Before I got the Idiom Press board installed, I was using a Science for the
Blind meter reader as the rotor direction indicator. The voltage from the
potentiometer in the rotor is rectified, unfiltered DC. I had a two-section
RC network across the input of the meter reader, and a pot to drop the
voltage down from several volts to a few millivolts. I was measuring the
voltage from ground, which is the wiper of the potentiometer in the rotor,
to the counter-clockwise end of the pot. This is a null-indicating meter
reader, and I set it up so that full clockwise south was at full scale,
north was at about 50% of scale, and CCW south was at 0. I like my new
setup better, but this worked, too.
73,
Lloyd Rasmussen, W3IUU, Kensington, Maryland
Home: http://lras.home.sprynet.com
Work: http://www.loc.gov/nls
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Howard, W A 9 Y B W
> Sent: Thursday, August 18, 2011 12:32 PM
> To: [log in to unmask]
> Subject: Re: Rotor control
>
> Hi Ed,
>
> Would you give me a description on how this circuit works? In other
> words,
> do you compare tones to indicate the position of the meter? Are we
> talking
> about a control box that has an analogue meter? I'm thinking that one
> could
> build a circuit that increases in pitch as a meter needle moves from far
> left to far right and then build fixed tone circuits to indicate the tone
> for north, south, east, west, etc.
> When the tone indicated by the meter position equals, say the south tone,
> then you are pointed south.
>
> Does this make sense?
>
> Howard W A 9 Y B W
>
>
>
> ----- Original Message -----
> From: "Ed Malmgren" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, August 18, 2011 10:48 AM
> Subject: Re: Rotor control
>
>
> > Mark, When I build something I doubt anyone could follow my wireing jobI
> > have modified it a time or two so probably no way. Sorry. 73
> > Ed K7UC
> >
> > --------------------------------------------------
> > From: "mark" <[log in to unmask]>
> > Sent: Thursday, August 18, 2011 9:26 AM
> > To: <[log in to unmask]>
> > Subject: Re: Rotor control
> >
> >> Hi
> >> Any way you could reproduce the diagram or circuit?
> >>
> >> God bless,
> >> Mark
> >>
> >> God Loves you!
> >> You can visit my website at:
> >> http://christiantraditions.info
> >> Please visit my Prayer page at:
> >>
> http://christiantraditions.info/mailman/listinfo/prayerlist_christiantradi
> ti
> >> ons.info
> >>
> >> -----Original Message-----
> >> From: For blind ham radio operators
> >> [mailto:[log in to unmask]]
> >> On Behalf Of Ed Malmgren
> >> Sent: Thursday, August 18, 2011 8:08 AM
> >> To: [log in to unmask]
> >> Subject: Rotor control
> >>
> >> Keith, I use a circuit that I got the schematic from the Braille Tech
> >> Press
> >>
> >> way back about 1961. It is a comparator circuit and goes across a Ham
> 4
> >> control box meter. It looks crappy but has worked since. Wish I still
> >> had
> >> that book with the circuit. 73 Ed K7UC
|
