[ARC5] [Milsurplus] BC-221AK Question

[kgordon2006]

I really like my -AKs too. I find them to be unusually accurate and stable for bring 70 years old.Ken W7EKBSent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
-------- Original message --------From: JAMES FALLS <radio-tuber at att.net> Date: 8/27/25  18:40  (GMT-08:00) To: Mark K3MSB <mark.k3msb at gmail.com> Cc: Ken Gordon <kgordon2006 at frontier.com>, ARC5 <ARC5 at mailman.qth.net>, List Milsurplus <milsurplus at mailman.qth.net> Subject: Re: [ARC5] [Milsurplus] BC-221AK Question 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 K3MSBOn 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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