[ARC5] BC-221 question

[Richard Knoppow]

    The crystals are in cans like metal tubes. I don't know the 
type as far as the crystal cut. I also have a BC-221A/K and use 
it. The A/K is the one with a modulator and an AC supply stuck in 
the battery compartment. The cabinet is supposed to be sealed but 
getting the crystal on frequency is a PITA unless you drill a 
hole to access the trimmer from outside. Before you do any 
drilling make sure there is not something in the way. I think 
there is on mine would have to open it up and look.
     The key to the BC-221 and the similar LM is having the 
calibration booklet. Its possible to make one with a modern 
counter but its a tedious project. I saw an article (and may even 
have it) on how the calibration charts were generated originally.

On 5/22/2020 4:31 PM, Kenneth G. Gordon wrote:
> On 22 May 2020 at 23:19, Hubert Miller wrote:
>
>> I do not have a BC-221, so can someone remind me, this crystal frequency and package
> type?
>
> I have, and use, two BC-221-AKs. Both have 1 MHz crystals in them. I can't remember the
> type.
>
> Ken W7EKB
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL