[Premium-Rx] Problem with my long-wire with balun 4:1

[George Georgevits]

Hi Joseph,

Here is my 2 cents worth:

1.	I agree with Fernando - it shows all the signs of cable sheath radiation
2.	If you look at the ITA MTFT manufacturer's web site, says it is a 9:1 balun, NOT 4:1
3.	9:1  is what I would expect for a long wire balun
4.	You are quite right - there is no earth screw on the balun's metal body.
5.	However, if you look at the recommended installation diagram, it is shown the metal balun body clamped to a vertical (metal) pole, which is presumably planted firmly in the ground.

See:

https://en.classicinternational.eu/antennas-assembly/antennas/home-made-antennas/ita-mtft/

My suggestion is -  try earthing the balun's metal case.

Cheers,
George Georgevits 
VK2KGG


-----Original Message-----
From: premium-rx-bounces at mailman.qth.net [mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of joseph.bozzer at skynet.be
Sent: Monday, 20 April 2020 6:29 PM
To: Fernando
Cc: premium-rx at mailman.qth.net
Subject: Re: [Premium-Rx] Problem with my long-wire with balun 4:1

Hi Fernando

I explain you my installation

- My LW arrive to the balun 4:1 (ITA MTFT) on his alone screw .. no earth screw is provide by his manufacture … see his the picture
- the 50 ohms balun output cable arrive directly on my FTDX5000
- my FTDX5000 is connected at a big earth cable on a external earth stake

Joseph




Le 20 avr. 2020 à 10:26, Fernando <rumbek at gmail.com> a écrit :

Hi Joseph, 

My guess is your balun is not working as it should.
The LED lights at home lighting indicate that there is RF coming back through your coax, when you transmit. I believe that, in fact, RF is not getting past your balun and that you are radiating with your coax.  
In my view, there are several possibilities: mechanical problem (LW and balun are not making the necessary contact) or fried balun, which is rare but happens now and then (i.e. if at some point there has been a very heavy thunderstorm with lightning falling nearby).

Just my 2 cents. Good luck my friend, and best wishes to you and yours

73

Fernando EA4BB



> El 20 abr 2020, a las 9:10, joseph.bozzer at skynet.be escribió:
> 
> I don’t understand what’s happened with my 80m long-wire since I installed a balun 4:1 on it
> 
> In 20 meter i’ve a SWR <1,5
> In 40 meter i’ve a SWR 1,5 =< 2 
> In 80 meter i’ve a SWR <5
> 
> With the ATU of my FTDX5000 I put all them to 0 but I have a big problem:
> - On 40 and 80m all is ok .. I’ve very good results in transmission
> - But on 20m it’s a disaster … some LED lamps in my house start to flash at the rate of my CW and the monitoring sound on my FTDX5000 becomes very raucous
> 
> It's impossible to use my Long-wire in 20m
> What's is happen? ... I remind you that without ATU the SWR is <1.5 over 20m
> 
> 
> 
> 
> 
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