[ARC5] [Milsurplus] BC-221AK Question

[JAMES FALLS]

Yes! The -AK is my favorite of the -221 series. Love it!

Funny anecdote: Mine came to me via a friend who’d stopped at a wide spot on a rural road here in NorCal to relieve himself. He spied it 20’ down the hill (out of range 😛😁). It was the innards, no case. A bit dusty from its trip down the hillside. 

I checked it out and it worked perfectly! Just a scant few PPM off of WWV when enclosed and warmed up. I found a non-battery cabinet and ran it with a separate PSU. I aligned and debugged all my milsurplus radios with it. 😎👍

Jim Falls K6FWT 

> On Aug 27, 2025, at 17:34, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> 
> 
> Hi Ken
> 
> >> The cap is part 9-2, not 0-2 and it is supposed to be 0.001 uF.
> 
> Yes, my typos.   Too lazy to roll over to the bench and get my glasses........     :-)
> 
> <image.png>
> 
> 
> .... and thus the motivation for my question....
> 
> <image.png>
> 
> 
> <image.png>
> 
> 
> The internal HB Power Supply was a "Widow-Maker" Special......with leaky caps!!!
> 
> I will rebuild the PS tomorrow and power it up (after dressing the connections associated with the replacement components.....and using the correct parallel capacitor.
> 
> 73 Mark K3MSB
> 
> 
> 
> 
>> On Wed, Aug 27, 2025 at 7:46 PM Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>> 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
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