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| Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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30th Mar 2017, 9:50 pm
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#1 |
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Diode
Join Date: Dec 2016
Location: Derbyshire, UK.
Posts: 9
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RF antenna ?
Can anyone identify , give me nore information on this
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30th Mar 2017, 10:41 pm
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#2 |
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Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: RF antenna ?
It's a current transformer for an LF aerial. 75A primary current (the conductor passing through the coil) to 1A through the secondary winding and resistor, developing what looks like will be 80V across it.
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Regds, Russell W. B. G4YLI. |
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30th Mar 2017, 10:44 pm
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#3 |
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Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: RF antenna ?
I'll bet that resistor has been chosen to give as near as dammit 1Volt / Ampere. Those CTs are very much in use today.
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Regds, Russell W. B. G4YLI. |
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31st Mar 2017, 3:04 pm
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#4 |
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Diode
Join Date: Dec 2016
Location: Derbyshire, UK.
Posts: 9
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Re: RF antenna ?
Thank you for the information, I picked it up from a garage clearance - are they still available to buy ?
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31st Mar 2017, 4:31 pm
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#5 |
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Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: RF antenna ?
I doubt that particular type is still available, having been superseded by the likes of Pearson C/Ts (a U. S. company) amongst others.
http://pearsonelectronics.com/ I wonder where yours came from originally?
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Regds, Russell W. B. G4YLI. |
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31st Mar 2017, 5:22 pm
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#6 |
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Diode
Join Date: Dec 2016
Location: Derbyshire, UK.
Posts: 9
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Re: RF antenna ?
It was wired in when I got it, I have it complete with ceramic insulator and Inductor coil. What is its value ?
Last edited by paulsherwin; 31st Mar 2017 at 5:28 pm. Reason: to comply with forum rules |
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31st Mar 2017, 5:27 pm
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#7 |
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Diode
Join Date: Dec 2016
Location: Derbyshire, UK.
Posts: 9
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Re: RF antenna ?
Another photo when it was installed
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31st Mar 2017, 6:02 pm
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#8 | |
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Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: RF antenna ?
Quote:
 Oh... You mean its monetary value? Don't know. It looks like it has been purloined from its original use and had become part of an amateur radio station.It's still a practical working device (insofar an Avometer is in the world of Flukes) but is only really of use to those who transmit on LF or, perhaps, the lower HF bands. I can't say what particular frequency that type will work up to accurately as I haven't experimented with a similar one.
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Regds, Russell W. B. G4YLI. |
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