HF ''Cobweb / Fan'' Type antenna

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mr_h4ck3rm4n
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HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

I have spotted this antenna at my work offshore,, it is connected to a HF antenna tuner, does anyone know what type of antenna this is... and are they any good for HF , it looks easy to copy and make a homebrew version.... the top part sits on top of an insulator .


cheers
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MikeRiley
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Re: HF ''Cobweb / Fan'' Type antenna

Post by MikeRiley »

I don't know what it is but I'd be interested to know.

I'm looking at various omni-directional HF antenna solutions myself and would be interested to see what this turns out to be and how hard it is to duplicate.
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Black_Pirate
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Re: HF ''Cobweb / Fan'' Type antenna

Post by Black_Pirate »

looks more like a sat comms RX to me I think I,v seen them on ships...
looking for propagation for 2013 and beyond... Operating close to the Edge....
of reason......and the Quantocks...
Didi modes (JS8 on 27.245 usb) txt messages via radio lol at minus- 10 to 20 db..... 😊 See FB page...

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kr0ne
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Re: HF ''Cobweb / Fan'' Type antenna

Post by kr0ne »

How big is it?
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mr_h4ck3rm4n
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Re: HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

Deffo a HF antenna, its connected to an MF/HF ATU, everything from the 'hub' up is 'live' element., it is approx 5m diameter, each of the 'lobes' are 2-2.5m.

The sat antennas here are all dome enclosures with directional tracking, the other antennas are hf whips, vhf marine whips, uhf dipoles for telemetry/local repeater, airband collinear and a large hf wire, we are on a large FPSO (oil platform) and dont move or 'sail' and we are around 200miles from shore so our radio comms is usually only vhf marine for local ships, airband for heli, uhf local repeaters, and telemetry links to other platforms ect.., the sat links allow telephone and internet, the HF kit onboard is not really used.. its set to monitor GMDSS freqs.

Strange HF antenna to me... seen many different whips and longwire antenna setups offshore but never anything like this. I cant see any manufacturer labels but it looks very simple to 'replicate' , i have a nice MF/HF marine set and external ATU and thought it may be a project.....

HF
Yaesu FTdx1200, Kenwood TS590,
Sailor T2130 & T2031MF/HF Systems
Ameritron 811, Yeasu FL2100
VHF/UHF
Icom IC-208H, Icom IC-2820
Jotron TR7550 VHF Air
Antenna
Comet GP9, Hustler 5-BTV, 3 ELE Yagi 10m/11m
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kr0ne
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Re: HF ''Cobweb / Fan'' Type antenna

Post by kr0ne »

It almost looks like a scaled down trideco...

...almost.

I really want to know WTF this is now! :?
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Re: HF ''Cobweb / Fan'' Type antenna

Post by Black_Pirate »

hmmmm if it broke who would repair it....????
.may that way you could trace the manufacturer....
its a weird one
looking for propagation for 2013 and beyond... Operating close to the Edge....
of reason......and the Quantocks...
Didi modes (JS8 on 27.245 usb) txt messages via radio lol at minus- 10 to 20 db..... 😊 See FB page...

26T.M.034
GOOD LUCK IN DX
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mr_h4ck3rm4n
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Re: HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

Black_Pirate wrote:hmmmm if it broke who would repair it....????
.may that way you could trace the manufacturer....
its a weird one


...lol :twisted: , we are in angola... everythings broke!

HF
Yaesu FTdx1200, Kenwood TS590,
Sailor T2130 & T2031MF/HF Systems
Ameritron 811, Yeasu FL2100
VHF/UHF
Icom IC-208H, Icom IC-2820
Jotron TR7550 VHF Air
Antenna
Comet GP9, Hustler 5-BTV, 3 ELE Yagi 10m/11m
Data Interface
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Re: HF ''Cobweb / Fan'' Type antenna

Post by Samalex »

maybe its some sort of capacity hat for a vertical antenna

you got a picture of the full view of the vertical section?
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Re: HF ''Cobweb / Fan'' Type antenna

Post by northern35s »

I'd venture it costs a fortune and is sold and marketed as a 'professional' comms antenna, so it must be good of course, the design being used to wrench mucho dinero from organisations that need a reliable, space saving, 'professional' antenna, anything that requires an ATU in order to function is compromised.

If it was any good we'd all be making them instead of the myriad of other antennas we use, all in my humble opinion of course ;)
Mobile DXing from the car and on foot
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mr_h4ck3rm4n
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Re: HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

Thats a fact.. I have seen the 'vendor' for our moto trunk network having to fly to africa to 'have a look'.. The platform is 330m long and we have a trunking net... Crazy!... Oil companys mega bucks..

HF
Yaesu FTdx1200, Kenwood TS590,
Sailor T2130 & T2031MF/HF Systems
Ameritron 811, Yeasu FL2100
VHF/UHF
Icom IC-208H, Icom IC-2820
Jotron TR7550 VHF Air
Antenna
Comet GP9, Hustler 5-BTV, 3 ELE Yagi 10m/11m
Data Interface
Kantronics Pactor TNC , MJF 1275X



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mr_h4ck3rm4n
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Re: HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

Samalex wrote:maybe its some sort of capacity hat for a vertical antenna

you got a picture of the full view of the vertical section?

The vertical section is 6" steel pipe welded to the deck... On top is a ceramic insulator and then the antenna

HF
Yaesu FTdx1200, Kenwood TS590,
Sailor T2130 & T2031MF/HF Systems
Ameritron 811, Yeasu FL2100
VHF/UHF
Icom IC-208H, Icom IC-2820
Jotron TR7550 VHF Air
Antenna
Comet GP9, Hustler 5-BTV, 3 ELE Yagi 10m/11m
Data Interface
Kantronics Pactor TNC , MJF 1275X



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kr0ne
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Re: HF ''Cobweb / Fan'' Type antenna

Post by kr0ne »

Where is the feed point?
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mr_h4ck3rm4n
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Re: HF ''Cobweb / Fan'' Type antenna

Post by mr_h4ck3rm4n »

On the left of the pole there is a wire going to an isulator before connecting to the top section.
It comes from an atu mounted at the base.

HF
Yaesu FTdx1200, Kenwood TS590,
Sailor T2130 & T2031MF/HF Systems
Ameritron 811, Yeasu FL2100
VHF/UHF
Icom IC-208H, Icom IC-2820
Jotron TR7550 VHF Air
Antenna
Comet GP9, Hustler 5-BTV, 3 ELE Yagi 10m/11m
Data Interface
Kantronics Pactor TNC , MJF 1275X



QRZ.COM
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kr0ne
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Re: HF ''Cobweb / Fan'' Type antenna

Post by kr0ne »

Hmmmmmm..... oh yes, I see now.

Is that just a plain old bit of wire? Do you think it is the main radiating element?
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