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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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Old 16th Apr 2018, 1:46 pm   #1
Jolly 7
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Default 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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Old 16th Apr 2018, 6:32 pm   #2
Jon_G4MDC
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Default 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.

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Old 16th Apr 2018, 8:59 pm   #3
Jolly 7
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Default 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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Old 17th Apr 2018, 6:55 am   #4
HamishBoxer
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Default Re: Ropex Active Antenna

The only Ropex I found on Google was a 136Khz tx from 1999.
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Old 17th Apr 2018, 9:28 am   #5
G8HQP Dave
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Default 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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Old 17th Apr 2018, 11:33 am   #6
G3VKM_Roger
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Default Re: Ropex Active Antenna

Quote:
Originally Posted by HamishBoxer View Post
The only Ropex I found on Google was a 136Khz tx from 1999.
Beat me to it! I think I saw one or two of these antennas in use on small craft back in my seagoing days. Wasn't the TX made in Holland?

Cheers

Roger
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Old 17th Apr 2018, 1:35 pm   #7
Jolly 7
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Default Re: Ropex Active Antenna

Some more pictures.....
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Old 17th Apr 2018, 2:36 pm   #8
G8HQP Dave
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Default 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.
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Old 17th Apr 2018, 4:57 pm   #9
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Default 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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Old 17th Apr 2018, 6:57 pm   #10
HamishBoxer
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Default 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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