fri Feb 09, 2018 9:16 pm

I put n connecter on my j poles or cable solded on to antenna for hi power

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Re: Balanced vs Unbalanced

Post by yellowbeard » Fri Feb 09, 2018 11:37 pm

On the wikipaedia page for the SO-239 it says "The UHF connector is a World War II or earlier threaded RF connector design, from an era when "UHF" referred to frequencies over 30 MHz." Sums it up perfectly. In fairness I think the SO-239 is a victim of its own success, it is much more popular than the N connector on American ham radio equipment, so there'd be a whopper factory in China making them out of recycled spitoons and smokers snot. :lol:

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Re: Balanced vs Unbalanced

Post by Albert H » Sat Feb 10, 2018 12:55 am

Up to a few hundred Watts I use "N"-Types. I've even had these melt at 900W!
"Why is my rig humming?"
"Because it doesn't know the words!"
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