RE: TI-H: Okay I maybe overreacted
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RE: TI-H: Okay I maybe overreacted
At the powers (mwatts) that you will be operating, The
regulations you quoted are not in affect. Ask any ham operator
and they can tell you the max signal strength am guessing 10
milo-watts The only restriction to these milo-watt Tx devices is
that they may not interfere with commercial broadcast. This can
basically be overcome by a good clean signal.
This regulation came from devices such as garage door openers
that were cheaply made and TX over a broad band for
dependability.
On Sunday, October 05, 1997 1:56 AM, Leif Gregory
[SMTP:ldgregory@biogate.com] wrote:
> At 09:32 PM 10/4/97 -0800, you wrote:
>
> :x-------------------- SNIP -------------------x:
>
> The main problem with any RF-link is the feedback we get for
> having a
> transmitter right next to a reciever while both are working.
We
> need to
> eliminate almost ALL noise emissions to get it to work without
> errors.
> >>
> >> -=<Matt>=-
> >>
>
> :x-------------------- SNIP -------------------x:
>
> Error correcting is going to be a pain. I don't know too much
> software, but
> is there any way to maybe mask in software the TX. i.e.
>
> the calc sends
>
> 101010101011010101010111
>
> take a copy of that and use it to filter out the sequence in
> the RX side.
>
> The problem I see with it, is that you may not RX this exact
> bitstream,
> because of spurious noise, interference from other calcs TX
> etc..
>
> I know, here comes the groans, but we are neglecting one more
> important
> aspect. The legal side. FCC 47 CFR 15.122 states that "... the
> duration of
> each transmission shall not be greater than one second and the
> silent
> period between transmissions shall be at least 30 times the
> transmission
> duration but in no case less than 10 seconds." This is in
> reference to
> private projects transmitting up to 100 feet. This is from a
> Radio Shack
> book, so if anybody has the actual URL where I could find
this,
> I would be
> greatly appreciative. There is also rules governing signal
> strengths. I
> know the way they measure this is to place it on a bench, and
> they measure
> the signal strength at certain distances around the TXing
> device. I'm not
> trying to be a wet blanket. You do with this info as you will.
> I just don't
> believe in ignorance.
>
> :)
>
>
>
>
>
> Leif
>
> - zldgregory@biogate.com
> Dedicated to providing you with more
> information than you needed to know.
>
> To email me, remove the z in my address -