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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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16th Apr 2018, 2:46 pm | #1 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,061
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Ropex Active Antenna
Here is an active HF antenna that came without a power supply. The text printed on it says both shortwave and from 20 kHz to 160 MHz, which seems quite impressive. However, I have only tested it for MW and SW listening, using a homebuilt 12V power supply. Does anyone have experience of using this antenna and maybe a power supply to share a picture of ? It would be nice to know a little more about this antenna. It does seem quite sensitive, but background electrical noise is marring reception at times, even when mounted outdoors.
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16th Apr 2018, 7:32 pm | #2 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Ropex Active Antenna
It is a puzzle - never seen one like it.
Suspect it could be some sort of vertical whip with an active preamp below. It will do what it does. I would probably put it on a non conducting pole, fed by coax with some kind of choke in the feed cable. (Noise isolation from below) If it is good - enjoy. If not then increment last letter X>Y. Please let us know how you get on. Last edited by Jon_G4MDC; 16th Apr 2018 at 7:38 pm. |
16th Apr 2018, 9:59 pm | #3 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,061
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Re: Ropex Active Antenna
I am using RG58 coax cable. Guess I will make a ferrite ring choke to try filter out some of the RFI. With the dry weather round the corner this is a good time to experiment with non waterproofed components, although propagation conditions for MW may have passed their peak with the arrival of spring.
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17th Apr 2018, 7:55 am | #4 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Ropex Active Antenna
The only Ropex I found on Google was a 136Khz tx from 1999.
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17th Apr 2018, 10:28 am | #5 |
Rest in Peace
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
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Re: Ropex Active Antenna
More pictures might help someone identify it. It could be a 'badge-engineered' item more commonly known under a different brand.
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17th Apr 2018, 12:33 pm | #6 |
Heptode
Join Date: Jun 2012
Location: Southeast Norfolk, UK.
Posts: 773
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Re: Ropex Active Antenna
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17th Apr 2018, 2:35 pm | #7 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,061
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Re: Ropex Active Antenna
Some more pictures.....
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17th Apr 2018, 3:36 pm | #8 |
Rest in Peace
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
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Re: Ropex Active Antenna
Results of my Googling:
Ropex are (or were?) Dutch, but there seems to be almost nothing about them on the web. I found a French radio amateur asking for info on the DX-100 antenna some years ago - with no apparent answer. You could try asking Nevada, who sold their 136kHz transmitter in the UK. |
17th Apr 2018, 5:57 pm | #9 |
Octode
Join Date: Mar 2006
Location: Bracknell, Berkshire,UK.
Posts: 1,172
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Re: Ropex Active Antenna
Probably a commercial version of the PA0RDT whip antenna since that originated from Holland. Do a Google. And yes, I am aware of the Ropex 136kHz rig so probably the same firm.
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17th Apr 2018, 7:57 pm | #10 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Ropex Active Antenna
No Roger,I do not know if indeed it was made in Holland.Think it was by a "G" call sign.
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G8JET BVWS Archivist and Member V.M.A.R.S |