Re: TI-H: What we need to concentrate on with the RF

Subject: Re: TI-H: What we need to concentrate on with the RF
From: Bendzick <bendzick@millcomm.com>
Date: Fri, 08 Nov 1996 22:19:12 -0600
In-Reply-To: <TI-H: What we need to concentrate on with the RF>

Jason C. Wenger wrote:
> 
> >>>Ok here are some things we should stick to with the RF (whatever that
> >>>stands for) link, here is what we need to concentrate on):
> >>>
> >>>1. Lets stop talking about the IR link, it's not as affective as the
> RF link.
> >>>2. A two calc radio connection (not 3 or more)
> >>>3. The user should be able to change the frequency, no making 2
> different >>>links, that's a waste.
> >>
> >> [SNIP]
> >>
> >> Right-- multifrequency.  But let's not use potentiometers, but 20
> >> position rotary switches or something like that...  That way no need
> to
> >> fine-fune.  (like CB, not radio-- channels instead of frequencies.)
> >
> >No, not multi-frequency. For every posiotion, you add cost. Every switch
> is
> >like a separate RF transmitter/receiver. So a 20 position switcher is
> gonna
> >cost 20x more than a 1 position one.
> 
> Okay... I don't know too much about electronics so I'm probably wrong...
> but here's my idea...  You use a R-C circuit to determine the operating
> frequency, right?  Well, if you use a potentiometer instead of a fixed
> resistor, you cna control the frequency.  if, however you nad a
> multi-position switch and connected resistors from one lead to antother,
> the resistance would change by even anounts when you changed positions...
> Here's a drawing (5-channel).  It should be a radial switch, but I drew
> it linear 'cuz its ASCII.
> 
>    ### means a resistor.
> 
>             50k     10k   10k   10k   10k
> in  +-------###---+-###-+-###-+-###-+-###-+
>                   |     |     |     |     |
>                   1     2     3     4     5
>                               |
>                               | <- movable contact
> out +-------------------------+---------------
> 
> I don't know about the resistor values... this is just an idea.
> 
> Jason "Thursday" Wenger
> jwenger@juno.com
> Illegitimi no carborundum
Give me a schematic for a simple FM band receiver (88-108 mhz), and I
will make a link given enough time.  I know how to use frequency to lend
channel capability to the data, change frequency, and MAKE IT USER
FRIENDLY!


-Michael Bendzick (Calcbert)
bendzick@millcomm.com

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