According to https://www.collinsradio.org/archives/various_articles/PTO_Specification_Data.pdf
it is the correct PTO for the 51J series of radios.
Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy


On Wednesday, October 11, 2023 at 05:47:58 PM CDT, Bill <[email protected]> wrote:


Hello,

  Attached is a photo of a 70E-15 that is in a R-388/51J radio I bought
years ago and never really got around to working with until now. So far
this appears to be a 51J-3,  except for this strange PTO.

  I know this is not the correct "looking" PTO for the radio, but I
would like to know where it came from. In the ideal world I would get a
more correct PTO for the radio and swap them out so someone who needs
one like this could get it. Right now I just want to identify where on
labeled like this came from.

Thanks,

            Bill KA8WTK
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