[ARC5] BC-221 question

[Bill Cromwell]

Hi Richard,

I got a PDF copy. Thanks.

73,

Bill  KU8H

On 5/23/20 4:20 PM, Richard Knoppow wrote:
>     I tried to attach a copy of the patent but it was rejected by the 
> list moderator as being too large.
>     For those interested its number 02222043  available from Google 
> Patents or the USPTO site. I think a Google search will find it.
>     It was introduced commercially on the HQ-120-X (X means it has the 
> crystal filter) and shortly after on the Super-Pro. Earlier Super-Pros 
> had crystal filters but they were of a much cruder design.
> 
> On 5/22/2020 6:35 PM, Richard Knoppow wrote:
>> FWIW, Hammarlund had a patented crystal filter.
> 

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