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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

What about a Burr Brown Serial to Parallel or a Burr Brown Parallel to Serial chips.

Cool video. Btw, are you participating in endmyopia? Or is someone impersonating you? Just curious.

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!!!

Thanks!

Is it like SPDIF.

This channel is giving Rick Moranis taking up electrical engineering as a hobby in his time away from the silver screen.

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.

We have a different version we would love done would u be interested

I bought your switch and ethernet adapters, tons of fun! Any updates on connecting these to a laptop for voip?

Balanced audio doesn't actually need to send the signal inverted. It just needs a difference.

Do you have a shitload of money to burn? How about a R2R by Otari? :D

Sounds good to me.

Excellent. Random find and a great 42min watching.

Liquid crystal display display

Pretty expensive Rick roll

I love your collection gentleman

Heló, I need one open reel same ,hao matsh😮

LED display?

They were just beginning to use them as I was coming into the army in 1981. Prior to that, we were using the TA-312

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!

unable to evaluate any analog digital difference. we all end users on digital smart phones.

It turns out I need to go back to engineer school. Life has been hard to me. Great video, great work on the telephony, really fun!

Rickrolled by a reel to reel.. this is peak Internet 😂

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 :(

I have 2 beige Selectric II and both need repair

Reel to reels are the best

❤❤❤

Yes the world's most Expensive audio format!!! 🎶🤠👍

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.