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Call Sign : Romeo Echo 137 Posts : 94 Times Thanked : 2 Join date : 2019-10-09 QTH or Location : Halifax Equipment Used : CRT SS 9900 Antron 99 Age : 57
Subject: Sirio short Fri 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 Ps, has anyone ever said "bloody cb's or bloody aerials or bloody wife?"
GaryWilson CT Directors
Call Sign : 26-CT-1836 Amateur Radio Call Sign 2E0GGQ Posts : 4488 Times Thanked : 388 Join date : 2019-06-27 QTH or Location : Redcar, North Yorkshire. Equipment Used : Radios & Wires & Stuff! Age : 60
Subject: Re: Sirio short Sun 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.
Sgt Bilko Major contributor
Call Sign : 108 ct 302 - mm0ibe Posts : 261 Times Thanked : 17 Join date : 2019-07-20 QTH or Location : Prestonpans. East Lothian Equipment Used : SS9900 Age : 56
Subject: Re: Sirio short Sun 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
Master Virus Contributor
Call Sign : Romeo Echo 137 Posts : 94 Times Thanked : 2 Join date : 2019-10-09 QTH or Location : Halifax Equipment Used : CRT SS 9900 Antron 99 Age : 57
Subject: Re: Sirio short Sun 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
Northern Crusader Major contributor
Call Sign : M0GVZ / 26CT1760 Posts : 536 Times Thanked : 35 Join date : 2019-11-13 QTH or Location : IO94SA Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike Age : 54
Subject: Re: Sirio short Sun 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.
Northern Crusader Major contributor
Call Sign : M0GVZ / 26CT1760 Posts : 536 Times Thanked : 35 Join date : 2019-11-13 QTH or Location : IO94SA Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike Age : 54
Subject: Re: Sirio short Sun 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.
Master Virus Contributor
Call Sign : Romeo Echo 137 Posts : 94 Times Thanked : 2 Join date : 2019-10-09 QTH or Location : Halifax Equipment Used : CRT SS 9900 Antron 99 Age : 57
Subject: Re: Sirio short Mon 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.
Today at 7:28 am by glenn dog
Subject: Sirio short 
