On 27 Aug 2025 at 18:56, Mark K3MSB wrote:

> I have a BC-221 whose ID plate says  BC-221E.   It is not an E

> variant.

> From the tubes, front panel controls, and TM11-300,  I think it's the

> AK variant.

I have two -AKs here: unfortunately. in storage, not in the shack. :-(

> Looking at the front panel,  what is supposed to be behind the two

> antenna connectors?

Well, only ONE is an antenna connector: the "other" one is a ground connector...or should be.

> I tried discerning it from TM11-300.   I think it's supposed to be a

> 150 H Choke (Part 24) in parallel

> with a 0.01 uF cap (Part 0-2).

The cap is part 9-2, not 0-2 and it is supposed to be 0.001 uF.

>    Can anyone confirm?

Well, a 150 H choke would be physically fairly large for a "small" choke. I would have to go to my storage building and open one of my -AKs up to check, and cannot do that just now.

I hope Wayne can help. If all else fails, I'll make a run to my storage and take look as soon as I can.

BTW, the -AK version is one of only two other versons which include AF modulation capability. None of the others have that. This makes the -AK a fully functioning signal generstor.

Ken W7EKB