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

[joseph.bozzer at skynet.be]

Hi Fernando and Peter

I tested this :
- the 50 ohms cable is not in short-circuit
- the metal box of the ITA-MTFT is completly isolated... i can’t be used it earth counter-balanced
- the earth cable of FTX5000 is good
- the contact of this cable and earth stake is good

I think as you that’s a problem of cable sheath radiation 
In looking this website, I would want to try to create a earth counter-balanced in putting to the earth the mass of PL259 at the output of the balun .. what do you think of that?

https://www.nonstopsystems.com/radio/frank_radio_antenna_multiband_end-fed.htm




Le 20 avr. 2020 à 12:16, Fernando <rumbek at gmail.com> a écrit :

Dear George, I think these are very good points indeed.
Otherwise I believe that the balun is already grounded through the coax’ shield, which is electrically connected (should be) to Joseph’s GND in the shack (I assume that the FTDX5000 chassis is connected to ground). In fact, something else to look into is the grounding scheme (1 - the integrity of the PL259 - SO239 connection at the balun, and 2 - the the grounding system at home is not interrupted). 

73 de Fernando EA4BB 

> El 20 abr 2020, a las 11:02, George Georgevits <georgg at bigpond.net.au> escribió:
> 
> 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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> 
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