I have two military phones. Fully functional with a battery and hand cranck. Used it so my mum could call when diner was ready. No need for encryption.
There was a SB-3865 man transportable switch, 32-ish digital lines. They were used up to the 2000 giver or take. TRI-TAC architecture to include the mobile TTC-39 switch on wheels. man.fas.org/dod-101/sys/ac/equip/sb-3865.htm
Haha yeah I do! Not sure I’m cool enough to have impersonators yet. I was gonna do a video on it but probably on a separate Nick’s Rants channel. Down from -4.5 to -1.5 (which is also why my glasses switch frequently if I have to read the prompter 😂).
@@nicksknackstechfor real? 😂 i joined like 1.5month ago the FB group. I've seen your videos before and remembered your name when I saw it on there. Legit thought maybe it's bs pseudoscience group that uses bots or smth. Do you have discord and would have time to chat? I'm really curious now whether this truly works and would just like to hear your experience with it 😅 I literally used to have a meme prescription of -0.5 that turned to -1.5 and gave me massive headaches. Then every time I went to opto, they just kept loading me with exact same headaches. I wonder maybe I'm just accustomed to it now? Because what I noticed when I started to question these prescriptions, after walking without any correction I am able to see digital clocks from 5-7 meters distances. Able to see house numbers 10+ meters away after blinking. And I'm currently like -7.5. at that diopter range, there is no way I could be experiencing something like that. Was told by opto: you are just imagining things. 😂
You boys should remember if you are using those phones for secure transitions that people can tap the phone line. I won't go into how but I bet you already know. The Tempest document says that the phone lines used to transmit the stuff you want to transmit should not only be encrypted, but it has to use shielded lines. The encryption could be broken by nogoodnics. Good thing is that some of this infrastructure already exists. It would probably be on older military bases and government buildings. You could probably use their phone lines to get a secure message out. It's just a matter of getting them to give you clearance. You could try to get them to give you a civilian instructor job and get to use the phone system that way. If you manage to do this and you can get in contact with me I can give you some idea of how to fix a problem NATO is having right now. Just remember, don't tell people too much on the unsecured line.
I really appreciate you making these videos. This is the first time I have been on your channel. I usually watch Hash on Reverse Engineering News. I'm going to have to watch this vid a second and maybe a third time before it all sinks in but I think this is a project I want to undertake. I'm going to see if I cannot buy a couple of those phones on eBay. Cheers!!!
Great video! from 2000 to 2004 I was in 44th Signal Battalion and I specifically was in a Small Extension Node (SEN) that had TA-954 DNVTs. The switch board that these connected to was SB-3614. The TM for the TA-954 is TM 11-5805-735-12. I've emailed some old timers that still remember operating/working on these systems to see if I can track down a digital copy of the TM. I have a couple DNVTs and I'd love for them to be useful.
Love your video! From 2000 to 2004 I was in 440th Signal Battalion. The switch board that DNVT's connected to was called a SB-3614. The technical manual for the TA-954's is TM 11-5805-735-12. I have sent emails to some old timers to see if they can dig up a digital copy. I have a couple DNVT's and I'd love for them to be actually useful. First connect the DNVT to the switchboard with WF-16, Second you would then pickup the handmic (H-250) and dial phone number then push R to register that phone number for that phone to the sb-3614.
Hey sorry for the delay - the plan is to create one pjsip process per line and then register it to an asterisk server or similar. This will transmit the raw CVSD data over SIP to allow data modes, then leverage a CVSD codec in asterisk to allow transcode to other formats like ulaw. Such a project is a new endeavor to me as it requires piping command/control/state plus streaming audio data between two Linux processes which I have yet to perfect. I’ve chatted with some telecom folks and they agree this is probably the best option but it requires essentially demuxing the audio data and distributing it amongst different pjsip processes. I had some help dealing with the pjsip side but any collaboration or emotional support would probably help speed things along. Feel free to email or join discord for more or to help out :)
Wow - amazing content! I love these old phones. Excellent analysis and explanation. I’m not an electronics expert, but I love reverse engineering protocols and this was some excellent sleuthing. Well done!
I doubt there's a substantive difference since the tape effect is already present on the original master (which is tape) and if the digital preserves that accurately, there shouldn't be a huge difference. Other than the fact that this is a second generation tape.
@@nicksknackstech good call. Honestly i learned more in my life taking things apart and reverse engineering, but the initial book knowledge is important to remember all the values and maths..
yeah I agree -- I actually found it most helpful when I first did some spelunking of my own, then went back and took a course. For example I had done database work on my own before I took a databases course, and it helped me put everything in context. There are a ton of resources around for learning, and part of my intent with this channel is to provide the same sort of educational content for people looking to do similar projects :)
This is so cool! It reminds me of the Tft 96 AWITEL from SIEMENS that is in use in the Swiss army. It is similar in that it is also a non-secure voice terminal, but it doesn't need a switch to work (unless you want to connect to a normal telephone network). What's even cooler is that it connects inductively to the twisted pair, so you don't need to cut any cables. Unfortunately these aren't on eBay like DNVTs, even though they are from the 90s :(
@@nicksknackstech Yes, the army is. But they were also sold on the civilian market, so I was counting on that. They didn't make a whole lot though. There is a wikipedia page in german if someone wants to read on that.
I was quoted $750 for an overhaul in Seattle area. Mine has some sticky levers (and the typical disintegrating foam) and it can be resolved with a solvent clean and relubrication, though with the number of projects I have up in the air I'm unlikely to get around to this one. If you have a cracked gear on the drive side it's more involved.
Parts shortages: I assemble my own boards - I probably shouldn't because it takes a long time. It takes me about a year to put a board design like this together once I have a schematic. All of the "jellybean" parts like resistors and caps are always the same size on all my boards - 0805. This way, I can order bulk when available and they'll work on all my boards. I can see and solder and rework 0805, smaller parts start to get to be a pain in the arse. With "special" parts, like transformers and level shifting ICs, I closely look at the manufacturer websites to see if the part is marked for discontinuation (not for new designs). I also try to use parts which I know are used over and over in some other product which sells well. This encourages the manufacturer to continue making the part. Transformers for me are always ETAL branded as they have a pretty common pin spacing. If there is a problem with a part being available, or is soon to be discontinued, I will quite happily take an axe to my schematic BEFORE I start to lay out the board. Front panels: I've started adding a copper-pour to the rear of the panel, and then making the screw-holes with plated through-holes with a large circular pad on the front so that the screws can "connect" to the panel. I also expose the rear perimeter of the panel and sand off any powdercoat from the main enclosure ends so that the panel can "connect" to the enclosure. This makes for a fairly robust continuous chassis enclosure, fully wrapped in equipotential metal. It tends to help with audio gear attached to ultra aggressive digital RF gear and interference.
