Dec 202015

Back in 2009, I posted about a demilitarized KY-38 NESTOR voice encryption device. Since then, I’ve procured another one. Like the first one, it has been demilitarized (that is, rendered inoperable and unclassified) by removal of key internal components, removal of the original dataplate, and (for some reason I don’t understand) removal of the battery box. But unlike the first one, this one came with a 28″ cable to plug it into the AN/PRC-77 radio, and a matching transit case! There was even an old trouble ticket lost under the padding, though it was for a different unit based on the serial number.

Here are a bunch of pictures of it. Note that as pictured, I think the unit is upside-down in the transit case, and it sits way too low in the case with its battery box missing.


  15 Responses to “Another KY-38 NESTOR Voice Encryption Device (Demilitarized)”

  1. Haven’t seen one of these in a long time. Can’t tell you how many I repaired in my 20 yrs.
    The biggest problem with them wasn’t the 38 itself. It was the keypunch. It was plastic with the pins nestled in small notches in the punch. Peeps wouldn’t slide the cover back on before punching, so the various plates in the punch would open up and the pins would tear out the notches.
    The reason you won’t hear it work, is because of the missing boards. I can’t tell you what they are or how they work but suffice to say this unit won’t work without them.
    The battery box, you can see, is bigger than the 77’s. That is because the 4386’s went in sideways. 2x Ba-4386’s. In the field, this setup was a real pain to carry. Plus spare batteries? Yeah! Wouldn’t fit the Alice pack vary good either as the Alice radio pouch didn’t allow for the 38. And for some reason, beyond my comprehension, it was always the smallest guy in the patrol that got to carry the thing.
    I’m in the process of putting a AN/GRC-87 together, and loving it.
    73’s and Semper Fidelis,
    Russell Ross
    SSGT USMC (Ret)
    1968-88 (91)

  2. Enjoyed your site.

    As an 05C/COMSEC clerk for a Germany-based SP 155mm (nuclear-capable) FA Bn. in the late 1970s, the bulky, Vietnam-era KY-38s–that poor RTO dogface humping the jungle with his
    PRC-77 attached to “that”!–that secured the VRC-12 series of radios in my Bn., were supplanted by the VINSON KY-57. Those crypto hand-me-downs were listed in my Guard unit’s
    TO&E until the early 1980s, when Pres. Reagan’s defense budget increases took root.

    Richard Laird, 65
    SSG USAR (Ret.)
    Brookline, MA

    BTW: Grew up in Atascadero, CA

  3. I am looking to purchase a ky-38. Can anyone advise me where I can get one and a power lead for the prc77?
    Regards AndyStott

  4. I believe I have a Vinson KY-57 test set, compleat with manual and that crypto thing that sits under the RT-524 mount.
    I have also, a pile of cables I would just love to trade off for a military receiver.
    All I have is a picture of the receiver.

    The test set is compleat with a manual and all cables.

    Also, I’m thinking fo selling off my PDP-8/L, in anyone is interested.

  5. Please can anyone tell me the product code for the cable that connects the ky38 to the prc77?
    Does anyone know of one for sale?

  6. Think I have one.
    I’ll have to check.

    • Thank you, that’s great news
      Will wait to hear back from you.

  7. Thank you, that’s great news
    Will wait to hear back from you.

  8. Ok, just how do I post a picture of the cable?

  9. Ok, the cable I have doesn’t work like it’s going to work. But here is the information on this cable.
    The cable is for a KY-57. It has 19-pin/socket on one end and a 14-pin plug that is a match for the X-Mode on the RT-525.
    It will also connect to the power connector on a PRC-25 or 77.
    Here is what it says on the label:

    UNICOR MGR 92837
    CX13061/U (4FT,01IN)

    That’s it…. That’s all I got

    • Hi Doug, many thanks for that.
      I may have to use this cable an possibly just change the 19 pin to a 26 pin connector.
      Not sure if it will still run the audio through it, I would think it would work, as you wouldn’t need all 26 pins for that?
      Do you have an old cable with a 26 pin connector on as well?

  10. Ok. I’ll look at my cable pile and see what I have.

  11. Well, I just went through all my cypher cables.
    I don’t have the cable your looking for.