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 What is this antenna system? 
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Post What is this antenna system?
https://www.facebook.com/DA0FF/videos/1361728993971959/
Looks like some omni-directional array?

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Am YIsrael Chai


Sun Jul 15, 2018 6:16 pm
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 What is this antenna system? 
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Post Re: What is this antenna system?
My guess would be four vertically stacked arrays, each pointing in a favored direction with an antenna switch used to change the direction rather than a rotator.

If that is the case, it could well be they could also all be made active making the system omni too.


Either way, an impressive set up!

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John - G7SSE

"Two things are infinite: the universe and human stupidity, although I'm not sure about the universe."


Sun Jul 15, 2018 9:29 pm
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 What is this antenna system? 
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Post Re: What is this antenna system?
I wonder if some complex phasing system could drive all of them simultaneously?
Looks very neat.

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Am YIsrael Chai


Sun Jul 15, 2018 9:31 pm
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 What is this antenna system? 
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Post Re: What is this antenna system?
Horizontally polarised, multi stacked antennas, switchable in quadrants.
Often used in conjunction with a seperate, much higher gain rotatable array.
For contest working the majority of stations could, probably, be worked on one of the fixed stacks, switching is faster than rotating, the weaker ones using the higher gain rotatable system.

A couple of the UKAC operators use multiple antennas.
It's these sort of contest driven systems that generate innovative ideas.

At least one of the German clubs uses a much more complex system which mixes fixed, and rotatable antennas.
Attachment:
DR9A.jpg
DR9A.jpg [ 132.09 KiB | Viewed 460 times ]

https://www.youtube.com/watch?v=2Rh3-K8V4_o

It also helps if you have multiple operators who speak multiple languages. :D

Cheers

Tony

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Mon Jul 16, 2018 12:16 am
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 What is this antenna system? 
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Post Re: What is this antenna system?
The bigger ones have "manners filters" too, helps em step on other stations. Not to mention preamps to ensure absolutely everyone is a 59

D

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David. G4YVM


Mon Jul 16, 2018 6:44 am
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 What is this antenna system? 
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G4YVM wrote:
The bigger ones have "manners filters" too, helps em step on other stations. Not to mention preamps to ensure absolutely everyone is a 59

D

Never witnessed such behavior on VHF Dave, as for the pre-amps I can't comment as I have never used one.

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Am YIsrael Chai


Mon Jul 16, 2018 6:52 am
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 What is this antenna system? 
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Post Re: What is this antenna system?
Quote:
The bigger ones have "manners filters" too, helps em step on other stations.


Says the bloke who stuck a VHF antenna up,and then declared the bands dead in Salisbury :rotfl:


Mon Jul 16, 2018 7:26 am
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 What is this antenna system? 
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Post Re: What is this antenna system?
g4rra wrote:
Quote:
The bigger ones have "manners filters" too, helps em step on other stations.


Says the bloke who stuck a VHF antenna up,and then declared the band dead in Salisbury :rotfl:

Even when the band is dead the band is never dead.

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Am YIsrael Chai


Mon Jul 16, 2018 7:31 am
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 What is this antenna system? 
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Post Re: What is this antenna system?
What you work on VHF/UHF is proportional to the amount of effort you put in to do it,that coupled with making sure you are in the right place at the right time.

Something you and I both know :D


Mon Jul 16, 2018 7:36 am
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