I don't think it was restricted to any BC-221 version, Jim.  There is an antenna connector on the top of every TS-164 case¹ that I have ever seen which emulates the ones used for quite a few BC-221 variants, and the installation instructions simply record " BC-221-* " without disqualifying any exceptions.  Designed primarily as a field retrofit, perhaps the need for complete units simply drew upon a couple of active contracts?  Just speculation.

¹https://aafradio.org/docs/TS-164.html

- Mike  KC4TOS

No antenna & ground posts on front panel?  

It appears, from a quick look, that only the AJ and AL models had those front panel inputs so perhaps the TS-164 only used these two models?  See: BC-221 - RadioNerds

Regards,

Jim

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

On Sunday, December 10, 2023 at 07:41:09 PM CST, Hubert Miller <[email protected]> wrote:

‘Hangarthirteen.org’ is quite a resource, isn’t it ?

BTW, a question: the TS-164, repackaged BC-221, except for BC-221 versions -B, -Q. What was different about those

2 productions?

thanks-

Hue Miller