[Boatanchors] Wanted: Blackhawk Engineering Passband Filter

[Byron Tatum]

The Heathkit mobile receivers used a 3.0 Mhz crystal filter made by 
Blackhawk Eng. and it reminded me very much (both filter and receiver) of 
the Orr HB article.
    I believe the Heathkit was the HR-20 (mobile SSB set).
                                    CUL, WA5THJ

> Saw a neat construction article in an older Orr Handbook for a
> glow-in-the-dark, homebrew, single conversion 80 - 10 receiver I'm 
> thinking
> of building.  It spec's a Blackhawk Engineering Company bandpass filter in
> the IF.  3 Mc center frequency, 3kc passband if I recall.
>
> Anyone have one?  Something that might work?
>
>