[GreenKeys] Fake TTY/crypto equipment

[John Hargett]

Always lurking, but will comment here also.

     After manufacturing a battery case bottom from .0625 alum to match 
the  battery terminal adapter MX-4430 to allow me to install a 12vdc to 
28vdc converter ( Victron Orion 12/24-20)  inside of it and use just a 
single 12 v battery to feed the adapter box to run my PRC-47, this has 
me thinking and drawing in autocad to see how feasible it might be to 
fab the covers for this project.  I will do some digging around for some 
good dimensions, but if anyone has access to a KW-7 to get me some 
dimensions  and good pics, I am willing to see what I can do.   Dont 
think it would be too bad or take too long, already have some custom 
dies for the press brake to do the 1" radius bends on the battery box 
and it looks like it should work for the KW-7. Also have powder coat 
capabilities , so just need to have a RAL # for the powder match.

( just picked up a KSR28 that was stored in a barn, so definitely some 
clean up involved , at least it cam with the manuals, and they were not 
eaten by anything)

     Dont have enough projects, always looking for more.....


73

John

kg5ylg

On 6/30/2021 5:56 PM, Christian Gauger-Cosgrove wrote:
> Exiting lurker mode just for this conversation...
>
> On Wed, 30 Jun 2021 at 15:25, Nick England <navy.radio at gmail.com> wrote:
>> I'd like to create a fake KW-7 crypto unit - these units encrypted/decrypted teletype signals. I need a fake one because they don't ever show up on eBay.
> You have ALL of my attention with this idea.
>
>
>> I'm only concerned about the external appearance, not the internals.
> You know, with how cheap electronics components are, you could make it
> semi-functional; either by shoving in an Rπ and using modern stream
> ciphers (ChaCha20); a CPLD with one of the eSTREAM portfolio simple
> ciphers (ChaCha20, again), a hardware version of an eSTREAM cipher
> (TRIVIUM or GRAIN), or toss a bunch of 7400 logic into building your
> own LFSR cipher of a 60s persuasion.
>
> Or you could just have it setup to only emit text on the plaintext
> side (e.g. an RSS feed, or Tweets sent to it, or something like that).
>
>
>> Have you seen the props in a furniture store that look like a TV or stereo but are just painted vacuuformed plastic? That's what might work and then I'd add some real switches and indicator lamps. I'd have to make a wooden/foam mock-up to use as a mold.
> Those are pretty flimsy, at least the last encounter I had with one.
> Though, a stronger/more robust vacuformed plastic could work.
>
>
>> Is this too crazy? Most importantly is there a better way to do this?
>> Just 3D print a plugboard/card-reader cover and mount it on sheet metal?
> Go whole hog and make an actual punch & die setup? You'd likely not be
> making a huge quantity run, and using some very thin aluminium sheet
> would be "easily" formed. So you could probably get away with making
> the punch and die out of wood. The YouTuber behind the channel "Stuff
> Made Here" made a punch and die out of wood, for forming steel toe
> caps for crocs (I wish I were joking), so it likely wouldn't be
> excessively difficult to carve out a blank for the KW-7 front panel.
>
> Of course, this also is predicated on "do you have a press large
> enough" and "do you want to deal with the hassle".
>
>
>> If it is possible, I'd like to make more to donate to museum ships, etc. that just have empty rack spaces where crypto equipment used to be.
> My (possibly stupid) suggestion of a punch & die set and think
> aluminium sheet metal would likely be best for this if you're going to
> try and make more than two or three.
>
>
>> All suggestions and ideas are welcome including "just lie down until the feeling goes away".....
> Suggestion: Make it vaguely functional. For shits and giggles.
>
>
> Regards,
> Christian

-- 
This email has been checked for viruses by AVG.
https://www.avg.com