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Re: ARS rotor controller and the HD-73 rotor



Freeman,
 you can increase the output voltage of  HD-73 from 0.71 V to 5 Volts by
using a homebrew
OP-Amp stage with x7 multiplier (7 x 0.71 = 4.97 Volts). Thus, the input of
Op-amp takes a voltage range 0 - 0.71 Volts and the
output of this stage giving 0-5 Volts. If you don't know how to design
something like that, let me know.

 73, Mak SV1BSX

----- Original Message -----
From: "Freeman P. Pascal IV" <pascal@pascal.org>
To: "amsat-bb" <amsat-bb@AMSAT.Org>
Sent: Saturday, June 19, 2004 7:30 AM
Subject: [amsat-bb] ARS rotor controller and the HD-73 rotor


> Are there any list members who are using the ARS RCX AZ/EL boards with
> an Alliance HD-73 rotor or any rotor that return less than 5V at max
> range?
>
> My HD-73 only provides 0.71 volts at max range.  This is well below the
> needed 5V for returning a value of 255 from the 8 bit ADC.  The best I
> can get is a max value of 36.  ARSWIN complains this is way to low for
> use.
>
> If anyone has an HD-73, could I trouble them to send me the voltage they
> read at full range between terminal #6 on the back of the control unit
> and the case?
>
> Does anyone now how to resolve this problem?  I have v3.2 of the RCX-AZ
> board.  The older RCX boards had P3 and P4 which allowed adjusting the
> voltage up.  The board I have has a jumper across P3.  I suspect I need
> to insert an appropriate value here.
>
>
> -Freeman, N5FPP
>
>
>
> ----
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