[Boatanchors] query about a collins filter

[Glenn Little WB4UIV]

150 Hz and 90 Hz are used with ILS. See 
<http://www.maltastar.com/pages/msDossierDetailN.asp?id=7406&po=6>

75
Glenn
WB4UIV

At 09:18 PM 02/25/06, WA5CAB at cs.com wrote:
>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
><http://www.wa5cab.com> (Web Store)
>MVPA 9480
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