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digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list Subject: [Starlink] Re: Starlink and Iran List-Id: "Starlink has bufferbloat. Bad." Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: That leaves the most likely alternative as the action occuring from reasona= ble altitude. Be that in orbit, weather balloon(s)....drones. HAYDEN SIMON UBER GROUP LIMITED MANAGING DIRECTOR E: h@uber.nz M: 021 0707 014 W: www.uber.nz 53 PORT ROAD | PO BOX 5083 | WHANGAREI | NEW ZEALAND -----Original Message----- From: Ulrich Speidel via Starlink =20 Sent: Friday, 16 January 2026 9:27 am To: starlink@lists.bufferbloat.net Subject: [Starlink] Re: Starlink and Iran On 16/01/2026 6:42 am, Colin_Higbie via Starlink wrote: > Can't the traditional approach of just flooding the air with noise reduce= the SNR to the point that most packets are indecipherable? I don't believe= this requires a digital or technically advanced approach nor a focus on GP= S or anything else so specific, just sufficient power and ability to broadc= ast fully across the same spectrum bands to drown out the valid signals. St= arlink, like cellular technology, uses excellent methods to operate amidst = a lot of noise and find its packets, but it's still not immune to noise. > > Iran is a large area, and probably the government lacks the ability to bl= ock the entire nation simultaneously, but I would think they could drown ou= t the signal in specific geographic regions, effectively jamming the signal= entirely or almost entirely in those areas. > > Perhaps some of the cellular or satcom experts here can expand on or corr= ect me if I'm mistaken. My physics knowledge on this has not updated much s= ince the original spread spectrum work decades ago. The original spread spectrum work concerned much much lower frequencies (in= the MHz rather than the GHz) and the physics that goes with lower frequenc= ies (not just spread spectrum) is that at the time, jamming was mostly used= against receivers with fairly omnidirectional antennas.=20 Read: It doesn't really matter where you transmit your interfering signal f= rom - the receiver will hear it. It also helps that the (free space) path loss of RF signals is proportional to the square of the frequen= cy, so low frequency means you can hit a receiver over a substantial distan= ce with relatively little power. Starlink is a different ballgame: It operates in Ku-band above 10 GHz.=20 This means highly directional antennas - so you literally need to transmit = into the receive beam from the beam's preferred direction to be able to jam= at all. Plus having to invest more power to bridge the distance means that= flooding just isn't an option here. -- **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) The University of Auckland u.speidel@auckland.ac.nz http://www.cs.auckland.ac.nz/~ulrich/ **************************************************************** _______________________________________________ Starlink mailing list -- starlink@lists.bufferbloat.net To unsubscribe send= an email to starlink-leave@lists.bufferbloat.net