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Master Virus
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Call Sign : Romeo Echo 137
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Sirio short Empty
PostSubject: Sirio short   Sirio short Icon_minitimeFri Nov 15, 2019 3:36 pm

Is the sirio 5000 pl meant to have a short in it?
I check the swr and its really high so i go into columbo mode and unplug the antenna from the swr.
I test the plug and the multimetre says its shorting so i strip down the whole lot and test it.
I test the thirty foot length of cable that has a short to find out there isn't a short so i test the 145 magmount and that's got no short either.
I test the sirio antenna inside connector and the outside connector to find its shorting.
So is this antenna meant to have a short with it having a coil? any info would really help columbo i mean me Very Happy
Ps, has anyone ever said "bloody cb's or bloody aerials or bloody wife?" Very Happy
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GaryWilson
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PostSubject: Re: Sirio short   Sirio short Icon_minitimeSun Nov 17, 2019 6:34 am

Hello Master Virus, from memory I think these antennas will show a DC short. Remember there is a difference between the way RF and DC behaves.

73's Gary.
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Sgt Bilko
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PostSubject: Re: Sirio short   Sirio short Icon_minitimeSun Nov 17, 2019 9:55 am

DC grounded.

A DC grounded antenna is any ground plane type antenna that has a DC path from the radiating element to the grounded side. An easy way to identify one is to meter it with an ohmmeter. They will read a short circuit, or very close to it. A more common name is a shunt fed antenna
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Master Virus
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PostSubject: Re: Sirio short   Sirio short Icon_minitimeSun Nov 17, 2019 1:53 pm

It was just when i checked the part that screws into the magmount it bleeps with the continuity test and there was resistance.
But if that's normal like the Antron 99 then everything is cool.
Thank you
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Northern Crusader
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PostSubject: Re: Sirio short   Sirio short Icon_minitimeSun Nov 24, 2019 3:10 pm

Look at the circuit diagram of say a 9:1 Unun and you'll see it is a dead short. Yet to RF it isn't.

Sirio short Cablage_9-1
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Northern Crusader
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Sirio short Empty
PostSubject: Re: Sirio short   Sirio short Icon_minitimeSun Nov 24, 2019 3:11 pm

Look at the circuit diagram of say a 4:1 Balun and you'll see it is a dead short. Yet to RF it isn't.

Sirio short Balun_4-1_image2
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Master Virus
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PostSubject: Re: Sirio short   Sirio short Icon_minitimeMon Nov 25, 2019 6:22 pm

Northern Crusader

Thank you for taking the time to reply i really appreciate it. When you test the inner and outer cables you're not supposed to get a bleep so when you do its a little concerning.
But radio was never simple!
Thanks again.
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