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Identify Antenna?
- Thread starter rrpilot
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prcguy
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Its a stressed wire HF log periodic. Instead of booms and rigid elements it uses rope around the perimeter to suspend the elements.
mmckenna
I ♥ Ø
…on top of an old AT&T Long Lines microwave tower.
Nice find.
Nice find.
It looks to be a New Line Networks / Jump Trading HF link for high speed stock, commodity trading. They applied to the city for a permit/variance to put that antenna up in early 2020, https://www.waynetownship.com/planning-zoning-documents.html?task=document.viewdoc&id=6214
rrpilot
Newbie
TY!
BOA-2019-031 has links to other related documents. Apparently, they're trying to see if they can beat the transatlantic cable propagation delay. I'm skeptical that they can get enough reliable bandwidth. I didn't find a relevant license within 300 m of the site (40 56 27.3, -74 11 58.8) on 1-30 MHz in ULS. The FCC's multi-system search is down (as usual), but maybe it will reveal something later.
nd5y
Member
There was a big thread about the HFT guys on another forum a while back.
They probably have an experimental license. Those aren't in the ULS. Try searching here.
Right. That FCC system always seems to be down in the early morning hours (when I posted).
The relevant grant appears to be WK2XTH (originally file 0075-EX-CN-2020, now 0028-EX-TU-2020) to 10Band LLC with a transfer to William diSomma Trust. Apps are signed by Matthew Hinerfeld. Related files/calls:
The WK2XTH grant shows wide bands from 5 to 21 MHz with 2 kW power out / 28 kW ERP and 24-48 kHz bandwidth FSK/4-QAM. Seems awfully narrow for the intended purpose (I was a trader in the ramp up to the current HFT world). Anyone know how much bandwidth you can expect from 48 kHz 4QAM with the current state of tech? Seems like reliability would be an issue as well. Resending packets (and incurring an extra set of delays) defeats the purpose.
The antenna is a Rohde&Schwarz HL451.
The Illinois sites have up to 20 kW out / 808 kW ERP and modulation up to 128QAM, and are about 15 mi NW of the CME data center. The last site is in Everett (north of Seattle), Washington.
(some links may not be permanent)
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