devicelab
Whacker Extraordinaire
So tell me... how does this antenna transmit on various HF frequencies (as low as 2700khz and as high as 22mhz) whilst delivering over 1KW of output power...? Where is the magic sauce in this antenna..?
what is the maker and model number of this antenna?
I suspect that top whip is too short to do much good. Looks like a shortened CB antenna. Put something longer up there and it would likely work fine.
I wonder if this could be a publicity photo and not the real thing... hmm...
That coax looks mighty thin to handle a kilowatt.
It's the network transmitters that transmit 1Kw. The end-user setups are what are in the picture (I think) and use 125w radios.
So it's part of a nationwide HF cellular network that's been around for about five years.. https://www.rockwellcollins.com/~/m...ldwide/Brazil/HF-Cellular-Network-CB-001.aspx
I did some searching to see if I could come up with any of the many HF frequencies they say they use. After about 10 mins I came up negative. Anyone know?? If not digital, or scrambled in some way it might be interesting to monitor.
The picture show all four horizontal elements to be connected to the same metal disc. The top whip are offset to the ground disc to be able to have its antenna connector going thru the metal disc and connect to the coax outside of the mast tube. It seems to be one vertical element that does it all. The ground disc seems to have more holes in it to accommodate twice as many ground plane elements.I believe the horizontal whips are configured as cross dipoles with two connected to hot and two connected to ground....
The picture show all four horizontal elements to be connected to the same metal disc. The top whip are offset to the ground disc to be able to have its antenna connector going thru the metal disc and connect to the coax outside of the mast tube. It seems to be one vertical element that does it all. The ground disc seems to have more holes in it to accommodate twice as many ground plane elements.
/Ubbe
I did some searching to see if I could come up with any of the many HF frequencies they say they use. After about 10 mins I came up negative. Anyone know? If not digital, or scrambled in some way it might be interesting to monitor.
I've only confirmed these two personally... there are others I'm sure...
4234.0
6335.6
There's a link there to this site --> http://www.ominous-valve.com/ale-list.txt which has a bunch of frequencies listed. But doesn't appear to be anything specifically related to the Collins Rockwell HF cell network freqs.