[Boatanchors] query about a collins filter

[WA5CAB at cs.com]

Chris,

I can't right now recall which one, but one of the aircraft nav systems used 
150 CPS (the center frequency of the filter you found) as one of its 
modulating tones.  Perhaps someone will pipe up with which one it was.

In a message dated 2/25/2006 6:50:09 PM Central Standard Time, 
chris at yipyap.com writes: 
> In a pile of stuff:
> 
> ===Collins===
> NO. 673 0280 00
> Band Pass Filter
> Class A  Grade 1
> 142-158 CPS Pass Band
> 0-DC
> 
> With a nice picture of a transformer-coupled
> filter layout on the front.
> 
> 30 VRMS  8000 ohms  on one
> side, 1500 ohms on the other side.
> 
> Ok, why would anyone need a filter for 142-158 hertz?
> 
> Just curious.
> 

Robert Downs - Houston
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