[GreenKeys] TWX ASR33 and Bell 101 modem - answers to my previous questions

[John, W9DDD]

Any chance someone of the list knows how to contact TX_DJ the producer 
of that video?

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The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 8/22/2021 10:01 PM, Jeff G wrote:
> So I emailed the list a week or so ago that I got a TWX ASR 33, and I 
> asked some questions. While this info is all anecdotal technically, I 
> did a bunch of research and found the answers:
> 
> I asked if a Bell 101c dataset could technically talk to a (slightly 
> more modern) modem and communicate. Answer: Yes, although it may have to 
> be an older modem. I found this cool vid here that actually shows a 
> Model 28 using a Bell 101 dataset to connect to another modem: 
> https://www.youtube.com/watch?v=yco4w3_DaMI
> 
> I'm really hoping I can get mine to do the same! There's a lot of 
> explanation in the vid, so fast forward about half way if you want to 
> see the hands-on stuff, but really for the most part he does a great job 
> explaining everything. I might have to see if he has any resto videos of 
> getting the dataset going.
> 
> Forgive me if this is already common knowledge to most, but for those 
> wondering about what it takes to convert a TWX 33 into a "computer" 33 - 
> the answer is: Not much! After poking and prodding I found mine has the 
> UCC-3 call control, and a manual tape reader (on/off only). While many 
> feel that you need to replace the TWX guts with a UCC-6, you don't 
> really have to, at least using this one as an example. The SMD boards 
> between a UCC-6 and my UCC-3 are only different by a couple resistors 
> really. The UCC-6 SMD board allows for either 0.020 amp or 0.060 amp 
> use, whereas the UCC-3 board is initially set up for the dataset, but 
> really just swapping out 2 resistors, and you're now identical to what's 
> in a UCC-6 SMD board, and the schematics give you the proper values of 
> resistors to use for either current range.
> 
> I found this document which really has all the right info all in one 
> place here, especially the schematics and resistor values for the SMD 
> boards: 
> http://vtda.org/docs/computing/Teletype/WDP0033_WiringDiagramMode33PrivateLineSets.pdf
> 
> Also the UCC-3, at first glance, is missing the tape reader power pack. 
> I found it's just relocated in the base above the Bell dataset due to 
> the dial.
> 
> So I'm hoping that once I sort out the 58 miles of wiring, I can just 
> wire in a switch or two, or maybe a couple relays to switch between the 
> dataset, and a standard 20ma computer loop. There are a LOT of wires 
> between the dataset and TTY, but most of them are for all the buttons 
> and lights on the call control it seems. I'm still doing a little 
> reading and schematic viewing; been something fun on a rainy day while I 
> wait for some parts and things to come in. I'm also a little more 
> confident in finally fixing the gummed up keyboard on my 32, and maybe 
> trying to get the HAL ST-6 to actually talk RTTY on the actual radio 
> (ITTY works great!).
> 
> (I won't mention the 43 or the 19 yet *smirk*)
> 
> Jeff KC3GJX
> 
> 
> 
> 
> 
> 
> 
> 
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