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#cband

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Replied in thread

@jt_rebelo @mastodonmigration @GottaLaff I'd call #Ukraine "criminally incompetent" if they didn't already leverage domestic #Fiber & #GSM networks as well as procuring entire transponders for exclusive use.

Infosec.SpaceKevin Karhan :verified: (@kkarhan@infosec.space)@dragonfrog@mastodon.sdf.org @benh@mastodon.scot @mastodonmigration@mastodon.online @GottaLaff@mstdn.social as for #ITsec amd the whole #Starlink #Network: It basically uses a homegrown mix of #DOCSIS, #GSM and #ViaSat #SurfBeam technologies to generate these hexagon coverage areas. - Certainly not trivial, but not impossible to #BlueBox, tho unless one needs #FPS-grade #Ping|s, it's not worth the effort when other Options like #KaSAT are easier and cheaper to get hold of... https://infosec.space/@kkarhan/114048966406486263
#xtar#bwsatcom#nato
Replied in thread

@mastodonmigration @GottaLaff noone relies solely on #Starlink, espechally given it's big-ass dishes.

  • Even the #US #DoD uses #Iridium & #UHFSATCOM.

  • #SES & #Eutelsat have various commercial #Cband, #KuBand & #KaBand transponders for bidirectional data from their GSOs.

  • #XTAR has a #Xband-Spotbeam.

  • #Ukraine has both #Fiber and #Radio links (civilian and military) to link together units and emplacements. Espechally direct-burial/lie-flat fiber is used because #COTS parts are cheap, commonplace and unlike copper, they can do 160km+ without amplifiers with ample of room for splices.

Pretty shure Starlink was a mere "comfort feature" allowing units to send their drone footage from their FOB to HQ for instant #Meme|fication and "scoreboard updates" but I'm shure worst-case the #NAFO friends will just pack in some 2,5" SSDs and USB cases with the next supply trucks or have some #Skyhook-Style delivery system if that was ever needed.

  • I'm shure the folks in the trenches will miss YouTubing in their toilet break, but I'm shure they still have enough #Memes and #Entertainment in reserve to compensate for it.
Replied in thread

@vwestlife #Funfact: In #Europe, #Cband dishes weren't common so #SatelliteInternet used simiar #Tuner cards with #VSAT terminals, usually accepting downlinks from regular commercial #TV #satellites that were just data channels on #ASTRA and/or #Eutelsat #HotBird in the #KuBand...

  • Later they got some fancy "SAT-Routers" that combines a #DVB-S downlink and an #analog #56k / #ISDN modem for uplink if not offered to use #2G #mobile networks as well...

I've got one of those:

Basically a #Router with some #Linux on Ethernet, Power & F-Screw-Connector on the rear, #56k& #ISDN #Modem|s and USB up-front.

  • And yes, I used that to share a #dialup connection with multiple devices, because they can do that!

This C-band LNB is a bit crusty. But might even work!
Should be usable for seeing 3.4GHz stuff on the spectrum analyzer, even if the DRO in this thing is not super stable.

Has anyone converted these to 5.7GHz?
The LO is 5150MHz
Shouldn't that just be ripping out or replacing some filters?

I wonder if it would upconvert with sane effort.
Gain is much cheaper and less fiddly on 3.4GHz and 5.7GHz than 10.3GHz.

#cband#3400MHz#9cm
Replied to thebaldgeek

@thebaldgeek I am betting you got a PLL #cband #LNB and it is sensitive to the cold. This has been a problem with these LNB's for a long time, as you can see from this article from 2016:

Are phase-locked loop (PLL) LNB’s a good idea?
freetoairamerica.wordpress.com

(Note the last EDIT down near the bottom of the article).

I don't know how cold it gets where you are but I suspect you are going to have issues during any cold weather event. In theory you could attach some kind of heating element, like a small reptile tank heater (make sure it's waterproof) and turn it on a few minutes before you want to watch TV but IMHO those things are just poorly designed, even if they are being marketed as a solution for 5G interference.

Free-To-Air AmericaAre phase-locked loop (PLL) LNB’s a good idea?By freetoairamerica

Pulling my hair out of late (wait, Im bald!).
I swapped the #LNB on the #cband dish because I was getting, what I suspect is #5G interference for an #LNB that has a filter.
Turns out the new LNB is a bit of delicate snowflake and is unhappy outside of a very small temperature range.
I have already done the #GPSDO modification, so its not that.
Long story short, I thought it was a tracking issue for a good while, but now working on getting a stable temperature range for it.